Cu@Cu 2 O films were prepared by electrochemical deposition method. The obtained Cu@Cu 2 O films were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), confocal Raman spectroscopy (CRS), UV–visible absorption spectroscopy and Photoluminescence (PL) spectroscopy. Electrochemical measurements were performed under intermittent visible light illumination to assess the photoelectrochemical cathodic protection effect of the prepared Cu@Cu 2 O films. The results indicated that a lower deposition potential could facilitate the reduction of Cu 2 O grain size together with an increase number of Cu. But the deposition potential has no obvious influence on the band-gap of the composite films, which exhibited n-type semiconductor properties. The open circuit potential of 304 stainless steel by coupling with the Cu@Cu 2 O-0.3 V films presented the most negative shift of −179 mV under visible-light illumination. The related photocurrent density was 0.13 mA·cm −2 . The photoelectrochemical conversion mechanism and the photoelectrochemical cathodic protection effects of the Cu@Cu 2 O films were discussed in detail.
Ping Qiu,Yongyong Lai,Xulu Sun,Changfeng Chen,Lei Ge
Various approaches have been developed to enhance n-type Cu 2 O photoelectrochemical activity. This study introduced a simple method of tuning electronic structure through adjusting solution pH when electrodeposition of Cu 2 O films on FTO substrate. Combined surface analysis showed that the Cu 2 O films presented gradual change cruciate flower-like nanostructure and hybrided with metallic copper. The Cu/Cu 2 O films presented a visible light response and the band gap could be effectively decreased by increasing the deposition solution pH. The photoelectrochemical cathodic protection performance of the films was studied. The electrode potential of 304 stainless steel by coupling with the Cu/Cu 2 O films (deposited at pH 5) reached the most negative photopotential shift of 179 mV under illumination. The related photocurrent density was 0.12 mA/cm 2 . This enhanced photoelectrochemical performance was evidenced by both direct excitation of Cu 2 O and the surface plasmon resonance effects of Cu upon illumination.
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