title: Photoelectrochemical reaction for the efficient production of hydrogen and high-value-added oxidation reagents.
abstract: A porous and thick photoelectrode of WO3 in the monoclinic phase was prepared to realize the recovery of H2 and high-value-added oxidation reagents with efficient solar energy conversion. The WO3 photoelectrode enabled the efficient production and accumulation of O2 , S2 O8 (2-) , Ce(4+) , and IO4 (-) as oxidation products. Most notably, S2 O8 (2-) , which possesses the highest oxidizability among all the peroxides, was generated with high applied bias photon-to-current efficiency (2.2 %) and faraday efficiency (≈100 %) upon irradiation from the back side of the photoelectrode. The design of a tandem photoelectrode system combining a dye-sensitized solar cell (DSSC) was also challenged for the realization of this photoelectrode system without external bias. A high solar energy conversion efficiency (5.2 %) was achieved in the tandem system comprising the WO3 photoelectrode connected to two DSSCs with a near-IR-utilizing dye in series for the production of H2 and S2 O8 (2-) .
authors: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan).
authors: Kojiro
authors: K
authors: Fuku
authors: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan).
authors: Nini
authors: N
authors: Wang
authors: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan).
authors: Yugo
authors: Y
authors: Miseki
authors: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan).
authors: Takashi
authors: T
authors: Funaki
authors: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan). k.sayama@aist.go.jp.
authors: Kazuhiro
authors: K
authors: Sayama
mesh_terms: D004563:Electrochemistry; D006859:Hydrogen / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D016062:Porosity; D013472:Sunlight
chemical_list: D006859:Hydrogen
keywords: WO3 photoelectrodes; hydrogen; oxidation reagents; tandem reactions; water splitting