Improved Porous Mixture of Molybdenum Nitride and Tantalum Oxide as a Charge Storage Material

Deng, Charles Z.; Pynenburg, R.; Tsai, K. C.

doi:10.1149/1.1838416

Cited by 30 publications

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“…The limitations of existing molybdenum nitride such as capacitive behavior, cycle performance, and rate capacity can be eliminated by hybridizing with other materials. Some examples for such materials are γ-Mo 2 N/Co 3 Mo 3 N, MoNx/TiN [228], and amorphous Ta 2 O 5 modified with γ-Mo 2 N [229].…”

Section: Mesoporous Cobalt Silicate Nanosheets (Co2mentioning

confidence: 99%

Electrode Materials for Supercapacitors in Hybrid Electric Vehicles: Challenges and Current Progress

et al. 2022

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For hybrid electric vehicles, supercapacitors are an attractive technology which, when used in conjunction with the batteries as a hybrid system, could solve the shortcomings of the battery. Supercapacitors would allow hybrid electric vehicles to achieve high efficiency and better power control. Supercapacitors possess very good power density. Besides this, their charge-discharge cycling stability and comparatively reasonable cost make them an incredible energy-storing device. The manufacturing strategy and the major parts like electrodes, current collector, binder, separator, and electrolyte define the performance of a supercapacitor. Among these, electrode materials play an important role when it comes to the performance of supercapacitors. They resolve the charge storage in the device and thus decide the capacitance. Porous carbon, conductive polymers, metal hydroxide, and metal oxides, which are some of the usual materials used for the electrodes in the supercapacitors, have some limits when it comes to energy density and stability. Major research in supercapacitors has focused on the design of stable, highly efficient electrodes with low cost. In this review, the most recent electrode materials used in supercapacitors are discussed. The challenges, current progress, and future development of supercapacitors are discussed as well. This study clearly shows that the performance of supercapacitors has increased considerably over the years and this has made them a promising alternative in the energy sector.

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Section: Mesoporous Cobalt Silicate Nanosheets (Co2mentioning

confidence: 99%

Electrode Materials for Supercapacitors in Hybrid Electric Vehicles: Challenges and Current Progress

et al. 2022

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“…[14][15][16] Amongt hem, molybdenum-based compounds [17][18][19][20][21][22][23][24][25] have been shown to demonstrate promising potentiali nt erms of replacing noble metals owing to their various chemical compositions, superior chemical stability, unique structures,and excellent platinum-likeproperties. [14][15][16] Amongt hem, molybdenum-based compounds [17][18][19][20][21][22][23][24][25] have been shown to demonstrate promising potentiali nt erms of replacing noble metals owing to their various chemical compositions, superior chemical stability, unique structures,and excellent platinum-likeproperties.…”

Section: Introductionmentioning

confidence: 99%

“…Recently,n on-preciousm etals based on Mo, W, Co, ands o on have been reported for photocatalytic hydrogen production. [14][15][16] Amongt hem, molybdenum-based compounds [17][18][19][20][21][22][23][24][25] have been shown to demonstrate promising potentiali nt erms of replacing noble metals owing to their various chemical compositions, superior chemical stability, unique structures,and excellent platinum-likeproperties.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum‐Based Co‐catalysts in Photocatalytic Hydrogen Production: Categories, Structures, and Roles

Wang

et al. 2018

ChemSusChem

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Photocatalytic hydrogen production by using solar energy has attracted great interest around the world. The main challenges are the high costs of the photocatalysts and the low efficiency of photocatalytic hydrogen production. Co-catalysts, as crucial components of photocatalysts, are usually used to stimulate photoexcited electron transfer from the light absorber to the surface, and they also catalyze the proton-reduction reaction to form H in water. However, most co-catalysts used in photocatalytic hydrogen production are noble metals, which are expensive and contradict the low-costs demanded by industry. Therefore, the development of earth-abundant and cheap co-catalysts to replace noble metals is necessary for photocatalytic H production. This account highlights the performance and roles of molybdenum-based non-noble metal co-catalysts in photocatalytic hydrogen production. We developed a series of inexpensive and efficient molybdenum-based co-catalysts. We demonstrated that more H could be produced by loading Mo-based co-catalysts on CdS by using the co-precipitation method than by using traditional Pt/CdS same under the same photocatalytic conditions. The molybdenum-based co-catalysts were able to form heterojunctions, which served as bridges to facilitate the transport and separation of photogenerated charges; moreover, the molybdenum-based co-catalysts were able to accept and store photoexcited electrons owing to their large specific capacitance. The stored photoelectrons could then be released according to proton-reduction processes to form H . Furthermore, the molybdenum-based co-catalysts were found to have metastable state structures and multiple valence states, which provided more active sites and effectively catalyzed the production of H and inhibited the reverse reaction. The discovery of Mo-based co-catalysts with superior properties will provide guidance for the design of new co-catalysts.

