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SnO_2-based solid solutions for CH_4 deep oxidation: Quantifying the lattice capacity of SnO_2 using an X-ray diffraction extrapolation method 认领 引用 被引量：1
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作者 孙琪 徐香兰 +5 位作者 彭洪根 方修忠 刘文明 应家伟 余帆 王翔 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第8期1293-1302,共10页
A series of SnO2‐based catalysts modified by Mn, Zr, Ti and Pb oxides with a Sn/M （M=Mn, Zr, Ti and Pb） molar ratio of 9/1 were prepared by a co‐precipitation method and used for CH4 and CO oxidation. The Mn3＋, ... A series of SnO2‐based catalysts modified by Mn, Zr, Ti and Pb oxides with a Sn/M （M=Mn, Zr, Ti and Pb） molar ratio of 9/1 were prepared by a co‐precipitation method and used for CH4 and CO oxidation. The Mn3＋, Zr4＋, Ti4＋and Pb4＋cations are incorporated into the lattice of tetragonal rutile SnO2 to form a solid solution structure. As a consequence, the surface area and thermal stability of the catalysts are improved. Moreover, the oxygen species of the modified catalysts become easier to be reduced. Therefore, the oxidation activity over the catalysts was improved, except for the one modified by Pb oxide. Manganese oxide demonstrates the best promotional effects for SnO2. Using an X‐ray diffraction extrapolation method, the lattice capacity of SnO2 for Mn2O3 was 0.135 g Mn2O3/g SnO2, which indicates that to form stable solid solution, only 21%Sn4＋cations in the lattice can be maximally replaced by Mn3＋. If the amount of Mn3＋cations is over the capacity, Mn2O3 will be formed, which is not favorable for the activity of the catalysts. The Sn rich samples with only Sn‐Mn solid solution phase show higher activity than the ones with excess Mn2O3 species. 展开更多
关键词 SnO2-based solid solution X-ray diffraction extrapolation method Lattice capacity Methane deep oxidation Carbon monoxide oxidation
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Three-dimensionally ordered macroporous SnO_2-based solid solution catalysts for effective soot oxidation 认领 引用 被引量：3
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作者 Cheng Rao Rui Liu +6 位作者 Xiaohui Feng Jiating Shen Honggen Peng Xianglan Xu Xiuzhong Fang Jianjun Liu Xiang Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第10期1683-1694,共12页
A series of three‐dimensionally ordered macroporous(3DOM)SnO2‐based catalysts modified by the cations Ce4+,Mn3+,and Cu2+have been prepared by using a colloidal crystal templating method and tested for soot combustio... A series of three‐dimensionally ordered macroporous(3DOM)SnO2‐based catalysts modified by the cations Ce4+,Mn3+,and Cu2+have been prepared by using a colloidal crystal templating method and tested for soot combustion under loose contact condition.XRD and STEM mapping results confirm that all the secondary metal cations have entered the lattice matrix of tetragonal rutile SnO2 to form non‐continuous solid solutions,thus impeding crystallization and improving the surface areas and pore volumes of the modified catalysts.In comparison with regular SnO2 nanoparticles,the 3DOM SnO2 displays evidently improved activity,testifying that the formation of the 3DOM structure can anchor the soot particulates in the macro‐pores,which ensures that the contact of the soot particles with the active sites on the 3DOM skeleton is more easily formed,thus benefiting the target reaction.With the incorporation of the secondary metal cations,the activity of the catalyst can be further improved due to the formation of more abundant mobile oxygen species.In summary,these effects are believed to be the major factors responsible for the activity of the catalyst. 展开更多
