Photocatalytic hydrogen production over carbon nitride loaded with WS2 as cocatalyst under visible light

Hou, Yidong; Zhu, Yongsheng; Xu, Yan; Wang, Xinchen

doi:10.1016/j.apcatb.2014.03.002

Cited by 185 publications

(71 citation statements)

References 29 publications

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“…Furthermore, the impedance spectroscopy results indicate that the CdS/ WS 2 /ITO (8 V-30 s) system has the lowest charge transfer resistance as compared with other samples prepared with higher EPD time. Because of the anisotropic conductivity of WS 2 [50], a higher resistance is detected when the amount of the WS 2 layers increase, also supported by our EIS results (see Fig. 8).…”

Section: Mechanism Of Photo-enhanced Pec Propertysupporting

confidence: 88%

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Controlled engineering of WS2 nanosheets–CdS nanoparticle heterojunction with enhanced photoelectrochemical activity

Zirak

Zhao

Moradlou

et al. 2015

Solar Energy Materials and Solar Cells

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a b s t r a c tWe report the well-controlled preparation of WS 2 nanosheets-CdS nanoparticle heterojunction for photoelectrochemical (PEC) water splitting application. The WS 2 nanosheets with an average thickness of $ 5 nm and lateral dimensions of $200 nm were synthesized via liquid phase exfoliation of bulk WS 2 in water/ethanol solution, followed by deposition onto ITO substrate via electrophoretic method. CdS nanoparticles were grown via facile successive ion layer absorption and reaction (SILAR) method. Using these two well-controlled methods, CdS/WS 2 /ITO and WS 2 /CdS/ITO systems were fabricated. The loading of WS 2 nanosheets was controlled by the deposition condition and the heterojunction was optimized for enhanced photoelectrochemical response under simulated sunlight irradiation. The fabricated electrodes were characterized by various analytical techniques as well as PEC response and electrochemical impedance spectroscopy (EIS). Our results showed that the CdS/WS 2 /ITO heterojunction exhibits a stable photo-current density which is 3 times higher than the CdS/ITO electrode. In contrast, photo-current density of the WS 2 /CdS/ITO electrode was lower than that of the bare CdS/ITO, indicating that an appropriate energy level cascade is essential for achieving enhanced PEC response. A charge transfer mechanism was proposed to explain the observed PEC enhancement. This work indicates that the exfoliated WS 2 nanosheet is a promising material for stable photoelectrochemical applications.

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Section: Mechanism Of Photo-enhanced Pec Propertysupporting

confidence: 88%

“…WS 2 has a higher intrinsic electrical conductivity than MoS 2 [23], and therefore is a more suitable candidate for fabrication of hybrid composite. Layered hybrid composites of the WS 2 , including WS 2 /CN [24], WS 2 /rGO [25] and ZnS-WS 2 /CdS [26] with enhanced hydrogen production activity were reported.…”

Section: Introductionmentioning

confidence: 99%

Controlled engineering of WS2 nanosheets–CdS nanoparticle heterojunction with enhanced photoelectrochemical activity

Zirak

Zhao

Moradlou

et al. 2015

Solar Energy Materials and Solar Cells

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“…This approach complements thereby current research trends where efficiency enhancement of carbon nitride is realized by heterojunctions with co-catalytic materials. [11][12][13] In powder form, the g-C 3 N 4 photocatalyst necessitates the presence of sacricial electron donors (triethanolamine for instance), in order to compensate for the charges consumed in the course of proton reduction. To overcome this limitation, the fabrication of macroscopic solid state (photo-) electrodes with compact g-C 3 N 4 lms was soon suggested.…”

