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We report, for the first time, utilizing a rotating ring‐disc electrode (RRDE) assembly for detecting changes in the local pH during aqueous CO2 reduction reaction (CO2RR). Using Au as a model catalyst where CO is the only product, we show that the CO oxidation peak shifts by −86±2 mV/pH during CO2RR, which can be used to directly quantify the change in the local pH near the catalyst surface during...
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