Amorphous molybdenum sulfide on graphene–carbon nanotube hybrids as supercapacitor electrode materials

Pham, Kien-Cuong; McPhail, David S.; Wee, Andrew Thye Shen; Chua, Daniel H. C.

doi:10.1039/c6ra27901e

Cited by 44 publications

(28 citation statements)

References 62 publications

(63 reference statements)

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“…The other doublet indicates the presence of Mo (+VI) oxidation state of MoO 3 or MoO 4 2− , which arises due to the surface oxidation of MoS 2 sample in air. Whereas, sulfur 2p core level spectra show four peaks having binding energy of 162, 163.16, 163.9 and 165.07 eV ,,. Two peaks with binding energy of 162 and 163.16 eV could be assigned to the 2p 3/2 and 2p 1/2 lines of MoS 2 .…”

Section: Resultsmentioning

confidence: 87%

“…Survey spectra confirm the presence of carbon, oxygen, molybdenum and sulfur wherein, the molybdenum and sulfur ratio was found to be nearly 2 and 3.5 for annealed and as prepared samples, respectively (Figure S17, SI). High resolution Mo 3d core level spectra of annealed HPOM only sample exhibits five peaks, in which 226.45 eV peak corresponds to the S 2 s peak of MoS 2 (Figure ) ,,. Additionally, two sets of doublet were observed in which 229.11 (3d 5/2 ) and 232.24 eV (3d 3/2 ) peaks are for oxidation states of Mo (+IV) of MoS 2 .…”

Section: Resultsmentioning

confidence: 99%

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Facile Synthesis of MoS_x and MoS_x‐rGO Composite: Excellent Electrocatalyst for Hydrogen Evolution Reaction

et al. 2017

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In this work, one pot synthetic methodology was developed, wherein simple purging of H2S gas into a solution/dispersion of polyoxometalates in the absence as well as presence of reduced graphene oxide (rGO) at room temperature resulted in the formation of MoSx and MoSx‐rGO composites. Powder XRD, TEM, EDS elemental analysis, TGA, and XPS study reveal that as prepared samples mainly consist of nanocrystalline MoS3 particles whereas annealed samples mainly contain few layers of MoS2 nanosheets. Annealed samples exhibit better electrocatalytic activity towards hydrogen evolution reaction (HER) as compared to the as‐prepared samples. Among all the annealed samples, MoS2‐rGO nanocomposite exhibits superior catalytic activity for HER with lower onset overpotential and higher current density, as compared to other conventional MoS2. The Tafel slope of 41.7 mV/decade for MoS2‐rGO nanocomposite signifies that MoS2 catalyzed HER follows the Volmer‐Heyrovsky mechanism wherein, electrochemical desorption of hydrogen is the rate‐limiting step. Moreover, the integration of few layers of MoS2 and rGO enable remarkable long‐term electrochemical stability and showing negligible change in the current density even after 3000 cycles.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of MoS_x and MoS_x‐rGO Composite: Excellent Electrocatalyst for Hydrogen Evolution Reaction

et al. 2017

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“…In that case, these sites can be converted into Mo VI =O or Mo VI (=O) 2 defects by reaction with O 2 or just H 2 O. We also note that when the resulting MoS x ‐AE film becomes thicker, it might also act as a capacitor . As a result, the apparent number of electrons over the oxidation of a [Mo 3 S 13 ] 2− cluster becomes higher than two.…”

Section: Figurementioning

confidence: 88%

“…We also note that when the resulting MoS x -AE film becomes thicker,i tm ight also act as ac apacitor. [13] As ar esult,t he apparent number of electrons over the oxidation of a[ Mo 3 S 13 ] 2À cluster becomes higher than two. This explainst he derivation of the slopev alue when the Au elec-trode is hold at 0.3 Vf or al ongp eriod or at 0.6 V, at which the deposition rate is accelerated.…”

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confidence: 99%

Insights into the Electrochemical Polymerization of [Mo₃S₁₃]²⁻ Generating Amorphous Molybdenum Sulfide

