以铂、钌和二氧化锡修饰的金纳米颗粒作为酸性介质中乙醇氧化反应的电催化剂。
Au Nanoparticles Modified with Pt, Ru and SnO as Electrocatalysts for Ethanol Oxidation Reaction in Acids.
作者信息
Siddharth Kumar, Xing Zelong, Xiao Fei, Zhu Shangqian, Zhang Lili, Pan Feng, Shao Minhua
机构信息
Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong.
Jiangsu Key Laboratory for Chemistry of Low-Dimension Materials, Huaiyin Normal University, Huaian, 223300, Jiangsu, China.
出版信息
Chem Asian J. 2020 Jul 16;15(14):2174-2180. doi: 10.1002/asia.202000336. Epub 2020 Jun 12.
The anodic reaction in direct ethanol fuel cells (DEFCs), ethanol oxidation reaction (EOR) faces challenges, such as incomplete electrooxidation of ethanol and high cost of the most efficient electrocatalyst, Pt in acidic media at low temperature. In this study, core-shell electrocatalysts with an Au core and Pt-based shell (Au@Pt) are developed. The Au core size and Pt shell thickness play an important role in the EOR activity. The Au size of 2.8 nm and one layer of Pt provide the most optimized performance, having 6 times higher peak current density in contrast to commercial Pt/C. SnO as a support also enhances the EOR activity of Au@Pt by 1.73 times. Further modifying the Pt shell with Ru atoms achieve the highest EOR current density that is 15 and 2.5 times of Pt/C and Au@Pt. Our results suggest the importance of surface modification in rational design of advanced electrocatalysts.
在直接乙醇燃料电池（DEFCs）中，阳极反应即乙醇氧化反应（EOR）面临诸多挑战，比如乙醇的不完全电氧化以及在低温酸性介质中最有效的电催化剂铂的成本高昂。在本研究中，开发了具有金核和铂基壳层的核壳结构电催化剂（Au@Pt）。金核尺寸和铂壳厚度对乙醇氧化反应活性起着重要作用。2.8纳米的金尺寸和一层铂提供了最优化的性能，与商业铂碳相比，其峰值电流密度高出6倍。氧化锡作为载体还使Au@Pt的乙醇氧化反应活性提高了1.73倍。用钌原子进一步修饰铂壳层可实现最高的乙醇氧化反应电流密度，分别是铂碳和Au@Pt的15倍和2.5倍。我们的结果表明表面修饰在先进电催化剂合理设计中的重要性。
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