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N, P‐doped CoS 2 Embedded in TiO 2 Nanoporous Films for Zn–Air Batteries
Author(s) -
Guo Limin,
Deng Jinan,
Wang Guanzhi,
Hao Yanan,
Bi Ke,
Wang Xiaohui,
Yang Yang
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.201804540
Subject(s) - bifunctional , nanoporous , materials science , electrocatalyst , nanoclusters , catalysis , dopant , chemical engineering , doping , cathode , redox , nanotechnology , electrode , chemistry , electrochemistry , organic chemistry , optoelectronics , engineering , metallurgy
The search for efficient and cost‐effective catalysts for bifunctional oxygen reduction and evolution reaction (ORR and OER) is highly demanded because of the sluggish four‐electron transfer involved redox reactions in Zn–air batteries (ZABs). Herein, (N, P) codoped CoS 2 nanoclusters embedded inside TiO 2 nanoporous films (denoted as N, P/CoS 2 @TiO 2 NPFs) are synthesized as novel bifunctional ORR/OER catalysts for ZABs. The catalytic activity and stability are promoted by the (N, P)‐dopants due to the enhanced conductivity, increased active surface area, and facilitated reaction kinetics. The N, P/CoS 2 @TiO 2 NPFs exhibit exceptional onset potentials of 0.91 and 1.41 V for ORR and OER, respectively. When used as cathodes in ZABs, the N, P/CoS 2 @TiO 2 NPFs exhibit a reduced charge–discharge gap of 0.8 V at 10 mA cm −2 and a stable cycling performance over 130 h, surpassing the conventional Pt/C+IrO 2 catalysts. Moreover, the assembled ZABs delivering a specific capacity of 610 mAh g −1 can be used for flexible devices. This work provides a path for the rational design of bifunctional electrocatalyst for ZABs.