关键词 Three‐dimensionally ordered macroporous catalyst Soot combustion SnO2 solid solution Lattice doping Oxygen vacancies
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Investigation of lattice capacity effect on Cu2+-doped SnO2 solid solution catalysts to promote reaction performance toward NOx-SCR with NH3 认领 引用 被引量：1
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作者 Xianglan Xu Yunyan Tong +7 位作者 Jingyan Zhang Xiuzhong Fang Junwei Xu Fuyan Liu Jianjun Liu Wei Zhong Olga ELebedeva Xiang Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第5期877-888,共12页
To understand the effect of the doping amount of Cu^2+ on the structure and reactivity of SnO2 in NOx-SCR with NH3, a series of Sn-Cu-O binary oxide catalysts with different Sn/Cu ratios have been prepared and thoroug... To understand the effect of the doping amount of Cu^2+ on the structure and reactivity of SnO2 in NOx-SCR with NH3, a series of Sn-Cu-O binary oxide catalysts with different Sn/Cu ratios have been prepared and thoroughly characterized. Using the XRD extrapolation method, the SnO2 lattice capacity for Cu^2+ cations is determined at 0.10 g Cu O per g of SnO2, equaling a Sn/Cu molar ratio of 84/16. Therefore, in a tetragonal rutile SnO2 lattice, only a maximum of 16% of the Sn4+ cations can be replaced by Cu^2+ to form a stable solid solution structure. If the Cu content is higher, Cu O will form on the catalyst surface, which has a negative effect on the reaction performance. For samples in a pure solid solution phase, the number of surface defects increase with increasing Cu content until it reaches the lattice capacity, as confirmed by Raman spectroscopy. As a result, the amounts of both active oxygen species and acidic sites on the surface, which critically determine the reaction performance, also increase and reach the maximum level for the catalyst with a Cu content close to the lattice capacity. A distinct lattice capacity threshold effect on the structure and reactivity of Sn-Cu binary oxide catalysts has been observed. A Sn-Cu catalyst with the best reaction performance can be obtained by doping the SnO2 matrix with the lattice capacity amount of Cu^2+. 展开更多
关键词 SnO2-based solid solution Lattice capacity of Cu^2+ XRD extrapolation method NOx-SCR with NH3 Threshold effect
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Preparation and Characterization of CeO_2-ZrO_2 Solid Solution Ultrafine Particles Using Reversed Microemulsion 认领 引用 被引量：5
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作者 安源 李丽 +1 位作者 王军 沈美庆 《Journal of Rare Earths》 SCIE EI CAS 2005年第4期416-419,共4页
Ce0.6Zr0.4O2 solid solution ultrafine particle was prepared in the cyclohexane/water/OP-10-hexanol reversed microemulsion. The quasi-ternary phase diagram investigations showed that the system has narrow W/O type micr... Ce0.6Zr0.4O2 solid solution ultrafine particle was prepared in the cyclohexane/water/OP-10-hexanol reversed microemulsion. The quasi-ternary phase diagram investigations showed that the system has narrow W/O type microemulison region, so it is the proper system to prepare Ce0.6Zr0.4O2 solid solution ultrafine particle. Some physical-chemical techniques such as TG/DTA, XRD, BET, and HRTEM are used to characterize the resultant powders. The results show that the fluorite cubic Ce0.6Zr0.4O2 solid solution is obtained at 400 ℃. The surface area is （146.7 m^2·g^-1）, which is higher than the surface area for sol-gel prepared sample （59.5m^2·g^-1）. HRTEM images indicated that the Ce0.6Zr0.4O2 solid solution ultrafine particle is well-crystallized, narrow size distribution, less agglomeration, within mean size of 5 -7 nm. 展开更多