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“…[1][2][3][4][5][6][7][8] Since both ruthenium and iridium are expensive, less expensive electroconductive materials must be found for the development of electrochemical capacitors using the pseudocapacitive property of metal compounds. NiO 9,10 and the nitrides 11,12 of V, Nb, Mo, and W have also been proposed as electrode candidates for electrochemical capacitors. In the present investigation, the authors have found that Ti-V-W-O/Ti oxide electrodes show a fairly large pseudocapacitance both in H 2 SO 4 and KOH solutions.…”

mentioning

confidence: 99%

“…The role of the tungsten oxide for the enhancement of the voltammetric charge density is still unclear; however, the following reason is proposed. Tungsten species must help the formation of titanium dioxide nuclei, resulting in an increase in the interface between vanadium ions and titanium oxide crystallites, 12 as is the case in the tungsten oxide and rutile-type CrO 2 . In order to clarify the contribution of tungsten oxide itself to the voltammetric charge, an electrode was prepared by dip coating with a mixed solution of titanium and tungsten solutions.…”

mentioning

confidence: 99%

Ti-V-W-O/Ti Oxide Electrodes as Candidates for Electrochemical Capacitors

Takasu

Kumagai

Sawaguchi

et al. 1999

Electrochem. Solid-State Lett.

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Ti-V-W-O/Ti oxide electrodes prepared by a dip coating method provided a fairly large pseudocapacitance both in H 2 SO 4 and KOH solutions. The vanadium penetrates easily into the titanium oxide to form rutile Ti x V y O 2 aided by the tungsten species. These electrodes seem to have a potential for use as electrochemical capacitors. © 1999 The Electrochemical Society. S1099-0062(98)08-080-8. All rights reserved.Manuscript received August 20, 1998. Available electronically October 26, 1998 The RuO 2 -and IrO 2 -based oxide-coated titanium electrodes have been used for various electrolytic processes. They have also been examined as electrodes for electrochemical capacitors due to their large pseudocapacitance. [1][2][3][4][5][6][7][8] Since both ruthenium and iridium are expensive, less expensive electroconductive materials must be found for the development of electrochemical capacitors using the pseudocapacitive property of metal compounds. NiO 9,10 and the nitrides 11,12 of V, Nb, Mo, and W have also been proposed as electrode candidates for electrochemical capacitors. In the present investigation, the authors have found that Ti-V-W-O/Ti oxide electrodes show a fairly large pseudocapacitance both in H 2 SO 4 and KOH solutions.Experimental Oxide-coated electrodes in the present investigation were prepared by a dip coating method. For the dip coating procedure, 99.5% titanium rods etched in 10% oxalic acid solution at 80°C for 1 h were dipped into various solutions consisting of three different solutions of NH 4 VO 3 (50 mg [V] mL -1 ) and 5(NH 4 ) 2 O•12WO 3 •5H 2 O (50 mg [W] mL -1 ) in ethylene glycol + 10% nitric acid, and (C 4 H 9 O) 4 Ti (50 mg [Ti] mL -1 ) in ethylene glycol. The dipped titanium rods were dried at 60°C for 10 min and calcined at temperatures between 450 and 750°C in a preheated furnace for 10 min. The oxide loading estimated by the weight increase was about 0.05-0.07 mg cm -2 for one oxide coating cycle in this experiment.A beaker-type electrochemical cell equipped with a working electrode, a platinum plate counter electrode, and a Ag/AgCl reference electrode was used. The geometric surface area of the working electrode was 1 cm 2 . Cyclic voltammograms were recorded at 50 mV s -1 in 0.5 M (1 M = 1 mol dm -3 ) H 2 SO 4 or in 1 M KOH at 25°C. Electrode potentials were referred to the reversible hydrogen electrode (RHE) scale. A Luggin capillary faced the working electrode at a distance of 2 mm. A voltammetric charge density, corresponding to the electrochemically active surface area, was determined from integration of the enclosed area of the anodic curves between 0.30 and 1.10 V in the cyclic voltammogram. X-ray diffraction (XRD) analysis patterns of the samples were obtained using a Cu Kα radiation system (40 kV, 80 mA, Rigaku CN-2028). Elemental analyses were performed by X-ray emission spectroscopy (Philipps, EDAX-9100).Results and Discussion Figure 1 shows the steady-state cyclic voltammograms in 0.5 M H 2 SO 4 for the various compositions of the Ti-V-W-O/Ti oxide electrodes prepared by...

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Improved Porous Mixture of Molybdenum Nitride and Tantalum Oxide as a Charge Storage Material

Cited by 30 publications

References 0 publications

Electrode Materials for Supercapacitors in Hybrid Electric Vehicles: Challenges and Current Progress

Electrode Materials for Supercapacitors in Hybrid Electric Vehicles: Challenges and Current Progress

Molybdenum‐Based Co‐catalysts in Photocatalytic Hydrogen Production: Categories, Structures, and Roles

Ti-V-W-O/Ti Oxide Electrodes as Candidates for Electrochemical Capacitors

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