Section: -10mentioning

confidence: 99%

Graphitic carbon nitride nano-emitters on silicon: a photoelectrochemical heterojunction composed of earth-abundant materials for enhanced evolution of hydrogen

et al. 2014

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Graphitic carbon nitride is a promising heterogeneous catalyst for light-induced generation of hydrogen. Here, we report the successful formation of nano-scaled carbon nitride structures on silicon, mitigating the known limitations of charge transport within bulky C-N networks. An efficient photoelectrochemical heterojunction is thereby realized, developed from earth-abundant materials only.The conversion of solar energy to chemical energy is one of the principal routes to establish a green global economy.1 Particularly, hydrogen as a product of solar water splitting may assume a decisive role upon transition from fossil to renewable energy resources.2 For realization of the solar-to-hydrogen conversion process by photoelectrochemical water splitting, suitable photoelectrodes still have to be developed and to meet important demands such as efficiency and durability. Most critical, electrode fabrication has to rely on cost-saving material consumption, and the use of earth-abundant materials appears inevitable for novel device architectures. In this respect, the combination of silicon and polymeric graphitic carbon nitride (g-C 3 N 4 ) represents a highly attractive heterostructure, integrating a state-of-the-art photoabsorber and a promising photocatalyst. Silicon-based photoelectrodes on the one hand, already reached near-record efficiencies in light-induced evolution of hydrogen but had to be activated by noble-metal catalysts.3,4 On the other hand, g-C 3 N 4 is an established candidate for photocatalytic hydrogen production since the report of Wang et al. in 2008 (ref. 5) which boosted almost instantaneously the interest in this material due to the prospect of solar fuel generation without use of noble metal catalysts. 6-10

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“…Recently, the incorporation of 2D g-C3N4 photocatalyst with other 2D nanomaterials forming 2D/2D heterojunction hybrid nanocomposites has conceivably drawn increasing attention with practical importance (Hou et al, 2014;Xing et al, 2017). As a matter of fact, the layered heterojunction comprised dissimilar 2D nanomaterials is projected to give rise to positive impacts on charge transfer and separation as a result of built-in electric field at the atomically well-defined ultrathin interface (Hou et al, 2013b;Lu et al, 2016).…”

Section: Institute Of Materials Research and Engineering (Imre) Agenmentioning

confidence: 99%

2D/2D Graphitic Carbon Nitride (g-C3N4) Heterojunction Nanocomposites for Photocatalysis: Why Does Face-to-Face Interface Matter?

Ong

2017

Front. Mater.

211

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In recent years, two-dimensional (2D) graphitic carbon nitride (g-C3N4) has elicited interdisciplinary research fascination among the scientific communities due to its attractive properties such as appropriate band structures, visible-light absorption, and high chemical and thermal stability. At present, research aiming at engineering 2D g-C3N4 photocatalysts at an atomic and molecular level in conquering the global energy demand and environmental pollution has been thriving. In this review, the cutting-edge research progress on the 2D/2D g-C3N4-based hybrid nanoarchitectures will be systematically highlighted with a specific emphasis on a multitude of photocatalytic applications, not only in waste degradation for pollution alleviation, but also in renewable energy production [e.g., water splitting and carbon dioxide (CO2) reduction]. By reviewing the substantial developments on this hot research platform, it is envisioned that the review will shed light and pave a new prospect for constructing high photocatalytic performance of 2D/2D g-C3N4-based system, which could also be extended to other related energy fields, namely solar cells, supercapacitors, and electrocatalysis.

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Photocatalytic hydrogen production over carbon nitride loaded with WS2 as cocatalyst under visible light

Cited by 185 publications

References 29 publications

Controlled engineering of WS2 nanosheets–CdS nanoparticle heterojunction with enhanced photoelectrochemical activity

Controlled engineering of WS2 nanosheets–CdS nanoparticle heterojunction with enhanced photoelectrochemical activity

Graphitic carbon nitride nano-emitters on silicon: a photoelectrochemical heterojunction composed of earth-abundant materials for enhanced evolution of hydrogen

2D/2D Graphitic Carbon Nitride (g-C3N4) Heterojunction Nanocomposites for Photocatalysis: Why Does Face-to-Face Interface Matter?

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