Bandgap modulation of polyimide photocatalyst for optimum H2 production activity under visible light irradiation

被引：89
作者：
Chu, Sheng [1 ,2 ]
Wang, Ying [1 ,2 ,3 ]
Wang, Cuicui [1 ,2 ]
Yang, Juncheng [1 ,2 ]
Zou, Zhigang [1 ,3 ]
机构：
[1] Nanjing Univ, Ecomaterials & Renewable Energy Res Ctr ERERC, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Sch Chem & Chem Engn, Nanjing 210093, Jiangsu, Peoples R China
[3] Nanjing Univ, Kunshan Innovat Inst, Kunshan 215300, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2013年 / 38卷 / 25期
关键词：
Polyimide; Bandgap; Water splitting; Hydrogen; Photocatalysis; SOLID-SOLUTION; HYDROGEN GENERATION; WATER;
D O I：
10.1016/j.ijhydene.2013.02.035
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：
A series of polyimide photocatalysts with different polymerization degrees were prepared by thermal condensation of melamine and pyromellitic dianhydride at different condensation temperatures between 250 degrees C and 350 degrees C. Fourier transform infrared (FT-IR) spectra, X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) revealed that the polymerization degree increased with increasing condensation temperature. UV-Vis absorption spectra showed that the bandgap energy was lineally decreased with the increase of temperature. The theoretical calculations indicated that the level of conduction band downshifted and valence band upshifted upon the bandgap narrowing. Photocatalytic results displayed that the sample with moderate bandgap exhibited the highest H-2 evolution activity, which adapted the balance among many factors such as light absorption, band potentials, crystallinity, particle size and surface area. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：10768 / 10772
页数：5
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