1. Synthesis and Characterization of Pt‐Ag Icosahedral Nanocages with Enhanced Catalytic Activity toward Oxygen Reduction.
- Author
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Wang, Wenxia, Shi, Yifeng, Chen, Zitao, Zhao, Ming, Cao, Zhenming, Lyu, Zhiheng, Chen, Ruhui, Xiao, Kaijun, Chi, Miaofang, and Xia, Younan
- Subjects
OXYGEN reduction ,CATALYTIC activity ,PRECIOUS metals ,NANOCRYSTALS ,ELECTROCATALYSTS ,ELECTRO-osmosis - Abstract
There is an urgent need to develop cost‐effective electrocatalysts based on Pt for a broad spectrum of applications, including those vital to the operation of fuel cells. Hollowing out the interior of Pt nanocrystals offers a simple and viable strategy for maximizing the utilization efficiency of this precious metal while enhancing the electrocatalytic performance. Herein, we report the synthesis and electrocatalytic evaluation of Pt−Ag icosahedral nanocages with an average wall thickness of 1.6 nm. The Pt atoms are coated on the surface of Ag icosahedral seeds, leading to the formation of Ag@PtnL core‐shell icosahedral nanocrystals with tunable shell thicknesses. The core‐shell nanocrystals are then converted to icosahedral nanocages by selectively etching away the Ag in the core. The as‐obtained nanocages with a composition of Pt4.5Ag exhibit an almost 3‐fold enhancement in specific activity toward oxygen reduction relative to the commercial Pt/C in acid media. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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