Abstract
A facile in situ redox strategy has been developed to fabricate surfactant-free M-Fe2O3 (M = Pt, Pd, Au) hybrid nanospheres. In this process, noble metal salts were directly reduced by the pre-prepared Fe3O4 components in an alkaline aqueous solution without using organic reductants and surfactants. During the redox reaction, Fe3O4 was oxidized into Fe2O3, and the reduzates of noble metal nanoparticles were deposited on the surface of the Fe2O3 nanospheres. Then the characterizations were discussed in detail to study the formation of M-Fe2O3 hybrids. At last, catalytic CO oxidation was selected as a model reaction to evaluate the catalytic performance of these samples. It demonstrates that Pt-Fe2O3 nanospheres can catalyze 100 % conversion of CO into CO2 at 90°C, indicating superior activity relative to Pd-Fe2O3 and Au-Fe2O3.
摘要
本工作利用原位氧化还原策略, 成功制备出无表面活性剂修饰的M-Fe2O3(M=Pt, Pd, Au)杂化纳米球. 在反应过程中, 以事先制备好的Fe3O4纳米球作为载体和还原剂, 在碱性条件下直接还原高价态的贵金属盐前躯体. 反应后, Fe3O4被氧化成Fe2O3, 而贵金属纳米粒子作为还原产物则牢牢的沉积在氧化产物Fe2O3表面形成M-Fe2O3杂化纳米球. 通过表征系统研究了所得产物的形貌、结构和催化性质. 并以CO催化氧化为模型反应对产物进行评估, 结果表明, 样品Pt-Fe2O3在90°C即可将CO 100%催化转化为CO2, 相比Pd-Fe2O3和Au-Fe2O3具有更高的催化活性.
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Wang Li received her bachelor degree from Changzhi University in 2014. She is currently a graduate student under the supervision of Prof. Yu Zhang at the School of Chemistry and Environment, Beihang Univerisity. Her research interest is mainly focused on the synthesis of advanced inorganic materials and their applications in catalysis and lithium/sodium ion batteries.
Yu Zhang received his PhD degree in chemistry from Jilin University in 2007. Then he worked as a New Energy and Industrial Technology Development Organization (NEDO) fellow at Hiroshima University, Japan. In March 2013, he joined Beihang University as a “Zhuoyue” Program Associate Professor. Now he is a professor of the School of Chemistry and Environment, Beihang University. His interests mainly focus on advanced materials for hydrogen storage/ production, lithium/sodium ion battery and fuel cells.
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Li, W., Feng, X., Liu, D. et al. In situ redox strategy for large-scale fabrication of surfactant-free M-Fe2O3 (M = Pt, Pd, Au) hybrid nanospheres. Sci. China Mater. 59, 191–199 (2016). https://doi.org/10.1007/s40843-016-5038-1
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DOI: https://doi.org/10.1007/s40843-016-5038-1