Balance Between Fe-Ni Synergy and Lattice Oxygen Contribution for Accelerating Water Oxidation

Overview

Journal ACS Nano

Publisher American Chemical Society

Specialty Biotechnology

Date 2024 May 21

PMID 38771969

Authors

Chao Jing

Lili Li

Yi-Ying Chin

Chih-Wen Pao

Wei-Hsiang Huang

Miaomiao Liu

Jing Zhou

Taotao Yuan

Xiangqi Zhou

Yifeng Wang

Chien-Te Chen

Da-Wei Li

Jian-Qiang Wang

Zhiwei Hu

Linjuan Zhang

Affiliations

Soon will be listed here.

Abstract

Hydrogen obtained from electrochemical water splitting is the most promising clean energy carrier, which is hindered by the sluggish kinetics of the oxygen evolution reaction (OER). Thus, the development of an efficient OER electrocatalyst using nonprecious 3d transition elements is desirable. Multielement synergistic effect and lattice oxygen oxidation are two well-known mechanisms to enhance the OER activity of catalysts. The latter is generally related to the high valence state of 3d transition elements leading to structural destabilization under the OER condition. We have found that Al doping in nanosheet Ni-Fe hydroxide exhibits 2-fold advantage: (1) a strong enhanced OER activity from 277 mV to 238 mV at 10 mA cm as the Ni valence state increases from Ni to Ni observed from X-ray absorption spectra. (2) Operational stability is strengthened, while weakness is expected since the increased Ni content with 3dL (L denotes O 2p hole) would lead to structural instability. This contradiction is attributed to a reduced lattice oxygen contribution to the OER upon Al doping, as verified through Raman spectroscopy, while the enhanced OER activity is interpreted as an enormous gain in exchange energy of Fe-Ni, facilitated by their intersite hopping. This study reveals a mechanism of Fe-Ni synergy effect to enhance OER activity and simultaneously to strengthen operational stability by suppressing the contribution of lattice oxygen.

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