期刊
DALTON TRANSACTIONS
卷 47, 期 19, 页码 6763-6771出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7dt04258b
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资金
- State Key Laboratory of Chemical Resource Engineering
- National Natural Science Foundation of China [51772015, 21576016]
A Cu2O/BiVO4 p-n heterojunction based photoanode in photoelectrochemical (PEC) water splitting is fabricated by a two-step electrodeposition method on an FTO substrate followed by annealing treatment. The structures and properties of the samples are characterized by XRD, FESEM, HRTEM, XPS and UV-visible spectra. The photoelectrochemical activity of the photoanode in water oxidation has been investigated and measured in a three electrode quartz cell system; the obtained maximum photocurrent density of 1.72 mA cm(-2) at 1.23 V vs. RHE is 4.5 times higher than that of pristine BiVO4 thin films (similar to 0.38 mA cm(-2)). The heterojunction based photoanode also exhibits a tremendous cathodic shift of the onset potential (similar to 420 mV) and enhancement in the IPCE value by more than 4-fold. The enhanced photoelectrochemical properties of the Cu2O/BiVO4 photoelectrode are attributed to the efficient separation of the photoexcited electron-hole pairs caused by the inner electronic field (IEF) of the p-n heterojunction.
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