关键词 reverse microemulsion CeO2-ZrO2 solid solution ultrafine particle rare earths
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Effect of water vapor on the CO and CH_4 catalytic oxidation over CeO_2-MO_x (M=Cu, Mn, Fe, Co, and Ni) mixed oxide 认领 引用 被引量：14
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作者 乔东升 卢冠忠 +2 位作者 郭耘 王艳芹 郭杨龙 《Journal of Rare Earths》 SCIE EI CAS 2010年第5期742-746,共5页
CeO2-MOx (M=Cu, Mn, Fe, Co, and Ni) mixed oxide catalysts were prepared by a citric acid complexation-combustion method. CeO2-MOx solid solutions could be formed with M cations doping into CeO2 lattice, while NiO and ... CeO2-MOx (M=Cu, Mn, Fe, Co, and Ni) mixed oxide catalysts were prepared by a citric acid complexation-combustion method. CeO2-MOx solid solutions could be formed with M cations doping into CeO2 lattice, while NiO and Co3O4 phases were detected on the surface of CeO2-NiO and CeO2-Co3O4 by Raman spectroscopy. The presence of M in CeO2 could obviously promote its catalytic activity for CH4 catalytic combustion and CO oxidation. Among the prepared samples, CeO2-CuO exhibited the best performance for CO oxidatio... 展开更多
关键词 CeO2-MOx solid solution catalytic oxidation methane combustion CO oxidation effect of water vapor rare earths
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Catalytic reduction of SO_2 by CO over CeO_2-TiO_2 mixed oxides 认领 引用 被引量：8
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作者 张丽 秦毅红 +3 位作者 陈白珍 彭亚光 何汉兵 袁依 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第11期2960-2965,共6页
The structure and catalytic desulfurization characteristics of CeO2-TiO2 mixed oxides were investigated by means ofX-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and catalytic activity tests. Acco... The structure and catalytic desulfurization characteristics of CeO2-TiO2 mixed oxides were investigated by means ofX-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and catalytic activity tests. According to the results, a CeO2-TiO2solid solution is formed when the mole ratio of cerium to titanium n（Ce）：n（Ti） is 5：5 or greater, and the most suitable n（Ce）：n（Ti） isdetermined as 7：3, over which the conversion rate of SO2 and the yield of sulfur at 500℃ reach 93% and 99%, respectively.According to the activity testing curve, Ce0.7Ti0.3O2 （n（Ce）：n（Ti）=7：3） without any pretreatment can be gradually activated by reagentgas after about 10 min, and reaches a steady activation status 60 min later. The XPS results of Ce0.7Ti0.3O2 after different time ofSO2＋CO reaction show that CeO2 is the active component that offers the redox couple Ce4＋/Ce3＋ and the labile oxygen vacancies, andTiO2 only functions as a catalyst structure stabilizer during the catalytic reaction process. After 48 h of catalytic reaction at 500℃,Ce0.7Ti0.3O2 still maintains a stable structure without being vulcanized, demonstrating its good anti-sulfur poisoning performance. 展开更多
关键词 CeO2-TiO2 mixed oxides solid solution catalytic reduction carbon monoxide sulfur dioxide
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A rationale for the development of thermally stable nanostructured CeO_2-ZrO_2-containing mixed oxides 认领 引用 被引量：10
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作者 Roberta Di Monte Jan Kapar +1 位作者 Heather Bradshaw Colin Norman 《Journal of Rare Earths》 SCIE EI CAS 2008年第2期136-140,共5页
