title: Overall Photoelectrochemical Water Splitting using Tandem Cell under Simulated Sunlight.
abstract: A stand-alone photoelectrochemical (PEC) water-splitting system driven only by sunlight was demonstrated with a tandem-scheme of Pt/CdS/CuGa3 Se5 /(Ag,Cu)GaSe2 photocathode and NiOOH/FeOOH/Mo:BiVO4 photoanode in a neutral phosphate buffer solution as an electrolyte. The as-prepared semi-transparent Mo:BiVO4 layer allows sunlight to pass through the top photoanode and reach the bottom photocathode. Consequently, the tandem cell showed stoichiometric hydrogen and oxygen evolution with a solar-to-hydrogen (STH) conversion efficiency of 0.67 % over 2 h without degradation. The stability and STH efficiency are the highest among similar configuration of PEC tandem cells.
authors.affiliation: School of Environmental Science&Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, South Korea.
authors.forename: Jin Hyun
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kaneko
authors.affiliation: Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Minegishi
authors.affiliation: Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Kubota
authors.affiliation: Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan. domen@chemsys.t.u-tokyo.ac.jp.
authors.forename: Kazunari
authors.initials: K
authors.lastname: Domen
authors.affiliation: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, South Korea. jlee1234@unist.ac.kr.
authors.forename: Jae Sung
authors.initials: JS
authors.lastname: Lee
mesh_terms: D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D006859:Hydrogen / Q000737:chemistry; D008027:Light; D008956:Models, Chemical; D010100:Oxygen / Q000737:chemistry; D055668:Photochemical Processes; D013472:Sunlight; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D006859:Hydrogen; D010100:Oxygen
keywords: photoelectrochemical cell; photoelectrodes; solar-to-hydrogen; tandem cell; water splitting