Phase Engineering of Molybdenum Carbide-Cobalt Heterostructures for Long-Lasting Zn-Air Batteries

被引：5
作者：
Liu, Wenxian [1 ]
Dai, Xiaojing [1 ]
Guo, Wei [1 ]
Tang, Jiawei [1 ]
Feng, Jinxiu [1 ]
Zheng, Dong [1 ]
Yin, Ruilian [2 ]
Wang, Yuxi [1 ]
Que, Wenbin [1 ]
Wu, Fangfang [1 ]
Shi, Wenhui [3 ]
Cao, Xiehong [1 ]
机构：
[1] Zhejiang Univ Technol, Coll Mat Sci & Engn, Hangzhou 310014, Peoples R China
[2] Zhejiang Univ Technol, Coll Chem Engn, Hangzhou 310014, Peoples R China
[3] Zhejiang Univ Technol, Coll Chem Engn, Ctr Membrane & Water Sci & Technol, Hangzhou 310014, Peoples R China
来源：
ACS APPLIED MATERIALS & INTERFACES | 2023年 / 15卷 / 35期
基金：
中国国家自然科学基金;
关键词：
molybdenum carbides; heterostructures; crystallinephase; oxygen reduction reaction; Zn-air battery; HYDROGEN EVOLUTION; BIFUNCTIONAL ELECTROCATALYSTS; NANOPARTICLES;
D O I：
10.1021/acsami.3c06711
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Developing highly active and robust oxygen catalysts is of great significance for the commercialization of Znair batteries (ZABs) with long-life stability. Herein, heterostructured catalysts comprising molybdenum carbide and metallic Co are prepared by a simple dicyandiamide-assisted pyrolysis strategy. Importantly, the crystalline phase of molybdenum carbide in the catalysts can be carefully regulated by adjusting the CoMoimidazole precursor and dicyandiamide ratio. The electronic configuration of Co and Mo centers as well as the phasedependent oxygen reduction reaction performance of these heterostructures (ss- Mo2C/Co, ss-Mo2C/.- MoC/Co, and.MoC/Co) was disclosed. A highly active.-MoC/Co cathode enables ZABs with outstanding long-term stability over 850 h with a low voltage decaying rate of 0.06 mV center dot h(-1) and high peak power density of 162 mW center dot cm(-2). This work provides a new idea for the rational design of efficient and stable cathode catalysts for ZABs.
引用
收藏
页码：41476 / 41482
页数：7
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