Ultrathin MoS2 nanosheets growing within an in-situ-formed template as efficient electrocatalysts for hydrogen evolution

Liu, Ning; Yang, Lichun; Wang, Sinong; Zhong, Zhong; He, Sina; Yang, Xiaoyun; Gao, Qingsheng; Tang, Yi

doi:10.1016/j.jpowsour.2014.11.039

Cited by 115 publications

(62 citation statements)

References 31 publications

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“…The suitability of MoS2 as an excellent catalyst for HER, is mainly due to the catalytic activity at the edge of this lamellar crystal [7,12,13]. It has been proved by theoretical and experimental studies that the active sites of 2H-MoS2 for HER locate the (010) and (100) planes with the existence of unsaturated molybdenum and sulfur atoms, while the (002) basal plane is inactive [7,12,14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Polymer Addition on the Structure and Hydrogen Evolution Reaction Property of Nanoflower-Like Molybdenum Disulfide

Zeng

Niu

Song

et al. 2015

Metals

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Nano-structured molybdenum disulfide (MoS2) catalysts have been extensively developed for the hydrogen evolution reaction (HER). Herein, a novel hydrothermal intercalation approach is employed to fabricate nanoflower-like 2H-MoS2 with the incorporation of three polymers, polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), and polyethylenimine (PEI). The as-prepared MoS2 specimens were characterized by techniques of scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), together with Raman and Fourier transform infrared spectroscopy (FTIR). The HER properties of these lamellar nanoflower-like composites were evaluated using electrochemical tests of linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). The existent polymer enlarges the interlayer spacing of the lamellar MoS2, and reduces its stacked thickness. The lamellar MoS2 samples exhibit a promoting activity in HER at low additions of these three polymers (0.04 g/g MoS2 for PVA and PEI, and 0.08 g/g MoS2 for PVP). This can be attributed to the fact that the expanded interlayer of MoS2 can offer abundant exposed active sites for HER. Conversely, high additions of the polymers exert an obvious interference in the HER activity of the lamellar MoS2. Compared with the samples of MoS2/PVP-0.08 and MoS2/PEI-0.04, the MoS2/PVA-0.04 composite exhibits excellent activity in HER, in terms of higher current density and lower onset potential. OPEN ACCESSMetals 2015, 5 1830

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Section: Introductionmentioning

confidence: 99%

Effect of Polymer Addition on the Structure and Hydrogen Evolution Reaction Property of Nanoflower-Like Molybdenum Disulfide

Zeng

Niu

Song

et al. 2015

Metals

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“…The value of j 0 for the Ni-MP/MoS 2 sample is larger than those of other two composite samples, so the charming HER behavior of Ni-MP/MoS 2 sample is further validated [37]. where, ne is the number of transferred electrons, and parameters of R, T, and F are already defined by Equation (2). As ascertained by the data (Table 2), without any doubt, the Pt/C sample shows the best HER performance followed by the Ni-P/MoS2 composites and last by MoS2 sample.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 89%

“…Moreover, the symmetry factor (β) reflecting the HER activity can be calculated by the Tafel slope via Equation (2) bF n RT β e 303 . 2 = (2) where, parameters of R, T, ne, and F are corresponding to the gas constant (8.314 J/(K·mol)), absolute temperature, number of exchanged electrons, and the Faraday constant (96,485 C/mol), respectively. The values of b and β derived from the analysis of Figure 5 are also summarized in Table 1.…”

