Sulphur anion induced electronic structure regulation of RuO2 nanodots for efficient electrocatalytic overall water splitting

doi:10.1016/j.jmst.2024.11.074

Abstract

Abstract: Developing bifunctional electrocatalysts with enhanced efficiency for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) remains a significant challenge. Herein, we constructed S-doped ultra-fine RuO₂ nanodots that were uniformly dispersed on carbon nanotubes. The incorporation of S effectively induces local rearrangement of the electronic structure of RuO₂, thereby enhancing the dispersion of RuO₂ as active sites and optimizing the adsorption free energy of H* intermediate. As expected, the as-synthesized S-RuO₂/CNT delivers remarkable HER activity in all pH electrolytes, achieving lower overpotentials of 136, 159, and 396 mV at 100 mA cm^-2 in acidic, neutral, and basic solutions, respectively. Moreover, a unitary S-RuO₂/CNT electrolytic cell requires only a lower voltage (1.476 V) to achieve a current density of 10 mA cm^-2 in 1.0 mol/L KOH. This ingenious work represents a significant breakthrough in the rational design of bifunctional electrocatalysts, enabling remarkable performance in electrochemical water electrolysis.

Key words: RuO₂ nanodots, Electrocatalytic overall water splitting, Sulphur anion doping, Electronic structure regulation

Xi-Zheng Fan, Jing-Peng Hu, Xin Du, Zhong-Yi Liu, Xin-Zheng Yue. Sulphur anion induced electronic structure regulation of RuO₂ nanodots for efficient electrocatalytic overall water splitting[J]. J. Mater. Sci. Technol., 2025, 231: 77-85.

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Sulphur anion induced electronic structure regulation of RuO₂ nanodots for efficient electrocatalytic overall water splitting

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