A p-type heterojunction photoelectrode consisting of platinized CuBi2O4 layered on a CuO film was prepared. The CuO|CuBi2O4|Pt electrode photo-generates H2 in pH neutral aqueous solution during visible light irradiation and exhibits a substantially enhanced photocurrent compared to CuO|Pt and CuBi2O4|Pt electrodes. Reduced electron-hole recombination by the band offsets in the heterostructure is responsible for the improved photoelectrochemical performance of CuO|CuBi2O4 with a small band-gap of approximately 1.5 eV.The work at Cambridge was supported by the Christian Doppler Research
Association (Austrian Federal Ministry of Economy, Family and Youth
and National Foundation for Research, Technology and Development),
the OMV Group the EPSRC (EP/H00338X/2) and BBSRC
(BB/K010220/1).This is the accepted manuscript version. The final published version is available from the RSC at http://pubs.rsc.org/en/Content/ArticleLanding/2014/CP/C4CP03883E#!divAbstract
