Heteronanowires of MoC–Mo<sub>2</sub>C as efficient electrocatalysts for hydrogen evolution reaction

Lin, Huanlei; Shi, Zhangping; He, Sina; Yu, Xiang; Wang, Sinong; Gao, Qingsheng; Tang, Yi

doi:10.1039/c6sc00077k

Cited by 550 publications

(355 citation statements)

References 49 publications

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“…We further found that there are plenty of dots in HAADF‐STEM image of the SL‐MoO x NS (Figure S6, Supporting Information), which means the SL‐MoO x NS is formed by these small clusters steadied by glycine. Therefore we suppose that the MoO x HNS should be formed undergoing four steps: at the beginning of the reaction, the ammonium heptamolybdate and glycine combine to form the organic‐inorganic hybrids in the acidic conditions; then the hybrids dissolve and the molybdenum‐oxygen clusters generate; after that, these clusters arrange together and the SL‐MoO x NS is formed; finally, the SL‐MoO x NS assemble to the MoO x HNS.…”

Section: Resultsmentioning

confidence: 99%

Oxygen‐Defected Molybdenum Oxides Hierarchical Nanostructure Constructed by Atomic‐Level Thickness Nanosheets as an Efficient Absorber for Solar Steam Generation

Yang

Feng

et al. 2018

Solar RRL

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Solar steam generation is a potential approach for fresh water recycling, thus attracting increasing attention recently. To further promote water evaporation rate, some new materials need to be developed, such as plasmonic transition metal oxides. In this work, we report an oxygen‐defected molybdenum oxides hierarchical nanostructure (MoOx HNS) composed of ultrathin nanosheets with atomic‐level thickness, which is demonstrated as an efficient absorber for solar steam generation. Benefiting from broadband light absorption and special assembled architecture, the resulting MoOx HNS loaded on a PTFE membrane (MoOx HNS Membrane) exhibits excellent performance for boosting steam generation rate. Under 1 sun (1 kW m−2) illumination, the evaporation rate can reach at 1.255 kg m−2 h−1, with the energy conversion efficiency of 85.6%, which is one of the best performance compared with other desalination materials. Meanwhile, the MoOx HNS Membrane can achieve high‐performance seawater desalination in both laboratorial and outdoor conditions. The enhanced water evaporation performance can be attributed to the synergistic effects of the efficient solar‐to‐thermal conversion and the unique channel structure. This work expands the scope of investigated materials which can be applied in seawater desalination system.

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Section: Resultsmentioning

confidence: 99%

Oxygen‐Defected Molybdenum Oxides Hierarchical Nanostructure Constructed by Atomic‐Level Thickness Nanosheets as an Efficient Absorber for Solar Steam Generation

Yang

Feng

et al. 2018

Solar RRL

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“…Figure 3b The X-ray photoelectron spectroscopy (XPS) was conducted to investigate the chemical composition and valence state of the transition metals in the samples. [57,58] The Ni/Mo 2 C(1:2)-NCNFs exhibits Mo 3d 5/2 and Mo 3d 3/2 peaks for Mo 2+ at 228.4 and 231.6 eV. The Mo 4+ and Mo 6+ species should originate from the inert MoO 2 and MoO 3 components, respectively, which can be ascribed to a partial surface oxidation of MoC x in air.…”

Section: Morphological and Structural Characterizationsmentioning

confidence: 99%

Ni Strongly Coupled with Mo₂C Encapsulated in Nitrogen‐Doped Carbon Nanofibers as Robust Bifunctional Catalyst for Overall Water Splitting

