The synergistic effect of Hf-O-Ru bonds and oxygen vacancies in Ru/HfO2 for enhanced hydrogen evolution

Guangkai Li, Haeseong Jang, Shangguo Liu, Zijian Li, Min Gyu Kim, Qing Qin (), Xien Liu () and Jaephil Cho ()
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Guangkai Li: Qingdao University of Science and Technology
Haeseong Jang: Ulsan National Institute of Science and Technology (UNIST)
Shangguo Liu: Qingdao University of Science and Technology
Zijian Li: City University of Hong Kong
Min Gyu Kim: Beamline Research Division, Pohang Accelerator Laboratory (PAL)
Qing Qin: Qingdao University of Science and Technology
Xien Liu: Qingdao University of Science and Technology
Jaephil Cho: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Ru nanoparticles have been demonstrated to be highly active electrocatalysts for the hydrogen evolution reaction (HER). At present, most of Ru nanoparticles-based HER electrocatalysts with high activity are supported by heteroatom-doped carbon substrates. Few metal oxides with large band gap (more than 5 eV) as the substrates of Ru nanoparticles are employed for the HER. By using large band gap metal oxides substrates, we can distinguish the contribution of Ru nanoparticles from the substrates. Here, a highly efficient Ru/HfO2 composite is developed by tuning numbers of Ru-O-Hf bonds and oxygen vacancies, resulting in a 20-fold enhancement in mass activity over commercial Pt/C in an alkaline medium. Density functional theory (DFT) calculations reveal that strong metal-support interaction via Ru-O-Hf bonds and the oxygen vacancies in the supported Ru samples synergistically lower the energy barrier for water dissociation to improve catalytic activities.

Date: 2022
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DOI: 10.1038/s41467-022-28947-9

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