Citation: LI Ai-Chang, SONG Min, ZHAO Sha-Sha, GUO Ying-Jie. Photoelectrocatalytic Property and Reaction Mechanism of Ag@AgBr/Ni Thin Films at Negative Bias for Rhodamine B[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(9): 1543-1551. doi: 10.11862/CJIC.2016.205 shu

Photoelectrocatalytic Property and Reaction Mechanism of Ag@AgBr/Ni Thin Films at Negative Bias for Rhodamine B

Faculty of chemistry and Material Science, Langfang Teachers College, Langfang, Hebei 065000, China

Corresponding author: LI Ai-Chang, aichangli@hotmail.com
Received Date: 11 March 2016
Revised Date: 31 July 2016

Figures(11)

Ag@AgBr/Ni thin films plasmonic photocatalyst were prepared by electrochemical method. The surface morphology, phase structure, optical characteristics of the thin films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), respectively. Its photoelectrocatalytic properties and stability at negative bias under visible light were evaluated with rhodamine B (RhB) as a model compound. Using eletrochemical technique and a method of adding active species scavenger to the solution, mechanism of photoelectrocatalytic degradation of the films were explored. The results show that the Ag@AgBr/Ni thin film prepared under optimum condition are composed of AgBr microparticles whose surface has silver nanoparticles with a significant surface plasmon resonance (SPR) effects. The Ag@AgBr/Ni film is photoelectrocatalytically more active than TiO₂/ITO (indium tin oxide) film. At optimum cathodic bias and under visible light irradiation in 12 min, the photoelectrocatalytic degradation rate of Ag@AgBr/Ni film is 10.2 times as much as that of porous TiO₂(Degussa P25)/ITO film. Compared with no cathodic bias, the photoeletrocatalytic degradation rate of the Ag@AgBr/Ni thin film to RhB is increased by 2.0 times and the thin film has obvious photoelectric synergistic effect. The photoelectrocatalytic activity almost kept unchanged after five recycled experiments. The improvement in photoelectrocatalytic activity for Ag@AgBr/Ni thin films could be mainly attributed to the activation of nano Ag particles on the electrode for photocathode reaction (Conduction band reaction) with a significant SPR effects. Furthermore, the photoelctrocatalytic reaction mechanism of Ag@AgBr/Ni thin films for RhB at negative bias was proposed.
- Ag@AgBr/Ni thin film,
- surface plasmon resonance,
- photoelectrocatalysis,
- rhodamine B,
- reaction mechanism
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