Limits...
Solar light-driven photocatalytic hydrogen evolution over ZnIn2S4 loaded with transition-metal sulfides.

Shen S, Chen X, Ren F, Kronawitter CX, Mao SS, Guo L - Nanoscale Res Lett (2011)

Bottom Line: After loading 1.0 wt.% CuS together with 1.0 wt.% Pt on ZnIn2S4, the activity for H2 evolution was increased by up to 1.6 times, compared to the ZnIn2S4 only loaded with 1.0 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 co-catalysts opened up a new way to design and prepare high-efficiency and low-cost photocatalysts for solar-hydrogen conversion.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China. ssmao@lbl.gov.

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 1.0 wt.% CuS together with 1.0 wt.% Pt on ZnIn2S4, the activity for H2 evolution was increased by up to 1.6 times, compared to the ZnIn2S4 only loaded with 1.0 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 co-catalysts opened up a new way to design and prepare high-efficiency and low-cost photocatalysts for solar-hydrogen conversion.

No MeSH data available.


Time courses of H2 evolution. The time courses of H2 evolution over Pt-loaded MS/ZnIn2S4 (MS = Ag2S, SnS, and CuS) under solar light irradiation.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211356&req=5

Figure 2: Time courses of H2 evolution. The time courses of H2 evolution over Pt-loaded MS/ZnIn2S4 (MS = Ag2S, SnS, and CuS) under solar light irradiation.

Mentions: Figure 2 shows the reaction time depended H2 evolution over Pt-loaded MS/ZnIn2S4 (MS = Ag2S, SnS, and CuS) under solar irradiation. Pt-SnS/ZnIn2S4 and Pt-CuS/ZnIn2S4 exhibited stable activity in the period of 34-h experiment. However, the rate of H2 production over Pt-Ag2S/ZnIn2S4 had a significant drop after irradiation for approximately 20 h. This deactivation may result from gradual reduction of Ag2S particles loaded on the surface of ZnIn2S4 to metallic Ag by photo-generated electrons during the reaction. Similar deactivation of photocatalyst was previously observed for CdS modified with Ag2S [32]. However, this result is quite different from our previous report on Pt-Ag2S/CdS, in which the high dispersion of Ag2S in the nanostructure of CdS contributed to stable photocatalytic activity for hydrogen evolution [33]. Taking into account the reduction potential (vs. normal hydrogen electrode (NHE)) of Ag+/Ag (0.80 V), Cu2+/Cu (0.34 V), and Sn2+/Sn (-0.14 V), reduction of Ag2S by photo-generated electrons is easier than photoreduction of CuS and SnS. Therefore, Pt-MS/ZnIn2S4 (MS = SnS and CuS) turned to be more stable than Pt-Ag2S/ZnIn2S4 during the photocatalytic reaction for hydrogen evolution.


Solar light-driven photocatalytic hydrogen evolution over ZnIn2S4 loaded with transition-metal sulfides.

Shen S, Chen X, Ren F, Kronawitter CX, Mao SS, Guo L - Nanoscale Res Lett (2011)

Time courses of H2 evolution. The time courses of H2 evolution over Pt-loaded MS/ZnIn2S4 (MS = Ag2S, SnS, and CuS) under solar light irradiation.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211356&req=5

Figure 2: Time courses of H2 evolution. The time courses of H2 evolution over Pt-loaded MS/ZnIn2S4 (MS = Ag2S, SnS, and CuS) under solar light irradiation.
Mentions: Figure 2 shows the reaction time depended H2 evolution over Pt-loaded MS/ZnIn2S4 (MS = Ag2S, SnS, and CuS) under solar irradiation. Pt-SnS/ZnIn2S4 and Pt-CuS/ZnIn2S4 exhibited stable activity in the period of 34-h experiment. However, the rate of H2 production over Pt-Ag2S/ZnIn2S4 had a significant drop after irradiation for approximately 20 h. This deactivation may result from gradual reduction of Ag2S particles loaded on the surface of ZnIn2S4 to metallic Ag by photo-generated electrons during the reaction. Similar deactivation of photocatalyst was previously observed for CdS modified with Ag2S [32]. However, this result is quite different from our previous report on Pt-Ag2S/CdS, in which the high dispersion of Ag2S in the nanostructure of CdS contributed to stable photocatalytic activity for hydrogen evolution [33]. Taking into account the reduction potential (vs. normal hydrogen electrode (NHE)) of Ag+/Ag (0.80 V), Cu2+/Cu (0.34 V), and Sn2+/Sn (-0.14 V), reduction of Ag2S by photo-generated electrons is easier than photoreduction of CuS and SnS. Therefore, Pt-MS/ZnIn2S4 (MS = SnS and CuS) turned to be more stable than Pt-Ag2S/ZnIn2S4 during the photocatalytic reaction for hydrogen evolution.

Bottom Line: After loading 1.0 wt.% CuS together with 1.0 wt.% Pt on ZnIn2S4, the activity for H2 evolution was increased by up to 1.6 times, compared to the ZnIn2S4 only loaded with 1.0 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 co-catalysts opened up a new way to design and prepare high-efficiency and low-cost photocatalysts for solar-hydrogen conversion.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China. ssmao@lbl.gov.

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 1.0 wt.% CuS together with 1.0 wt.% Pt on ZnIn2S4, the activity for H2 evolution was increased by up to 1.6 times, compared to the ZnIn2S4 only loaded with 1.0 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 co-catalysts opened up a new way to design and prepare high-efficiency and low-cost photocatalysts for solar-hydrogen conversion.

No MeSH data available.