CeO2-ZeO2 solid solutions are extensively used as oxygen storage promoters in the current automotive three-way catalysts. High thermal stability of the textural properties is one of the most important requirements for... CeO2-ZeO2 solid solutions are extensively used as oxygen storage promoters in the current automotive three-way catalysts. High thermal stability of the textural properties is one of the most important requirements for practical application since temperatures up to 1273 K are easily experienced by these materials under real working conditions. In the present paper, we investigated how hydrothermal treatments applied to cakes of doped and undoped ZrO2-rich CeO2-ZrO2 precursors might improve the thermal stability of the final CeO2-ZrO2 solid solution. A rationale was developed that allowed to correlate the morphology of the hydrothermaUy treated cake with the thermal stability at 1273 K of the final product, which did not depend on the composition of the mixed oxides. 展开更多
关键词 CeO2-ZrO2 mixed oxides CeO2-ZrO2 solid solution CeO2-ZrO2 mixed oxides, thermal stability of three-way catalysts oxygen storage capacity rare earths
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Structures and oxygen storage capacities of CeO_2-ZrO_2-Al_2O_3 ternary oxides prepared by a green route:supercritical anti-solvent precipitation 认领 引用 被引量：9
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作者 黄盼 姜浩锡 张敏华 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第6期524-528,共5页
CeO2-ZrO2-Al2O3 ternary oxides were successfully prepared by a green route of supercritical anti-solvent precipitation with supercritical CO2 as anti-solvent and methanol as solvent. The structures and oxygen storage ... CeO2-ZrO2-Al2O3 ternary oxides were successfully prepared by a green route of supercritical anti-solvent precipitation with supercritical CO2 as anti-solvent and methanol as solvent. The structures and oxygen storage capacities of these ternary oxides were characterized by XRD, Raman spectra and oxygen storage capacity measurements. It was found that Al3＋ and Zr4＋ inserted into CeO2 lattice, forming CeO2-ZrO2-Al2O3 solid solution. The concentration of aluminium isopropoxide in the solution affected the concentration of oxygen vacancy and the distortion of oxygen sublattice which were responsible for the oxygen storage capacity. The rapidest oxygen uptakeelease rate and maximum total oxygen storage capacity （122.0 mmolO2/molCeO2） were obtained with the aluminitun isopropoxide concentration at 0.2 wt.% in the solution. 展开更多
关键词 CeO2-ZrO2-Al2O3 solid solution supercritical anti-solvent precipitation oxygen storage capacity rare earths
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Activity and hydrothermal stability of CeO_2–ZrO_2–WO_3 for the selective catalytic reduction of NO_x with NH_3 认领 引用 被引量：7
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作者 Zhongxian Song Ping Ning +5 位作者 Qiulin Zhang Hao Li Jinhui Zhang Yancai Wang Xin Liu Zhenzhen Huang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第4期168-177,共10页
A series of CeO2–ZrO2–WO3（CZW）catalysts prepared by a hydrothermal synthesis method showed excellent catalytic activity for selective catalytic reduction（SCR）of NO with NH3 over a wide temperature of 150–550℃.... A series of CeO2–ZrO2–WO3（CZW）catalysts prepared by a hydrothermal synthesis method showed excellent catalytic activity for selective catalytic reduction（SCR）of NO with NH3 over a wide temperature of 150–550℃.The effect of hydrothermal treatment of CZW catalysts on SCR activity was investigated in the presence of 10% H2O.The fresh catalyst showed above 90% NOx conversion at 