Modulation of Charge Redistribution in Heterogeneous NiO‐Ni₃Se₄ Nanosheet Arrays for Advanced Water Electrolysis

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‐Ni3Se4 nanosheet arrays grown on Ti3C2Tx MXene (NiO‐Ni3Se4/MXene) with asymmetrical charge distribution as bifunctional electrocatalysts to enhance the electrocatalytic performance for overall water splitting. Impressively, the meticulously engineered NiO‐Ni3Se4/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‐Ni3Se4/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‐Ni3Se4 heterogeneous, leading to asymmetrical charge distributions, which modulate the adsorption/desorption of the reaction intermediates and enhance the reaction kinetics. This study presents a promising approach for rationalizing heterogeneous electrocatalysts with exceptional performance.

Electrolysis of Seawater: An Effective Path to Sustainable Hydrogen Production with Sulfur-Doped NiFe LDH/MXene@NF Electrodes

“…Figure f reveals that the LSV curve of the CV after 2000 cycles is consistent with the previous one, indicating good stability in an alkaline environment. The catalytic activity of OER and HER in S-NiFe LDH/MXene@NF is superior to that of other MXene composites that have been reported (Figure h). ,,,− …”

Renewable Energy Potentials and Roadmap in Brazil, Austria, and Germany

“…One critical aspect in advancing hydrogen storage technology is the development of highly effective electrocatalysts capable of facilitating both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) during water electrolysis [120]. These electrocatalysts play a crucial role in enhancing the efficiency and stability of electrochemical water splitting processes, which are integral to hydrogen production at scale [121].…”

Three-Dimensional Network of Highly Uniform Cobalt Oxide Microspheres/MXene Composite as a High-Performance Electrocatalyst in Hydrogen Evolution Reaction

“…So far, there has been significant research conducted on Pt-based materials as electrocatalysts for the HER, mostly due to their advantageous characteristics such as little overpotential and a low Tafel slope. , Nevertheless, the limited availability, exorbitant expenses, and challenges pertaining to durability in the electrolyte during the process of electrolysis significantly constrain their potential for widespread commercial use. The worldwide scalability of possible clean-energy solutions might be achieved by using earth-abundant minerals as substitutes for Pt-based electrocatalysts. ,, Several first-row transition-metal compounds, such as oxides, sulfides, and phosphides, have recently gained attention as promising electrocatalysts for water splitting. − However, achieving further improvements in their electrochemical activity and durability through rational design and preparation techniques remains a challenging task . Due to its affordable cost, excellent redox capability, and relatively effective resistance to corrosion in alkaline environments, spinel Co 3 O 4 demonstrates potential as a viable alternative to noble-metal-based electrocatalysts. − Nevertheless, these materials continue to exhibit drawbacks such as limited active surface area and inadequate intrinsic conductivity.…”