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

Carbon Nitride ◽

Graphitic Carbon ◽

Hybrid Nanocomposites ◽

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.

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 ◽

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.

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 ◽

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.

Interface Engineering of MoS 2 ‐Modified Graphitic Carbon Nitride Nano‐photocatalysts for an Efficient Hydrogen Evolution Reaction

ChemPlusChem ◽

10.1002/cplu.202000096 ◽

2020 ◽

Vol 85 (7) ◽

pp. 1379-1388

Author(s):

Eirini D. Koutsouroubi ◽

Ioannis Vamvasakis ◽

Ioannis T. Papadas ◽

Charalampos Drivas ◽

Stelios A. Choulis ◽

...

Keyword(s):

Hydrogen Evolution ◽

Carbon Nitride ◽

Graphitic Carbon ◽

Interface Engineering

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 ◽

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.

Noble-metal-free p-n heterojunction of iron(III) hydroxide and graphitic carbon nitride for hydrogen evolution reaction

Ceramics International ◽

10.1016/j.ceramint.2021.09.047 ◽

2021 ◽

Author(s):

Hongmei Chen ◽

Yanyun Fan ◽

Zheng Fan ◽

Hongyan Xu ◽

Danfeng Cui ◽

...

Keyword(s):

Hydrogen Evolution ◽

Noble Metal ◽

Carbon Nitride ◽

Graphitic Carbon ◽

Metal Free

Metal free triad from red phosphorous, reduced graphene oxide and graphitic carbon nitride (red P-rGO-g-C3N4) as robust electro-catalysts for hydrogen evolution reaction

Electrochimica Acta ◽

10.1016/j.electacta.2020.135851 ◽

2020 ◽

Vol 338 ◽

pp. 135851 ◽

Cited By ~ 1

Author(s):

Aniruddha Jaiswal ◽

Shweta Pal ◽

Ashish Kumar ◽

Rajiv Prakash

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Hydrogen Evolution ◽

Carbon Nitride ◽

Graphitic Carbon ◽

Metal Free ◽

Reduced Graphene

Cuprous oxide (Cu2O)/graphitic carbon nitride (g-C3N4) nanocomposites for electrocatalytic hydrogen evolution reaction

Diamond and Related Materials ◽

10.1016/j.diamond.2020.107899 ◽

2020 ◽

Vol 107 ◽

pp. 107899 ◽

Cited By ~ 4

Author(s):

Aleena Mary Paul ◽

Aparna Sajeev ◽

Ravi Nivetha ◽

Kannan Gothandapani ◽

Preetam Bhardwaj ◽

...

Keyword(s):

Hydrogen Evolution ◽

Cuprous Oxide ◽

Carbon Nitride ◽

Graphitic Carbon ◽

Graphitic Carbon Nitride

Mesoporous graphitic carbon nitride-supported binary MPt (M: Co, Ni, Cu) nanoalloys as electrocatalysts for borohydride oxidation and hydrogen evolution reaction

Catalysis Today ◽

10.1016/j.cattod.2019.09.006 ◽

2020 ◽

Vol 357 ◽

pp. 291-301 ◽

Cited By ~ 6

Author(s):

Raisa C.P. Oliveira ◽

Melike Sevim ◽

Biljana Šljukić ◽

César A.C. Sequeira ◽

Önder Metin ◽

...

Keyword(s):

Hydrogen Evolution ◽

Carbon Nitride ◽

Graphitic Carbon ◽

Borohydride Oxidation

Influence of High Temperature Synthesis on the Structure of Graphitic Carbon Nitride and Its Hydrogen Generation Ability

Materials ◽

10.3390/ma13122756 ◽

2020 ◽

Vol 13 (12) ◽

pp. 2756 ◽

Cited By ~ 1

Author(s):

Emilia Alwin ◽

Kamila Kočí ◽

Robert Wojcieszak ◽

Michał Zieliński ◽

Miroslava Edelmannová ◽

...

Keyword(s):

Carbon Nitride ◽

Hydrogen Generation ◽

Thermal Polymerization ◽

Graphitic Carbon ◽

Photocatalytic Decomposition ◽

Heating Rates ◽

X Ray ◽

Synthesis Conditions

Graphitic carbon nitride (g-C3N4) was obtained by thermal polymerization of dicyandiamide, thiourea or melamine at high temperatures (550 and 600 °C), using different heating rates (2 or 10 °C min−1) and synthesis times (0 or 4 h). The effects of the synthesis conditions and type of the precursor on the efficiency of g-C3N4 were studied. The most efficient was the synthesis from dicyandiamide, 53%, while the efficiency in the process of synthesis from melamine and thiourea were much smaller, 26% and 11%, respectively. On the basis of the results provided by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–vis), thermogravimetric analysis (TGA), elemental analysis (EA), the best precursor and the optimum conditions of synthesis of g-C3N4 were identified to get the product of the most stable structure, the highest degree of ordering and condensation of structure and finally the highest photocatalytic activity. It was found that as the proton concentration decreased and the degree of condensation increased, the hydrogen yields during the photocatalytic decomposition of water–methanol solution were significantly enhanced. The generation of hydrogen was 1200 µmol g−1 and the selectivity towards hydrogen of more than 98%.