Zhu

Wang

et al. 2019

Advanced Energy Materials

349

181

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It is urgently required to develop highly efficient and stable bifunctional non‐noble metal electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for water splitting. In this study, a facile electrospinning followed by a post‐carbonization treatment to synthesize nitrogen‐doped carbon nanofibers (NCNFs) integrated with Ni and Mo2C nanoparticles (Ni/Mo2C‐NCNFs) as water splitting electrocatalysts is developed. Owing to the strong hydrogen binding energy on Mo2C and high electrical conductivity of Ni, synergetic effect between Ni and Mo2C nanoparticles significantly promote both HER and OER activities. The optimized hybrid (Ni/Mo2C(1:2)‐NCNFs) delivers low overpotentials of 143 mV for HER and 288 mV for OER at a current density of 10 mA cm−2. An alkaline electrolyzer with Ni/Mo2C(1:2)‐NCNFs as catalysts for both anode and cathode exhibits a current density of 10 mA cm−2 at a voltage of 1.64 V, which is only 0.07 V larger than the benchmark of Pt/C‐RuO2 electrodes. In addition, an outstanding long‐term durability during 100 h testing without obvious degradation is achieved, which is superior to most of the noble‐metal‐free electrocatalysts reported to date. This work provides a simple and effective approach for the preparation of low‐cost and high‐performance bifunctional electrocatalysts for efficient overall water splitting.

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“…Especially, Mo 2 C has been found to exhibit electrocatalytic performances for HER due to the high conductivity, similar d-band electronic density-of-state to that of Pt and optimal hydrogen-adsorption energy [24]. For instance, Lan et al reported Mo 2 C supported on reduced graphene oxide with low onset overpotential for HER [25].…”

Section: Introductionmentioning

confidence: 98%

Solvothermal access to rich nitrogen-doped molybdenum carbide nanowires as efficient electrocatalyst for hydrogen evolution reaction

Chi

Yan

Gao

et al. 2017

Journal of Alloys and Compounds

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Heteronanowires of MoC–Mo₂C as efficient electrocatalysts for hydrogen evolution reaction

Abstract: MoC–Mo2C heteronanowires accomplished via controlled carbonization are efficient in the hydrogen evolution reaction due to a synergistic enhancement.

Cited by 550 publications

References 49 publications

Oxygen‐Defected Molybdenum Oxides Hierarchical Nanostructure Constructed by Atomic‐Level Thickness Nanosheets as an Efficient Absorber for Solar Steam Generation

Oxygen‐Defected Molybdenum Oxides Hierarchical Nanostructure Constructed by Atomic‐Level Thickness Nanosheets as an Efficient Absorber for Solar Steam Generation

Ni Strongly Coupled with Mo₂C Encapsulated in Nitrogen‐Doped Carbon Nanofibers as Robust Bifunctional Catalyst for Overall Water Splitting

Solvothermal access to rich nitrogen-doped molybdenum carbide nanowires as efficient electrocatalyst for hydrogen evolution reaction

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Heteronanowires of MoC–Mo2C as efficient electrocatalysts for hydrogen evolution reaction

Abstract: MoC–Mo2C heteronanowires accomplished via controlled carbonization are efficient in the hydrogen evolution reaction due to a synergistic enhancement.

Cited by 550 publications

References 49 publications

Oxygen‐Defected Molybdenum Oxides Hierarchical Nanostructure Constructed by Atomic‐Level Thickness Nanosheets as an Efficient Absorber for Solar Steam Generation

Oxygen‐Defected Molybdenum Oxides Hierarchical Nanostructure Constructed by Atomic‐Level Thickness Nanosheets as an Efficient Absorber for Solar Steam Generation

Ni Strongly Coupled with Mo2C Encapsulated in Nitrogen‐Doped Carbon Nanofibers as Robust Bifunctional Catalyst for Overall Water Splitting

Solvothermal access to rich nitrogen-doped molybdenum carbide nanowires as efficient electrocatalyst for hydrogen evolution reaction

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Product

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Heteronanowires of MoC–Mo₂C as efficient electrocatalysts for hydrogen evolution reaction

Ni Strongly Coupled with Mo₂C Encapsulated in Nitrogen‐Doped Carbon Nanofibers as Robust Bifunctional Catalyst for Overall Water Splitting