J. Mater. Sci. Technol. ›› 2025, Vol. 212: 173-181.DOI: 10.1016/j.jmst.2024.06.013

• Research Article • Previous Articles     Next Articles

Enhanced hydrogen evolution in neutral media via proximity effect of Ru/RuO2-TiO2 nanocatalysts

Yifan Yang, Lixiong Xu, Chenyue Li, Rongqian Ning, Jun Ma, Mengqin Yao, Shuo Geng*, Fei Liu   

  1. Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou 550025, China
  • Received:2024-04-23 Revised:2024-06-04 Accepted:2024-06-12 Published:2025-03-20 Online:2025-03-14
  • Contact: *E-mail address: sgeng@gzu.edu.cn (S. Geng)

Abstract: Ru-based nanomaterials have been demonstrated to be highly active electrocatalysts for hydrogen evo-lution reaction (HER), yet weak water adsorption and splitting ability in neutral media thus it is rather difficult for the intermediates to adsorb on the active site. Herein, we introduce a concept of the prox-imity effect, com prising adjacent Ru and RuO2 nanoparticles coupled on TiO2 (Ru/RuO2 -TiO2), for the synergic promotion of water molecule adsorption and splitting, significantly enhancing HER electrocatal-ysis performance. The in-situ spectroscopy experiments and density function theory (DFT) simulations demonstrated that the proximity effect between the adjacent Ru nanoparticles and RuO2 nanoparticles can accelerate water adsorption and splitting. As a result, the as-made Ru/RuO2-TiO2 only need overpo-tentials of 52.7, 16.0, and 16.4 mV to achieve the current density of 10 mA cm-2 in neutral, acid, and alkaline media, respectively. The mass activity of Ru/RuO2-TiO2 in neutral media is 320 and 117 times higher than that of commercial Ru/C and Pt/C at the overpotential of 100 mV, respectively. This work emphasizes the proximity effect for activation of reactants which can be extended to other electrocat-alytic reactions.

Key words: Hydrogen evolution reaction, Water activation, Proximity effect, Ruthenium