• Bulletin of the Korean Chemical Society
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• 제8권5호
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• pp.384-388
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• 1987

Modified Bloch equations were used to simulate the solution EPR spectra of mixed-valence heteropolyanions containing vanadium(IV) and vanadium(V). Simulated are the 15-, 22-, 36- and 43-line spectra of $\alpha$-1,2-$[PV(IV)VW_{10})O_{40}]^{6-},\;[P_2V(IV)V_2W_{15}O_{62}]^{10-},\;[HP_2V(IV)V_2W_{15}O_{62}]^{9-}$ and $\alpha$-1,2,3-$[HSiV(IV)V_2W_9O_{40}]^{7-}$, respectively. The transition probabilities for the intramolecular electron transfer were determined from the simulations.

• 한국표면공학회지
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• 제52권3호
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• pp.180-185
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• 2019

The demands to improve the performance of the vanadium redox flow battery have attracted an intense research on modifying the carbon-based electrode. In this study, the surface of graphite felt was reformed, using cobalt oxide. The cobalt oxide was implanted into graphite felt during hydrothermal and two step heat treatments. The cobalt was deposited by hydrothermal method and the two step heat treatments made lots of holes on the graphite felt surface which is called as porous surface. The porous surface acts as an electrochemically active site for the cathodic reaction of vanadium redox flow battery. The reformed electrode shows the electrochemically improved performance compared with the pristine electrode.

• Bulletin of the Korean Chemical Society
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• 제17권3호
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• pp.274-278
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• 1996

Vanadium oxide-zirconia catalysts were prepared by dry impregnation of powdered Zr(OH)4 with aqueous solution of NH4VO3. The characterization of prepared catalysts was performed using 51V solid state NMR, XRD, and DSC. The addition of vanadium oxide up to 9 mol% to zirconia shifted the phase transitions of ZrO2 from amorphous to tetragonal toward higher temperatures due to the interaction between vanadium oxide and zirconia. On the basis of results of XRD and DSC, it is concluded that the content of V2O5 monolayer covering most of the available zirconia was 9 mol%. The crystalline V2O5 was observed only with the samples containing V2O5 content exceeding the formation of complete monolayer (9 mol%) on the surface of ZrO2.

• 공업화학
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• 제33권3호
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• pp.315-321
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• 2022

We firstly observed that activated carbon (AC) deposited by atomic-layer vanadium pentoxide (V₂O₅) was used as CDI electrodes to utilize the high dielectric constant for enhancing the capacitance equipped with atomic layer deposition (ALD). It was demonstrated that the vanadium pentoxide (V₂O₅) with sub-nanometer layer was effectively deposited onto activated carbon, and the electric double-layer capacitance of the AC was improved due to an increase in the surface charge density originated from polarization, leading to high ion removal in CDI operation. It was confirmed that the performance of modified-AC increases more than 200%, comparable to that of pristine-AC under 1.5 V at 20 mL min^-1 in CDI measurements.

• 한국수소및신에너지학회논문집
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• 제33권6호
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• pp.803-807
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• 2022

In this study, the battery performance change according to the change of electrolyte flow rate. With increase of electrolyte flow rate the energy efficiency showed tendency of decrease. The electrochemical impedance spectroscopy results showed the increased resistance.

• 충청수학회지
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• 제27권2호
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• pp.309-317
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• 2014

In this paper, we give chemical hyperstructures of chemical reactions for a set of vanadium(V).

• 대한화학회지
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• 제44권1호
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• pp.1-3
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• 2000

• 한국재료학회:학술대회논문집
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• 한국재료학회 2001년도 추계 학술발표강연 및 논문개요집
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• pp.180-180
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• 2001

• Bulletin of the Korean Chemical Society
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• 제24권7호
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• pp.1014-1016
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• 2003

• Bulletin of the Korean Chemical Society
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• 제14권1호
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• pp.1-2
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• 1993