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The Raman spectra of the powder catalysts had been measured either on a Horiba XploRA or a Renishaw In By way of Qontor Raman spectrometer. The in situ electrochemical Raman spectroscopy was performed on a Horiba XploRA Raman spectrometer equipped with a 60× waterproof objective and a 638 nm laser. In the in situ measurements, a homemade electrochemical cell, equipped with a saturated Ag/AgCl reference electrode and a Pt wire counter electrode, was utilised. The spectra have been collected at…