4.7 Article

Pd-based bimetallic electrocatalysts for hydrogen oxidation reaction in acidic medium

Journal

JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 928, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2022.117008

Keywords

Hydrogen oxidation reaction (HOR); Pd; Bimetallic electrocatalysts; Acidic medium; Rotating disk electrode (RDE)

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A series of bimetallic and monometallic electrocatalysts were prepared and tested for their hydrogen oxidation reaction activity. Among the Pd-based electrocatalysts, 7.5 wt% Pd-2.5 wt% Ag/C showed the highest activity, attributed to the electronic interaction between Ag and Pd. The findings have implications for improving the efficiency of hydrogen oxidation reactions.
A series of six bimetallic 10 wt% Pd-M (M: Ag, Co, Cu, Fe, Ru, Zn)/C and two monometallic 10 wt% Pd/C and 10 wt% Pt/C electrocatalysts were prepared via the wet impregnation method, physicochemically character-ized and electrochemically tested in the form of thin films towards their hydrogen oxidation reaction (HOR) activity in 0.1 M HClO4 at room temperature, using the rotating disk electrode (RDE) technique. 7.5 wt% Pd-2.5 wt% Ag/C was the most active among the Pd-based electrocatalysts, although less active than 10 wt % Pt/C, whereas 7.5 wt% Pd-2.5 wt% Cu/C and 7.5 wt% Pd-2.5 wt% Fe/C exhibited the lowest activity. The superiority of 7.5 wt% Pd-2.5 wt% Ag/C was mainly attributed to the electronic interaction between Ag and Pd on the electrocatalytic surface, which alters the chemisorptive properties of the active metal phase favorably for the HOR.

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