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We have developed a flow cell for the operando X-ray absorption spectroscopy of CO
2
RR, providing an identical catalytic environment as that of the electrochemical measurement. Two model catalysts, metallic copper and copper hydroxide, are investigated. These catalysts undergo a remarkable reduction to the metallic state in the flow cell during CO
2
RR.
Operando XAS reveals that the copper catalysts undergo a remarkable reduction to the metallic state during CO
2
RR.