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Integrated Hierarchical Carbon Flake Arrays with Hollow P‐Doped CoSe 2 Nanoclusters as an Advanced Bifunctional Catalyst for Zn–Air Batteries
Author(s) -
Zhang Hong,
Wang Tongtong,
Sumboja Afriyanti,
Zang Wenjie,
Xie Jianping,
Gao Daqiang,
Pennycook Stephen J.,
Liu Zhaolin,
Guan Cao,
Wang John
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201804846
Subject(s) - bifunctional , materials science , nanoclusters , overpotential , oxygen evolution , nanotechnology , electrocatalyst , doping , catalysis , carbon fibers , mesoporous material , chemical engineering , electrochemistry , composite number , electrode , chemistry , optoelectronics , composite material , organic chemistry , engineering
Hierarchical nanostructured architectures are demonstrated as an effective approach to develop highly active and bifunctional electrocatalysts, which are urgently required for efficient rechargeable metal–air batteries. Herein, a mesoporous hierarchical flake arrays (FAs) structure grown on flexible carbon cloth, integrated with the microsized nitrogen‐doped carbon (N‐doped C) FAs, nanoscaled P‐doped CoSe 2 hollow clusters and atomic‐level P‐doping (P‐CoSe 2 /N‐C FAs) is described. The P‐CoSe 2 /N‐C FAs thus developed exhibit a reduced overpotential (≈230 mV at 10 mA cm −2 ) toward oxygen evolution reaction (OER) and large half‐wave potential (0.87 V) for oxygen reduction reactions. The excellent bifunctional electrocatalytic performance is ascribed to the synergy among the hierarchical flake arrays controlled at both micro‐ and nanoscales, and atomic‐level P‐doping. Density functional theory calculations confirm that the free energy for the potential‐limiting step is reduced by P‐doping for OER. An all‐solid‐state zinc–air battery made of the P‐CoSe 2 /N‐C FAs as the air‐cathode presents excellent cycling stability and mechanical flexibility, demonstrating the great potential of the hierarchical P‐CoSe 2 /N‐C FAs for advanced bifunctional electrocatalysis.