Fabrication of heterojunction electrode based on Fe₂O₃@CuO-400 nanocomposite constructed for hydrogen production

The green hydrogen production via water splitting is a highly promising method for eventual fossil fuel replacement, which causes many harmful products. Water electrolysis is one particularly dependable method of bridging primary renewable energy with stable hydrogen energy. In this study, the Fe₂O₃@CuO-400 is fabricated via simple hydrothermal process and is employed for green hydrogen production. The structure-engineered Fe₂O₃@CuO-400 exhibits enhanced activity, achieving a lower overpotential of 130 mV during 10 mA cm⁻² and a smaller Tafel slope of 77 mV/dec for hydrogen evolution reaction. Conversely, the Fe₂O₃@CuO-400 nanocomposite exhibits 230 mV of overpotential & 54 mV/dec of Tafel slope for OER. The electronic interaction between Fe₂O₃ and CuO inside the heterojunction adjusted the electrical configuration between Cu and Fe improving the kinetics of the reaction, which enhanced the efficiency of hydrogen production. Hence, this study proposes a new avenue for producing heterostructure-based catalysts, which are beneficial for electrochemical applications in future.