双功能
过电位
电催化剂
析氧
材料科学
氧气
双功能催化剂
异质结
化学工程
化学
催化作用
纳米技术
电化学
电极
有机化学
光电子学
物理化学
工程类
作者
Xinglong Xie,Zeyu Zhai,Wenwu Cao,Jian Dong,Yushan Li,Qiangchuan Hou,Guixiang Du,Jiajun Wang,Li Tian,Jingbo Zhang,Tierui Zhang,Lu Shang
标识
DOI:10.1016/j.jcis.2024.03.040
摘要
Rational construction of efficient and robust bifunctional oxygen electrocatalysts is key but challenging for the widespread application of rechargeable zinc-air batteries (ZABs). Herein, bifunctional ligand Co metal-organic frameworks were first explored to fabricate a hybrid of heterostructured CoOx/Co nanoparticles anchored on a carbon substrate rich in CoNx sites (CoOx/Co@CoNC) via a one-step pyrolysis method. Such a unique heterostructure provides abundant CoNx and CoOx/Co active sites to drive oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), respectively. Besides, their positive synergies facilitate electron transfer and optimize charge/mass transportation. Consequently, the obtained CoOx/Co@CoNC exhibits a superior ORR activity with a higher half-wave potential of 0.88 V than Pt/C (0.83 V vs. RHE), and a comparable OER performance with an overpotential of 346 mV at 10 mA cm-2 to the commercial RuO2. The assembled ZAB using CoOx/Co@CoNC as a cathode catalyst displays a maximum power density of 168.4 mW cm-2, and excellent charge-discharge cyclability over 250 h at 5 mA cm-2. This work highlights the great potential of heterostructures in oxygen electrocatalysis and provides a new pathway for designing efficient bifunctional oxygen catalysts toward rechargeable ZABs.
科研通智能强力驱动
Strongly Powered by AbleSci AI