Layered Nanojunctions for Hydrogen‐Evolution Catalysis

Hou, Yidong; Laursen, Anders B.; Zhang, Jinshui; Zhang, Guigang; Zhu, Yongsheng; Wang, Xinchen; Dahl, Søren; Chorkendorff, Ib

doi:10.1002/anie.201210294

Cited by 815 publications

(414 citation statements)

References 56 publications

(16 reference statements)

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“…The cathodic current observed in the range of À0.6 to À0.9 V vs. RHE can be attributed to H 2 evolution (Figure 8). [45] Compared with ZCS, NiS-ZCS and Ni-ZCS exhibit much higher activities towards HER as both NiS and Ni are excellent electrocatalysts able to reduce the overpotential and boost the kinetics of the HER, [46,47] which is consistent with the apparently increased photocatalytic H 2 -production rates observed on NiS-ZCS and Ni-ZCS. Moreover, NiO-ZCS also shows some HER activity thanks to the presence of NiO, which is an active HER co-catalyst reported in many photocatalyst systems.…”

supporting

confidence: 72%

Enhanced Visible‐Light Photocatalytic H₂ Production by Zn_xCd_1−xS Modified with Earth‐Abundant Nickel‐Based Cocatalysts

et al. 2014

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The application of various earth-abundant Ni species, such as NiS, Ni, Ni(OH)2 , and NiO, as a co-catalyst in a Znx Cd1-x S system for visible-light photocatalytic H2 production was investigated for the first time. The loading of Ni or NiS enhanced the photocatalytic activity of Znx Cd1-x S because they could promote the electron transfer at the interface with Znx Cd1-x S and catalyze the H2 evolution. Surprisingly, Ni(OH)2 -loaded Znx Cd1-x S exhibits a very high photocatalytic H2 -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 Znx Cd1-x S because of their unmatched conduction band positions. This paper reports the optimization of the Znx Cd1-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 H2 -production activity for the first time and also reveals the roles of these Ni species in the photocatalytic activity.

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supporting

confidence: 72%

Enhanced Visible‐Light Photocatalytic H₂ Production by Zn_xCd_1−xS Modified with Earth‐Abundant Nickel‐Based Cocatalysts

et al. 2014

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“…As shown in Figure 2 , a broad emission peak was found around 470 nm, corresponding to the band-to-band transition of the photoinduced charge carriers in g-C 3 N 4 . [ 40,41 ] When compared to the pure g-C 3 N 4 , the PL intensity for the g-C 3 N 4 /Ag@SiO 2 photocatalysts gradually decreased with the narrowing of the nanogap ( i.e. , the distance between g-C 3 N 4 and Ag NPs), meaning the gradually reduced charge carrier recombination.…”

Section: Resultsmentioning

confidence: 98%

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Chen

Dong

et al. 2015

Adv Materials Inter

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of pure g-C 3 N 4 for hydrogen production was relatively low, although the band gap ( E g ≈ 2.7 eV) and band positions of g-C 3 N 4 match well with the intrinsic requisites for photocatalytic water splitting under visible light. [ 6,8 ] To this end, previous attempts have been mainly focused on improving charge carrier migration and separation in g-C 3 N 4 via three aspects: (1) constructing band structure aligned heterojunctions between g-C 3 N 4 and other semiconductor photocatalysts (Cu 2 O, [ 10 ] N-CeO x , [ 11 ] ZnFe 2 O 4 , [ 12 ] CNS, [ 13 ] etc.) for effi cient charge separation, (2) combining g-C 3 N 4 with conductive materials (graphene, [ 14 ] CNTs, [ 15 ] etc.), and (3) designing unique nanostructures (nanorods, [ 16,17 ] nanosheets, [ 18,19 ] mesoporous nanostructures, [20][21][22] etc.) for fast charge carrier migration. However, the photocatalytic effi ciencies of these modifi ed g-C 3 N 4 were still not high enough for practical applications in effi cient solar energy conversion systems.It has been well established that the mismatch between the relatively long penetration depth of photons and the short mean free path of charge carriers signifi cantly account for the high-rate recombination of electrons and holes in semiconductors. [ 23,24 ] Therefore, the charge carrier recombination could be effectively inhibited if the travel distance for charge carriers to transfer to the surface active sites is minimized. Recent development of photocatalysts modifi ed with plasmonic nanostructures of noble metals (such as Au, [25][26][27][28] Ag, [ 29,30 ] etc.) offered a new opportunity to fulfi ll this strategy. These metal nanoparticles (NPs) characteristic of the localized surface plasmon resonance (LSPR) effect can act as nanoantennas for light trapping and form a locally enhanced electromagnetic fi eld in the proximity of the metal NPs. Under irradiation, especially when the LSPR absorption of the metal NPs is partially overlapped with the optical absorption of the semiconductor, [31][32][33] the LSPR induced plasmon resonance energy transfer (PRET) from the plasmonic metal to the nearby semiconductor will preferentially excite charge carriers in the metal/semiconductor interface, namely, the near-surface region of the semiconductor. Then the transfer distance of the photoexcited charge carriers to the surface reactive sites for photocatalytic reactions would be shortened. Watanabe and co-workers demonstrated that the enhanced photocatalytic activity over Ag NPs incorporated TiO 2 photocatalyst was achieved by the LSPR induced electromagnetic fi eld amplitude of Ag NPs. [ 34 ] The consequent PRET effect favored the charge carrier formation in the near-surface region of TiO 2 , thus the

