scholarly journals Unexpected electrochemical behavior of an anolyte redoxmer in flow battery electrolytes: solvating cations help to fight against the thermodynamic–kinetic dilemma

2020 ◽  
Vol 8 (27) ◽  
pp. 13470-13479 ◽  
Author(s):  
Yuyue Zhao ◽  
Zhou Yu ◽  
Lily A. Robertson ◽  
Jingjing Zhang ◽  
Zhangxing Shi ◽  
...  
Keyword(s):  
Redox Potential ◽  
Electrochemical Behavior ◽  
Radical Anion ◽  
Flow Battery ◽  
Charged Radical

Solvating cations help to lift the thermodynamic-kinetic constrain of an anolyte redoxmer by achieving a synergetic improvement of two conflicting properties: a lower redox potential AND a higher stability of the charged radical anion.

Nitroso-R-Salt in Aqueous Solutions for Redox Flow Battery Application

2011 ◽  
Vol 239-242 ◽  
pp. 2813-2816 ◽  
Author(s):  
Zhi Peng Xie ◽  
Feng Jiao Xiong ◽  
De Bi Zhou
Keyword(s):  
Aqueous Solutions ◽  
Alkaline Solution ◽  
Electrochemical Behavior ◽  
Electrode Reaction ◽  
Active Species ◽  
Electrode Kinetics ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Diffusion Controlled ◽  
Battery Application

The electrochemical behavior of Nitroso-R-salt (NRS) in aqueous solutions and the influence of pH are investigated. In alkaline solution, the electrode reaction of NRS exhibits stagnant electrode kinetics. With rising acid concentration, it exhibits more and more fast electrode kinetics and a diffusion-controlled process. Thus, acidic aqueous solutions are favorable for the NRS as active species of a redox flow battery (RFB). Average coulombic and energy efficiencies of the NRS/Zn RFB are 93.2 and 80.6%, respectively, showing that self-discharge is small. The preliminary exploration shows that the NRS is electrochemically promising for RFB application.

Electrochemical Behavior of Polyaniline Microparticle Suspension as Flowing Anode for Rechargeable Lead Dioxide Flow Battery

2013 ◽  
Vol 161 (3) ◽  
pp. A330-A335 ◽  
Author(s):  
Yongfu Zhao ◽  
Shihui Si ◽  
Lu Wang ◽  
Ping Tang ◽  
Huijun Cao
Keyword(s):  
Electrochemical Behavior ◽  
Lead Dioxide ◽  
Flow Battery

UV-Vis spectrophotometry of quinone flow battery electrolyte for in situ monitoring and improved electrochemical modeling of potential and quinhydrone formation

2017 ◽  
Vol 19 (47) ◽  
pp. 31684-31691 ◽  
Author(s):  
Liuchuan Tong ◽  
Qing Chen ◽  
Andrew A. Wong ◽  
Rafael Gómez-Bombarelli ◽  
Alán Aspuru-Guzik ◽  
...  
Keyword(s):  
Electrochemical Behavior ◽  
In Situ Monitoring ◽  
Uv Spectrophotometry ◽  
Flow Battery ◽  
Molecular Complexation ◽  
Redox Active ◽  
Electrochemical Modeling ◽  
Aqueous Flow ◽  
Battery Electrolyte

We use in situ UV spectrophotometry to quantify molecular complexation and electrochemical behavior of redox-active quinones in an aqueous flow battery.

scholarly journals Mixed-Metal, Structural, and Substitution Effects of Polyoxometalates on Electrochemical Behavior in a Redox Flow Battery

2014 ◽  
Vol 138 ◽  
pp. 210-214 ◽  
Author(s):  
Harry D. Pratt ◽  
William R. Pratt ◽  
Xikui Fang ◽  
Nicholas S. Hudak ◽  
Travis M. Anderson
Keyword(s):  
Electrochemical Behavior ◽  
Substitution Effects ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Mixed Metal

scholarly journals REDOX PROCESSES IN THE REACTIONS OF N-ARYLSULFONYL-1,4-NAPHTНOQUINONЕIMINES WITH CERTAIN NUCLEOPHILES

2021 ◽  
Vol 26 (3(79)) ◽  
pp. 55-62
Author(s):  
A. P. Avdeenko ◽  
Yu. P. Kholmovoi ◽  
A. L. Yusina
Keyword(s):  
Redox Potential ◽  
Electrochemical Behavior ◽  
Reduced Form ◽  
Redox Processes ◽  
Redox Potentials ◽  
Reaction Products ◽  
Redox Systems ◽  
Direct Potentiometry ◽  
Average Value ◽  
Electron Proton Transfer

Quinone-hydroquinone pairs are prototypes of organic redox systems, and studies of the electrochemical behavior of these compounds are of great interest for research. Electrochemical behavior associated with the equilibrium of electron-proton transfer provides information about the molecular structure and environment of the process. Apart from chemical aspects, quinones play an important role in the biochemistry of living cells. Quinone derivatives, used as drugs for several types of human cancers, have been found to have their biological activity related to their redox behavior. Quinoneimines-aminophenols form similar pairs. In nucleophilic addition reactions of N‑substituted p-quinoneimines, parallel redox processes are often observed, and the higher the redox potential of quinoneimine, the greater the likelihood of such processes. Naphthoquinoneimines with aromatic amines and acylhydrazines follow the scheme of 1,4-addition, but as reaction products are oxidized products -4-arylsulfonylamido‑2-arylamino(2-aroylamino)-1,4-naphthoquinoneimines. The oxidant may be the original naphthoquinoneimine and oxygen. Studies have shown that oxygen in the reaction of 1,4-naphthoquinoneimines with acylhydrazines is the only oxidant that oxidizes the product of 1,4-addition, as evidenced by the study of redox potentials. Both oxidized and reduced form of the compounds, as naphthoquinoneimine and the corresponding aminonaphthol, are used to determine the redox potential by direct potentiometry. Due to the instability of the reduced form in the case of the pair naphthoquinoneimine-aminonaphthol, we used only the reduced form, which is oxidized in the cell by oxygen. The redox potential of the naphthoquinoneimine-aminonaphthol galvanic pair was determined as the average value between the potential Emax, which was established in the system upon complete oxidation of the starting substance, that is, when only naphthoquinone imine remains in the system, and the potential Emin, which was registered at the beginning of the process in the system with the reduced form – the corresponding aminonaphthol. This is the method of direct potentiometry in the variant of the middle potential.

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