Precise constructed atomically dispersed Fe/Ni sites on porous nitrogen-doped carbon for oxygen reduction

双金属片 催化作用 碳纤维 材料科学 化学工程 吸附 电子转移 金属 热解 纳米技术 化学 无机化学 物理化学 复合材料 有机化学 冶金 复合数 工程类
作者
Jirong Bai,Wenzheng Ge,Pin Zhou,Peng Xu,Lingling Wang,Jianping Zhang,Xiankai Jiang,Xi Li,Quanfa Zhou,Yaoyao Deng
出处
期刊:Journal of Colloid and Interface Science [Elsevier BV]
卷期号:616: 433-439 被引量:43
标识
DOI:10.1016/j.jcis.2022.02.080
摘要

Exploring highly-efficient noble-metal-free electrocatalysts for oxygen reduction reaction (ORR) is crucial for preparation of rechargeable metal-air batteries. Herein, FeNi-mIm (guest) was loaded on the surface of ZIF-8 (host) via a novel host-guest strategy, and the resulting ZIF-8@FeNi(mIm)X precursors can be converted to FeNi SAs/NC catalysts with controllable structures. Robust metal-organic framework (MOF)-derived atomically dispersed Fe/Ni dual single atom electrocatalysts for ORR were developed, followed by pyrolysis of the precursors. Characterizations showed that the atomically-dispersed Fe/Ni active sites were uniformly embedded in the N-doped carbon framework. As a result, the ORR performance was obviously improved with lower half-wave potential (E1/2 = 0.91 V) in alkaline media. Such improvement is mainly attributed to the synergy of fully-exposed bimetallic single atom active sites caused by the interaction of Fe/Ni 3d orbitals. The lower adsorption energy of intermediate hydroxyl groups on the active sites and the smaller ORR energy barrier were calculated by the density functional theory. The novelty FeNi SAs/NC catalysts showed faster ORR dynamics in the rate-determining step of four-electron transfer. The synthesis strategy reported here provides an efficient approach to construct high performance dual single-atom catalysts with fully-exposed active sites on the surface.
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