Key Takeaways & Executive Findings
- •• • Under a current density of 1 A cm−2, the Ta-doped RuO2 catalyst achieved a cell voltage of 1.704 V with a degradation rate of only 14 μV h−1, demonstrating exceptional stability for industrial PEM electrolysis. • • Tantalum incorporation suppressed the formation of high-valence RuO4 phases and reduced changes in the cathodic charge (q* cathodic), as confirmed by in situ Raman spectroscopy, thereby mitigating the primary corrosion pathway of RuO2. • • Quantum mechanical calculations using the grand canonical quantum mechanics (GCQM) method showed that Ta preferentially deposits on Ru(100) surface substituting unsaturated coordination sites (CUS) and occupies bridge sites on Ru(110), enhancing intrinsic activity and stability. • • Kilogram-scale production of TaRuOx was achieved via a sol-gel method, enabling large-scale photovoltaic water electrolysis tests, which validates the scalability and industrial viability of the catalyst synthesis.
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Abstract
Proton exchange membrane water electrolysis (PEM-WE) is a pivotal technology for sustainable hydrogen production, yet its efficiency is constrained by the sluggish kinetics and instability of the oxygen evolution reaction (OER) under acidic conditions. RuO2, despite its high activity and lower cost relative to Ir-based catalysts, suffers from severe corrosion and dissolution, limiting its practical lifespan. This highlight examines the work by Zhang, Fu, Kwon, and coworkers, who combined single-crystal thin film studies with theoretical calculations to elucidate the corrosion mechanisms of Ru-based catalysts. By introducing tantalum via magnetron sputtering, they achieved significant improvements in both catalytic activity and structural stability. The Ta-doped RuO2 films exhibited suppressed formation of high-valence Ru phases and reduced changes in electrochemical surface area. Quantum mechanical calculations revealed that Ta preferentially occupies unsaturated coordination sites on Ru(100) and bridge sites on Ru(110), enhancing intrinsic stability. Kilogram-scale production of TaRuOx was realized through a sol-gel method, and large-scale photovoltaic water electrolysis tests demonstrated a cell voltage of 1.704 V at 1 A cm−2 with a degradation rate as low as 14 μV h−1. This work exemplifies a comprehensive innovation chain from mechanistic understanding to industrial validation, accelerating the deployment of green hydrogen production.
1. Introduction
Proton exchange membrane water electrolysis (PEM-WE) offers a promising route for sustainable hydrogen production, particularly when coupled with renewable power sources. However, the oxygen evolution reaction (OER) under acidic conditions remains a bottleneck due to its slow kinetics and reliance on expensive and scarce iridium-based catalysts. RuO2 has emerged as a potential alternative owing to its lower cost and higher activity, but its poor intrinsic stability leads to rapid dissolution and short operational lifetimes, hindering commercial deployment.
To address this stability challenge, Zhang, Fu, Kwon, and coworkers conducted a comprehensive study combining single-crystal thin film experiments and theoretical calculations to uncover the corrosion mechanisms of Ru-based catalysts. They introduced tantalum into RuO2 films via magnetron sputtering, which significantly improved both catalytic activity and structural stability. The tantalum doping suppressed the formation of high-valence Ru phases and reduced changes in the electrochemical surface area. Quantum mechanical calculations provided atomic-level insights into the stabilization effect. The team further scaled up the synthesis using a sol-gel method to produce kilogram quantities of TaRuOx and demonstrated its performance in large-scale photovoltaic water electrolysis, achieving a cell voltage of 1.704 V at 1 A cm−2 with a degradation rate of 14 μV h−1. This work represents a significant step toward industrial application of Ru-based catalysts for green hydrogen production.
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Jiaqi Zhang, Chen Chen (2025). Tantalum-Doped RuO2: From Laboratory Insights to Industrial-Grade PEM Catalysts. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3287-0
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Frequently Asked Questions
What is the degradation rate of the Ta-doped RuO2 catalyst under industrial operating conditions?
The Ta-doped RuO2 catalyst exhibited a degradation rate of 14 μV h−1 at a current density of 1 A cm−2, which is significantly lower than that of undoped RuO2, indicating enhanced stability for long-term operation.
How does tantalum incorporation modify the surface structure of RuO2 to improve stability?
Tantalum preferentially deposits on the Ru(100) surface, substituting unsaturated coordination sites (CUS), and occupies bridge sites on the Ru(110) facet. This suppresses the formation of high-valence RuO4 phases and reduces changes in the electrochemical surface area, as confirmed by in situ Raman spectroscopy and quantum mechanical calculations.
Is the synthesis method scalable for industrial production?
Yes, the authors achieved kilogram-scale production of TaRuOx using a sol-gel method, and successfully demonstrated large-scale photovoltaic water electrolysis tests, validating the scalability of the synthesis process.
What cell voltage was achieved in the large-scale electrolysis test?
The large-scale photovoltaic water electrolysis test achieved a cell voltage of 1.704 V at a current density of 1 A cm−2, demonstrating high efficiency and potential for industrial application.
What are the key mechanistic insights from the single-crystal thin film studies?
The single-crystal thin film studies revealed that the corrosion of RuO2 under OER conditions is structure-dependent, with early-stage corrosion enhancing OER activity through surface reconstruction and increased active sites. However, the high dissolution rate of Ru leads to rapid catalyst failure. Tantalum doping mitigates this by stabilizing the surface and reducing the formation of soluble high-valence Ru species.
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