Citation: Elhussein Desoki Helal, Wenhai Xu, Liyao Gao, Yizhe Li, Hao Sun, Qingzhen Xu, Imran Ali Chandio, Safdar Abbas, Abdul Hameed Pato, Mohamed Mokhtar Mohamed, Man Zhao, Wen Liu. Dynamic self-engineering of Fe-doped NiSe₂ into amorphous γ-Fe_xNi_1-xOOH ultrathin nanosheets via electrochemical reconstruction for alkaline oxygen evolution[J]. Chinese Chemical Letters, ;2026, 37(8): 111311. doi: 10.1016/j.cclet.2025.111311 shu

Dynamic self-engineering of Fe-doped NiSe₂ into amorphous γ-Fe_xNi_1-xOOH ultrathin nanosheets via electrochemical reconstruction for alkaline oxygen evolution

Elhussein Desoki Helal ^{a, b, 1} ,
Wenhai Xu ^{a, 1} ,
Liyao Gao ^a ,
Yizhe Li ^a ,
Hao Sun ^a ,
Qingzhen Xu ^a ,
Imran Ali Chandio ^a ,
Safdar Abbas ^a ,
Abdul Hameed Pato ^a ,
Mohamed Mokhtar Mohamed ^b ,
Man Zhao ^{a, *,} ,
Wen Liu ^{a, *,}

a.
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
b.
Chemistry Department, Faculty of Science, Benha University, Benha 13518, Egypt

zhaom@buct.edu.cn

wenliu@buct.edu.cn

Received Date: 26 February 2025
Revised Date: 7 May 2025
Accepted Date: 13 May 2025
Available Online: 13 May 2025

Figures(4)

We report a facile low-temperature synthesis of Fe-doped NiSe₂ nanoparticles as an efficient pre-catalyst, which undergoes complete electrochemical reconstruction into amorphous γ-Fe_xNi_1-xOOH nanosheets (< 2 nm thickness) during activation process of cyclic voltammetry. The reconstituted catalyst achieves record-low overpotentials of 163 mV at 20 mA/cm² and 230 mV at 300 mA/cm², with a Tafel slope of 33.8 mV/dec and a turnover frequency (TOF) of 0.1 s^-1 at overpotential of 210 mV. Remarkably, it shows outstanding operational stability with negligible activity decay after 300 h chronopotentiometry at 100 mA/cm². Through multimodal ex situ/in situ characterizations, we conclusively identify the in situ-formed amorphous γ-Fe_xNi_1-xOOH nanosheets as the active phase, where Fe doping optimizes the electronic structure of Ni sites while the ultrathin morphology maximizes exposed active centers. This work establishes a universal precatalyst engineering strategy through controlled structural evolution of metastable precursors, applicable to diverse energy conversion systems.
- Oxygen evolution reaction,
- Water splitting,
- Iron-doped nickel selenide,
- Pre-catalyst,
- γ-Fe_xNi_1-xOOH
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Dynamic self-engineering of Fe-doped NiSe2 into amorphous γ-FexNi1-xOOH ultrathin nanosheets via electrochemical reconstruction for alkaline oxygen evolution

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通讯作者: 陈斌, bchen63@163.com

Dynamic self-engineering of Fe-doped NiSe₂ into amorphous γ-Fe_xNi_1-xOOH ultrathin nanosheets via electrochemical reconstruction for alkaline oxygen evolution