Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction

The noble, metal-free materials capable of efficiently catalyzing water splitting reactions currently hold a great deal of promise. In this study, we reported the structure and electrochemical performance of new MoS2-based material synthesized with L-cysteine. For this, a facile one-pot hydrothermal process was developed and an array of densely packed nanoplatelet-shaped hybrid species directly on a conductive substrate were obtained. The crucial role of L-cysteine was determined by numerous methods on the structure and composition of the synthesized material and its activity and stability for hydrogen evolution reaction (HER) from the acidic water. A low Tafel slope of 32.6 mV dec−1, close to a Pt cathode, was registered for the first time. The unique HER performance at the surface of this hybrid material in comparison with recently reported MoS2-based electrocatalysts was attributed to the formation of more defective 1T, 2H-MoS2/MoOx, C nanostructures with the dominant 1T-MoS2 phase and thermally degraded cysteine residues entrapped. Numerous stacks of metallic (1T-MoS2 and MoO2) and semiconducting (2H-MoS2 and MoO3) fragments relayed the formation of highly active layered nanosheets possessing a low hydrogen adsorption free energy and much greater durability, whereas intercalated cysteine fragments had a low Tafel slope of the HER reaction. X-ray photoelectron spectroscopy, scanning electron microscopy, thermography with mass spectrometry, high-resolution transmission electron microscopy, Raman spectroscopy techniques, and linear sweep voltammetry were applied to verify our findings.

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Amorphous Ni x Co y P-supported TiO2 nanotube arrays as an efficient hydrogen evolution reaction electrocatalyst in acidic solution

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.10.6 ◽

2019 ◽

Vol 10 ◽

pp. 62-70 ◽

Cited By ~ 5

Author(s):

Yong Li ◽

Peng Yang ◽

Bin Wang ◽

Zhongqing Liu

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Photoelectron Spectroscopy ◽

Electrochemical Impedance ◽

Nanotube Arrays ◽

Active Surface Area ◽

X Ray ◽

Transmission Electron

Bimetallic phosphides have been attracting increasing attention due to their synergistic effect for improving the hydrogen evolution reaction as compared to monometallic phosphides. In this work, NiCoP modified hybrid electrodes were fabricated by a one-step electrodeposition process with TiO2 nanotube arrays (TNAs) as a carrier. X-ray diffraction, transmission electron microscopy, UV–vis diffuse reflection spectroscopy, X-ray photoelectron spectroscopy and scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy were used to characterize the physiochemical properties of the samples. The electrochemical performance was investigated by cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy. We show that after incorporating Co into Ni–P, the resulting Ni x Co y P/TNAs present enhanced electrocatalytic activity due to the improved electron transfer and increased electrochemically active surface area (ECSA). In 0.5 mol L−1 H2SO4 electrolyte, the Ni x Co y P/TNAs (x = 3.84, y = 0.78) demonstrated an ECSA value of 52.1 mF cm−2, which is 3.8 times that of Ni–P/TNAs (13.7 mF cm−2). In a two-electrode system with a Pt sheet as the anode, the Ni x Co y P/TNAs presented a bath voltage of 1.92 V at 100 mA cm−2, which is an improvment of 79% over that of 1.07 V at 10 mA cm−2.

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Hydrothermal Synthesis of Few-Layer and Edge-Rich Cobalt-Doped Molybdenum Selenide/Nitrogenated Graphene Composite and Investigation of Its Electrocatalytic Activity for Hydrogen Evolution Reaction

NANO ◽

10.1142/s1793292016501071 ◽

2016 ◽

Vol 11 (10) ◽

pp. 1650107 ◽

Cited By ~ 3

Author(s):

Ming Ou ◽

Lin Ma ◽

Limei Xu ◽

Zhuomei Yang ◽

Haizhen Li

Keyword(s):

Electron Microscopy ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Photoelectron Spectroscopy ◽

Hydrothermal Route ◽

X Ray ◽

Graphene Composite ◽

Molybdenum Selenide ◽

Nitrogen Doped Graphene ◽

Doped Graphene

Cobalt-doped MoSe2/nitrogenated graphene composite has been successfully synthesized via a facile hydrothermal route and is investigated as an electrocatalyst for hydrogen evolution reaction (HER). The as-prepared samples are well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and Raman spectrum. The results reveal that Co-doped MoSe2 nanosheets which are characteristic of few layers (2–4 layers) and abundant exposed active edge sites are well anchored on the nitrogen-doped graphene sheets to constitute robust composites. When evaluated as catalysts for HER, the obtained composites demonstrate superior electrocatalytic activities toward HER.

