title: Wireless Solar Water Splitting Device with Robust Cobalt-Catalyzed, Dual-Doped BiVO4 Photoanode and Perovskite Solar Cell in Tandem: A Dual Absorber Artificial Leaf.
abstract: A stand-alone, wireless solar water splitting device without external energy supply has been realized by combining in tandem a CH3NH3PbI3 perovskite single junction solar cell with a cobalt carbonate (Co-Ci)-catalyzed, extrinsic/intrinsic dual-doped BiVO4 (hydrogen-treated and 3 at% Mo-doped). The photoanode recorded one of the highest photoelectrochemical water oxidation activity (4.8 mA/cm(2) at 1.23 VRHE) under simulated 1 sun illumination. The oxygen evolution Co-Ci co-catalyst showed similar performance to best known cobalt phosphate (Co-Pi) (5.0 mA/cm(2) at 1.23 VRHE) on the same dual-doped BiVO4 photoanode, but with significantly better stability. A tandem artificial-leaf-type device produced stoichiometric hydrogen and oxygen with an average solar-to-hydrogen efficiency of 4.3% (wired), 3.0% (wireless) under simulated 1 sun illumination. Hence, our device based on a D4 tandem photoelectrochemical cell represents a meaningful advancement in performance and cost over the device based on a triple-junction solar cell-electrocatalyst combination.
authors.affiliation: School of Environmental Science & Engineering, Department of Chemical 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: KIER-UNIST Advanced Center for Energy, Korea Institute of Energy Research , Ulsan, 689-798 South Korea.
authors.forename: Yimhyun
authors.initials: Y
authors.lastname: Jo
authors.affiliation: School of Environmental Science & Engineering, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, 790-784 South Korea.
authors.forename: Ju Hun
authors.initials: JH
authors.lastname: Kim
authors.affiliation: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan, 689-798 South Korea.
authors.forename: Ji Wook
authors.initials: JW
authors.lastname: Jang
authors.affiliation: School of Environmental Science & Engineering, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, 790-784 South Korea.
authors.forename: Hyun Jun
authors.initials: HJ
authors.lastname: Kang
authors.affiliation: School of Environmental Science & Engineering, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH) , Pohang, 790-784 South Korea.
authors.forename: Young Hye
authors.initials: YH
authors.lastname: Lee
authors.affiliation: KIER-UNIST Advanced Center for Energy, Korea Institute of Energy Research , Ulsan, 689-798 South Korea.
authors.forename: Dong Suk
authors.initials: DS
authors.lastname: Kim
authors.affiliation: Department of Materials Chemistry and Engineering, School of Energy and Chemical Engineering, Konkuk University , Seoul, 143-701 South Korea.
authors.forename: Yongseok
authors.initials: Y
authors.lastname: Jun
authors.affiliation: School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan, 689-798 South Korea.
authors.forename: Jae Sung
authors.initials: JS
authors.lastname: Lee
keywords: BiVO4; artificial leaf; cobalt carbonate; dual doping; perovskite solar cell; tandem cell