201–459℃,which is applicable to diesel exhaust NOx purification（200–440℃）.The SCR activity results indicated that hydrothermal aging decreased the SCR activity of CZW at low temperatures（below 300℃）,while the activity was notably enhanced at high temperature（above 450℃）.The aged CZW catalyst（hydrothermal aging at 700℃ for 8 hr）showed almost 80% NOx conversion at 229–550℃,while the V2O5–WO3/TiO2 catalyst presented above 80% NOx conversion at 308–370℃.The effect of structural changes,acidity,and redox properties of CZW on the SCR activity was investigated.The results indicated that the excellent hydrothermal stability of CZW was mainly due to the CeO2–ZrO2 solid solution,amorphous WO3 phase and optimal acidity.In addition,the formation of WO3 clusters increased in size as the hydrothermal aging temperature increased,resulting in the collapse of structure,which could further affect the acidity and redox properties. 展开更多
关键词 CeO2–ZrO2–WO3 Hydrothermal stability Solid solution Acidity
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Catalytic oxidation of CO on mesoporous codoped ceria catalysts:Insights into correlation of physicochemical property and catalytic activity 认领 引用 被引量：6
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作者 Hongjian Zhu Yingying Chen +5 位作者 Yibo Gao Wenxu Liu Zhongpeng Wang Chenchen Cui Wei Liu Liguo Wang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第9期961-969,I0003,共9页
Codoping approach is an appealing strategy to further improve the catalytic activity of Ce-based catalysts.In the present study,Mn and/or Cu doped ceria solid solutions MnxCuyCe1-x-yO2,CuxCe1-xO2,MnxCe1-xO2 and pure C... Codoping approach is an appealing strategy to further improve the catalytic activity of Ce-based catalysts.In the present study,Mn and/or Cu doped ceria solid solutions MnxCuyCe1-x-yO2,CuxCe1-xO2,MnxCe1-xO2 and pure CeO2 were prepared by CTAB-assisted hydrothermal method for CO oxidation.XRD,SEM,EDS,BET,Raman,H2-TPR,XPS and in situ DRIFTS techniques were carried out to study the physicochemical properties and to correlate them to the activity.The doped samples maintain the cubic fluorite structure of CeO2 with high crystallinity and small crystallite size,forming Ce-based solid solutions.The obtained catalysts have large mesoporous structure with average pore size of 10-14 nm.The doped transition metal enhances the oxygen vacancies and improves reducibility of the solids.The synergistic interaction of Mn and Cu codoping induces mo re oxygen vacancies,pro moting the increase of surface adsorbed oxygen and the transfer of bulk oxygen of catalyst,thereby enhancing the catalytic activity for CO oxidation.Besides,the decomposition rate of the carbonate species which is derived from in situ DRIFTS for each catalyst can provide a measure to evaluate its catalytic activity of CO oxidation. 展开更多
关键词 CeO2 Codoping Solid solution Mesoporous CO oxidation Rare earths
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CeO_2基固体电解质材料的掺杂强化 认领 引用
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作者 梁广川 梁秀红 林舜旺 《天津城市建设学院学报》 2002年第3期156-159,共4页
强度低是 Ce O2 基电解质材料的一个主要缺点 .实验发现 ,加入 Al2 O3可以显著增加Ce O2 基材料的强度 ,原因是掺杂的 Al2 O3在 Ce O2 中产生压缩应力 ,阻碍裂纹的进一步扩展 ,另外 ,Al2 O3分布在晶界处 ,将会导致裂纹偏转 .最大弯曲强... 强度低是 Ce O2 基电解质材料的一个主要缺点 .实验发现 ,加入 Al2 O3可以显著增加Ce O2 基材料的强度 ,原因是掺杂的 Al2 O3在 Ce O2 中产生压缩应力 ,阻碍裂纹的进一步扩展 ,另外 ,Al2 O3分布在晶界处 ,将会导致裂纹偏转 .最大弯曲强度对应的 Al2 O3添加剂量摩尔分数为 3% .加入 Al2 O3还可以促进材料烧结 ,使烧结温度降低到 15 0 0℃以下 ,但会使Ce O2 展开更多
关键词 CeO2 固体电解质 掺杂 Al2O3 强度
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固体氧化物燃料电池用CeO2基电解质的研究进展 认领 引用 被引量：11
