Mokhamad Ali Rizqi Maulana, Setia Budi, Jumaeda Jatmika, Mohammad Hamzah Fauzi, Suci Winarsih, Akrajas Ali Umar
Cu2O is a promising material for the hydrogen evolution reaction due to the favourable band gap. However, achieving a pure Cu2O phase typically requires high deposition temperatures. To overcome this, electrolyte pH modification was employed to synthesize pure Cu2O at room temperature. A key challenge in room-temperature electrodeposition is the slow deposition rate, which can be improved through photoelectrodeposition. This study explores the synthesis of pure Cu2O via controlled pH photoelectrodeposition for applications of the hydrogen evolution reaction. The results demonstrate that Cu2O films were successfully deposited in an alkaline electrolyte, with the best hydrogen evolution reaction catalytic performance observed at pH 8. This sample exhibited a low onset potential of 64 mV with respect to the standard reversible hydrogen electrode and a Tafel slope of 46 mV/dec. These findings provide the optimization of Cu2O synthesis for hydrogen production. © The Author(s) 2025. Published by Oxford University Press on behalf of National Institute of Clean-and-Low-Carbon Energy.
The Center for Science Innovation, Arva Building, Jl. RP. Soeroso, Jakarta Pusat, 10350, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jl. Rawamangun Muka Timur, Jakarta, 13220, Indonesia; Research Center for Quantum Physics, National Research and Innovation Agency (BRIN), Building 442 Kawasan Sains dan teknologi, B.J. Habibie (Puspiptek), South Tangerang, 15314, Indonesia; Institute of Microengineering and Nanoelectronics, Research Complex, Universiti Kebangsaan Malaysia, Selangor, Bangi, 43600, Malaysia
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