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- W3042745957 abstract "We have designed and constructed a quick operando ambient pressure hard X-ray photoelectron spectroscopy (HAXPES) measurement system for the investigations of reaction kinetics in electrochemical cells under working conditions. The HAXPES measurements can be performed at typical pressures of 1 × 104 Pa (maximum 1 × 105 Pa) with the maximum time resolution of ∼200 ms. To accumulate time-resolved spectra with sufficient signal-to-noise ratios, repeated cycles of the chemical reactions are conducted based on the repeated-cycle time-tagged method, requiring the identity of each event and the time trigger. As demonstrative experiments, we have successfully observed time-resolved operando Pt 3d5/2 and S 1s HAXPES from the Pt/C cathode catalyst of polymer electrolyte fuel cells. In the Pt 3d5/2 HAXPES, we have evaluated the reaction kinetics of the Pt oxidation/reduction processes at the cathode upon abrupt change of the cathode–anode bias voltage between 0.4 and 1.2 V. In the S 1s HAXPES for measurements of S species poisoning fuel cells, we have studied the contaminated anionic S adsorption and desorption kinetics on the Pt nanoparticles at the cathode. The results are comparatively discussed with previous findings." @default.
- W3042745957 created "2020-07-23" @default.
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- W3042745957 date "2020-07-16" @default.
- W3042745957 modified "2023-10-14" @default.
- W3042745957 title "Quick Operando Ambient Pressure Hard X-ray Photoelectron Spectroscopy for Reaction Kinetic Measurements of Polymer Electrolyte Fuel Cells" @default.
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- W3042745957 doi "https://doi.org/10.1021/acs.jpcc.0c04871" @default.
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