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In situ ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) combined with resistivity measurement was performed for a Pt thin-film H2 gas sensor. We experimentally demonstrate that the chemical state of the Pt surface changes under working conditions, and it directly links to the sensing performance. Moreover, the operating principle is discussed at the atomic scale.The paradigmatic electrocyclic ring opening of monosubstituted cyclobutenes has been used to diagnose possible solvation effects tuning the torquoselectivity observed i
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