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N-doped carbon-coated cobalt nanorod arrays supported on a titanium mesh as highly active electrocatalysts for the hydrogen evolution reaction

Journal of Materials Chemistry A ◽

10.1039/c4ta06284a ◽

2015 ◽

Vol 3 (5) ◽

pp. 1915-1919 ◽

Cited By ~ 79

Author(s):

Weijia Zhou ◽

Yucheng Zhou ◽

Linjing Yang ◽

Jilin Huang ◽

Yunting Ke ◽

...

Keyword(s):

Hydrogen Evolution ◽

Robust Stability ◽

Hydrogen Evolution Reaction ◽

Nanorod Arrays ◽

Titanium Mesh ◽

Tafel Slope ◽

Highly Active ◽

Carbon Coated ◽

Ti Mesh

N-doped carbon-coated cobalt nanorod arrays on a Ti mesh exhibited efficient HER performance with an overpotential of −56 mV, a Tafel slope of 78.2 mV dec−1 and robust stability.

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Facile one-pot supercritical synthesis of MoS2/pristine graphene nanohybrid as a highly active advanced electrocatalyst for hydrogen evolution reaction

Applied Surface Science ◽

10.1016/j.apsusc.2020.147282 ◽

2020 ◽

Vol 531 ◽

pp. 147282

Author(s):

Jian Zhao ◽

Deli Zhang ◽

Fuhai Guo ◽

Hongge Guo ◽

Yanlei Liu ◽

...

Keyword(s):

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Pristine Graphene ◽

One Pot ◽

Highly Active ◽

Supercritical Synthesis

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MoSe2-GO/rGO Composite Catalyst for Hydrogen Evolution Reaction

Polymers ◽

10.3390/polym10121309 ◽

2018 ◽

Vol 10 (12) ◽

pp. 1309 ◽

Cited By ~ 15

Author(s):

Wenwu Guo ◽

Quyet Le ◽

Amirhossein Hasani ◽

Tae Lee ◽

Ho Jang ◽

...

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Photoelectron Spectroscopy ◽

Transition Metal Dichalcogenides ◽

Catalytic Performance ◽

Composite Catalyst ◽

X Ray ◽

Molybdenum Selenide

There has been considerable research to engineer composites of transition metal dichalcogenides with other materials to improve their catalytic performance. In this work, we present a modified solution-processed method for the formation of molybdenum selenide (MoSe2) nanosheets and a facile method of structuring composites with graphene oxide (GO) or reduced graphene oxide (rGO) at different ratios to prevent aggregation of the MoSe2 nanosheets and hence improve their electrocatalytic hydrogen evolution reaction performance. The prepared GO, rGO, and MoSe2 nanosheets were characterized by X-ray powder diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. The electrocatalytic performance results showed that the pure MoSe2 nanosheets exhibited a somewhat high Tafel slope of 80 mV/dec, whereas the MoSe2-GO and MoSe2-rGO composites showed lower Tafel slopes of 57 and 67 mV/dec at ratios of 6:4 and 4:6, respectively. We attribute the improved catalytic effects to the better contact and faster carrier transfer between the edge of MoSe2 and the electrode due to the addition of GO or rGO.

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Fabrication and Characterization of Amorphous Cobalt-Doped Molybdenum Sulfide for Hydrogen Evolution Reaction

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2015.11441 ◽

2015 ◽

Vol 15 (10) ◽

pp. 8257-8262 ◽

Cited By ~ 4

Author(s):

Dongwook Lim ◽

Hyein Hwang ◽

Taewoo Kim ◽

Sang Eun Shim ◽

Sung-Hyeon Baeck

Keyword(s):

Electron Microscopy ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Photoelectron Spectroscopy ◽

Water Electrolysis ◽

Molybdenum Sulfide ◽

Intrinsic Activity ◽

Metal Catalyst ◽

Alkaline Water Electrolysis ◽

Catalytic Hydrogen Evolution

In the present study, hydrogen evolution reaction (HER) by alkaline water electrolysis was conducted without using a precious metal catalyst. We synthesized an amorphous cobalt-doped molybdenum sulfide by electrodeposition using different cobalt loadings. The amorphous Co-MoSx produced was characterized by scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The cobalt doping and sulfidation procedure resulted in the successful fabrication of a candidate catalyst for the catalytic hydrogen evolution in alkaline solution with high intrinsic activity. Cobalt incorporated amorphous MoSx exhibited 3 times higher HER activity than non-promoted MoSx.

