Transferable Active Centers of Strongly Coupled MoS2@Sulfur and Molybdenum Co-doped g-C3N4 Heterostructure Electrocatalysts for Boosting Hydrogen Evolution Reaction in Both Acidic and Alkaline Media

Zhang, Beiyi; Li, Junqi; Song, Qianqian; Xu, Xiaotao; Hou, Wenfei; Liu, Hui

doi:10.1021/acs.inorgchem.0c03485

Cited by 24 publications

(13 citation statements)

References 54 publications

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“…However, CoP@N-VGNHs work quite efficiently in an alkaline electrolyte and achieve an overpotential comparable to that of Pt/C at low current densities (Pt/C η 10 = 48 mV and CoP@N-VGNHs η 10 = 87 mV) (Figure b). Except noble metal complexes such as Ru@NC or Ir_VG, our hybrid catalyst is either comparable to N–F–CoP/NF and MoCoP/MWCNTs or far better than earth-abundant metal carbides, phosphide, or nitrides such as Mo 2 C, CoP, Ni 2 P, MoS 2 @Mo–S–C 3 N 4 , γ-Mo 2 N, and so forth. ,− The LSV data indicate that CoP@N-VGNHs beat Pt/C beyond 100 mA cm –2 , implying a practical competitiveness in alkaline HER. The Tafel slope is an intrinsic property of the catalyst that can be evaluated from the LSV data.…”

Section: Resultsmentioning

confidence: 90%

Highly Desirable Platform for Efficient Hydrogen Generation: Electrodeposited CoP on N-Doped Vertical Graphene

Roy

Truong

Jeon

et al. 2021

ACS Appl. Energy Mater.

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Vertically oriented graphene nanohills (VGNHs) have been used to boost the hydrogen evolution reaction (HER) activities of various catalysts. To further enhance the HER efficiency, a chemical modification was applied to VGNHs, and a significant improvement was observed in this work. Specifically, the catalytic performances of electrodeposited CoP on as-grown VGNHs (CoP@VGNHs) and on HNO 3 -treated VGNHs (CoP@N−VGNHs) were compared. The HER performances of the CoP@N−VGNH hybrid were even superior to those of noble metals, manifesting low overpotentials (η 10 = 30 mV in acid and η 10 = 87 mV in alkali), fast electron transfer, and durability in both acidic and alkaline electrolytes. This emphasizes the potential of physically and chemically modified graphene in the realm of water electrolysis.

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Section: Resultsmentioning

confidence: 90%

Highly Desirable Platform for Efficient Hydrogen Generation: Electrodeposited CoP on N-Doped Vertical Graphene

Roy

Truong

Jeon

et al. 2021

ACS Appl. Energy Mater.

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“…[ 25 ] In Figure 2c,d, the crystal plane spacing (0.64 nm) of (002) plane and lattice fringe (0.27 nm) in the (100) plane of MoS 2 were clearly observed. [ 26,27 ] In order to observe the distribution of Cu and MoS 2 in CN–Cu–MS, elemental mapping and energy dispersion spectrum (EDS) analysis were performed, as shown in Figure S1 (see Supporting Information). Figure S1b–f in the Supporting Information shows that C, N, Cu, S, and Mo elements are evenly distributed in CN–Cu–MS.…”

Section: Resultsmentioning

confidence: 99%

Efficient Charge Transfer in Z‐Scheme g‐C₃N₄/Cu/MoS₂ Heterojunctions for Enhanced Photocatalysis and Photoenhanced Electrocatalysis

