Fig. 1

a XRD patterns for the different FeCe-x catalysts (Fe:Ce molar ratio = 2:1). b Fe 2p XPS spectra for the FeCe-x catalysts and the FeCe hydroxide precursor. c UV-vis absorption spectra for the FeCe hydroxide precursor, FeCe-x catalysts and commercial CeO2. d Catalyst surface temperature for the FeCe-x catalysts and FeCe hydroxide precursor under light irradiation.