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作者 刘润泽 周芬 +3 位作者 王青春 郜建全 包金小 宋希文 《材料导报》 EI CAS CSCD 北大核心 2021年第S1期29-32,41,共4页
作为一种高效的能源转换装置,固体氧化物燃料电池(SOFC)因具有高效率、环境友好和燃料灵活等优点受到广泛关注。电解质作为SOFC的核心部分,其性能的好坏直接决定SOFC的性能。SOFC使用的传统电解质材料是部分氧化钇稳定的氧化锆(YSZ),但... 作为一种高效的能源转换装置,固体氧化物燃料电池(SOFC)因具有高效率、环境友好和燃料灵活等优点受到广泛关注。电解质作为SOFC的核心部分,其性能的好坏直接决定SOFC的性能。SOFC使用的传统电解质材料是部分氧化钇稳定的氧化锆(YSZ),但因其工作温度高(约1000℃),由此带来电极材料的选择、密封等诸多困难。因此,开发适用于中低温下的电解质对推进SOFC的商业化进程至关重要。单元素掺杂的氧化铈基电解质在中低温下的电导率高于同温度下YSZ的电导率。然而,CeO2基电解质也存在以下不足:在低氧分压下,部分Ce4+被还原为Ce3+而产生电子电导;在中低温度下,晶界电阻较大而使总电导率降低。影响CeO2基电解质电导率的因素较多,如粉体的制备方法、烧结体的微观形貌、掺杂剂的种类和浓度。其中,较为重要的影响因素是掺杂剂的种类及其浓度、粉体的制备方法。针对以上问题,研究人员普遍认为,相比于单掺杂CeO2,元素共掺或多掺(尤其掺杂稀土元素)更有利于改善电解质的离子电导率,并降低电子电导率。掺杂元素的种类通常包括:稀土元素和部分碱土金属元素。除元素掺杂外,不同碳酸盐复合的CeO2基电解质也引起了研究人员的兴趣。在制备方法上,采用微波烧结、多元醇法、静电纺丝等不同粉体制备方法可得到高离子电导率的电解质,此外,将电解质薄膜化或采用脉冲激光沉积(PLD)在CeO2电解质基底上沉积一层隔膜都可以降低电子电导,提高电导率。本文结合最近几年学者们对CeO2基电解质的研究状况,简述了元素掺杂、粉体的制备方法以及电解质薄膜对CeO2基电解质电性能的影响,并对其发展进行了展望。 展开更多
关键词 固体氧化物燃料电池 掺杂CeO2 元素掺杂 粉体制备方法 离子电导率
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Ni2+掺杂Cd0.5Zn0.5S固溶体制备及可见光分解水制氢研究 认领 引用 被引量：2
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作者 吴琛 赵宝军 +4 位作者 王俊 谭鹏 谢志文 徐俊英 彭绍琴 《有色金属（冶炼部分）》 CAS 北大核心 2021年第10期66-70,共5页
采用水热法制备了Cd0.5Zn0.5S和Ni 2+掺杂Ni(m)/Cd0.5Zn0.5S固溶体光催化剂。通过XRD、UV-Vis漫反射光谱和电化学方法表征了催化剂的结构和光电性能,并考查了固溶体在以三乙醇胺为电子给体、可见光(λ≥420nm)照射下光... 采用水热法制备了Cd0.5Zn0.5S和Ni 2+掺杂Ni(m)/Cd0.5Zn0.5S固溶体光催化剂。通过XRD、UV-Vis漫反射光谱和电化学方法表征了催化剂的结构和光电性能,并考查了固溶体在以三乙醇胺为电子给体、可见光(λ≥420nm)照射下光催化分解水制氢活性。结果表明,Ni 2+掺杂后提高了催化剂对可见光的吸收,促进了光生电子-空穴的有效分离,有效提高了Cd0.5Zn0.5S固溶体的光催化制氢活性。当Ni 2+的掺杂量为5%(摩尔百分数),反应体系NaOH浓度为0.5mol/L时,催化剂活性最高,Ni(5)/Cd0.5Zn0.5S制氢活性为纯Cd0.5Zn0.5S固溶体的5倍。催化剂经15h反应具有良好的稳定性。 展开更多
关键词 Cd0.5Zn0.5S固溶体 Ni2+掺杂 光催化 制氢
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High-pressure synthesis and properties of CeO_2-ZrO_2 solid solution 认领 引用
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作者 XU Dapeng, WANG Quanyong, LU Zhe, LIU Zhiguo, ZHANG Gongmu & SU Wenhui1. Department of Physics, Jilin University, Changchun 130023 China 2. International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015, China 3. Center for Condensed Matter and Radiation Physics, China Center of Advanced Science and Technology , Beijing 100080, China 《Chinese Science Bulletin》 2001年第10期801-806,共6页
Using nanoparticles of CeO2 and ZrO2 prepared by the chemical precipitation method as starting materials, the single-phase cubic Ce0.5Zr0.5O2 solid solution (c-Ce0.5Z0.5O2) has been synthesized under 3.1 GPa at 1073 K... Using nanoparticles of CeO2 and ZrO2 prepared by the chemical precipitation method as starting materials, the single-phase cubic Ce0.5Zr0.5O2 solid solution (c-Ce0.5Z0.5O2) has been synthesized under 3.1 GPa at 1073 K for the first time. The structure of the c-Ce0.5Zr0.5O2 has not been changed before and after annealing at 773 K for 1 h. Only an unknown EPR signal (g =1.990) has been observed in the c-Ce0.5Zr0.5O2 and not varied after annealing at 773 K for 1 h, which exhibited that there exists no Ce3+ in the c-Ce0.5Zr0.5O2 and the Ce4+ has not been reduced into Ce3+ after annealing. The transport mechanism is ionic for the c-Ce0.5Zr0.5O2. The bulk conductivity (a =1.2×10-5 S/cm at 823 K, σ=2.1 ×10-3 S/cm at 1123 K) is the same as that of CeO2, but smaller than that of Y2O3-stabilized ZrO2. A marked curvature at T = 823 K has been observed in the Arrhenius plot of the bulk conductivity. The activation energy below 823 K is lower than that above 823 K, and the reason has been discussed. 展开更多
关键词 CeO2-ZrO2 nanocrystalline high-pressure and -temperature solid-state reaction solid solution.
