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题名: Effect of Phase Junction Structure on the Photocatalytic Performance in Overall Water Splitting: Ga2O3 Photocatalyst as an Example
作者: Jin, Shaoqing1, 2;  Wang, Xiang1;  Wang, Xiuli1;  Ju, Minggang3;  Shen, Shuai1;  Liang, Wanzhen4, 5;  Zhao, Yi4, 5;  Feng, Zhaochi1;  Playford, Helen Y.6;  Walton, Richard I.6;  Li, Can1, 5
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2015-08-13
DOI: 10.1021/acs.jpcc.5b04092
卷: 119, 期:32, 页:18221-18228
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: The fabrication of surface phase junctions has proven to be an efficient strategy for the enhancement of photocatalytic activity; however, some questions about these systems are not yet well understood. In this study, the photocatalytic overall water splitting reaction was achieved on photocatalysts with pure and mixed phase compositions of cubic gamma-Ga2O3 and monoclinic beta-Ga2O3. All the Ga2O3 photocatalysts can split water stoichiometrically into H-2 and O-2; however, the phase-mixed gamma/beta-Ga2O3 photocatalyst with a small amount of beta phase shows the lowest activity. This is opposite from that of the reported alpha/beta-Ga2O3 system in which the phase-mixed alpha/beta-Ga2O3 photocatalyst with a small amount of beta phase shows much higher photocatalytic activity than the individual phases. Much more disordered structure is found between the gamma and beta phases in the gamma/beta-Ga2O3 photocatalyst with low content of beta phase due to the defective spinel structure of gamma phase. Spectroscopic characterization and theoretical calculations indicate that the disordered structure serves as defect and charge recombination centers resulting in the decrease of photocatalytic activity. Based on the analysis of alpha/beta-Ga2O3 and gamma/beta-Ga2O3 systems, it is proposed that a prerequisite for the formation of phase junction boosting photocatalytic reactions is that the interfacial structure between two phases should not be disordered or defective.
关键词[WOS]: GALLIUM OXIDE ;  CRYSTAL-STRUCTURE ;  H2O ;  H-2 ;  SPECTROSCOPY ;  O-2 ;  DEHYDROGENATION ;  DECOMPOSITION ;  LUMINESCENCE ;  GAMMA-GA2O3
语种: 英语
WOS记录号: WOS:000359683800025
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146459
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China
4.Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China
5.Univ Warwick, Collaborat Innovat Ctr Chem Energy Mat, Coventry CV4 7AL, W Midlands, England
6.Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands, England

Recommended Citation:
Jin, Shaoqing,Wang, Xiang,Wang, Xiuli,et al. Effect of Phase Junction Structure on the Photocatalytic Performance in Overall Water Splitting: Ga2O3 Photocatalyst as an Example[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2015,119(32):18221-18228.
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