双功能
电催化剂
石墨烯
析氧
催化作用
化学
化学工程
氧化物
材料科学
碳纤维
无机化学
纳米技术
电极
电化学
复合数
有机化学
物理化学
工程类
复合材料
作者
Jing Zhao,Qianqian Li,Qichun Zhang,Rui Liu
标识
DOI:10.1016/j.cej.2021.133730
摘要
To accelerate the sluggish kinetics for oxygen reduction/evolution reaction (ORR/OER) of metal-free carbon catalysts, we here report an electrochemically active-active interface for promoting ORR/OER kinetics, which is constructed by in-situ coupling N-doped sub-micron carbon tubes (N-SMCTs, electron donors) with N-doped reduced graphene oxide (N-rGO, electron acceptors). We find that [email protected] yields superior bifunctional ORR/OER activity with high durability (E1/2 of 0.87 V for ORR, η10 of 351 mV for OER). Moreover, the zinc-air battery with this material as an electrode displays high power density of 126 mW cm−2 with excellent cycle stability. Density functional theory (DFT) unveils a dual-site mechanism: the carbon adjacent to graphitic-N in N-SMCTs is the most active site for *OOH intermediate while the carbon neighboring to pyridinic-N in N-rGO is beneficial for the adsorption of *O/*OH intermediates. The unique active-active interface with dual-site mechanism suggests its potential to overcome energy barrier bottleneck in the traditional bifunctional oxygen catalysts.
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