In:
Small, Wiley, Vol. 16, No. 48 ( 2020-12)
Kurzfassung:
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.
Materialart:
Online-Ressource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.202004855
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2020
ZDB Id:
2168935-0
