4.8 Article

Ultrathin Co(OH)2 Nanosheets@Nitrogen-Doped Carbon Nanoflake Arrays as Efficient Air Cathodes for Rechargeable Zn-Air Batteries

期刊

SMALL
卷 17, 期 35, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202101720

关键词

cobalt hydroxides; nitrogen-doped carbon; oxygen evolution reaction; oxygen reduction reaction; Zn-air batteries

资金

  1. National Natural Science Foundation of China [51772213]
  2. Shanghai Science and Technology Committee [18ZR1442300, 18JC1410900]
  3. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology

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The study reports an efficient bifunctional oxygen electrocatalyst Co(OH)(2)@NC, showing excellent bifunctional activity, and exhibiting outstanding performance in rechargeable Zn-air batteries.
Developing highly active, cost-effective, and durable bifunctional oxygen electrocatalysts is an important step for the advancement of rechargeable Zn-air batteries (ZABs). Herein, an efficient bifunctional oxygen electrocatalyst of ultrathin Co(OH)(2) nanosheets supported on nitrogen-doped carbon nanoflake arrays (named as Co(OH)(2)@NC), is reported, which yields excellent bifunctional activity, i.e., a low overpotential of 285 mV to reach 10 mA cm(-2) for oxygen evolution reaction (OER), a high half-wave potential (0.83 V) for oxygen reduction reaction (ORR), and a low potential gap (Delta E) of 0.69 V. The excellent bifunctional catalytic performance can be ascribed to the concerted efforts of cobalt hydroxide toward OER and nitrogen-doped carbon for ORR. The Co(OH)(2)@NC nanoflake arrays is further used as binder-free air cathodes for rechargeable Zn-air batteries, exhibiting a high specific capacity of 798.3 mAh g(Zn)(-1), improved stability (a working life of >70 h at 5 mA cm(-2)), as well as a reduced long-term charging voltage, which outperforms the counterparts of NC nanoflake arrays and Pt/C-based air cathodes. One step further, the Co(OH)(2)@NC nanoflake arrays on carbon cloth are directly used as binder-free air cathodes for flexible, solid-state ZABs, showing excellent performance under deformation as well.

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