Mn incorporated RuO2 nanocrystals as an efficient and stable bifunctional electrocatalyst for oxygen evolution reaction and hydrogen evolution reaction in acid and alkaline 认领 引用 被引量：2
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作者 Jing Cao Dezheng Zhang +2 位作者 Bianqing Ren Ping Song Weilin Xu 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第10期194-200,共7页
The development of efficient and stable bifunctional overall water-splitting is a crucial goal for clean and renewable energy,which is a challenging task.Herein,we report an Mn-incorporated RuO2(MnRuO2)catalyst ... The development of efficient and stable bifunctional overall water-splitting is a crucial goal for clean and renewable energy,which is a challenging task.Herein,we report an Mn-incorporated RuO2(MnRuO2)catalyst for highly efficient electrocatalytic oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)in acid and alkaline media.Benefiting from a more electrochemical active area with the incorporation of Mn,the Mn-RuO2required an overpotential of 200 mV to attain a current density of 10 mA/cm2for OER in acid.DFT result indicates that the doping of Mn into RuO2can enhance the OER activity.An acidic overall water-splitting electrolyzer with good stability constructed by bifunctional Mn-RuO2only requires a cell voltage of 1.50 V to afford 10 m A/cm2and can operate stably for 50 h at50 mA/cm2,which is better than the state-of-the-art Ru-based catalyst.Additionally,the Mn-Ru O2exhibits excellent HER and OER activity in alkaline media,and it shows superior activity and durability for overall water-splitting,only needing a cell voltage of 1.49 V to attain 10 m A/cm2.The present work provides an efficient approach to designing and constructing efficient Ru-based electrocatalysts for overall water-splitting. 展开更多
关键词 RuO2-based solid solution electrocatalysts Oxygenevolution reaction Hydrogen evolution reaction Overall watersplitting Acid andalkaline
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纳米Ce1-4x(FeAlCoLa)xO2-δ固溶体微观光谱特征及氧化还原性能研究 认领 引用 被引量：1
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作者 孙世龙 张国芳 +5 位作者 束俊 郭瑞华 李一鸣 刘卓承 许剑轶 葛启录 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2024年第7期1883-1888,共6页
采用水热法合成Fe3+、Al3+、Co2+及La3+共掺杂纳米Ce1-4x(FeAlCoLa)xO2-δ(x=0.00~0.05)固溶体,利用X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、紫外吸收光谱(UV)、荧光光谱(PL)、拉曼光谱(Raman... 采用水热法合成Fe3+、Al3+、Co2+及La3+共掺杂纳米Ce1-4x(FeAlCoLa)xO2-δ(x=0.00~0.05)固溶体,利用X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、紫外吸收光谱(UV)、荧光光谱(PL)、拉曼光谱(Raman)以及与H2的程序升温还原反应(TPR)等方法对固溶体的微观结构、形貌、光谱特征和氧化还原活性进行系统表征及分析。XRD结果表明,Ce1-4x(FeAlCoLa)xO2-δ固溶体均呈CeO2立方萤石结构,当掺杂量增加到x=0.04时,在36.6°处出现了微弱的Co3O4杂相,可以确定掺杂离子在CeO2晶格中的固溶度x<0.04。样品的(111)衍射峰位向高角度偏移,表明掺杂离子引起晶格发生畸变。TEM及SEM结果显示样品为球形纳米颗粒,掺杂离子引起晶面间距变小。紫外吸收光谱表明,与纯CeO2相比,掺杂样品的吸收边逐渐红移,在560~780 nm范围观察到掺杂离子的紫外吸收峰。掺杂引起样品能隙降低,从2.84 eV(纯CeO2)逐渐降低至2.10 eV(x=0.05)。其原因可归结为掺杂离子在CeO2的价带和导带之间形成新的杂质能级,允许电子从价带跃迁到较低的杂质能级上,继而降低了跃迁能隙。由于掺杂离子引起晶格内部发生畸变以及氧空位比例增大,阻碍了电子的高能跃迁,也可引起能隙减小。荧光光谱证明,掺杂样品的发射峰强度明显降低。Raman光谱表明,掺杂引起F2g峰位发生偏移,峰强减小,峰宽变大。同时,对应于氧空位峰的相对强度逐渐提高。荧光光谱及Raman光谱均证明掺杂离子引起固溶体晶格畸变程度增加,氧空位浓度提高。H2-TPR测试表明,掺杂可以有效降低CeO2的氧化还原反应温度,提高氧化还原活性,当x=0.03的样品表面还原温度最低,还原峰的面积最大,即氧化还原反应活性最佳,表明样品的氧化还原性能与晶粒尺寸、晶格缺陷及氧空位浓度密切相关。通过以上研究证明,四种离子共掺杂CeO2能够有效修饰微观晶体结构,在较低掺杂浓度下即可显著改善样品的催化活性。 展开更多
关键词 纳米Ce1-4x(FeAlCoLa)xO2-δ固溶体 共掺杂 氧空位 氧化还原活性
