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Updated: Apr 16, 2026

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Dual-Site Synergy in PtRuFeCoNi High-Entropy Alloys: Mitigating OH*/H* Adsorption Competition for Efficient Alkaline
Jie Mu1, Li An1, Wenning Liu1
1State Key Laboratory of Materials Low-Carbon Recycling, Department of Chemistry, Institute of Hydrogen Energy Daxing, Beijing University of Technology, Beijing, P. R. China.
Abstract:
The competitive adsorption between H* and OH* on single active sites is a long-standing bottleneck limiting alkaline hydrogen evolution reaction (HER) kinetics. Herein, we integrate "multi-element electronic regulation" with "dual-site functional partitioning" in a PtRuFeCoNi high-entropy alloy (HEA) electrocatalyst, which is synthesized via high-entropy engineering strategy. Driven by electronegativity differences among Pt, Ru, Fe, Co, and Ni, spontaneous electron transfer precisely modulates their d-band centers of Pt and Ru. This electronic regulation results in that Pt sites activate H2O and adsorb OH*, while Ru sites optimize H* adsorption free energy to -0.18 eV for selective H* stabilization. Operando EPR directly captures ·H's "generation-stabilization-conversion" dynamics, filling the characterization gap. Complemented by in situ Raman and FTIR, the dual-site mechanism is validated. PtRuFeCoNi/catalyst exhibits an ultra-low overpotential of 5.2 mV at 10 mA cm-2, a Tafel slope of 45.6 mV dec-1, and 150 h stability in 1 M KOH. For overall water splitting, it achieves 10 mA cm-2 at 1.41 V, outperforming Pt/C||RuO2. This work establishes a new paradigm for resolving intermediate adsorption competition in multi-electron transfer reactions.
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