A robust bifunctional electrocatalyst for rechargeable zinc-air batteries: NiFe nanoparticles encapsulated in nitrogen-doped carbon nanotubes

被引：17
作者：
Jiang, Minxia [1 ]
Tan, Zhi [1 ]
Cao, Minhua [1 ]
机构：
[1] Beijing Inst Technol, Beijing Key Lab Photoelect Elect Convers Mat, Sch Chem & Chem Engn, Minist Educ China,Key Lab Cluster Sci, Beijing 100081, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2021年 / 46卷 / 29期
基金：
中国国家自然科学基金;
关键词：
NiFe alloy; Carbon nanotubes; Bifunctional electrocatalyst; Zn-air batteries; ADVANCED MULTIFUNCTIONAL ELECTROCATALYSTS; ALLOY NANOPARTICLES; MESOPOROUS CARBON; COFE ALLOY; OXYGEN; CATALYSTS; PERFORMANCE; HYDROGEN; LAYERS;
D O I：
10.1016/j.ijhydene.2021.02.079
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Developing high-efficiency, low-cost, and stable bifunctional oxygen electrocatalysts is essential for the commercialization of rechargeable metal-air batteries. Herein, threedimensional self-assembled microspheres via in situ encapsulation of NiFe alloy nano particles (NPs) into N-doping carbon nanotubes (NiFe@NCNTs) have been achieved through pyrolyzing a mixture of nickel-iron alkoxide and melamine. The as-prepared electrocatalyst exhibits outstanding oxygen reduction reaction (ORR) performance with a half wave potential of 0.79 V and oxygen evolution reaction (OER) activity with a low over potential of 330 mV at 10 mA cm(-2). The eminent activity of NiFe@NCNTs is ascribed to high dispersion of active sites (zero-dimensional core-shell structure of NiFe@NC) and onedimensional conductive network (NCNTs). Accordingly, the zinc-air battery assembled with NiFe@NCNTs as the air cathode exhibits a long cycling life of 200 h with a high energy efficiency of 65.6%. This work may shed new light on the design of advanced bifunctional electrocatalysts toward metal-air batteries. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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页码：15507 / 15516
页数：10
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