A comparative study of the electrochemical deposition of molybdenum oxides thin films on copper and platinum

Bănică, Radu; Barvinschi, Paul; Vaszilcsin, Nicolae; Nyari, Terezia

doi:10.1016/j.jallcom.2008.08.119

Cited by 13 publications

(7 citation statements)

References 17 publications

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“…As-deposited 300 compounded water, while the MoO x species stayed amorphous. This is consistent with the conclusion in literature 19,20 that dehydration of electrodeposited Mo oxides usually takes place at temperatures below 300 • C. At annealing temperatures equal to or above 350 • C, the film thickness decreases to 64 nm or less, due to crystallization and reduction. And after 3 h at 350 • C, the film contracted to only 55 nm, which is still continuous (see Fig.…”

Section: Samplesupporting

confidence: 93%

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Fabrication of MoO_xFilm as a Conductive Anode Material for Micro-Supercapacitors by Electrodeposition and Annealing

Liu

Xie

Wang

et al. 2014

J. Electrochem. Soc.

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An annealing process in reductive atmosphere of flowing H 2 /Ar improves the rate capability and cycling stability of electrodeposited MoO x film, which is favorable for its future application as micro-electrode for micro-supercapacitors. MoO 2 grains were found in the films annealed at temperatures above 350 • C, and the content of MoO 2 nanocrystallites was controlled by adjusting the annealing time. After annealing for 1.5 h at 350 • C, the 63 nm thick film exhibited the best electrochemical property, with a high volumetric capacitance of 594 F cm −3 at 20 mV s −1 , good rate capability with a relaxation time constant of 11 ms, and excellent cycling stability of 99% capacitance retention after 4000 cycles. This could be attributed to the combination of nanocrystalline MoO 2 , which is electronically conductive, and amorphous MoO x (x>2), which is pseudocapacitive in aqueous electrolyte.Miniaturized supercapacitors, or micro-supercapacitors (m-SCs), which possess the merits of conventional supercapacitors, i.e. fast power delivery and long cycle life, could play an important part in energy storage for micro-power systems such as self-powered sensors, microelectromechanical systems (MEMS), and portable electronics. 1-3 Much research has been recently devoted to exploring thin film electrode materials with superior. 4-8 According to the capacitive mechanism, there are two types of electrode materials, electrochemical double layer capacitor (EDLC) electrodes and pseudocapacitor electrodes which deliver charge through fast redox reactions. 9 As a representative of EDLC materials, carbon microelectrode, such as carbide-derived-carbon film, onion-like carbon microelectrode, and reduced grapheme oxide film, 1,6,7 could deliver charge at a fast rate; however, their specific capacitance is limited. Transition metal oxides are typical pseudocapacitive materials, which could potentially provide high specific capacitance thus high energy density. 2,8-10 However, the poor conductivity restrains their future application. The usual solution to overcome this disadvantage is to make composite microelectrode. For example, Si et al. prepared MnO x /Au multilayers by electron beam evaporation, which showed higher capacitance at a fast scan rate than the bare MnO x electrode does. 11 Shen et al. fabricated MnO 2 -based composite material following the synthesis methodology of conventional supercapacitors and injected it into the interdigital electrode channels. 10 However, compounding active materials and conductive additives requires either a more complicated fabrication process and higher cost, or produces unsatisfactory structural robustness and uniformity. To improve the conductivity by controlling the intrinsic composition of the pseudocapacitive materials could be another promising method. For example, nanocrystalline VN, with pseudocapacitive nano-layers of VO x on the electronically conducting VN grains, was found to be a superior electrode material. 12 MoO 3-x is pseudocapacitive in neutral or slightly acidic aqueous solut...

