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Mesoporous PdAg Nanospheres for Stable Electrochemical CO 2 Reduction to Formate
Author(s) -
Zhou Yuan,
Zhou Rui,
Zhu Xiaorong,
Han Na,
Song Bin,
Liu Tongchao,
Hu Guangzhi,
Li Yafei,
Lu Jun,
Li Yanguang
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202000992
Subject(s) - overpotential , materials science , mesoporous material , formate , faraday efficiency , electrochemistry , selectivity , palladium , chemical engineering , inorganic chemistry , aqueous solution , electrode , reversible hydrogen electrode , catalysis , chemistry , organic chemistry , working electrode , engineering
Palladium is a promising material for electrochemical CO 2 reduction to formate with high Faradaic efficiency near the equilibrium potential. It unfortunately suffers from problematic operation stability due to CO poisoning on surface. Here, it is demonstrated that alloying is an effective strategy to alleviate this problem. Mesoporous PdAg nanospheres with uniform size and composition are prepared from the co‐reduction of palladium and silver precursors in aqueous solution using dioctadecyldimethylammonium chloride as the structure‐directing agent. The best candidate can initiate CO 2 reduction at zero overpotential and achieve high formate selectivity close to 100% and great stability even at <‐0.2 V versus reversible hydrogen electrode. The high selectivity and stability are believed to result from the electronic coupling between Pd and Ag, which lowers the d‐band center of Pd and thereby significantly enhances its CO tolerance, as evidenced by both electrochemical analysis and theoretical simulations.