偏压控制Cu2O和Cu在TiO2表面的生长及其光电化学性质

doi:10.3866/PKU.WHXB201407221

Abstract

Abstract:

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.

Key words: Cuprous oxide, Copper, Electrochemical deposition, Photoelectrochemical property, Titatium oxide film

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 Phys. -Chim. Sin. 2014, 30(10), 1867-1875. doi: 10.3866/PKU.WHXB201407221

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Bias-Determined Cu₂O and Cu Growth on TiO₂ Surface and Their Photoelectrochemical Properties

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Bias-Determined Cu₂O and Cu Growth on TiO₂ Surface and Their Photoelectrochemical Properties