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Nontrivial Topological Surface States in Ru 3 Sn 7 toward Wide pH-Range Hydrogen Evolution Reaction.

Zongpeng WangZhiping LinYinglan WangShijie ShenQinghua ZhangJiacheng WangWenwu Zhong
Published in: Advanced materials (Deerfield Beach, Fla.) (2023)
Nontrivial topological surface states (TSSs), which possess extraordinary carrier mobility and are protected by the bulk symmetry, have emerged as an innovative platform to search for efficient electrocatalysts toward hydrogen evolution reaction (HER). Here, we prepare a Sn-based nontrivial metal Ru 3 Sn 7 using electrical arc melting method. Our results indicate that the (001) crystal family of Ru 3 Sn 7 possesses nontrivial TSSs with linear dispersion relation and large nontrivial energy window. Experimental and theoretical results demonstrate that nontrivial TSSs of Ru 3 Sn 7 could significantly boost charge transfer kinetics and optimize adsorption of hydrogen intermediates due to bulk symmetry-protected band structures. As expected, nontrivial Ru 3 Sn 7 exhibits superior HER activity to Ru, Pt/C, and trivial counterparts (e.g., Ru 2 Sn 3 , IrSn 2 , and Rh 3 Sn 2 ) with higher ratios of noble metals. Furthermore, the wide pH-range activity of topologically nontrivial Ru 3 Sn 7 implies the robustness of its TSSs against pH variation during the HER. Our findings provide a promising approach to the rational design of topologically nontrivial metals as highly efficient electrocatalysts. This article is protected by copyright. All rights reserved.
Keyphrases
  • energy transfer
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  • mass spectrometry
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