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Section: Samplesupporting

confidence: 93%

“…The formation of MoO 2 from the electrodeposited MoO x film after annealing in reductive atmosphere is in accordance with the results of similar experiments in literature. 20 Figure 2 shows the morphologies of the as-deposited and annealed MoO x films. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of MoO_xFilm as a Conductive Anode Material for Micro-Supercapacitors by Electrodeposition and Annealing

Liu

Xie

Wang

et al. 2014

J. Electrochem. Soc.

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“…Electrodeposition has popularly been employed for the cheap fabrication of thin films on a substrate, where major factors determining the nature of thin film include electrolyte, pH, deposition time and an applied potential [30]. For electrodeposition (under the dark condition) of Mo oxides on a substrate, some studies have been reported [31][32][33][34]. However, no studies have been reported for photoelectrochemical deposition of Mo oxides.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Hydrogen Evolution and CO2 Reduction over MoS2/Si and MoSe2/Si Nanostructures by Combined Photoelectrochemical Deposition and Rapid-Thermal Annealing Process

2019

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Diverse methods have been employed to synthesize MoS2 and MoSe2 catalyst systems. Herein, a combined photoelectrochemical (PEC) deposition and rapid-thermal annealing process has first been employed to fabricate MoS2 and MoSe2 thin films on Si substrates. The newly developed transition-metal dichalcogenides were characterized by scanning electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. PEC hydrogen evolution reaction (HER) was demonstrated in an acidic condition to show a PEC catalytic performance order of MoOx/Si < MoS2/Si << MoSe2/Si under the visible light-on condition. The HER activity (4.5 mA/cm2 at −1.0 V vs Ag/AgCl) of MoSe2/Si was increased by 4.8× compared with that under the dark condition. For CO2 reduction, the PEC activity was observed to be in the order of MoS2/Si < MoOx/Si << MoSe2/Si under the visible light-on condition. The reduction activity (0.127 mA/cm2) of MoSe2/Si was increased by 9.3× compared with that under the dark condition. The combined electrochemical deposition and rapid-thermal annealing method could be a very useful method for fabricating a thin film state catalytic system perusing hydrogen production and CO2 energy conversion.

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“…The first forward scan in cathodic direction shows two reduction waves at E = −0.38 V and −0.71 V vs. SCE. The first peak could be associated with the reduction of Mo(VI) to Mo(V) (−0.38 V) [20]. The peak observed at −0.71 V, which commences at potentials of around −0.6 V, is probably associated with the reduction to Mo(IV) and simultaneous formation of a film that deactivates the electrode and causes a current drop.…”

Section: Resultsmentioning

confidence: 99%

Electrocatalysis of oxygen reduction at electrodeposited molybdenum phosphate-based films

Luque

Fernández

2012

Journal of Power Sources

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A comparative study of the electrochemical deposition of molybdenum oxides thin films on copper and platinum

Cited by 13 publications

References 17 publications

Fabrication of MoO_xFilm as a Conductive Anode Material for Micro-Supercapacitors by Electrodeposition and Annealing

Fabrication of MoO_xFilm as a Conductive Anode Material for Micro-Supercapacitors by Electrodeposition and Annealing

Photoelectrochemical Hydrogen Evolution and CO2 Reduction over MoS2/Si and MoSe2/Si Nanostructures by Combined Photoelectrochemical Deposition and Rapid-Thermal Annealing Process

Electrocatalysis of oxygen reduction at electrodeposited molybdenum phosphate-based films

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A comparative study of the electrochemical deposition of molybdenum oxides thin films on copper and platinum

Cited by 13 publications

References 17 publications

Fabrication of MoOxFilm as a Conductive Anode Material for Micro-Supercapacitors by Electrodeposition and Annealing

Fabrication of MoOxFilm as a Conductive Anode Material for Micro-Supercapacitors by Electrodeposition and Annealing

Photoelectrochemical Hydrogen Evolution and CO2 Reduction over MoS2/Si and MoSe2/Si Nanostructures by Combined Photoelectrochemical Deposition and Rapid-Thermal Annealing Process

Electrocatalysis of oxygen reduction at electrodeposited molybdenum phosphate-based films

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Fabrication of MoO_xFilm as a Conductive Anode Material for Micro-Supercapacitors by Electrodeposition and Annealing

Fabrication of MoO_xFilm as a Conductive Anode Material for Micro-Supercapacitors by Electrodeposition and Annealing