Mo2C based electrocatalyst with nitrogen doped three-dimensional mesoporous carbon as matrix, synthesis and HER activity study

An, Kaili; Xu, Xinxin

doi:10.1016/j.electacta.2018.10.050

Cited by 37 publications

(8 citation statements)

References 49 publications

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“…Various methods have been employed to prepare TMC-based catalysts (Wu et al, 2016; Zhu et al, 2016; An and Xu, 2019). Gong et al obtained WC x /MoC x -based electrocatalysts by carbonizing W/WO 3 or Mo/MoO 3 under the flow of carbon precursors (C 2 H 6 , CH 4 , or CO, and H 2 ), but very low surface areas were obtained (Gong et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Mo2C and W2C Nanoparticle Electrocatalysts for the Efficient Hydrogen Evolution Reaction in Alkali and Acid Electrolytes

et al. 2019

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The synthesis of low cost, high efficacy, and durable hydrogen evolution electrocatalysts from the non-noble metal group is a major challenge. Herein, we establish a simple and inexpensive chemical reduction method for producing molybdenum carbide (Mo2C) and tungsten carbide (W2C) nanoparticles that are efficient electrocatalysts in alkali and acid electrolytes for hydrogen evolution reactions (HER). Mo2C exhibits outstanding electrocatalytic behavior with an overpotential of −134 mV in acid medium and of −116 mV in alkaline medium, while W2C nanoparticles require an overpotential of −173 mV in acidic medium and −130 mV in alkaline medium to attain a current density of 10 mA cm−2. The observed results prove the capability of high- and low-pH active electrocatalysts of Mo2C and W2C nanoparticles to be efficient systems for hydrogen production through HER water electrolysis.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Mo2C and W2C Nanoparticle Electrocatalysts for the Efficient Hydrogen Evolution Reaction in Alkali and Acid Electrolytes

et al. 2019

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“…To further enhance the reaction kinetics, a mesoporous carbon matrix with a 3D architecture was prepared by the calcination of ammonium heptamolybdate and rice paper. Owing to the fast diffusion of charge/mass through the channel rich interfaces, large exposed surface area and abundant active sites for adsorption and reaction, the Mo 2 C embedded in 3D mesoporous carbons exhibited a low overpotential of 155 and 78 mV at 10 mA•cm −2 and a small Tafel slope of 73 and 64 mV•dec −1 in 0.5 M H 2 SO 4 and 1 M KOH, respectively, with a stable catalytic activity over 10 h and 2000 runs (Table 1) [62].…”

Section: Coupling With Mesoporous Carbonsmentioning

confidence: 99%

Smart Designs of Mo Based Electrocatalysts for Hydrogen Evolution Reaction

et al. 2021

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As a sustainable and clean energy source, hydrogen can be generated by electrolytic water splitting (i.e., a hydrogen evolution reaction, HER). Compared with conventional noble metal catalysts (e.g., Pt), Mo based materials have been deemed as a promising alternative, with a relatively low cost and comparable catalytic performances. In this review, we demonstrate a comprehensive summary of various Mo based materials, such as MoO2, MoS2 and Mo2C. Moreover, state of the art designs of the catalyst structures are presented, to improve the activity and stability for hydrogen evolution, including Mo based carbon composites, heteroatom doping and heterostructure construction. The structure–performance relationships relating to the number of active sites, electron/ion conductivity, H/H2O binding and activation energy, as well as hydrophilicity, are discussed in depth. Finally, conclusive remarks and future works are proposed.

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“…The ultrasmall sizes of nanocrystals (mixed Mo 2 C and Mo 2 N, Mo 2 C/Mo 2 N heterostructure) in Mo 2 C/Mo 2 N@N-CNFs, correspond to the result of broad peaks in XRD, which is beneficial for the exposure of active sites on surface, improving the utilization of the catalyst. Meanwhile, the N-doped carbon coating guarantees fast electron transfer and structural stability during long-time reaction [16,42,43].…”

Section: Science China Materialsmentioning

confidence: 99%

Melamine-assisted synthesis of ultrafine Mo2C/Mo2N@N-doped carbon nanofibers for enhanced alkaline hydrogen evolution reaction activity

et al. 2020

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Noble metal-free electrocatalysts with high activity are highly desirable for the large-scale application of hydrogen evolution reaction (HER). Mo 2 C-based nanomaterials have been proved as a promising alternative to noble metal-based electrocatalysts owing to the Pt-resembled d-band density and optimal intermediates-adsorption properties. However, the aggregation and excessive growth of crystals often occur during their high-temperature synthesis procedure, leading to low catalytic utilization. In this study, the ultrafine Mo 2 C/Mo 2 N heterostructure with large surface and interface confined in the N-doped carbon nanofibers (N-CNFs) was obtained by a melamine-assisted method. The synergistic effect of Mo 2 C/Mo 2 N heterostructure and plenty active sites exposed on the surface of ultrafine nanocrystals improves the electrocatalytic activity. Meanwhile, the N-CNFs ensure fast charge transfer and high structural stability during reactions. Moreover, the in-situ synthesis method strengthens the interfacial coupling interactions between Mo 2 C/Mo 2 N heterostructure and N-CNFs, further enhancing the electronic conductivity and electrocatalytic activity. Owing to these advantages, Mo 2 C/Mo 2 N@N-CNFs exhibit excellent HER performance with a low overpotential of 75 mV at a current density of 10 mV cm −2 in alkaline solution, superior to the single-phased Mo 2 C counterpart and recently reported Mo 2 C/ Mo 2 N-based catalysts. This study highlights a new effective strategy to design efficient electrocatalysts via integrating heterostructure, nanostructure and carbon modification.

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Mo2C based electrocatalyst with nitrogen doped three-dimensional mesoporous carbon as matrix, synthesis and HER activity study

Cited by 37 publications

References 49 publications

Synthesis of Mo2C and W2C Nanoparticle Electrocatalysts for the Efficient Hydrogen Evolution Reaction in Alkali and Acid Electrolytes

Synthesis of Mo2C and W2C Nanoparticle Electrocatalysts for the Efficient Hydrogen Evolution Reaction in Alkali and Acid Electrolytes

Smart Designs of Mo Based Electrocatalysts for Hydrogen Evolution Reaction

Melamine-assisted synthesis of ultrafine Mo2C/Mo2N@N-doped carbon nanofibers for enhanced alkaline hydrogen evolution reaction activity

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