Electrochemical data and results for all measurements presented in the manuscript and supporting information (chronoamperometry, linear sweep voltammetry, incident photon-to-current efficiency measurements, gas chromatography analysis), characterisation of CuCrO2 structures (scanning electron microscopy, Brunauer–Emmett–Teller gas adsorption measurements, transmission electron microscopy, X-Ray diffractommetry, UV-Vis sepctroscopy), and determination of molecular loading (UV-Vis dye desorption calibration and samples, inductively coupled plasma optical emmision spectroscopy data).