Duong

Nguyen

et al. 2019

Chemistry A European J

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Amorphous molybdenum sulfide is an attractive electrode material for Li/Mg batteries and an efficient Pt‐free catalyst for the hydrogen evolution reaction in water. By using the electrochemical quartz crystal microbalance (EQCM) analysis, new insights were gained into the electrochemical polymerization of the [Mo3S13]2− cluster, which generates amorphous molybdenum sulfide thin films. In this work, it is shown that, at the anodic potential, a two‐electron oxidative elimination of the terminal disulfide ligand within the [Mo3S13]2− cluster induces the polymerization. A reductive elimination of the terminal disulfide ligand also occurs at the cathodic potential, inducing the polymerization. However, in sharp contrast to the anodic polymerization, according to which the film growth is rapid, the cathodic polymerization competes with the electrochemical reductive corrosion of the readily grown film, therefore occurring at a significant lower growth rate.

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“…In this way, the high specific capacitance is attributed to large amount of charge storage through both faradaic and non–faradaic processes at the electrode/electrolyte interface. Among various metal oxides, transition metal oxides and conducting polymeric materials mixed with GO have been rigorously studied in the past …”

Section: Introductionmentioning

confidence: 99%

Estimation of electrochemical charge storage capability of ZnO/CuO/reduced graphene oxide nanocomposites

2019

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Summary Nanocomposites of ZnO/CuO with rGO were synthesized using sonochemical and thermal treatment methods. The formation of ZnO and CuO phases on the rGO sheets and both ZnO/CuO in the ternary component nanocomposites were confirmed from IR spectroscopy and X‐ray photoelectron spectroscopy. The microstructure of the nanocomposites as revealed by TEM and FE‐SEM suggested that CuO was decorated as nano‐rods, whereas ZnO particles retained the spherical shape. In case of ternary nanocomposite, both nano‐rods and spherical particles were agglomerated on the rGO sheets. The pseudocapacitive behavior of ZnO‐rGO nanocomposite corresponded to relatively higher specific capacitance (344.6 F/g) compared with other nanocomposites. The galvanostatic cyclic charge/discharge (GCD) tests also confirmed that ZnO‐rGO nanocomposite could provide the highest specific energy (21.7 Wh/kg) and power density (129.8 kW/kg) at 0.4 A/g compared with CuO‐rGO and ZnO/CuO‐rGO.

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Amorphous molybdenum sulfide on graphene–carbon nanotube hybrids as supercapacitor electrode materials

Abstract: Deposition of amorphous molybdenum sulfide on a high specific surface area carbon support strongly enhanced the specific capacitance of the material.

Cited by 44 publications

References 62 publications

Facile Synthesis of MoS_x and MoS_x‐rGO Composite: Excellent Electrocatalyst for Hydrogen Evolution Reaction

Facile Synthesis of MoS_x and MoS_x‐rGO Composite: Excellent Electrocatalyst for Hydrogen Evolution Reaction

Insights into the Electrochemical Polymerization of [Mo₃S₁₃]²⁻ Generating Amorphous Molybdenum Sulfide

Estimation of electrochemical charge storage capability of ZnO/CuO/reduced graphene oxide nanocomposites

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Amorphous molybdenum sulfide on graphene–carbon nanotube hybrids as supercapacitor electrode materials

Abstract: Deposition of amorphous molybdenum sulfide on a high specific surface area carbon support strongly enhanced the specific capacitance of the material.

Cited by 44 publications

References 62 publications

Facile Synthesis of MoSx and MoSx‐rGO Composite: Excellent Electrocatalyst for Hydrogen Evolution Reaction

Facile Synthesis of MoSx and MoSx‐rGO Composite: Excellent Electrocatalyst for Hydrogen Evolution Reaction

Insights into the Electrochemical Polymerization of [Mo3S13]2− Generating Amorphous Molybdenum Sulfide

Estimation of electrochemical charge storage capability of ZnO/CuO/reduced graphene oxide nanocomposites

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Resources

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Facile Synthesis of MoS_x and MoS_x‐rGO Composite: Excellent Electrocatalyst for Hydrogen Evolution Reaction

Facile Synthesis of MoS_x and MoS_x‐rGO Composite: Excellent Electrocatalyst for Hydrogen Evolution Reaction

Insights into the Electrochemical Polymerization of [Mo₃S₁₃]²⁻ Generating Amorphous Molybdenum Sulfide