Citation: Sumiya Akter Dristy, Md Ahasan Habib, Mehedi Hasan Joni, Md Najibullah, Rutuja Mandavkar, Shusen Lin, Jihoon Lee. Binder-free bimetallic vanadium-nickel-boride-phosphide spherical structure for highly efficient and stable industrial-level water splitting[J]. Chinese Journal of Structural Chemistry, ;2025, 44(12): 100747. doi: 10.1016/j.cjsc.2025.100747 shu

Binder-free bimetallic vanadium-nickel-boride-phosphide spherical structure for highly efficient and stable industrial-level water splitting

The development of robust, cost-effective and high-performance electrocatalysts is essential for industrial-scale green hydrogen production under high-current operating conditions (> 500 mA/cm2) to ensure both high output and economic efficiency. Herein, a binder-free bimetallic vanadium-nickel-boride-phosphide (VNiBP) spherical electrocatalyst (SE) is synthesized via a simple hydrothermal method, followed by post-annealing. The VNiBP catalyst exhibits low overpotentials of 91 mV for the hydrogen evolution reaction (HER) and 270 mV for the oxygen evolution reaction (OER) at 100 mA/cm2 in 1 M KOH with stable operation over 150 h, surpassing most of the state-of-the-art electrocatalysts. The bifunctional VNiBP (–, +) exhibits a low turnover voltage of 1.57 V at 100 mA/cm2 and outperforms the Pt/C||RuO2 benchmark system up to 2000 mA/cm2 high-current density. The Pt/C||VNiBP hybrid configuration shows a low 2-E cell voltage of 2.55 V at 2000 mA/cm2 under industrially relevant conditions (6 M KOH, 60 °C). Notably, the VNiBP demonstrates exceptional long-term stability, maintaining continuous operation for over 6 days in both 1 M and 6 M KOH at 1000 mA/cm2. The outstanding overall water splitting (OWS) performance can be attributed to the synergistic combination of rapid intermediate formation, optimized adsorption/desorption kinetics, high electrochemical surface area and low charge transfer resistance offered by favorable composition and spherical morphology.
- Electrocatalysis,
- Multi-functional,
- HER,
- OER,
- Overall water splitting,
- Industrial stability
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