In situ construction of heterostructure NiSe-NiO nanoarrays with rich oxygen vacancy on MXene for efficient oxygen evolution

摘要

Developing high-efficiency, non-noble, earth-available electrocatalysts for the oxygen evolution reaction (OER) is vital for electrochemical energy conversion, but it is still chal-lenging. Herein, we ingeniously designed a partial selenization method to construct NiSe-NiO heterostructure grown in situ on Ta4C3Tx MXene (denoted as NiSe-NiO/Ta4C3Tx MXene). NiSe-NiO/Ta4C3Tx MXene's plethora of heterointerfaces provides a wealth of active sites, fast charge and mass transfer, and favorable adsorption energies for OER in-termediates, all of which contribute synergistically to the oxidation of alkaline water. As expected, taking advantage of the strong chemical and electron synergistic effects of NiSe and NiO, the synthesized NiSe-NiO/Ta4C3Tx MXene exhibits excellent activity for OER with a low overpotential of 255 mV at 10 mA cm(-2), a small Tafel slope of 47.4 mV dec(-1), as well as excellent long-term stability, exceeding that of its competitors. This study offers a novel synthetic route toward developing high-performance OER electrocatalysts for renewable energy conversion/storage systems and beyond by optimizing the catalysts' composition and architecture. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.