MoS2/Co9S8/MoC heterostructure connected by carbon nanotubes as electrocatalyst for efficient hydrogen evolution reaction

Wang, Meng; Jian, Kailiang; Lv, Zepeng; Liu, Dong; Fan, Gangqiang; Zhang, Run; Dang, Jie

doi:10.1016/j.jmst.2020.11.040

Cited by 36 publications

(16 citation statements)

References 36 publications

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“…It can be clearly seen that the binding energies of H and H 2 O are crucial criteria for alkaline HER, and they could act as the descriptors for the HER activity in alkaline solutions. The optimum value of Δ G H* is 0 eV. − Thus, to further probe the HER catalytic performance, we further performed density functional theory (DFT) calculations of the Gibbs free energy of hydrogen adsorption (Δ G H* ) (Figure b) for various hydrogen adsorption sites based on the corresponding models (Figure S11a,d). In Figure b, we find that the Δ G H* of the S site near the N atom of N–MoS 2 /Ti 3 C 2 T X (0.70 eV) is closer to 0 than that of MoS 2 /Ti 3 C 2 T X (1.86 eV), which indicates that the doping of nitrogen stimulates the catalytic activity of the S site.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen-Doped MoS₂/Ti₃C₂T_X Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Liu

Dang

et al. 2021

Inorg. Chem.

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Molybdenum disulfide (MoS 2 ) is intrinsically inert for the hydrogen evolution reaction (HER) in alkaline media due to its electronic structures. Herein, we tune the electronic structures of MoS 2 by a combined strategy of post-N doping coupled with the synergistic effect of Ti 3 C 2 T X . The as-prepared N-doped MoS 2 / Ti 3 C 2 T X heterostructures show remarkable alkaline HER activity with an overpotential of 225 mV at 140 mA cm −2 , which ranks the N-doped MoS 2 /Ti 3 C 2 T X heterostructures among the best MoS 2 /MXene-based electrocatalysts reported for alkaline HER. The first-principles calculations indicate that the N doping can enhance the activation of nearby S sites of MoS 2 /Ti 3 C 2 T X and thus promote the HER process. This strategy provides a promising way to develop high-efficiency MoS 2 /MXene heterostructure catalysts for alkaline HER.

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Section: Resultsmentioning

confidence: 99%

Nitrogen-Doped MoS₂/Ti₃C₂T_X Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Liu

Dang

et al. 2021

Inorg. Chem.

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“…In recent years, multitudinous noble metal-free catalysts have been developed by scientists, such as sulfides, [1,5] nitrides, [6] phosphides, [2,7] carbides, [8] and so on. Among these, cobalt phosphides are recently regarded as one of the most promising HER catalysts due to the earth-abundant resources and high catalytic activity.…”

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confidence: 99%

“…Among these, cobalt phosphides are recently regarded as one of the most promising HER catalysts due to the earth-abundant resources and high catalytic activity. [9] In particular, the catalytic performance can be greatly enhanced by coupling with conductive materials (e.g., graphene, [8,10] MXene, [7,11] carbon nanotubes [5,12] ) due to the enhanced charge transfer kinetics and increased surface area with exposed active sites. [7,13] While, most synthetic cobalt phosphides catalysts are in the form of powders, which have lower surface area and less exposed active sites because of the self-agglomeration and bad morphological characteristics.…”

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confidence: 99%

Co‐Constructing Interfaces of Multiheterostructure on MXene (Ti₃C₂T_x)‐Modified 3D Self‐Supporting Electrode for Ultraefficient Electrocatalytic HER in Alkaline Media

Wang

et al. 2021

Adv Funct Materials

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Electrocatalysis is a potential method for sustainable hydrogen production, and the development of non-noble metal-based effective electrocatalysts for electrochemical water splitting is the core of exploiting and utilizing renewable energy. Herein, a stupendous electrocatalyst with multiheterostructure interfaces and 3D porous structure is synthesized, and the mechanisms of enhanced electrocatalytic activity combining multicharacterizations and density functional calculations are clarified. Especially, the fabricated Co 2 P/N@Ti 3 C 2 T x @NF (denoted as CPN@TC) exhibits an ultralow overpotential of 15 mV to arrive at a current density of 10 mA cm −2 with the long-term durability and a small Tafel slope of 30 mV dec −1 in 1 m KOH, which even compares with noble metal catalysts favorably. The outstanding HER activity is ascribed to multiheterointerfaces for adsorbing H 2 O and H*, fine conductivity for the electronic transmission, and well-designed structure for rapid transport of ions and gases. It is reasonable to think that the synthetic strategy of CPN@TC can be extended to the preparation of transition-metal-based phosphides for enhanced catalytic performance.

