Balance between FeIV–NiIV synergy and Lattice Oxygen Contribution for Accelerating Water Oxidation
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
TL;DR
This study explores how adding aluminum to a nickel-iron catalyst improves its efficiency and stability for water splitting, a key process for clean hydrogen production.
Contribution
The paper reveals a new mechanism where FeIV–NiIV synergy enhances OER activity while suppressing lattice oxygen contribution to improve stability.
Findings
Al doping increases Ni valence state, boosting OER activity from 277 mV to 238 mV at 10 mA cm–2.
Al doping reduces lattice oxygen contribution, improving operational stability despite higher NiIV content.
Enhanced OER activity is attributed to increased exchange energy from FeIV–NiIV intersite hopping.
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–2 as the Ni valence state increases from Ni3.58+ to Ni3.79+ observed from in situ X-ray absorption spectra. (2) Operational stability is strengthened, while weakness is…
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Taxonomy
TopicsElectrocatalysts for Energy Conversion · Advanced battery technologies research · Ammonia Synthesis and Nitrogen Reduction