Reversible hydrogen spillover in Ru-WO₃₋ₓ enhances hydrogen evolution activity in neutral pH water splitting

Reversible hydrogen spillover in Ru-WO₃₋ₓ enhances hydrogen evolution activity in neutral pH water splitting

Noble metal electrocatalysts (e.g., Pt, Ru, etc.) suffer from sluggish kinetics of water dissociation for the electrochemical reduction of water to molecular hydrogen in alkaline and neutral pH environments. Herein, we found that an integration of Ru nanoparticles (NPs) on oxygen-deficient WO3-x man...

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Bibliographic Details
Main Authors: Chen, Jiadong, Chen, Chunhong, Qin, Minkai, Li, Ben, Lin, Binbin, Mao, Qing, Yang, Hongbin, Liu, Bin, Wang, Yong
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2023
Subjects:
Engineering::Chemical engineering
Electrokinesis
Hydrogen
Online Access:https://hdl.handle.net/10356/168656
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Institution: Nanyang Technological University
Language: English
Description
Summary:Noble metal electrocatalysts (e.g., Pt, Ru, etc.) suffer from sluggish kinetics of water dissociation for the electrochemical reduction of water to molecular hydrogen in alkaline and neutral pH environments. Herein, we found that an integration of Ru nanoparticles (NPs) on oxygen-deficient WO3-x manifested a 24.0-fold increase in hydrogen evolution reaction (HER) activity compared with commercial Ru/C electrocatalyst in neutral electrolyte. Oxygen-deficient WO3-x is shown to possess large capacity for storing protons, which could be transferred to the Ru NPs under cathodic potential. This significantly increases the hydrogen coverage on the surface of Ru NPs in HER and thus changes the rate-determining step of HER on Ru from water dissociation to hydrogen recombination.

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