文献类型：期刊文献

英文题名：Superior Performance of Ag over Pt for Hydrogen Evolution Reaction in Water Electrolysis under High Overpotentials

作者：Mo, Jiaying[1];Stefanov, Bozhidar I.[1];Lau, Thomas H. M.[1];Chen, Tianyi[1];Wu, Simson[1];Wang, Zhiqiang[2];Gong, Xue-Qing[2];Wilkinson, Ian[3];Schmid, Guenter[4];Tsang, Shik Chi Edman[1]

机构：[1]Univ Oxford, Dept Chem, Wolfson Catalysis Ctr, Oxford OX1 3QR, England;[2]East China Univ Sci & Technol, Shanghai 200237, Peoples R China;[3]Siemens Plc, CT NTF, Wharf Rd, Oxford OX29 4BP, England;[4]Siemens AG Erlangen Sud, D-91052 Erlangen, Germany

年份：2019

卷号：2

期号：2

起止页码：1221

外文期刊名：ACS APPLIED ENERGY MATERIALS

收录：;EI(收录号：20200708177984);WOS:【SCI-EXPANDED(收录号:WOS:000459948900034)】；

基金：We acknowledge the financial support from EPSRC-IUK (EP/N510026/1) and Siemens AG for this work.

语种：英文

外文关键词：hydrogen production; water electrolysis; PEM electrolyzer; overpotential; silver

摘要：There has been a substantial research effort worldwide to develop non-noble metal catalysts in electrolyzers for H-2 production from renewable energy sources. Pt catalysts are found to display the highest hydrogen evolution reaction (HER) activity under typical experimental conditions with relatively low acidity and overpotentials. However, it is noted that catalytic activity is highly dependent on acidity and applied potential used. In real practice of a high workload electrolyzer, high acidity and large negative potentials are required to optimize the HER activity. We hereby report that inexpensive silver catalysts, particularly the cubic form of silver nanoparticles, can clearly exhibit superior HER activity over Pt with a different rate-determining step in an electrolyzer when such conditions are reached. This is attributed to the weaker Ag-H bond at the surface than Pt-H which is more favorable for H recombination to form H-2. It is thus believed that this study provides new insights into designing economical and highly efficient catalysts that can replace the expensive noble metal analogues in a working electrolyzer.