Electrical Double Layer Effects on Alkaline Hydrogen Reactions on Platinum.

ABSTRACT: Alkali metal cations (AM⁺) and hydroxide anions (OH^-) intricately influence Pt-catalyzed hydrogen evolution and oxidation reactions (HER/HOR) in alkaline media, a topic of ongoing debate. Here, we systematically investigate their effects using twenty-eight electrolytes with independently varied Na⁺ and OH^- concentrations ranging from 0.001 to 1.0 M. Our studies reveal a strong correlation between electrical double layer (EDL) thickness and HER/HOR rates. Increasing the OH^- concentration positively shifts the potential of zero free charge and enhances the negative surface charge on Pt within the HER/HOR potential regime. This reduces the EDL thickness, strengthens interfacial electric fields, and facilitates water dissociation during HE

SUBMITTER: Wang S 

PROVIDER: S-EPMC12569947 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature