Mo2C@NC nanowire bundle for efficient electrocatalytic hydrogen evolution

Chakrabartty, Sukanta; Raj, C. Retna

doi:10.1016/j.ijhydene.2018.09.012

Cited by 23 publications

(16 citation statements)

References 54 publications

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“…The performance of 2.0G4.0TMo1.0 is inferior to those of the carbide/ sulfide/Mo-based catalysts. [33][34][35] However, the synthesis strategy of 2.0G4.0TMo1.0 is a solvent-free process, which opens up a novel mothed to prepare porous electrocatalysts.…”

Section: Resultsmentioning

confidence: 99%

A Solvent‐Free Strategy to Synthesize MoS₂/Mo₂C‐Embedded, N, S Co‐Doped Mesoporous Carbon as Electrocatalysts for Hydrogen Evolution

Miao

Zhang

et al. 2021

ChemistrySelect

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A solvent-free strategy was developed to synthesize MoS 2 / Mo 2 C embedded, N, S co-doped carbon via a green and environmentally friendly process. The precursors were blended and carbonized under the inert atmosphere. Water and other solvents were not involved in the whole synthesis process. According to the characterization results, the as-received samples consisted of Mo 2 C, MoS 2 , and carbon with mesoporous structures. Moreover, the obtained sample possessed a high BET surface area (373.3 m 2 g À 1 ), as well as high electrochemical active surface area (145.4 mF cm À 2 ). When utilized as the electrocatalyst towards hydrogen evolution reaction (HER), the optimal sample of T2.0G4.0Mo1.0 revealed superior electrochemical activity in alkaline media, which could show a low overpotential and an excellent stability.

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Section: Resultsmentioning

confidence: 99%

A Solvent‐Free Strategy to Synthesize MoS₂/Mo₂C‐Embedded, N, S Co‐Doped Mesoporous Carbon as Electrocatalysts for Hydrogen Evolution

Miao

Zhang

et al. 2021

ChemistrySelect

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“…[16] Among these materials, transition metal sulfide has good electric conductivity, chemical stability and good catalytic performance. [17][18][19][20][21][22][23][24] The composite material composed of transition metal sulfide and mesoporous carbon possesses excellent chemical stability and extensive catalytically active site, which exhibits outstanding electrocatalytic activity towards HER. [25,26] The synthesis of mesoporous carbon involves the utilization of templates, high-temperature carbonization, and removal of porogens.…”

Section: Introductionmentioning

confidence: 99%

A Molten‐Salt Method to Synthesize Co₉S₈ Embedded, N, S Co‐Doped Mesoporous Carbons from Melamine Formaldehyde Resins for Electrocatalytic Hydrogen Evolution Reactions

Miao

Cui

et al. 2022

ChemPlusChem

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We developed a molten salts process to prepare Co9S8 nanoparticles (NPs) entrapped, S, N co‐doped carbons. Cobalt chloride was used as the cobalt source. The melamine‐formaldehyde (MF) resin provided the carbon source and nitrogen source, and thiourea provided sulfur source. In addition, common inorganic salts were added as templates to generate pores. The characterization results showed that the prepared materials contained high contents of N, S and Co, and were mesoporous composites. At the same time, the porosity of electrocatalyst depended on the type of salt and the mass ratio of precursor to salt, which further affected the electrocatalytic activity of hydrogen evolution reaction (HER). The best prepared catalyst showed excellent HER performance. The onset overpotential of the catalyst was low (33 mV) and had a small Tafel slope (61.1 mV dec−1), in addition to good stability in alkaline media.

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“…24−29 Doping of the carbon framework with a heteroatom can modulate the electron density and further increases the conductivity and activity. 30,31 The synergistic effect between the active catalyst and the heteroatom-doped carbon coating create more catalytically active sites for HER. The choice of metal and carbon precursors and phosphorus source are very important in achieving the ideal integration/encapsulation of the catalyst with the carbon support.…”

Section: Introductionmentioning

confidence: 99%

General Approach for the Synthesis of Nitrogen-Doped Carbon Encapsulated Mo and W Phosphide Nanostructures for Electrocatalytic Hydrogen Evolution

Chakrabartty

Sahu

Raj

2020

ACS Appl. Energy Mater.

