Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 35, Pages 23006-23014Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b05777
Keywords
cagelike hollow spheres; multiple reflection; hydrogenation; photocatalysis; hydrogen evolution; water splitting
Funding
- National Natural Science Foundation of China [21476159, U1332102]
- 973 Program [2014CB932403]
- Natural Science Foundation of Tianjin, PR China [15JCZDJC37400]
- Program of Introducing Talents of Disciplines to China Universities [B06006]
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We synthesized the hydrogenated cagelike TiO2 hollow spheres through a facile sacrificial template method. After the hydrogenation treatment, the disordered surface layer and cagelike pores were generated on the shell of the hollow spheres. The spheres exhibit a high hydrogen evolution rate of 212.7 +/- 10.6 mu mol h(-1) (20 mg) under the simulated solar light irradiation, which is similar to 12 times higher than the hydrogenated TiO2 solid spheres and is similar to 9 times higher than the original TiO2 hollow spheres. The high activity results from the unique architectures and hydrogenation. Both the multiple reflection that was improved by the cagelike hollow structures and the red shift of the absorption edge that was induced by hydrogenation can enhance the ultraviolet and visible light absorption. In addition, the high concentration of oxygen vacancies, as well as the hydrogenated disordered surface layer, can improve the efficiency for migration and separation of generated charge carriers.
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