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Highly active and durable self-standing WS2/graphene hybrid catalysts for the hydrogen evolution reaction

Journal of Materials Chemistry A ◽

10.1039/c6ta02876d ◽

2016 ◽

Vol 4 (24) ◽

pp. 9472-9476 ◽

Cited By ~ 52

Author(s):

Haiqing Zhou ◽

Fang Yu ◽

Jingying Sun ◽

Ran He ◽

Yumei Wang ◽

...

Keyword(s):

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Current Density ◽

Ni Foam ◽

Tafel Slope ◽

3D Graphene ◽

Hybrid Catalysts ◽

Highly Active ◽

Large Current ◽

Large Current Density

Efficient hydrogen evolution catalysts are fabricated by growing WS2 on 3D graphene/Ni foam, featured by large current density (10 mA cm−2 at −119 mV) and low Tafel slope (∼43 mV per dec), outperforming most previous WS2 catalysts.

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Facile Synthesis of CoSe2 Nanoparticles and their Electrocatalytic Performance for Hydrogen Evolution Reaction

Materials Science Forum ◽

10.4028/www.scientific.net/msf.852.916 ◽

2016 ◽

Vol 852 ◽

pp. 916-920 ◽

Cited By ~ 1

Author(s):

Hong Xue Qi ◽

Yuan Qiang Song ◽

Zhong Ping Liu ◽

Lan Xiang Ji ◽

Jian Guo Deng

Keyword(s):

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Energy Efficient ◽

Average Diameter ◽

Facile Synthesis ◽

One Pot ◽

Metal Free ◽

Highly Active ◽

Electrocatalytic Performance ◽

Free Hydrogen

For more energy-efficient and economical hydrogen production, highly active noble metal-free hydrogen evolution catalysts are a priority for all. Herein, we report a facile one-pot hydrothermal synthesis of CoSe2 nanoparticles with their electrocatalytic performance for hydrogen evolution reaction. The synthesized CoSe2 nanoparticles have an average diameter of 50-70 nm with a uniform distribution. They also exhibited good electrocatalytic performance for hydrogen evolution reaction with the onset overpotential and Tafel slope of 140 mV and 95 mV/dec, respectively. The results provide a facile and effective way for the exploration of efficient Co-based HER catalysts.

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Two-Dimensional WS2/g-C3N4 Layered Heterostructures With Enhanced Pseudocapacitive and Electrocatalytic Properties

Volume 8: Energy ◽

10.1115/imece2020-23137 ◽

2020 ◽

Author(s):

Oluwafunmilola Ola ◽

Yanqiu Zhu

Keyword(s):

Electron Microscopy ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Photoelectron Spectroscopy ◽

Carbon Nitride ◽

Graphitic Carbon ◽

Hybrid Nanocomposites ◽

Graphitic Carbon Nitride ◽

Electrochemical Performances ◽

X Ray

Abstract In this work, tungsten-based hybrid nanocomposites were grown on interconnected, macroscopic graphitic carbon nitride scaffold after solvothermal treatment followed by sulfidation to attain multifunctional composite electrocatalysts. The physicochemical properties of the obtained samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The tungsten-based composites were tested as electrodes for pseudocapacitors and as electrocatalysts for hydrogen evolution reaction, to take advantage of their porous graphitic carbon nitride features which would be beneficial for optimal ion transport to tungsten-based nanoparticles. These unique physicochemical features endow these composites with excellent electrochemical performances to reach a current density of 10 mA/cm2 for the hydrogen evolution reaction. In addition to demonstrating excellent specific capacitance, these hybrid nanocomposites also possess good stability after 8 hours of testing.

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