Solar Hydrogen Generation by Nanoscale p–n Junction of p-type Molybdenum Disulfide/n-type Nitrogen-Doped Reduced Graphene Oxide

Meng, Fanke; Li, Jiangtian; Cushing, Scott K.; Zhi, Mingjia; Wu, Nianqiang

doi:10.1021/ja404851s

Cited by 608 publications

(424 citation statements)

References 44 publications

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“…The proton reduction potential of the TiSi 2 electrode is ca. −0.20 V vs. RHE (reversible hydrogen electrode), but it changes to −0.13 V vs. RHE for the WS 2 -1/TiSi 2 -723 electrode, indicating that the introduction of WS 2 can reduce the hydrogen evolution potential [34,35], which is a property that is usually demonstrated by the noble metal nanoparticles such as Pt [36]. The replacement of Pt by WS 2 apparently can offer an opportunity to create an inexpensive photocatalyst system for H 2 evolution.…”

Section: Optical and Photoelectrochemical Propertiesmentioning

confidence: 97%

WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

et al. 2016

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Abstract:A noble-metal free photocatalyst consisting of WS 2 and TiSi 2 being used for hydrogen evolution under visible light irradiation, has been successfully prepared by in-situ formation of WS 2 on the surface of TiSi 2 in a thermal reaction. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results demonstrate that WS 2 moiety has been successfully deposited on the surface of TiSi 2 and some kind of chemical bonds, such as Ti-S-W and Si-S-W, might have formed on the interface of the TiSi 2 and WS 2 components. Optical and photoelectrochemical investigations reveal that WS 2 /TiSi 2 composite possesses lower hydrogen evolution potential and enhanced photogenerated charge separation and transfer efficiency. Under 6 h of visible light (λ > 420 nm) irradiation, the total amount of hydrogen evolved from the optimal WS 2 /TiSi 2 catalyst is 596.4 µmol·g −1 , which is around 1.5 times higher than that of pure TiSi 2 under the same reaction conditions. This study shows a paradigm of developing the effective, scalable and inexpensive system for photocatalytic hydrogen generation.

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Section: Optical and Photoelectrochemical Propertiesmentioning

confidence: 97%

WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

et al. 2016

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“…The charge separation is further improved by forming a p-n junction with p-type MoS 2 with n-type N-doped graphene. N-doped graphene composites with MoS 2 showed enhanced photocatalytic [35] and electrocatalytic HER activity [135] showed 600 times higher activity than the few-layer 2H-MoS 2 (inset in figure 11c) [35]. 1T-MoSe 2 shows even higher HER activity (approx.…”

Section: Catalysismentioning

confidence: 99%

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Jana¹,

Rao²

2016

Phil. Trans. R. Soc. A.

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The discovery of graphene marks a major event in the physics and chemistry of materials. The amazing properties of this two-dimensional (2D) material have prompted research on other 2D layered materials, of which layered transition metal dichalcogenides (TMDCs) are important members. Single-layer and few-layer TMDCs have been synthesized and characterized. They possess a wide range of properties many of which have not been known hitherto. A typical example of such materials is MoS 2 . In this article, we briefly present various aspects of layered analogues of graphene as exemplified by TMDCs. The discussion includes not only synthesis and characterization, but also various properties and phenomena exhibited by the TMDCs.This article is part of the themed issue 'Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene'.

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“…66,7178 The potential gradient on the surface is given by the diffusion of charge carriers between n-type and p-type semiconducting materials, which is expected to function as the driving force for photo-excited holes and electrons to move toward reduction and oxidation sites, respectively. However, advancements in this field have been limited due to difficulties in the preparation and evaluation of such junction structures to evaluate the effect of pn-junction surfaces on the photocatalytic activity.…”

Section: Preparation Of Nanosheet Pn-junction and Photocatalytic Actimentioning

confidence: 99%

Development of Light Energy Conversion Materials Using Two-Dimensional Inorganic Nanosheets

Ida

2015

Bulletin of the Chemical Society of Japan

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Nanosheets can be obtained by the exfoliation of layered compounds in a process where the three-dimensional structure of a bulk layered compound is converted into a twodimensional structure. The change in the structural dimension is expected to result in new physical and/or chemical functions. This paper describes 1) light energy conversion properties, such as photocatalytic activity and emission for nanosheets obtained by exfoliation of the layered compounds, and 2) charge separation of photoexcited electrons and holes by the potential gradient formed in the ultrathin pn-junction prepared using nanosheets.

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Solar Hydrogen Generation by Nanoscale p–n Junction of p-type Molybdenum Disulfide/n-type Nitrogen-Doped Reduced Graphene Oxide

Cited by 608 publications

References 44 publications

WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

WS2 as an Effective Noble-Metal Free Cocatalyst Modified TiSi2 for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Development of Light Energy Conversion Materials Using Two-Dimensional Inorganic Nanosheets

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