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In-situ engineered RuTiOx nanorods for synergistic AEM-LOM pathways enabling overall water splitting
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DOI：10.1016/j.scib.2026.04.065.png)
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Abstract
En 中文
Exploring efficient bifunctional catalysts for pH-universal water splitting is pivotal for sustainable hydrogen production. This study reports the in-situ synthesis of RuTiOx nanorods on Ti mesh (RuTiOx@TM) as a self-supported bifunctional electrocatalyst. The nanorod architecture maximized active site exposure, while strategic oxygen vacancies promoted electron transfer and triggered lattice oxygen activation. Combined experimental and theoretical analyses revealed a synergistic adsorbate evolution mechanism (AEM) and the lattice oxygen mechanism (LOM). RuTiOx@TM exhibited excellent bifunctional performance with low overpotentials of 248 mV for oxygen evolution reaction (OER) and 46 mV for hydrogen evolution reaction (HER) at 10 mA cm−2 in 0.5 mol L−1 H2SO4, maintaining operational stability for 400 h. Notably, this performance persisted across a wide pH range, underscoring its potential for practical water splitting applications. In a two-electrode configuration, RuTiOx@TM||RuTiOx@TM sustained stable operation for 100 h at 50 and 300 mA cm−2. In a proton exchange membrane (PEM) electrolyzer, the catalyst maintained continuous operation for 200 h at 300 mA cm−2, with an estimated electricity-cost-based hydrogen production cost of US$1.02 kg−1. These results demonstrate a significant advance in electrocatalytic efficiency and pave the way for scalable, pH-universal water splitting technologies.
Keywords:
RuTiOx nanorods
bifunctional electrocatalyst
oxygen evolution reaction
hydrogen evolution reaction
pH-universal water splitting
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