Non-precious co-catalysts boost the performance of TiO2 hierarchical hollow mesoporous spheres in solar fuel cells

被引：43
作者：
Ahmed, Nashaat [1 ]
Ramadan, Mohamed [1 ]
El Rouby, Waleed M. A. [2 ]
Farghali, Ahmed A. [2 ]
Allam, Nageh K. [1 ]
机构：
[1] Amer Univ Cairo, Sch Sci & Engn, EML, New Cairo 11835, Egypt
[2] Beni Suef Univ, Fac Postgrad Studies Adv Sci PSAS, Mat Sci & Nanotechnol Dept, Bani Suwayf 62511, Egypt
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2018年 / 43卷 / 46期
关键词：
Water splitting; Hollow spheres; Co-catalyst; Graphene; Impedance; HYDROGEN EVOLUTION; GRAPHENE OXIDE; PHOTOCATALYTIC ACTIVITY; NANOTUBE ARRAYS; WATER; NANOPARTICLES; HETEROJUNCTION; PHOTOREDUCTION; SEPARATION; FILMS;
D O I：
10.1016/j.ijhydene.2018.10.012
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 main challenge hindering the development of efficient solar fuel cell systems is the identification of robust, cost-effective, and abundant catalysts. Herein, we demonstrate the ability to synthesize photoactive, relatively cheap and abundant catalyst for the solar-assisted water splitting. The proposed catalyst is a composite of Co-Cu/graphene immobilized on hierarchical hollow mesoporous Titania. Diffuse Reflectance analysis showed visible light absorption for (Co-Cu) (2%)-TiO2/RGO with an estimated band gap of 2.41 eV, as compared to 3.13 eV for Titania. Photoluminescence spectra showed a significant decreasing in recombination rate of photogenerated electron-hole pair for (Co-Cu) (2%)-TiO2/RGO nanocomposites. Upon their use as photoanodes in solar fuel cells, the fabricated nanocomposites show 14-fold increase in photocurrent density compared to Titania. This enhancement was confirmed via the measurement of electron and phonon life times. The results attained in this study demonstrate a step toward using non-precious co-catalysts to boost the performance of photocatalysts in solar fuel cells. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：21219 / 21230
页数：12
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