Studies on cerium (Ce4+/Ce3+)–vanadium(V2+/V3+) redox flow cell—cyclic voltammogram response of Ce4+/Ce3+ redox couple in H2SO4 solution

2004 ◽  
Vol 130 (1-2) ◽  
pp. 299-305 ◽  
Author(s):  
Y Liu ◽  
X Xia ◽  
H Liu
Keyword(s):  
Flow Cell ◽  
Redox Couple ◽  
Cyclic Voltammogram ◽  
H2so4 Solution ◽  
Redox Flow Cell

E-blood: High power aqueous redox flow cell for concurrent powering and cooling of electronic devices

Nano Energy ◽  
2021 ◽  
pp. 106864
Author(s):  
Xun Wang ◽  
Mengqi Gao ◽  
Yann Mei Lee ◽  
Manohar Salla ◽  
Feifei Zhang ◽  
...  
Keyword(s):  
High Power ◽  
Electronic Devices ◽  
Flow Cell ◽  
Redox Flow Cell

Some thermodynamic and kinetic properties of H2SO4–H3PO4–H2O–Fe(III) system

2021 ◽  
pp. 1-9
Author(s):  
Ya.G. Avdeev ◽  
Keyword(s):  
Diffusion Coefficients ◽  
Arrhenius Equation ◽  
Platinum Electrode ◽  
Molar Fraction ◽  
Redox Couple ◽  
Kinetic Properties ◽  
Cyclic Voltammogram ◽  
Electrode Potentials ◽  
Half Wave ◽  
Sulfate Complexes

The values of the electrode potentials of the redox couple Fe(III) / Fe(II) and the half-wave potentials of the reactions Fe3+ + e– = Fe2+ и Fe2+ — e– = Fe3+ on the cyclic voltammogram of a platinum electrode in acid solutions containing Fe(III) salts have been measured to characterize the oxidizing ability of the H2SO4—H3PO4—H2O—Fe(III) system. The values of these experimentally obtained parameters are close. A decrease in the oxidizing ability of H2SO4 and H3PO4 mixtures containing Fe(III) with an increase in the molar fraction of H3PO4 in them occurs due to the formation of Fe(III) complexes with phosphate anions which are inferior to their hydrate and sulfate complexes in the oxidizing ability. The temperature coefficients of the electrode potential (dE / dt) of the redox couple Fe(III) / Fe(II) in the H2SO4—H2O, H2SO4—H3PO4—H2O and H3PO4–H2O systems were determined experimentally. The diffusion coefficients of Fe(III) in the studied solutions were calculated based on the Randles—Shevchik equation. The temperature dependence of the diffusion coefficients of Fe(III) cations is satisfactorily described by the Arrhenius equation. The parameters of this equation are calculated.

scholarly journals Microbially-charged electrochemical fuel for energy storage in a redox flow cell

2020 ◽  
Vol 445 ◽  
pp. 227307 ◽  
Author(s):  
Márcia S.S. Santos ◽  
Luciana Peixoto ◽  
João Azevedo ◽  
Ricardo A.R. Monteiro ◽  
Celia Dias-Ferreira ◽  
...  
Keyword(s):  
Energy Storage ◽  
Flow Cell ◽  
Redox Flow Cell

An Integrated Sonication Technique for Electrodeposition of Platinum and Ruthenium on Carbon Nanotubes for Methanol Oxidation

2012 ◽  
Vol 9 (4) ◽  
Author(s):  
Tsung-Kuang Yeh ◽  
Yu-Ming Chang ◽  
Chuen-Horng Tsai ◽  
Ming-Chi Tsai ◽  
Mei-Ya Wang
Keyword(s):  
Carbon Nanotubes ◽  
Sulfuric Acid ◽  
Methanol Oxidation ◽  
Cyclic Voltammogram ◽  
Electrochemical Characteristics ◽  
H2so4 Solution ◽  
Peak Current Density ◽  
Surface Distribution ◽  
Ru Nanoparticles ◽  
Sonication Technique

An electrodeposition technique that could significantly improve the deposition of platinum-ruthenium (Pt-Ru) nanoparticles onto carbon nanotubes (CNTs) directly grown on carbon cloths was adopted in this study. Integrated sonication (IS) was activated during the electrodeposition process conducted in a sulfuric acid (H2SO4) solution containing Pt and Ru precursor chemicals of hexachloroplatinic acid and ruthenium trichloride, respectively, and ethylene glycol (EG) as a dispersing agent. In comparison with our earlier work, this new technique would further reduce the size of Pt-Ru particles from 4-6 nm to 2-3 nm and lead to a more even and higher surface distribution of these nanoparticles on the CNTs. In addition, the loadings of Pt and Ru on the CNTs were both markedly increased. Electrochemical characteristics of methanol oxidation on specimens bearing these catalysts (Pt-Ru/CNTs) were investigated via cyclic voltammetry analysis in mixed 1 M methanol and 0.5 M sulfuric acid solutions. It was found that the peak current density of methanol oxidation obtained from the cyclic voltammogram on the new Pt-Ru/CNTs specimen was nearly three times of that on the specimen prepared with EG in the absence of IS. The outcome signified better catalyst morphology and distribution and a significantly improved methanol oxidation efficiency of the new specimen prepared in the mixed EG and H2SO4 solution by electrodeposition in the presence of IS.

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