Photocatalytic hydrogen evolution on the hetero-system polypyrrol/TiO2 under visible light

被引：23
作者：
Belabed, C. [1 ]
Haine, N. [1 ]
Benabdelghani, Z. [2 ]
Bellal, B. [2 ]
Trari, M. [2 ]
机构：
[1] Fac Phys USTHB, Phys Mat Lab, Algiers 16111, Algeria
[2] USTHB, Fac Chem, Lab Storage & Valorizat Renewable Energies, Algiers 16111, Algeria
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2014年 / 39卷 / 31期
关键词：
Polypyrrol (PPy); TiO2; Hetero-system; Photo-electrochemical; Electrochemical impedance; spectroscopy; Hydrogen; FOSSIL-FUELS; NANOPARTICLES;
D O I：
10.1016/j.ijhydene.2014.08.107
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The semiconducting properties of the hetero-system polypyrrol(PPy)/TiO2 are investigated for the first time to assess its photo catalytic hydrogen evolution under visible light. The hetero-system PPy/TiO2 is stable up to similar to 345 K, with a weight loss accounting for similar to 1.2%. The Xray diffraction shows mixed phases with the rutile TiO2 variety. Optical transitions at 0.42 and 3.01 eV, directly allowed, are determined for PPy and TiO2 respectively. The p-type conductivity of PPy is evidenced from the Mott-Schottky plot; In neutral solution, a flat band potential of 0.11 V-SCE and a holes density of 4.57 x 1021 cm(-3) are obtained. The electrochemical impedance spectroscopy, measured over a wide frequency range (1 mHz-10(5) Hz), reveals the contribution of the bulk and grain boundaries with a constant phase element (CPE). The energetic diagram predicts the electron injection from PPy into TiO2 and the best photoactivity is achieved at pH similar to 7. A hydrogen liberation rate of 1.15 mmolh(-1) (g catalyst)(-1) and a quantum efficiency of 0.17% under full light (29 mW cm(-2)) are determined in presence S2O32-. The photoactivity is completely restored during the second cycle, indicating a zero deactivation effect. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：17533 / 17539
页数：7
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