Rational Design and Dynamic Ru Exsolution Enables Active Heterostructures Surpassing Pt for Alkaline Hydrogen Evolution

作者：Liuchen Wang, Bing Li, Mingyu Li, Yuxuan Zhang, Tenghui Yuan, Yong Ding, Tongtong Li, Chaoxia Peng, Simin Jiang, Xunhui Xiong, Linjuan Zhang, Enzuo Liu, Meilin Liu, Bote Zhao · 发表于：Journal of the American Chemical Society · 年份：2025 · DOI：10.1021/jacs.5c16183 · 被引用次数：12 · 研究领域：Electrocatalysts for Energy Conversion、Ammonia Synthesis and Nitrogen Reduction、Advanced battery technologies research

High Resolution Image Download MS PowerPoint Slide Accelerating the hydrogen evolution reaction (HER) is essential for improving water electrolysis efficiency with renewable energy, ensuring a sustainable hydrogen economy. Heterostructure catalysts show promise in significantly enhancing alkaline HER by facilitating both water dissociation and hydrogen generation, but the rational design and synthesis of robust and active heterostructures remains challenging. Here, we correlate the bias-driven dynamic surface reconstruction of ruthenate perovskites with their O 2 p band center to design exsolved Ru/perovskite heterostructures for highly efficient alkaline HER. BaRuO 3 is used as a model because its O 2 p band center is closest to the Fermi level, allowing facile surface reconstruction under HER conditions. This results in exsolved Ru on BaRuO 3 with rich oxygen vacancies, as confirmed by microscopy and spectroscopy, including in situ Ru exsolution over time under transmission electron microscopy observation. The target heterostructure shows approximately 120-fold enhancement in HER activity after surface reconstruction, with a mass activity of ∼ 1.68 times higher than commercial Pt/C at an overpotential of 80 mV. We reveal that perovskite oxides facilitate water dissociation and the exsolved Ru promotes hydrogen generation. Moreover, this bias-driven dynamic reconstruction strategy is applicable to other perovskite oxides. These findings provide guidelines for the rational de...