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“…Therefore, it is of great significance to exploit non‐noble metal‐based catalysts with good catalytic activity, low‐cost, and abundant element reserves. Currently, sulfides, 8,9 phosphides, 10,11 carbides, 7 and nitrides 12 are considered rational materials to replace noble metal‐based catalysts due to their good electrochemical performance and high storage capacity 13 . Among them, nanoscale MoS 2 electrocatalysts have received extensive attention due to their abundant ion transport channels and potential catalytic activity 14 .…”

Section: Introductionmentioning

confidence: 99%

P‐doped MoS₂/Ni₂P/Ti₃C₂T_x heterostructures for efficient hydrogen evolution reaction in alkaline media

Liu

Gao

et al. 2022

J Am Ceram Soc.

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By combining the advantages of doping to change the electronic structure of molybdenum disulfide (MoS 2 ), transition metal phosphides, and MXene, we proposed the idea of designing and preparing a new type of composite material, P-doped MoS 2 /Ni 2 P/Ti 3 C 2 T x heterostructures (denoted as P@MNTC), to serve as the hydrogen evolution reaction (HER) catalyst of electrochemical water splitting. The as-prepared P@MNTC heterostructures show a significant HER activity with an overpotential of 120 mV at 10 mA cm -2 in alkaline electrolyte, with decreasing 105 and 125 mV compared with those of MoS 2 and MXene, respectively. The density functional theory indicates that the P doping and synergy effect of Ti 3 C 2 T x can enhance the activation of MoS 2 and thus promote dissociation and absorption of H 2 O during HER process. This strategy provides a promising way to develop high-efficiency MoS 2 -and Ti 3 C 2 T x -based composite catalysts for alkaline HER.

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MoS2/Co9S8/MoC heterostructure connected by carbon nanotubes as electrocatalyst for efficient hydrogen evolution reaction

Cited by 36 publications

References 36 publications

Nitrogen-Doped MoS₂/Ti₃C₂T_X Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Nitrogen-Doped MoS₂/Ti₃C₂T_X Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Co‐Constructing Interfaces of Multiheterostructure on MXene (Ti₃C₂T_x)‐Modified 3D Self‐Supporting Electrode for Ultraefficient Electrocatalytic HER in Alkaline Media

P‐doped MoS₂/Ni₂P/Ti₃C₂T_x heterostructures for efficient hydrogen evolution reaction in alkaline media

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MoS2/Co9S8/MoC heterostructure connected by carbon nanotubes as electrocatalyst for efficient hydrogen evolution reaction

Cited by 36 publications

References 36 publications

Nitrogen-Doped MoS2/Ti3C2TX Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Nitrogen-Doped MoS2/Ti3C2TX Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Co‐Constructing Interfaces of Multiheterostructure on MXene (Ti3C2Tx)‐Modified 3D Self‐Supporting Electrode for Ultraefficient Electrocatalytic HER in Alkaline Media

P‐doped MoS2/Ni2P/Ti3C2Tx heterostructures for efficient hydrogen evolution reaction in alkaline media

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Nitrogen-Doped MoS₂/Ti₃C₂T_X Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Nitrogen-Doped MoS₂/Ti₃C₂T_X Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Co‐Constructing Interfaces of Multiheterostructure on MXene (Ti₃C₂T_x)‐Modified 3D Self‐Supporting Electrode for Ultraefficient Electrocatalytic HER in Alkaline Media

P‐doped MoS₂/Ni₂P/Ti₃C₂T_x heterostructures for efficient hydrogen evolution reaction in alkaline media