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Significant interest has been arisen to explore photoanodes for full optical absorption spectrums and good stability in photoelectrochemistry. Herein CdSe is used to modify Ti:Fe2O3 photoanode forming Ti:Fe2O3/CdSe heterojunction. Combining with an air annealing treatment, Ti:Fe2O3/CdSe exhibits a 6.5 times higher photocurrent density that of the pristine Ti:Fe2O3 to achieve 3.25 mA cm−2 at 1.2 V...