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A coupled WO 3 /BiVO 4 thin film has been deposited on FTO substrate by a spin coating method from precursor solutions. The composite films were characterized by AFM, SEM, XPS and XRD techniques. The incident photon to current efficiency (IPCE) of BiVO 4 electrode was increased by 10 times when a WO 3 film was layered between the BiVO 4 layer and the FTO substrate...
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