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Frontiers in Energy

ISSN 2095-1701

ISSN 2095-1698(Online)

CN 11-6017/TK

Postal Subscription Code 80-972

2018 Impact Factor: 1.701

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Front. Energy    2019, Vol. 13 Issue (4) : 684-690    https://doi.org/10.1007/s11708-018-0585-8
RESEARCH ARTICLE
Roles of various Ni species on TiO2 in enhancing photocatalytic H2 evolution
Xiaoping CHEN1(), Jihai XIONG1, Jinming SHI1, Song XIA1, Shuanglin GUI1, Wenfeng SHANGGUAN2()
1. Institute of Energy Research, Jiangxi Academy of Sciences, Nanchang 330096, China
2. Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, Shanghai 200240, China
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Abstract

Low-cost nickels can be used as cocatalyst to improve the performance of photocatalysts, which may be promising materials applied in the field of photocatalytic water splitting. In this study, different nickel species Ni, Ni(OH)2, NiO, NiOx, and NiS are used to modified titanium dioxide (P25) to investigate their roles on the photocatalytic hydrogen evolution activities. UV-visible, X-ray diffraction (XRD), Brunner-Emmet-Teller (BET) measurements, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) analysis etc. are employed to characterize the physical and chemical properties of catalysts. The results indicate that all the nickel species can improve the photocatalytic hydrogen production activity of P25. The P25 modified with NiOx and NiS has more superior photocatalytic hydrogen evolution activities than those modified with other nickel species. The reason for this is that NiOx and NiS can form p-n junctions with P25 respectively. In addition, NiOx can be selectively deposited on the active sites of P25 via in situ the photodeposition method and NiS is beneficial for H+ reacting with photo-excited electrons.
Keywords nickel species      TiO2      photocatalytic hydrogen evolution     
Corresponding Author(s): Xiaoping CHEN,Wenfeng SHANGGUAN   
Just Accepted Date: 08 August 2018   Online First Date: 13 September 2018    Issue Date: 26 December 2019
 Cite this article:   
Xiaoping CHEN,Jihai XIONG,Jinming SHI, et al. Roles of various Ni species on TiO2 in enhancing photocatalytic H2 evolution[J]. Front. Energy, 2019, 13(4): 684-690.
 URL:  
https://academic.hep.com.cn/fie/EN/10.1007/s11708-018-0585-8
https://academic.hep.com.cn/fie/EN/Y2019/V13/I4/684
Fig.1  XRD patterns for nickels and P25 modified with nickels
Samples Atomic ratio
of Ni and Ti (ICP-AES)/%		 SBET/(m2?g–1)
P / 59.2
P-Ni 4.89 56.4
P-NiO 4.71 47.1
P-Ni(OH)2 4.96 49.9
P-NiS 1.30 52.4
P-in situ 1.88 50.9
Tab.1  Nickel contents and BET surface area of P25 modified with different nickel species
Fig.2  UV-visible spectra of P25 modified with different nickels
Fig.3  TEM images of P25 modified with different nickels
Fig.4  High-resolution XPS spectra of Ni for P25 modified with different nickel species
Fig.5  High-resolution XPS spectra of Ni for P-Ni(OH)2
Fig.6  Photocatalytic hydrogen evolution activities of P25 modified with different nickels
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