Pd-Ir alloy electrocatalysts for hydrogen oxidation reaction in fuel cells

Pd-Ir alloy electrocatalysts for hydrogen oxidation reaction in fuel cells
fuel cell; hydrogen oxidation reactions; Pd-Ir catalysts
Issue Date
ACS, 244th American Chemical Sociey National Meeitng
Fuel cells, which directly convert chemical energy into electrical energy, are promising and worthy candidates for high efficiency and low emission energy conversion devices in mobile, stationary and portable application sectors and are expected to be one of the major clean energy sources in the near future.1 Despite important advancement in fuel cells investigation, there is the major impediment to the large-scale production and commercialization of such applications, as follows: the decreased catalytic activity by long-term operation, the high cost the electrocatalyst (Pt) required, and the deficiency of kinetic mechanisms on the electrocatalytic surface, which are the urgent issues to be addressed since they determine the efficiency and the cost of this energy source.2-4 In this study, a new approach was developed for designing electrocatalysts for hydrogen oxidation reaction in fuel cells. These electrocatalysts consist of Pd (adsorbed spontaneously H2 gas)-based alloy materials. The correlation of the volcano types were achieved for the first time between the catalytic activity (represented by exchange current density) and the d-band center measured by high-resolution x-ray photoemission spectroscopy (HR-XPS) or d-band vacancy measured by in situ x-ray absorption near edge spectroscopy (XANES). The most promising electrocatalysts based Pd was affected by Pd spontaneously absorbed hydrogen.
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