电催化剂
催化作用
纳米颗粒
电化学
钴
电解质
材料科学
化学工程
贵金属
碳纤维
过渡金属
无机化学
纳米技术
化学
电极
复合材料
复合数
有机化学
物理化学
工程类
作者
Peipei Li,Meiling Fan,Yapeng Cheng,Hongfei Pan,Jin Liu,Haining Zhang
出处
期刊:ACS omega
[American Chemical Society]
日期:2023-12-20
标识
DOI:10.1021/acsomega.3c07229
摘要
Porous carbon materials with nitrogen-coordinated transition metal active sites have been widely regarded as appealing alternatives to replace noble metal catalysts in oxygen-based electrochemical reaction activities. However, improving the electrocatalytic activity of transition-metal-based catalysts remains a challenge for widespread application in renewable devices. Herein, we use a simple one-step pyrolysis method to construct a Co nanoparticles/Co-Nx-decorated carbon framework catalyst with a near-total external surface structure and uniform dispersion nanoparticles, which displays promising catalytic activity and superior stability for oxygen reduction reactions in both alkaline and neutral electrolytes, as evidenced by the positive shift of half-wave potential by 44 and 11 mV compared to 20% Pt/C. Excellent electrochemical performance originates from highly accessible Co nanoparticles/Co-Nx active sites at the external surface structure (this is, exposing active sites). The thus-assembled liquid zinc-air battery using the synthesized electrocatalyst as the cathode material delivers a maximum power density of 178 mW cm-2 with an open circuit potential of 1.48 V and long-term discharge stability over 150 h.
科研通智能强力驱动
Strongly Powered by AbleSci AI