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Mg2+掺杂Zn0.5Cd0.5S固溶体光催化剂的制备及光解水制氢 认领 引用 被引量：1
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作者 程彩虹 彭绍琴 李越湘 《有色金属（冶炼部分）》 CAS 北大核心 2012年第8期51-53,共3页
采用水热法制备了Cd0.5Zn0.5S和掺杂0.4%(摩尔百分数)Mg2+的0.4%Mg/Cd0.5Zn0.5S固溶体光催化剂。采用UV-Vis、XRD以及电化学等手段对催化剂进行表征,并考查催化剂可见光下分解水制氢的活性。结果表明:Mg2+掺杂提高了Cd0.5Zn0.5S固溶体... 采用水热法制备了Cd0.5Zn0.5S和掺杂0.4%(摩尔百分数)Mg2+的0.4%Mg/Cd0.5Zn0.5S固溶体光催化剂。采用UV-Vis、XRD以及电化学等手段对催化剂进行表征,并考查催化剂可见光下分解水制氢的活性。结果表明:Mg2+掺杂提高了Cd0.5Zn0.5S固溶体中光生电子和空穴的分离效率,大大提高了Cd0.5Zn0.5S固溶体光催化制氢的活性。 展开更多
关键词 光催化 制氢 Mg2+掺杂 Cd0.5Zn0.5S固溶体 可见光
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MgO掺杂对SnO2压敏电阻性能的影响 认领 引用
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作者 孙岩 任鑫 +4 位作者 吴育聪 杨莉禹 宁宇 姚政 施利毅 《电瓷避雷器》 CAS 2024年第5期79-83,共5页
采用传统的SnO2+CoO+Nb2O5+Cr2O3压敏电阻体系,深入研究了MgO掺杂对SnO2基压敏电阻综合电性能和微观形貌的影响。结果表明,当MgO掺杂量为0.5%(摩尔分数)可获得最佳的电性能,非线性系数为32,电压梯度为284.3 V/mm,漏... 采用传统的SnO2+CoO+Nb2O5+Cr2O3压敏电阻体系,深入研究了MgO掺杂对SnO2基压敏电阻综合电性能和微观形貌的影响。结果表明,当MgO掺杂量为0.5%(摩尔分数)可获得最佳的电性能,非线性系数为32,电压梯度为284.3 V/mm,漏电流为7.1μA。这是因为Mg2+作为受主掺杂剂,提高了表面态密度,当MgO的掺杂量超过SnO2样品的溶解度极限时,在晶界处形成尖晶石,由于钉扎效应阻止了ZnO晶粒的生长,因此晶粒尺寸减小并形成更多晶界,有效提高了SnO2压敏电阻的综合电性能。此外MgO的掺杂使得晶粒尺寸分布更均匀,降低了孔隙率,提高了样品的烧结密度。 展开更多
关键词 MgO掺杂 SnO2压敏电阻 固溶体 电气性能
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Doping of Ceria-Zirconia Solid Solution with Rare-earth Elements 认领 引用
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作者 HU Yu-cai FENG Chang-gen WANG Li-qiong WANG Ya-jun 《合成化学》 CAS 2004年第Z1期136-136,共1页
关键词 ceria-zirconia solid solution, doping, Ce0.6Zr0.3M0.1O2 (M=Y, La, Pr, Tb), three- way catalyst
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Catalytic Activity of Ceria-Zirconia Nanostructured Materials Prepared via Reversed Microemulsion Method 认领 引用 被引量：5
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作者 An Yuan Zhu Lingyun +1 位作者 Wang Jun Shen Meiqing 《Journal of Rare Earths》 SCIE EI CAS 2005年第6期690-694,共5页
Single-phase homogeneous Ce1-x ZrxO2 solid versed microemulsion method.The structural properties solutions with various compositions were synthesized using the reand performance of Ce1-xZrxO2 were studied using XRD,BE... Single-phase homogeneous Ce1-x ZrxO2 solid versed microemulsion method.The structural properties solutions with various compositions were synthesized using the reand performance of Ce1-xZrxO2 were studied using XRD,BET,SEM,HRTEM,TPR and CO oxidation measurements.The results show that in the range of x=0.4-0.5 and x=0.6-1.0,the solid solutions posses the cubic and the tetragonal phase structure,respectively,Solids obtained by the reversed microemulsion method were more homogeneous on the whole range of composition,XRD investigations of the prepared materials did not show segregation of cerium or zirconium oxides,Highly uniform nanosize solid solution particles of ceria-zirconia with high specific area(146.7 m^2·g^-1)were attained under the conditions of this study.The TPR results and CO oxidation measurements indicate that the performance of the CeO2-ZrO2 mixed oxides is strongly related to the composition and structure of the oxides.Enhancement of the activity was found for the catalyst prepared by reversed microemulsion method as compared to the sample prepared by sol-gel method. 展开更多
关键词 CeO2-ZrO2 solid solution reversed microemulsion nanosize catalytic property carbon monoxide oxidation rare earths
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