Fiber-in-tube RuxCr1−xOy as highly efficient electrocatalysts for pH-universal water oxidation via facile bubble desorption
Literature Information
Chaewon Song, Dasol Jin, Subin Choi, Youngmi Lee
Electrospun RuxCr1−xOy nanomaterials were produced using an electrospinning technique followed by a thermal annealing process under oxidative atmospheric conditions. The morphology of the materials was controlled by adjusting the atmospheric O2 concentration during calcination, resulting in various shapes, including core–shell structures and nanofibers. The electrocatalytic activity of RuxCr1−xOy nanomaterials for the oxygen evolution reaction (OER) was assessed with voltammetry under various pH conditions. Specifically, RuxCr1−xOy_20 nanofibers (synthesized in a calcination environment composed of 20% oxygen and 80% helium gases), featuring a fiber-in-tube structure, exhibited the lowest potentials (V vs. RHE) at 10 mA cm−2, reaching 1.47 V under alkaline, 1.49 V under neutral, and 1.44 V under acidic conditions. Furthermore, these nanomaterials displayed the smallest Tafel slopes of 37.5 mV dec−1 in alkaline, 68.9 mV dec−1 in neutral, and 40.8 mV dec−1 in acidic environments. These results clearly indicate the superior OER activity of RuxCr1−xOy_20 in comparison to that of commercial Ir (Ir/C), pure RuOx (Ru/RuO2), and Ru-based electrocatalysts reported in the literature. Additionally, it displayed remarkable stability over 20 h continuous chronopotentiometry tests across all pH ranges and facilitated the desorption of oxygen bubbles generated during the OER process, leading to improved OER activity. The unique core–shell structure of RuxCr1−xOy_20, which dilutes expensive Ru with cheap Cr, presents excellent feasibility as a practical and cost-effective OER catalyst, especially considering the scarcity of pH-universal OER catalysts reported.
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