Synthesis and characterization of Z-scheme α-Fe2O3 NTs/ruptured tubular g-C3N4 for enhanced photoelectrochemical water oxidation

被引：63
作者：
Bakr, Ahmed Esmail A. [1 ,2 ]
El Rouby, Waleed M. A. [1 ]
Khan, Malik D. [2 ]
Farghali, Ahmed A. [1 ]
Xulu, B. [3 ]
Revaprasadu, Neerish [2 ]
机构：
[1] Beni Suef Univ, Fac Postgrad Studies Adv Sci PSAS, Mat Sci & Nanotechnol Dept, Bani Suwayf 62511, Egypt
[2] Univ Zululand, Dept Chem, Private Bag X1001, ZA-3886 Kwa Dlangezwa, South Africa
[3] Univ KwaZulu Natal, Dept Chem, Private Bag X01, ZA-3209 Pietermaritzburg, South Africa
来源：
SOLAR ENERGY | 2019年 / 193卷
基金：
新加坡国家研究基金会;
关键词：
alpha-Fe2O3; NTs; Photoelectrochemical water splitting; RT g-C3N4; Z-scheme heterostructure; GRAPHITIC CARBON NITRIDE; GRAPHENE OXIDE; (G-C3N4)-BASED PHOTOCATALYSTS; HYDROGEN-PRODUCTION; CHARGE-TRANSFER; HEMATITE; PERFORMANCE; COMPOSITE; PHOTODEGRADATION; PHOTOOXIDATION;
D O I：
10.1016/j.solener.2019.09.052
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
A composite of tubular g-C3N4 with alpha-Fe2O3 has been synthesized to improve the photocatalytic performance of tubular g-C3N4 by the formation of a Z-scheme heterostructure. The composites were fabricated by the combination of varying amounts of hydrothermally synthesized alpha-Fe2O3 nanotubes (NTs) and protonated ruptured tubular (RT) g-C3N4, by the electrostatic self-assembly method. The obtained composites were characterized by zeta potential, powdered-X-ray diffraction (p-XRD), scanning/transmission electron microscopy (S/TEM), photoluminescence (PL), and Fourier transform infrared spectroscopy (FTIR). PL and photocurrent measurements indicates a higher charge separation of the photo-generated electron-hole pair for Fe2O3 NTs/RT g-C3N4 composite with higher concentration of alpha-Fe2O3 NTs. UV-Vis diffuse reflectance spectroscopy (UV-Vis/DRS) shows the band gaps of pristine alpha-Fe2O3 NTs and RT g-C3N4 to be 1.86 eV and 2.72 eV respectively, while the band structures were determined by Mott-Schottky measurements. I-V curves obtained from photoelectrochemical water splitting shows that the formation of the composite decreased the oxidation overpotential as compared to pristine alpha-Fe2O3 NTs and pristine RT g-C3N4. Bode plots showed that the composite was able to increase the lifetime of the photo-generated electrons as compared to both RT g-C3N4 and alpha-Fe2O3 NTs.
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收藏
页码：403 / 412
页数：10
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