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Boosting PEMWE Performance Via the Local Electronic Regulation of Ir0.5Ru0.5/NbN Catalyst With Synergistic Vacancy and a Doping Engineering Strategy
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DOI：10.1002/smtd.70864.png)
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Abstract
En 中文
Proton exchange membrane water electrolysis (PEMWE) is an environmentally friendly and efficient technology for hydrogen production, playing a vital role in mitigating the fossil energy crisis and bridging renewable energy generation with hydrogen utilization. This work investigates an Ir0.5Ru0.5 nanocluster supported on the nitrogen-vacation-rich niobium nitride (Ir0.5Ru0.5/NbN) for acidic oxygen evolution reaction (OER). Through defect engineering, the electron cloud density of Ir0.5Ru0.5 active sites is precisely modulated, thereby reinforcing strong metal-support interaction (SMSI) at interfaces. Concomitantly, Ir0.5Ru0.5 nanoclusters with high-density grain boundaries induce local charge rearrangement and orbital hybridization for precise d-band center downshift, are fabricated via a doping strategy, thereby accelerating the intrinsic reaction kinetics of OER. The Ir0.5Ru0.5/NbN catalyst exhibits excellent OER performance, achieving a low overpotential of 228 mV at 10 mA cm−2 and high stability, maintaining activity for 700 h without degradation. In addition, it presents outstanding performance as an anode in PEMWE with a cell voltage of 1.79 V at 2 A cm−2. This work provides a viable and efficient approach to reduce Ir loading in PEMWE dramatically, offering a prospective strategy for the cost-effective generation of green hydrogen.
Keywords:
electrocatalysts
Ir0.5Ru0.5/NbN
low-Ir-loaded catalyst
oxygen evolution reaction
proton exchange membrane water electrolysis
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9.1
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4.2K
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2.2W
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