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Engineering Atomic Sites via Adjacent Dual‐Metal Sub‐Nanoclusters for Efficient Oxygen Reduction Reaction and Zn‐Air Battery
Author(s) -
Qi Defeng,
Liu Yifan,
Hu Min,
Peng Xianyun,
Qiu Yuan,
Zhang Shusheng,
Liu Wei,
Li Hongyi,
Hu Guangzhi,
Zhuo Longchao,
Qin Yongji,
He Jia,
Qi Gaocan,
Sun Jiaqiang,
Luo Jun,
Liu Xijun
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202004855
Subject(s) - tafel equation , catalysis , nanoclusters , materials science , battery (electricity) , transition metal , metal , oxygen , carbon fibers , cathode , inorganic chemistry , chemical engineering , nanotechnology , chemistry , electrode , metallurgy , electrochemistry , organic chemistry , composite material , power (physics) , physics , quantum mechanics , engineering , composite number
N‐coordinated transition‐metal materials are crucial alternatives to design cost‐effective, efficient, and highly durable catalysts for electrocatalytic oxygen reduction reaction. Herein, the synthesis of uniformly distributed Cu − Zn clusters on porous N‐doped carbon, which are accompanied by Cu/Zn‐N x single sites, is demonstrated. X‐ray absorption fine structure tests reveal the co‐existence of M − N (M = Cu or Zn) and M − M bonds in the catalyst. The catalyst shows excellent oxygen reduction reaction (ORR) performance in an alkaline medium with a positive half‐wave potential of 0.884 V, a superior kinetic current density of 36.42 mA cm −2 at 0.85 V, and a Tafel slope of 45 mV dec −1 , all of which are among the best‐reported results. Furthermore, when employed as an air cathode in Zn‐Air battery, it reveals a high open‐cycle potential of 1.444 V and a peak power density of 164.3 mW cm −2 . Comprehensive experiments and theoretical calculations approved that the high activity of the catalyst can be attributed to the collaboration of the Cu/Zn‐N 4 sites with CuZn moieties on N‐doped carbons.