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“…This implies the formation of an interfacial junctionand asynergistic effect. [35][36][37] Furthermore, MoS 2 also shows good lattice matching with GL-C 3 N 4 , [38] which could enhance light harvesting, accelerate the formation of intimate interface contact, and promote photogenerated charges eparationa cross the interfaces. [39] In this work, layered semiconductor GL-MoS 2 has been used in combination with GL-C 3 N 4 to obtain improved photocatalytic activity.T his2 Dm aterial has been used as as ubstitute for noble metalsi ns ynthesizing photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Construction of a 2D Graphene‐Like MoS₂/C₃N₄ Heterojunction with Enhanced Visible‐Light Photocatalytic Activity and Photoelectrochemical Activity

Yan

Chen

et al. 2016

Chemistry A European J

151

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How would you briefly describe your research? In this research, GL-MoS 2 /C 3 N 4 has been successfully synthesized via an easy solvothermal method. It exhibited much higher photo-catalytic performance than that of GL-MoS 2 and GL-C 3 N 4 .T he face-to-face combination could promote both al ight response and electron-hole pair separation, so high photocatalytic activity could be achieved. In addition to its high stability,n on-toxicity,a nd strong photo-response, the composites could also be utilized in sensitive detection of trace amounts of Cu 2 + ions. It offered an easy technique for trace heavy-metal ion analysis and detection. What was the inspiration for this cover design? Inspired by the urgency for protecting the environment and making full use of solar energy resources, low-cost and high-pho-tocatalytic-efficiency materials for degradation of pollutants have been designed. Presented in the cover picture, under visible-light irradiation, the layer-contacted GL-MoS 2 /C 3 N 4 composites can turn domestic waste water and industrial sewage into clean water,a nd discharge it into the environment. It shows that human beings possess the wisdom and power for solving environmental problems , and also for creating abeautiful world by our own hands. What prompted you to investigate this topic/problem? 2D nanomaterials have attracted attention due to their unique electronic and optical properties. Typical 2D nanomaterials, such as GL-C 3 N 4 and GL-MoS 2 ,s howed excellent mechanical, novelty catalytic , thermal, and optical properties. GL-MoS 2 has large specific surface area, which ensures fast transport of electrons produced from GL-C 3 N 4 .B ased on this, GL-C 3 N 4 has been modified with GL-MoS 2 for the improvement of the photocatalytic activity.A bove all, it intimates that the interfacial junction demonstrates as ynergetic effect. Invited for the cover of this issue is the group of Huaming Li and Hui Xu at the Jiangsu University.T he image depicts GL-MoS 2 /C 3 N 4 as ak ind of stable, non-toxic,a nd highly efficient photocatalyst for the degradationo fp ollutants. Read the full text of the article at

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Layered Nanojunctions for Hydrogen‐Evolution Catalysis

Cited by 815 publications

References 56 publications

Enhanced Visible‐Light Photocatalytic H₂ Production by Zn_xCd_1−xS Modified with Earth‐Abundant Nickel‐Based Cocatalysts

Enhanced Visible‐Light Photocatalytic H₂ Production by Zn_xCd_1−xS Modified with Earth‐Abundant Nickel‐Based Cocatalysts

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Construction of a 2D Graphene‐Like MoS₂/C₃N₄ Heterojunction with Enhanced Visible‐Light Photocatalytic Activity and Photoelectrochemical Activity

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Layered Nanojunctions for Hydrogen‐Evolution Catalysis

Cited by 815 publications

References 56 publications

Enhanced Visible‐Light Photocatalytic H2 Production by ZnxCd1−xS Modified with Earth‐Abundant Nickel‐Based Cocatalysts

Enhanced Visible‐Light Photocatalytic H2 Production by ZnxCd1−xS Modified with Earth‐Abundant Nickel‐Based Cocatalysts

Nanogap Engineered Plasmon‐Enhancement in Photocatalytic Solar Hydrogen Conversion

Construction of a 2D Graphene‐Like MoS2/C3N4 Heterojunction with Enhanced Visible‐Light Photocatalytic Activity and Photoelectrochemical Activity

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Enhanced Visible‐Light Photocatalytic H₂ Production by Zn_xCd_1−xS Modified with Earth‐Abundant Nickel‐Based Cocatalysts

Enhanced Visible‐Light Photocatalytic H₂ Production by Zn_xCd_1−xS Modified with Earth‐Abundant Nickel‐Based Cocatalysts

Construction of a 2D Graphene‐Like MoS₂/C₃N₄ Heterojunction with Enhanced Visible‐Light Photocatalytic Activity and Photoelectrochemical Activity