tailieunhanh - Báo cáo hóa học: " Solar light-driven photocatalytic hydrogen evolution over ZnIn2S4 loaded with transition-metal sulfides"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Solar light-driven photocatalytic hydrogen evolution over ZnIn2S4 loaded with transition-metal sulfides | Shen et al. Nanoscale Research Letters 2011 6 290 http content 6 1 290 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Solar light-driven photocatalytic hydrogen evolution over ZnIn2S4 loaded with transition-metal sulfides Shaohua Shen1 2 Xiaobo Chen2 Feng Ren2 Coleman X Kronawitter2 Samuel S Mao2 and Liejin Guo1 Abstract A series of Pt-loaded MS ZnIn2S4 MS transition-metal sulfide Ag2S SnS CoS CuS NiS and MnS photocatalysts was investigated to show various photocatalytic activities depending on different transition-metal sulfides. Thereinto CoS NiS or MnS-loading lowered down the photocatalytic activity of ZnIn2S4 while Ag2S SnS or CuS loading enhanced the photocatalytic activity. After loading wt. CuS together with wt. Pt on ZnIn2S4 the activity for H2 evolution was increased by up to times compared to the ZnIn2S4 only loaded with wt. Pt. Here transition-metal sulfides such as CuS together with Pt acted as the dual co-catalysts for the improved photocatalytic performance. This study indicated that the application of transition-metal sulfides as effective cocatalysts opened up a new way to design and prepare high-efficiency and low-cost photocatalysts for solarhydrogen conversion. Introduction Since the discovery of photo-induced water splitting on TiO2 electrodes 1 solar-driven photocatalytic hydrogen production from water using a semiconductor catalyst has attracted a tremendous amount of interest 2 3 . To efficiently utilize solar energy numerous attempts have been made in recent years to realize different visible light-active photocatalysts 4-8 . Among them sulfides especially CdS-based photocatalysts with narrow band gaps proved to be good candidates for photocata-lytic hydrogen evolution from water under visible light irradiation 9-12 . However CdS itself is not stable for water splitting and Cd2 is hazardous to environment and human health. A number of nontoxic multicomponent sulfides .

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