Unbiased Photoelectrochemical Water Splitting in Z?Scheme Device Using W/Mo?Doped BiVO4 and ZnxCd1? xSe
- Unbiased Photoelectrochemical Water Splitting in Z?Scheme Device Using W/Mo?Doped BiVO4 and ZnxCd1? xSe
- 박현서; 이흥찬; Kevin C Leonard; Guanjie Liu; Allen J Bard
- Issue Date
- VOL 14, NO 10, 2277-2287
- Photoelectrochemical water splitting to generate H2 and O2 using only photon energy (with no added electrical energy) has been demonstrated with dual n-type-semiconductor (or Zscheme)
systems. Here we investigated two different Z-scheme systems; one is comprised of two cells with the same metaloxide semiconductor (W- and Mo-doped bismuth vanadate), that is, Pt-W/Mo-BiVO4, and the other is comprised of the metal oxide and a chalcogenide semiconductor, that is, Pt-W/Mo-BiVO4 and Zn0.2Cd0.8Se. The redox couples utilized in these Z-scheme configurations were I /IO3 or S2 /Sn2 , respectively. An electrochemical analysis of the system in terms of cell components is shown to illustrate the behavior of the complete photoelectrochemical Z-scheme water-splitting system. H2 gas from the unbiased photolysis of water was detected using gas chromatography–mass spectroscopy and using a membraneelectrode assembly. The electrode configuration to achieve the maximum conversion efficiency from solar energy to chemical energy with the given materials and the Z-scheme is discussed. Here, the possibilities and challenges of Z-scheme unbiased photoelectrochemical water-splitting devices and the materials to achieve practical solar-fuel generation are discussed.
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