Exploring Zn doped NiBP microspheres as efficient and stable electrocatalyst for industrial-scale water splitting

IF 10.8 2区化学 Q1 CHEMISTRY, PHYSICAL

物理化学学报 Pub Date : 2025-03-17 DOI:10.1016/j.actphy.2025.100079

Sumiya Akter Dristy, Md Ahasan Habib, Shusen Lin, Mehedi Hasan Joni, Rutuja Mandavkar, Young-Uk Chung, Md Najibullah, Jihoon Lee

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Abstract

Green hydrogen holds great promise for the future energy ecosystem and designing alternative electrocatalysts is essential for industrial-scale green hydrogen production for high-current water splitting under industrial conditions. Herein, the Zn-doped NiBP microsphere electrocatalyst is fabricated via a multi-step process combining hydrothermal and electrochemical approaches, followed by post-annealing. The optimized Zn/NiBP electrode outperforms the majority of previously reported catalysts, with low overpotentials of 95 mV for HER (hydrogen evolution reaction) and 280 mV for OER (oxygen evolution reaction) at 100 mA cm⁻² in 1 mol L⁻¹ KOH. The bifunctional Zn/NiBP || Zn/NiBP demonstrates a 3.10 V cell voltage at 2000 mA cm⁻² in 1 mol L⁻¹ KOH, surpassing the benchmark Pt/C || RuO₂ systems. The Pt/C || Zn/NiBP hybrid system exhibits exceptionally low cell voltages of 2.50 and 2.30 V at 2000 mA cm⁻² in 1 and 6 mol L⁻¹ KOH respectively, demonstrating excellent overall water-splitting performance under challenging industrial conditions. Furthermore, the 2-E system shows remarkable stability over 120 h at 1000 mA cm⁻² in 1 and 6 mol L⁻¹ KOH, indicating the robust anti-corrosion properties of the Zn/NiBP microspheres. Zn-doped NiBP microspheres exhibit enhanced electrochemical conductivity, active surface area and intrinsic electrocatalytic activity due to synergistic interactions among Zn, Ni, B and P, enabling rapid charge transfer and superior electrocatalytic performance for efficient hydrogen generation.

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