Promoting water formation in sulphate-functionalized Ru for efficient hydrogen oxidation reaction under alkaline electrolytes.
Chaoyi YangYunbo LiJianchao YueHengjiang CongWei LuoPublished in: Chemical science (2023)
Improving the sluggish kinetics of the hydrogen oxidation reaction (HOR) under alkaline electrolytes plays a significant role in the practical application of alkaline polymer electrolyte fuel cells (APEFCs). Here we report a sulphate functionalized Ru catalyst (Ru-SO 4 ) that exhibits remarkable electrocatalytic performance and stability toward alkaline HOR, with a mass activity of 1182.2 mA mg PGM -1 , which is four-times higher than that of the pristine Ru catalyst. Theoretical calculations and experimental studies including in situ electrochemical impedance spectroscopy and in situ Raman spectroscopy demonstrate that the charge redistribution on the interface of Ru through sulphate functionalization could lead to optimized adsorption energies of hydrogen and hydroxide, together with facilitated H 2 transfer through the inter Helmholtz plane and precisely tailored interfacial water molecules, contributing to a decreased energy barrier of the water formation step and enhanced HOR performance under alkaline electrolytes.
Keyphrases
- ionic liquid
- visible light
- energy transfer
- anaerobic digestion
- raman spectroscopy
- electron transfer
- room temperature
- solid state
- reduced graphene oxide
- quantum dots
- induced apoptosis
- density functional theory
- ion batteries
- hydrogen peroxide
- aqueous solution
- gold nanoparticles
- high resolution
- molecular dynamics simulations
- computed tomography
- smoking cessation
- cell proliferation
- mass spectrometry
- signaling pathway
- single molecule
- magnetic resonance imaging
- cell cycle arrest
- monte carlo
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