CuAl layered double hydroxide as a highly efficient electrocatalyst for the electrolysis of water into hydrogen and oxygen fuels

The production of green H2 through water electrolysis processes has become a prominent technology to deal with energy and environmental crisis worldwide. The total energy consumption of electrolysis processes can be reduced by the development of low-cost electrocatalysts. In this paper, we report first time the synthesis of a highly efficient 2D CuAl LDH electrocatalyst to produce the green H2. The electrocatalyst was characterized with the help of various analytical instruments such as FT-IR, XRD, BET, TGA, ICP-OES, and XPS. The morphological characterization was done by SEM and TEM. The electrochemical characterization such as CV, LSV, Tafel plot, and EIS was done in acidic, basic, seawater, and alkaline seawater medium. It was found that CuAl LDH electrocatalyst exhibits a good current density of 100 mA/cm2 at a potential of 1.178 V in acidic medium and 10 mA/cm2 at 1.114V in seawater medium. It was investigated that the CuAl LDH behaves as a bifunc-tional electrocatalyst and exhibits excellent HER and OER activity in an acidic medium. The effect of temperature on the efficiency of the electrocatalyst under the above electrolyte mediums was also studied. The electrochemical data suggests that the CuAl LDH electrocatalyst can be utilized in an alkaline/PEM electrolyzer to produce the green H2 at an industrial scale with optimum cost.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The production of green H2 through water electrolysis processes has been recognized as a crucial technology to address global energy and environmental crisis. This paper presents the synthesis of a highly efficient 2D CuAl LDH electrocatalyst for green H2 production. The electrocatalyst was characterized using various analytical techniques and its performance was evaluated in different electrolyte mediums. The results demonstrate that the CuAl LDH electrocatalyst exhibits excellent performance in terms of current density and bifunctional activity in acidic medium, indicating its potential for industrial-scale green H2 production.