Adsorption phenomena in solutions of some anthraquinonesulfonic acids: Factors responsible for postwaves

1983 ◽  
Vol 48 (2) ◽  
pp. 550-559 ◽  
Author(s):  
Eugeniya Savenko ◽  
Gurami Tedoradze
Keyword(s):  
Reduction Process ◽  
Electrode Reaction ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Rotating Disc ◽  
Sulfonic Acids ◽  
Adsorption Phenomena

The comparison of the adsorption of anthraquinone-1,5-disulfonic, anthraquinone-1-sulfonic acids and respective reduced compounds shows that the appearance of polarographic adsorption waves is connected with partial (in the case of postwave) and complete (in the case of prewave) inhibition of the reduction process by the reduction products. The number of electrons involved in the reaction has been determined (n = 2 and 4 for di- and monoacid, respectively). Using rotating disc electrode the order of the electrode reaction equal to one has been found.

Study of the electrolytic reduction of Cr(VI) in aqueous solutions of chromic acid by the rotating disc electrode method

1978 ◽  
Vol 56 (15) ◽  
pp. 2042-2048 ◽  
Author(s):  
Hélio C. Chagas
Keyword(s):  
Chromic Acid ◽  
Reduction Process ◽  
Electrochemical Process ◽  
Chloride Ions ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Concentrated Solutions ◽  
Rotating Disc ◽  
Previous Suggestion ◽  
Electrode Method

The Cr6+/Cr3+ reduction in aqueous solution is studied in the presence of sulfate and chloride ions by the rotating disc electrode method. In the low chromic acid concentration region, the results exhibit some differences in relation to those obtained using more concentrated solutions. However, it is demonstrated that in the presence of sulfate and chloride ions there is a chemical reaction preceding the electrochemical process, confirming a previous suggestion. Results for Cr6+/Cr3+ reduction process in perchloric acid medium at various temperatures are presented and a reduction mechanism is suggested.

Bromate Reaction on a Rotating Disc Electrode: A New Method of Obtaining Approximate Analytical Solutions for Stationary Regime

2018 ◽  
Vol 483 (1) ◽  
pp. 256-260
Author(s):  
M. A. Vorotyntsev ◽  
A. E. Antipov ◽  
M. M. Petrov ◽  
R. D. Pichugov ◽  
E. I. Borisevich ◽  
...  
Keyword(s):  
Analytical Solutions ◽  
Stationary Regime ◽  
New Method ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Rotating Disc ◽  
Approximate Analytical Solutions

scholarly journals Redox Property Tuning in Bipyridinium Salts

2021 ◽  
Vol 8 ◽  
Author(s):  
Zuzana Burešová ◽  
Milan Klikar ◽  
Petr Mazúr ◽  
Michaela Mikešová ◽  
Jaroslav Kvíčala ◽  
...  
Keyword(s):  
Redox Processes ◽  
Rotating Disc Electrode ◽  
Structure Property ◽  
Disc Electrode ◽  
Rotating Disc ◽  
Half Cell ◽  
Redox Flow Batteries ◽  
Structure Property Relationships ◽  
Reversible Redox ◽  
Small Capacity

Bipyridinium salts are currently very popular due to their perspective applications in redox flow batteries. Hence, we designed and prepared a series of bipyridiniums based on 2,2′-, 3,3′-, and 4,4′-bipyridine and 2,2′-bipyrimidine. The straightforward synthesis utilizes commercially or readily available starting compounds and their direct N-alkylation, mostly using 1,3-propanesultone. All eleven target derivatives with systematically evolved structure were investigated by cyclic voltammetry, which allowed elucidating thorough structure-property relationships. The electrochemical behavior depends primarily on the parent scaffold, type of N-alkylation, number of quaternized nitrogen atoms, planarity, counter ion as well as the used media. Two derivatives featuring quasi-reversible redox processes were further tested on rotating disc electrode and in a flow battery half-cell. 4,4′-Bipyridinium derivative bearing two sultone residues showed better performance and stability in the flow half-cell with small capacity decays of 0.09/0.15% per reduction-oxidation cycle, based on the number of the utilized redox processes (one/two).

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