非阻塞I/O
双功能
材料科学
化学工程
多孔性
纳米线
催化作用
纳米技术
化学
复合材料
工程类
有机化学
作者
Jie Yin,Yuxuan Li,Fan Lv,Qiaohui Fan,Yongqing Zhang,Qiaolan Zhang,Wei Wang,Peng Cheng,Pinxian Xi,Shaojun Guo
出处
期刊:ACS Nano
[American Chemical Society]
日期:2017-02-16
卷期号:11 (2): 2275-2283
被引量:434
标识
DOI:10.1021/acsnano.7b00417
摘要
The development of highly efficient bifunctional catalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is crucial for improving the efficiency of the Zn-air battery. Herein, we report porous NiO/CoN interface nanowire arrays (PINWs) with both oxygen vacancies and a strongly interconnected nanointerface between NiO and CoN domains for promoting the electrocatalytic performance and stability for OER and ORR. Extended X-ray absorption fine structure spectroscopy, electron spin resonance, and high-resolution transmission electron microscopy investigations demonstrate that the decrease of the coordination number for cobalt, the enhanced oxygen vacancies on the NiO/CoN nanointerface, and strongly coupled nanointerface between NiO and CoN domains are responsible for the good bifunctional electrocatalytic performance of NiO/CoN PINWs. The primary Zn-air batteries, using NiO/CoN PINWs as an air-cathode, display an open-circuit potential of 1.46 V, a high power density of 79.6 mW cm-2, and an energy density of 945 Wh kg-1. The three-series solid batteries fabricated by NiO/CoN PINWs can support a timer to work for more than 12 h. This work demonstrates the importance of interface coupling and oxygen vacancies in the development of high-performance Zn-air batteries.
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