Zhu

Wang

Luan

et al. 2022

Adv Materials Inter

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properties make its structure diverse and shapeable. [6] However, the application of bulk CN in photocatalysis is still limited due to its low conductivity, high recombination rate of carriers and holes and small specific surface area. [7,8] Various modification methods such as element doping, morphology control, and heterogeneous structure design have been tried to enhance the charge transfer kinetics and inhibit the recombination of carriers, so as to improve the optical and electrochemical capabilities. [9,10] Doping metal elements (such as Au, Pt, Cu) in CN is a simple and effective modification strategy, which can greatly improve the conductivity of CN and promote charge transfer. [11][12][13][14] Li et al. doped Pt ions into CN, changing the charge transport path and making CN have infrared absorption. [15] It is worth mentioning that due to the surface plasmon resonance effect of Au, Pt, Cu, and other metals, it can be used as an electronic conductor to participate in the construction of Z-scheme heterojunction. [16][17][18] In the application of photocatalytic hydrogen production, CN must rely on precious metals such as Pt as cocatalyst to play a role, but this requires high cost. It was found that transition metal dichalcogenides such as MoS 2 , CoP, and Ni 2 P were considered as cheap substitutes for noble metal catalysts because Gibbs free energy was close to Pt. [19][20][21] Moreover, when it forms a heterojunction with CN, the charge transfer rate is able to accelerate through the coupling force between the interfaces, so as to avoid its recombination with holes. Such as Luo et al. prepared CoP/CN composite, CoP as cocatalyst, the hydrogen production rate under visible light irradiation reached 1.074 mmol h −1 g −1 . [22] In this paper, CN/Cu/MoS 2 (CN-CU-MS) Z-scheme heterojunctions were successfully constructed. As an electronic conductor, Cu changed the original II-type transmission path between CN and MoS 2 into Z-scheme transfer, which greatly increased the charge transfer rate and more effectively inhibits the recombination of charges. The existence and interaction of Cu and MoS 2 were verified by morphology and structure characterization. Through the photocatalytic hydrogen production test of the samples, it was found that the hydrogen production rate of CN-CU-MS was 2.63 times that of CN/MoS 2 (CN-MS), which was also much higher than that of CN/MoS 2 /Cu(CN-MS-Cu).Efficient charge separation and transfer is always an important prerequisite for efficient photocatalysis. Herein, g-C 3 N 4 /Cu/MoS 2 Z-scheme heterojunctions are successfully constructed by a two-step calcination method, in which Cu nanoparticles are embedded as an electronic conductor between g-C 3 N 4 and MoS 2 . g-C 3 N 4 /Cu/MoS 2 composites reveal excellent photocatalytic activity. The rate of hydrogen production reaches to 970.5 µmol g −1 h −1 , which is 22 and 2.63 times of that of g-C 3 N 4 and g-C 3 N 4 /MoS 2 , respectively. Meanwhile, due to the significant enhancement of the conductivity of g-C 3 N 4 /Cu/MoS 2 and the ...

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“…The construction of heterostructured composites is an effective way to enhance the activity of MoS 2 . [171][172][173][174][175][176][177][178][179][180][181] Wei et al 182 synthesized core-shell structured CoS 2 @MoS 2 by a hydrothermal method. As shown in Fig.…”

Section: Formation Of Heterostructurementioning

confidence: 99%

Strategies to improve electrocatalytic performance of MoS₂-based catalysts for hydrogen evolution reactions

et al. 2022

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Transferable Active Centers of Strongly Coupled MoS₂@Sulfur and Molybdenum Co-doped g-C₃N₄ Heterostructure Electrocatalysts for Boosting Hydrogen Evolution Reaction in Both Acidic and Alkaline Media

Cited by 24 publications

References 54 publications

Highly Desirable Platform for Efficient Hydrogen Generation: Electrodeposited CoP on N-Doped Vertical Graphene

Highly Desirable Platform for Efficient Hydrogen Generation: Electrodeposited CoP on N-Doped Vertical Graphene

Efficient Charge Transfer in Z‐Scheme g‐C₃N₄/Cu/MoS₂ Heterojunctions for Enhanced Photocatalysis and Photoenhanced Electrocatalysis

Strategies to improve electrocatalytic performance of MoS₂-based catalysts for hydrogen evolution reactions

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Transferable Active Centers of Strongly Coupled MoS2@Sulfur and Molybdenum Co-doped g-C3N4 Heterostructure Electrocatalysts for Boosting Hydrogen Evolution Reaction in Both Acidic and Alkaline Media

Cited by 24 publications

References 54 publications

Highly Desirable Platform for Efficient Hydrogen Generation: Electrodeposited CoP on N-Doped Vertical Graphene

Highly Desirable Platform for Efficient Hydrogen Generation: Electrodeposited CoP on N-Doped Vertical Graphene

Efficient Charge Transfer in Z‐Scheme g‐C3N4/Cu/MoS2 Heterojunctions for Enhanced Photocatalysis and Photoenhanced Electrocatalysis

Strategies to improve electrocatalytic performance of MoS2-based catalysts for hydrogen evolution reactions

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Product

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Transferable Active Centers of Strongly Coupled MoS₂@Sulfur and Molybdenum Co-doped g-C₃N₄ Heterostructure Electrocatalysts for Boosting Hydrogen Evolution Reaction in Both Acidic and Alkaline Media

Efficient Charge Transfer in Z‐Scheme g‐C₃N₄/Cu/MoS₂ Heterojunctions for Enhanced Photocatalysis and Photoenhanced Electrocatalysis

Strategies to improve electrocatalytic performance of MoS₂-based catalysts for hydrogen evolution reactions