Architecting the High‐Entropy Oxides on 2D MXene Nanosheets by Rapid Microwave‐Heating Strategy with Robust Photoelectrochemical Oxygen Evolution Performance

Abstract

High‐entropy oxides (HEO) have recently concerned interest as the most promising electrocatalytic materials for oxygen evolution reactions (OER). In this work, a new strategy to the synthesis of HEO nanostructures on Ti3C2Tx MXene via rapid microwave heating and subsequent calcination at a low temperature is reported. Furthermore, the influence of HEO loading on Ti3C2Tx MXene is investigated toward OER performance with and without visible‐light illumination in an alkaline medium. The obtained HEO/Ti3C2Tx‐0.5 hybrid exhibited an outstanding photoelectrochemical OER ability with a low overpotential of 331 mV at 10 mA cm−2 and a small Tafel slope of 71 mV dec−1, which exceeded that of a commercial IrO2 catalyst (340 mV at 10 mA cm−2). In particular, the fabricated water electrolyzer with the HEO/Ti3C2Tx‐0.5 hybrid as anode required a less potential of 1.62 V at 10 mA cm−2 under visible‐light illumination. Owing to the strong synergistic interaction between the HEO and Ti3C2Tx MXene, the HEO/Ti3C2Tx hybrid has a great electrochemical surface area, many metal active sites, high conductivity, and fast reaction kinetics, resulting in an excellent OER performance. This study offers an efficient strategy for synthesizing HEO‐based materials with high OER performance to produce high‐value hydrogen fuel.

Progress in MXene‐based catalysts for oxygen evolution reaction

“…They also pointed out that a small amount of MXene can be more favorable for OER activity. Park et al 63 designed a composite composed of high-entropy oxide (HEO) and MXene via microwave treatment followed by low-temperature calcination (Figure 6A). The HEO was composed of V, Mn, Co, Fe, and Nibased oxides and acted as the active phase for OER.…”

Revealing the Impact of Pulsed Laser-Produced Single-Pd Nanoparticles on a Bimetallic NiCo2O4 Electrocatalyst for Energy-Saving Hydrogen Production via Hybrid Water Electrolysis

“…Rapidly increasing energy demand and the global climate change owing to the copious use of fossil fuels have forced us to explore eco-friendly and renewable energy sources. − Hydrogen (H 2 ) has received tremendous attention as a very important future energy carrier to replace current fossil fuels because of its excellent energy density, renewability, and zero-carbon emission. − Currently, large-scale H 2 production relies on steam–methane reforming, which utilizes methane to generate H 2 by reacting with steam. , However, this process is dependent on fossil fuels and also contributes to environmental pollution through CO 2 emissions. Therefore, the current focus of research and development worldwide is to primarily explore the efficient and clean technology for the large-scale production of H 2 . , Over the past several decades, H 2 production through electrocatalytic overall water splitting (OWS) has garnered extensive attention as an effective technology.…”

An ammonium vanadate/MXene nanocomposite for high-performance ammonium ion storage

“…21–25 MXenes possess excellent properties such as high metallic conductivity (6000–8000 S cm −1 ) and appreciable thermal conductivity, solvated ion intercalation property, variable surface functional groups, and larger hydrophilicity. 26–28 Hence, a combination of MXene and NVO could improve the electrical conductivity, hydrophilicity, and surface charge properties for ammonium-ion-based charge storage electrodes.…”