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Modulation of Charge Redistribution in Heterogeneous NiO‐Ni~3~Se~4~ Nanosheet Arrays for Advanced Water Electrolysis by Liang Yan; Jiayu Liang; Dan Song; Xinyi Li; Hao Li is a Engineering article available to read on EtoBox.

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## Abstract Developing highly effective electrocatalysts capable of bifunctionally facilitating hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is paramount for advancing water electrolysis. Herein, the authors report heterogeneous NiO‐Ni~3~Se~4~ nanosheet arrays grown on Ti~3~C~2~T~x~ MXene (NiO‐Ni~3~Se~4~/MXene) with asymmetrical charge distribution as bifunctional electrocatalysts to enhance the electrocatalytic performance for overall water splitting. Impressively, the meticulously engineered NiO‐Ni~3~Se~4~/MXene exhibits remarkable catalytic activities for the HER and the OER with low overpotentials of 50 mV and 260 mV at 10 mA cm^−2^, respectively. Moreover, the electrolyzer equipped with NiO‐Ni~3~Se~4~/MXene as both the cathode and anode demonstrates outstanding performance, reaching 10 mA cm^−2^ at a low cell voltage of 1.54 V and maintaining exceptional long‐term durability for over 50 h. The combination of theoretical calculations and experiments unveils the charge transfer induced at heterointerfaces in the NiO‐Ni~3~Se~4~ heterogeneous, leading to asymmetrical charge distributions, which modulate the adsorption/desorption of the reaction intermediat

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Author

Liang Yan; Jiayu Liang; Dan Song; Xinyi Li; Hao Li

Publisher

Wiley

Published

2023

Field

Engineering (Physical Sciences)