Section: Tafel Polarizationmentioning

confidence: 99%

“…In addition, another parameter of exchange current density (j 0 ) can also be calculated using Equation (5) j 0 = RT n e FR ct (5) where, n e is the number of transferred electrons, and parameters of R, T, and F are already defined by Equation (2). As ascertained by the data (Table 2), without any doubt, the Pt/C sample shows the best HER performance followed by the Ni-P/MoS 2 composites and last by MoS 2 sample.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…In general, the electrocatalytic hydrogen evolution reaction (HER) process is extensively employed for the generation of hydrogen. The well-known platinum (Pt) and Pt-based alloys possess a superior electrocatalytic HER property [2,3], but the limited availability and high price retard their large-scale applications. In view of this situation, the exploitation of cost-effective and earth-abundant alternatives of Pt-based catalysts is very crucial to push the engineering practice of HER.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Evolution Reaction Property in Alkaline Solution of Molybdenum Disulfide Modified by Surface Anchor of Nickel–Phosphorus Coating

Jun

Song

Yan

et al. 2017

Metals

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Molybdenum disulfide (MoS 2 ) is unfavorable for practical application in the hydrogen evolution reaction (HER) process due to its inert basal surface, inferior conductivity, and limited amount of active edge sites. For the purpose of enhancing the HER performance of this catalyst, the HER activity of its basal surface should be increased. Herein, three types of nickel-phosphorus (Ni-P) coatings-namely, low phosphorus (LP), medium phosphorus (MP) and high phosphorus (HP) -were anchored onto the surfaces of MoS 2 nanoparticles via an electroless plating process; thus, three Ni-P/MoS 2 composites (Ni-LP/MoS 2 , Ni-MP/MoS 2 , and Ni-HP/MoS 2 ) were fabricated. Crystal structures, morphologies, chemical components, and HER performances of each in an alkaline solution were characterized. Both Ni-LP/MoS 2 and Ni-MP/MoS 2 showed a crystal nature, while the amorphous feature for Ni-HP/MoS 2 was validated. The three Ni-P/MoS 2 composites exhibited a higher HER activity than the pure MoS 2 . The HER performance of the Ni-MP/MoS 2 composite was more outstanding than those of other two composites, which could be attributed to the presence of metastable nickel phosphides, and the excellent conductivity of Ni-MP coating anchored on the basal surface of MoS 2 .

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Cobalt‐Doping in Molybdenum‐Carbide Nanowires Toward Efficient Electrocatalytic Hydrogen Evolution

Lin

Liu

Shi

et al. 2016

Adv Funct Materials

422

287

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Efficient hydrogen evolution reaction (HER) over noble‐metal‐free electrocatalysts provides one of the most promising pathways to face the energy crisis. Herein, facile cobalt‐doping based on Co‐modified MoOx–amine precursors is developed to optimize the electrochemical HER over Mo2C nanowires. The effective Co‐doping into Mo2C crystal structure increases the electron density around Fermi level, resulting in the reduced strength of Mo–H for facilitated HER kinetics. As expected, the Co‐Mo2C nanowires with an optimal Co/Mo ratio of 0.020 display a low overpotential (η10 = 140 and 118 mV for reaching a current density of –10 mA cm−2; η100 = 200 and 195 mV for reaching a current density of –100 mA cm−2), a small Tafel slope (39 and 44 mV dec−1), and a low onset overpotential (40 and 25 mV) in 0.5 m H2SO4 and 1.0 m KOH, respectively. This work highlights a feasible strategy to explore efficient electrocatalysts via engineering on composition and nanostructure.

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Ultrathin MoS2 nanosheets growing within an in-situ-formed template as efficient electrocatalysts for hydrogen evolution

Cited by 115 publications

References 31 publications

Effect of Polymer Addition on the Structure and Hydrogen Evolution Reaction Property of Nanoflower-Like Molybdenum Disulfide

Effect of Polymer Addition on the Structure and Hydrogen Evolution Reaction Property of Nanoflower-Like Molybdenum Disulfide

Hydrogen Evolution Reaction Property in Alkaline Solution of Molybdenum Disulfide Modified by Surface Anchor of Nickel–Phosphorus Coating

Cobalt‐Doping in Molybdenum‐Carbide Nanowires Toward Efficient Electrocatalytic Hydrogen Evolution

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