Citation: JIANG Chun-Xiang, HU Yu-Xiang, DONG Wen, ZHENG Fen-Gang, SU Xiao-Dong, FANG Liang, SHEN Ming-Rong. Bias-Determined Cu2O and Cu Growth on TiO2 Surface and Their Photoelectrochemical Properties[J]. Acta Physico-Chimica Sinica, ;2014, 30(10): 1867-1875. doi: 10.3866/PKU.WHXB201407221
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Based on the cyclic voltammogram (CV) of TiO2/Ti electrodes in Cu2+ ion solution, we fabricated Cu2O and Cu particles onto TiO2 flat surfaces separately or simultaneously by adjusting the applied potentials during electrodeposition. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) showed that Cu2O and Cu have different growth modes: Cu2O particles crystallize on the TiO2 surface separately while Cu particles nucleate on previously grown particles, forming a stacked particle structure. This growth behavior can be explained by the different electron transfer behavior on the Cu2O/TiO2 and Cu/TiO2 interfaces and this is determined by their bandgap alignments. Compared with a pure TiO2 photoanode, a significant enhancement of the photocurrent was observed for both the Cu2O/TiO2 and Cu/TiO2 heterostructures. A potential region exists where Cu2O and Cu grow on the TiO2 surface simultaneously and the corresponding photocurrent is relatively stable and reaches a maximum. UV-Vis diffuse reflectance spectroscopy, electrochemical impedance spectroscopy (EIS), and photocurrent vs potential characteristics revealed that the visible light absorption by Cu2O and Cu contributes significantly to the photocurrent. Cu/TiO2 resulted in greater broadband visible light utilization during the photoelectric conversion. Additionally, the increased zero-current potential and the effective charge separation as well as the rapid carrier transfer on the electrode/electrolyte interface are also related to the enhanced photoelectrochemical properties.
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