双功能
电催化剂
兴奋剂
析氧
材料科学
氧气
化学工程
阴极
掺杂剂
克拉克电极
纳米技术
无机化学
化学
催化作用
电极
电解质
光电子学
电化学
有机化学
物理化学
工程类
作者
Xue Wang,Kai Li,Decai Yang,Xiaolong Yang,Meiling Xiao,Lirong Zheng,Xing Wang,Changpeng Liu,Jianbing Zhu
出处
期刊:Small
[Wiley]
日期:2024-01-31
标识
DOI:10.1002/smll.202310250
摘要
The commercialization of rechargeable Zn-air batteries (ZABs) relies on the material innovation to accelerate the sluggish oxygen electrocatalysis kinetics. Due to the differentiated mechanisms of reverse processes, i.e., oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), rationally integrating dual sites for bifunctional oxygen electrocatalysis is prerequisite yet remains challenging. Herein, multicomponent synergistic active sites within highly graphitic carbon substrate are exquisitely constructed, which is accomplished by fluorine (F) modulation strategy. The incorporation of F dopants facilitates pyridinic N formation for anchoring single metal sites, thus guaranteeing the coexistence of sufficient M-Nx sites and metal nanoparticles toward bifunctional oxygen electrocatalysis. As a result, the optimal catalyst, denoted as F NH2 -FeNi-800, outperforms commercial Pt/C+RuO2 with smaller gap between Ej = 10 and E1/2 (ΔE) of 0.63 V (vs 0.7 V for Pt/C+RuO2 ), demonstrating its superior bifunctionality. Beyond that, its superiority is validated in homemade rechargeable ZABs. ZABs assembled using F NH2 -FeNi-800 as the air cathode delivers higher peak power density (123.8 mW cm-2 ) and long-cycle lifetime (over 660 cycles) in comparison with Pt/C@RuO2 (68.8 mW cm-2 ; 300 cycles). The finding not only affords a highly promising oxygen electrocatalyst, but also opens an avenue to constructing multifunctional active sites for heterogeneous catalysts.
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