Decoration of MoS2 on g-C3N4 surface for efficient hydrogen evolution reaction

Fageria, Pragati; Sudharshan, K.Y.; Nazır, Roshan; Basu, Mrinmoyee; Pande, Surojit

doi:10.1016/j.electacta.2017.11.184

Cited by 74 publications

(23 citation statements)

References 46 publications

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“…The results clearly reveal that CN‐S(3:2) can facilitate the HER process and has higher electrocatalytic performance. The HER activity is comparable to other catalysts in 0.5 mol L −1 H 2 SO 4 as summarized in Table . Figure S5 shows the HER performance of all the samples obtained from precursors that were treated with different molar ratios of NaOH to melamine, CN‐S(3:2) exhibits higher HER activity than the others.…”

Section: Resultssupporting

confidence: 52%

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

Luo

Zhang

Han

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Sustainable production of oxygen and hydrogen via catalyst-aided water splitting utilizing solar energy has attracted increasing interest. The primary issue in this field is the development of earth-abundant and active photoelectrocatalytic materials. Herein, a novel hierarchical g-C 3 N 4 /g-C 3 N 4 metal-free homojunction catalyst is synthesized through partial hydrolysis of melamine in alkali and subsequent thermal treatment.RESULTS: The hierarchical g-C 3 N 4 /g-C 3 N 4 metal-free homojunction composed of lamellas features large exposed surface area, abundant interface contact and more channels for mass transfer, making it highly effective for water splitting with a small overpotential of 500 mV at 10 mA cm −2 and low Tafel slope of 93.1 mV dec −1 for oxygen evolution reaction (OER) in 1.0 mol L −1 potassium hydroxide (KOH) solution, as well as 259 mV at 10 mA cm −2 and 109.33 mV dec −1 for hydrogen evolution reaction (HER) in 0.5 mol L −1 sulfuric acid (H 2 SO 4 ) solution. Furthermore, the overpotential and Tafel slope further decrease to 383.4 mV and 69.52 mV dec −1 for OER, 150.1 mV and 67.93 mV dec −1 for HER upon visible light irradiation, demonstrating the exceptional photo-responsive catalytic performance, which can be attributed to the direct Z-scheme homojunction resulting in effective charge transfer and •OH and superoxide free radicals produced under visible light irradiation.CONCLUSION: This work provides a facile but effective approach for the construction of metal-free OER/HER bifunctional catalyst with high photo-responsive performance, achieving higher activity for catalyst-assisted water splitting.

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Section: Resultssupporting

confidence: 52%

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

Luo

Zhang

Han

et al. 2019

J of Chemical Tech & Biotech

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“…Lateral size and width of the thin sheets can be determined from the high magnification TEM images which is ∼100 to 200 nm and ∼20 nm respectively. Figure b shows the HRTEM image of MoS 2 sheets which dictates that the lattice spacing is 0.64 nm which corresponds to the spacing between two (002) plane . Figure S7 shows the EDS area mapping which confirms the uniform distribution of Mo and S as element in sheet structure.…”

Section: Resultsmentioning

confidence: 99%

AgPd Alloy Nanoparticles Decorated MoS₂ 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

2019

Self Cite

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2D nanosheets of different metal chalcogenides have attracted potential interest due to their appealing physical and chemical properties. In this present study we have developed a novel approach for the synthesis of 2D sheets of MoS 2 following a simple hydrothermal method. Using a simple wet-chemical route, surface of 2D sheets of MoS 2 are modified with AgPd alloy nanoparticles following galvanic exchange technique. Electrocatalytic activity towards hydrogen evolution reaction (HER) of MoS 2 , MoS 2 /Ag, and AgPd alloy was checked in a wide range of pH condition. In 0.5 M H 2 SO 4 , bare MoS 2 nanosheets can generate 10 mA/cm 2 current density upon application of only À 0.329 V vs. reversible hydrogen electrode (RHE). After successful decoration of Ag nanoparticle, MoS 2 /Ag shows improved activity compared to bare MoS 2 sheets. MoS 2 /Ag can generate current density 10 mA/cm 2 only by applying À 0.299 V vs. RHE. Further MoS 2 /AgPd-1 can generate 10 mA/cm 2 current density upon application of À 0.229 V vs. RHE. So, from the result it is clear that the successive inclusion of Pd in place of Ag results in higher electrocatalytic activity. Again, MoS 2 /AgPd-2 can generate 10 mA/cm 2 current density upon application of only À 0.215 V vs. RHE. All the metal and alloy nanoparticle decorated MoS 2 show excellent stability in hydrogen evolution reaction. MoS 2 , MoS 2 /AgPd-1 and MoS 2 /AgPd-2 can generate unaltered current density up to 30 h.[a] M.

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“…Furthermore, the internal electrostatic field established in the heterostructure can separate the charges, thus decreasing the recombination rate of photogenerated carriers. Various MoS 2 -based heterostructures like MoS 2 /WS 2 , MoS 2 /ZnO, MoS 2 /PbS, and MoS 2 /C 3 N 4 have been successfully fabricated as promising materials for photocatalysts [22][23][24][25]. Among these, cadmium sulfide (CdS) has recently received great interest owing to its direct suitable bandgap of 2.4 eV [26,27], which can be excited by the visible light of the solar spectrum to effectively generate charge carriers.…”

Section: Introductionmentioning

confidence: 99%

MoS2/CdS Heterostructure for Enhanced Photoelectrochemical Performance under Visible Light

Zhang

2019

Catalysts

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High-rate recombination of photogenerated electron and hole pairs will lead to low photocatalytic activity. Constructing heterostructure is a way to address this problem and thus increase the photoelectrochemical performance of the photocatalysts. In this article, molybdenum sulfide (MoS2)/cadmium sulfide (CdS) nanocomposites were fabricated by a facile solvothermal method after sonication. The CdS nanoparticles immobilized on the MoS2 sheet retained the original crystal structure and morphology. The composites exhibit higher photoelectrochemical properties compared with pure MoS2 nanosheets or CdS powder. When the precursor concentration of CdS is 0.015 M, the MoS2/CdS composites yield the highest photocurrent, which is enhanced nearly five times compared with pure CdS or MoS2. The improved photoelectrochemical performance can be ascribed to the increase of light harvest, as well as to the heterostructure that decreases the recombination rate of the photogenerated electron and hole pairs.

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Decoration of MoS2 on g-C3N4 surface for efficient hydrogen evolution reaction

Cited by 74 publications

References 46 publications

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

AgPd Alloy Nanoparticles Decorated MoS₂ 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

MoS2/CdS Heterostructure for Enhanced Photoelectrochemical Performance under Visible Light

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Decoration of MoS2 on g-C3N4 surface for efficient hydrogen evolution reaction

Cited by 74 publications

References 46 publications

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

In situ construction of hierarchical graphitic carbon nitride homojunction as robust bifunctional photoelectrocatalyst for overall water splitting

AgPd Alloy Nanoparticles Decorated MoS2 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition

MoS2/CdS Heterostructure for Enhanced Photoelectrochemical Performance under Visible Light

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AgPd Alloy Nanoparticles Decorated MoS₂ 2D Nanosheets: Efficient Hydrogen Evolution Catalyst in Wide pH Condition