Enhanced Visible‐Light Photocatalytic H 2 Production by Zn x Cd 1− x S Modified with Earth‐Abundant Nickel‐Based Cocatalysts
2014; Wiley; Volume: 7; Issue: 12 Linguagem: Inglês
10.1002/cssc.201402574
ISSN1864-564X
AutoresJingrun Ran, Jun Zhang, Jiaguo Yu, Shi Zhang Qiao,
Tópico(s)Copper-based nanomaterials and applications
ResumoAbstract The application of various earth‐abundant Ni species, such as NiS, Ni, Ni(OH) 2 , and NiO, as a co‐catalyst in a Zn x Cd 1− x S system for visible‐light photocatalytic H 2 production was investigated for the first time. The loading of Ni or NiS enhanced the photocatalytic activity of Zn x Cd 1− x S because they could promote the electron transfer at the interface with Zn x Cd 1− x S and catalyze the H 2 evolution. Surprisingly, Ni(OH) 2 ‐loaded Zn x Cd 1− x S exhibits a very high photocatalytic H 2 ‐production rate of 7160 μmol h −1 g −1 with a quantum efficiency of 29.5 % at 420 nm, which represents one of the most efficient metal sulfide photocatalysts without a Pt co‐catalyst to date. This outstanding activity arises from the pronounced synergetic effect between Ni(OH) 2 and metallic Ni formed in situ during the photocatalytic reaction. However, the loading of NiO deactivated the activity of Zn x Cd 1− x S because of their unmatched conduction band positions. This paper reports the optimization of the Zn x Cd 1− x S system by selecting an appropriate Ni‐based co‐catalyst, Ni(OH) 2 , from a series of Ni species to achieve the highest photocatalytic H 2 ‐production activity for the first time and also reveals the roles of these Ni species in the photocatalytic activity.
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