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A general strategy for the synthesis of the core-shell nanostructure of nitrogen-doped carbon encapsulated MoP and WP (MoP@NC and WP@NC) and the electrochemical hydrogen evolution reaction (HER) are demonstrated. The synthetic procedure involves the self-assembling of polyoxometalate (M = Mo/W) and phytic acid on a polyetheleneimine backbone and the subsequent pyrolysis of the self-assembled supramolecular aggregates in an inert atmosphere without a traditional phosphidating agent. MoP@NC has a quasi-spherical shape with a MoP core (57 nm) and nitrogen doped porous carbon shell, whereas WP@ NC has a nitrogen-doped carbon coated rodlike nanostructure. MoP@NC has a large amount of pyridinic (∼59%) and Mo-bonded (∼33%) nitrogen. MoP@NC is highly active toward hydrogen evolution reaction (HER) and delivers the benchmark current density 10 mA/cm 2 at an overpotential of 52, 106, and 171 mV in acidic, alkaline and neutral pH, respectively. It shows a Tafel slope of 49 mV/dec, high turnover frequency (0.28 s −1 at η = 100 mV), and faradaic efficiency (96%) in acidic electrolyte. MoP@NC has remarkable durability in acidic and alkaline pH with a negligible increase in overpotential after 1000 extensive repeated potential cycles. The encapsulating nitrogen-doped carbon shell protects the active catalyst from corrosion and the catalyst retains its phase purity and structural integrity even after 10 h of long-time hydrogen evolution at constant potential. The outstanding HER activity of MoP@NC is accounted for by the small particle size, large surface area, and strong chemical coupling between MoP and nitrogendoped carbon.

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Mo2C@NC nanowire bundle for efficient electrocatalytic hydrogen evolution

Cited by 23 publications

References 54 publications

A Solvent‐Free Strategy to Synthesize MoS₂/Mo₂C‐Embedded, N, S Co‐Doped Mesoporous Carbon as Electrocatalysts for Hydrogen Evolution

A Solvent‐Free Strategy to Synthesize MoS₂/Mo₂C‐Embedded, N, S Co‐Doped Mesoporous Carbon as Electrocatalysts for Hydrogen Evolution

A Molten‐Salt Method to Synthesize Co₉S₈ Embedded, N, S Co‐Doped Mesoporous Carbons from Melamine Formaldehyde Resins for Electrocatalytic Hydrogen Evolution Reactions

General Approach for the Synthesis of Nitrogen-Doped Carbon Encapsulated Mo and W Phosphide Nanostructures for Electrocatalytic Hydrogen Evolution

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Mo2C@NC nanowire bundle for efficient electrocatalytic hydrogen evolution

Cited by 23 publications

References 54 publications

A Solvent‐Free Strategy to Synthesize MoS2/Mo2C‐Embedded, N, S Co‐Doped Mesoporous Carbon as Electrocatalysts for Hydrogen Evolution

A Solvent‐Free Strategy to Synthesize MoS2/Mo2C‐Embedded, N, S Co‐Doped Mesoporous Carbon as Electrocatalysts for Hydrogen Evolution

A Molten‐Salt Method to Synthesize Co9S8 Embedded, N, S Co‐Doped Mesoporous Carbons from Melamine Formaldehyde Resins for Electrocatalytic Hydrogen Evolution Reactions

General Approach for the Synthesis of Nitrogen-Doped Carbon Encapsulated Mo and W Phosphide Nanostructures for Electrocatalytic Hydrogen Evolution

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A Solvent‐Free Strategy to Synthesize MoS₂/Mo₂C‐Embedded, N, S Co‐Doped Mesoporous Carbon as Electrocatalysts for Hydrogen Evolution

A Solvent‐Free Strategy to Synthesize MoS₂/Mo₂C‐Embedded, N, S Co‐Doped Mesoporous Carbon as Electrocatalysts for Hydrogen Evolution

A Molten‐Salt Method to Synthesize Co₉S₈ Embedded, N, S Co‐Doped Mesoporous Carbons from Melamine Formaldehyde Resins for Electrocatalytic Hydrogen Evolution Reactions