2024-03-29T06:53:59Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/264142022-11-17T02:08:08Zhdl_2115_20059hdl_2115_151Hydrogen adsorption and hydrogen evolution reaction on a polycrystalline Pt electrode studied by surface-enhanced infrared absorption spectroscopyKunimatsu, KeijiSenzaki, TakahiroSamjeské, GaborTsushima, MinoruOsawa, MasatoshiElectrocatalysisHydrogen adsorptionHydrogen evolution reactionPtIR spectroscopy431.35Hydrogen evolution reaction (HER) on a polycrystalline Pt electrode has been investigated in Ar-purged acids by surface-enhanced infrared absorption spectroscopy and electrochemical kinetic analysis (Tafel plot). A vibrational mode characteristic to H atom adsorbed at atop sites (terminal H) was observed at 2080–2095 cm−1. This band appears at 0.1 V (RHE) and grows at more negative potentials in parallel to the increase in hydrogen evolution current. Good signal-to-noise ratio of the spectra enabled us to establish the quantitative relation between the band intensity (equivalently, coverage) of terminal H and the kinetics of HER, from which we conclude that terminal H atom is the reaction intermediate in HER and the recombination of two terminal H atoms is the rate-determining step. The quantitative analysis of the infrared data also revealed that the adsorption of terminal H follows the Frumkin isotherm with repulsive interaction.Elsevier Ltd.Journal Articleapplication/pdfhttp://hdl.handle.net/2115/26414https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/26414/1/ECA52-18.pdf0013-4686Electrochimica Acta5218571557242007-05-10enginfo:doi/10.1016/j.electacta.2006.12.007author