In-Situ Generated High-Valent Iron Single-Atom Catalyst for Efficient Oxygen Evolution.

Impact Factor:

11.189

DOI number:

10.1021/acs.nanolett.1c01335

Journal:

Nano Lett.

Key Words:

single atom catalysts high-valent iron oxygen evolution

Abstract:

Oxygen evolution reaction (OER) plays an important role in renewable energy supplies as the anodic reaction for electrochemical transformation of various chemicals. Iron-based OER catalysts are potential candidates due to their abundance but suffer from poor activity. Here we demonstrate that a single-atom iron catalyst with in-situ generated Fe4+ centers is highly active toward OER. Only an overpotential of 320 mV was needed to reach 10 mA cm(-2). The catalyst exhibited an ultrahigh turnover frequency of 0.62 s(-1) at an overpotential of 0.35 V, which is comparable to currently reported transitional-metal based OER catalysts. Experimental and theoretical studies revealed that the valence state of the metal center transferred from Fe3+ to highly active Fe4+ prior to the OER process. This transformation was originated from the strong interaction between atomic Fe and carbon support via C-O-Fe bonding, leading to a lower energy barrier of the rate-limiting *OOH formation.

Co-author:

Xiangyang Li, Chunxiao Liu, Dongdi Wang, Rui Si, Jinlong Yang

First Author:

Zhirong Zhang, Chen Feng

Correspondence Author:

Shiming Zhou, Jie Zeng

Document Type:

SCI

Volume:

21

Issue:

11

Page Number:

4795-4801

Translation or Not:

no

Date of Publication:

2021-05-21

Links to published journals:

https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.1c01335