ساخت و مشخصه یابی فوتوالکترود تیتانیوم دی اکسید مزو متخلخل قالب گیری شده ی اتصال یافته با بیسموت وانادات

Subject Areas : journal of New Materials

Reza Keshavarzi ¹ , niloufar Afzali ²

1 - Assistant Professor, Department of Chemistry, Catalysis Division, University of Isfahan, Isfahan, 81746-73441, Iran
2 - Postdoctoral researcher, Department of Chemistry, Catalysis Division, University of Isfahan, Isfahan, 81746-73441, Iran.

Received: 2022-07-15 Accepted : 2022-09-12 Published : 2022-01-21

Keywords: semiconductor, Bismuth vanadate, Mesoporous titanium dioxide,

Abstract :

Bismuth vanadate is one of the most widely used semiconductors for photoelectrochemical water splitting using sunlight due to its activity in the presence of visible light, stability, and cost-effectiveness. In addition to having a suitable band gap, this semiconductor has disadvantages such as high electron-hole recombination. In this research, with the aim of reducing electron-hole recombination and increasing the efficiency of bismuth vanadate photoelectrodes, templated mesoporous titanium dioxide prepared by P123, F127, and Brij 58 copolymers were used. The effect of three and two-block copolymers on the properties of prepared mesoporous synthesized titanium dioxide and their effect on the bismuth vanadate photoelectrode was investigated by FE-SEM, XRD, UV-vis, and BET analyses. These copolymers changed the porosity by creating cavities of different sizes, resulting in different loads of bismuth vanadate on titanium dioxide. To evaluate the photoelectrochemical results, LSV and electrochemical impedance spectroscopy were performed on the photoelectrodes. Absorption in the visible region showed an increase in current at a potential of 1.23V vs RHE and a low charge transfer resistance in Meso TiO2 / BiVO4 samples. The results showed that the templated mesoporous titanium dioxide increases the activity of bismuth vanadate up to 2.5 times.

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