双功能
过电位
析氧
材料科学
电催化剂
催化作用
化学工程
氢氧化物
复合数
纳米技术
碳纤维
电化学
无机化学
电极
化学
复合材料
有机化学
工程类
物理化学
作者
Di Chen,Xing Chen,Zhenxing Cui,Guofu Li,Bing Han,Qian Zhang,Jing Sui,Hongzhou Dong,Jianhua Yu,Liyan Yu,Lifeng Dong
标识
DOI:10.1016/j.cej.2020.125718
摘要
The rational design and synthesis of efficient and durable bifunctional electrocatalysts for oxygen reduction reactions (ORRs) and oxygen evolution reactions (OERs) is significant yet challenging for rechargeable Zn-air batteries. Up to now, most attention has been focused on the ORR performance, but the disproportion of OER proficiencies results in poor cycling capabilities and energy waste during charging process. Herein, a dual-active-site hierarchical composite ([email protected]) is constructed by anchoring high OER-active NiFe layered double hydroxide (NiFe-LDH) nanosheets on the surface of ORR-active ZIF-derived carbon-based framework. This design fully utilizes their advantages and synergistic effects, such as good conductivity, hierarchical structure, ORR-active sites of Co, N-codoped carbon (Co-NC) substrate and OER-active sites of NiFe-LDH, to optimize bifunctional catalytic performance and durability in Zn-air batteries. The [email protected] demonstrates a lower overpotential of 819 mV than single component Co-NC (893 mV), NiFe-LDH (1178 mV) and noble-metal catalysts (957 mV for Pt/C and 1118 mV for RuO2) in alkaline media. Impressively, a high peak power density (107.8 mW cm−2) and excellent durability (over 300 h) are exhibited by Zn-air batteries based on [email protected] as electrocatalyst. This work provides a facile, low-cost and environmental-friendly strategy to synthesize bifunctional catalysts for efficient and durable zinc-air batteries.
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