Manganese doped NiBP: A promising electrocatalyst for sustainable hydrogen production at high-current-density (HCD)

Exploring non-precious metal-based electrocatalysts with superior electrocatalytic performance and stability can be crucial for green hydrogen generation to achieve carbon neutrality and address energy demands. Herein, Mndoped NiBP microsphere electrocatalyst is synthesized by combining hydrothermal and electrochemical deposition. The Mn/NiBP microsphere exhibits low overpotentials of 62 and 250 mV for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at 50 mA/cm2 in 1 M KOH. The Mn/NiBP (- ) || Mn/NiBP (+) demonstrates a low cell voltage of 3.07 V at 2000 mA/cm2 in 1 M KOH, suppressing the benchmark Pt/C (-) || RuO2 (+). Further, the Pt/C (- ) || Mn/NiBP (+) hybrid system exhibits an ultra-low cell voltage of 2.82 Vat 2000 mA/cm2 in 1 M KOH, indicating electrocatalytic robustness and strong anti-corrosion resistance of Mn/NiBP microspheres. Mn doping on NiBP microspheres accelerates charge transfer and enhances electrocatalytic activity, making it a cost-effective electrocatalyst candidate for industrial applications.