期刊
SMALL
卷 16, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202004855
关键词
air cathode; atomic clusters; bimetallic Cu‐ Zn; oxygen reduction reaction; Zn‐ air battery
类别
资金
- National Key R&D Program of China [2017YFA0700104]
- National Natural Science Foundation of China [21601136, 51971157, 22075211, 51761165012]
- Tianjin Science Fund for Distinguished Young Scholars [19JCJQJC61800]
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.
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