Fe2O3 photoanodes: Photocorrosion protection by thin SnO2 and TiO2 films

•Porous hematite layers covered by conformal ALD SnO2 and TiO2 overlayers.•The presence of the TiO2/SnO2 coatings was evidenced by XPS.•The Faradaic efficiency, f, of photocorrosion in acidic media determined.•f decreased by capping with either TiO2 or SnO2 2 nm thick overlayer.•2 nm thick SnO2 overlayer had positive influence on the long term photocurrent stability.