scholarly journals Realization of an Asymmetric Non‐Aqueous Redox Flow Battery through Molecular Design to Minimize Active Species Crossover and Decomposition

2020 ◽  
Vol 26 (24) ◽  
pp. 5369-5373 ◽  
Author(s):  
Anuska Shrestha ◽  
Koen H. Hendriks ◽  
Mathew S. Sigman ◽  
Shelley D. Minteer ◽  
Melanie S. Sanford
Keyword(s):  
Molecular Design ◽  
Active Species ◽  
Redox Flow Battery ◽  
Flow Battery

scholarly journals Thermo-Electrochemical Redox Flow Battery for Continuous Conversion of Low-Grade Waste Heat to Power

2022 ◽  
Author(s):  
Jorrit Bleeker ◽  
Stijn Reichert ◽  
Joost Veerman ◽  
David Vermaas
Keyword(s):  
Seebeck Coefficient ◽  
Waste Heat ◽  
Active Species ◽  
Stable Operation ◽  
Low Grade ◽  
Redox Potentials ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Ohmic Resistance ◽  
Heat Recuperation

Abstract Here we assess the route to convert low grade waste heat (<100°C) into electricity by leveraging the temperature dependency of redox potentials (Seebeck effect). We use fluid-based redox-active species, which can be easily heated and cooled using heat exchangers. By using a first principles approach, we designed a redox flow battery system with Fe(CN)63−/Fe(CN)64− and I−/I3− chemistry. We evaluate the continuous operation with one flow cell at high temperature and one at low temperature. We show that the most sensitive parameter, the Seebeck coefficient, can be controlled via the redox chemistry, the reaction quotient and solvent additives, and we present the highest Seebeck coefficient for this RFB chemistry. A power density of 0.6 W/m2 and stable operation for 2 hours are achieved experimentally. We predict high (close to Carnot) heat-to-power efficiencies if challenges in the heat recuperation and Ohmic resistance are overcome, and the Seebeck coefficient is further increased.

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.

scholarly journals Effects of active species transport on current density distribution and performance in redox flow battery

2017 ◽  
Vol 83 (849) ◽  
pp. 16-00458-16-00458 ◽  
Author(s):  
Yutaka TABE ◽  
Masamichi UCHIYAMA ◽  
Ryo SHIMADA ◽  
Kengo SUZUKI ◽  
Takemi CHIKAHISA
Keyword(s):  
Density Distribution ◽  
Current Density ◽  
Current Density Distribution ◽  
Active Species ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Species Transport ◽  
And Performance

scholarly journals Cerium/Ascorbic Acid/Iodine Active Species for Redox Flow Energy Storage Battery

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3443
Author(s):  
Tzu-Chin Chang ◽  
Yu-Hsuan Liu ◽  
Mei-Ling Chen ◽  
Chen-Chen Tseng ◽  
Yung-Sheng Lin ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Composite Electrode ◽  
Active Species ◽  
Ion Pair ◽  
Vanadium Redox Flow Battery ◽  
Carbon Paper ◽  
Nitrate Hexahydrate ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Oxidation Reduction

In this study, we developed a novel cerium/ascorbic acid/iodine active species to design a redox flow battery (RFB), in which the cerium nitrate hexahydrate [Ce(NO3)3·6H2O] was used as a positive Ce3+/Ce4+ ion pair, and the potassium iodate (KIO3) containing ascorbic acid was used as a negative I2/I− ion pair. In order to improve the electrochemical activity and to avoid cross-contamination of the redox pair ions, the electroless plating and sol–gel method were applied to modify the carbon paper electrode and the Nafion 117 membrane. The electrocatalytic and electrochemical properties of the composite electrode using methanesulfonic acid as a supporting electrolyte were assessed using the cyclic voltammetry (CV) test. The results showed that the Ce (III)/Ce (IV) active species presented a symmetric oxidation/reduction current ratio (1.09) on the C–TiO2–PdO composite electrode. Adding a constant amount of ascorbic acid to the iodine solution led to a good reversible oxidation/reduction reaction. Therefore, a novel Ce/ascorbic acid/I RFB was developed with C–TiO2–PdO composite electrodes and modified Nafion 117–SiO2–SO3H membrane using the staggered-type flow channel, of which the energy efficiency (EE%) can reach about 72%. The Ce/ascorbic acid/I active species can greatly reduce the electrolyte cost compared to the all-vanadium redox flow battery system, and it therefore has greater development potential.

scholarly journals Near Neutral pH Redox Flow Battery with Low Permeability and Long-Lifetime Phosphonated Viologen Active Species

2020 ◽  
Vol MA2020-02 (41) ◽  
pp. 2679-2679
Author(s):  
Martin Jin ◽  
Eric M. Fell ◽  
Lucia Vina-Lopez ◽  
Peter Winston Michalak ◽  
Yan Jing ◽  
...  
Keyword(s):  
Active Species ◽  
Low Permeability ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Neutral Ph ◽  
Long Lifetime

scholarly journals Mass Transport Optimization for Redox Flow Battery Design

2020 ◽  
Vol 10 (8) ◽  
pp. 2801 ◽  
Author(s):  
Nicholas Gurieff ◽  
Declan Finn Keogh ◽  
Mark Baldry ◽  
Victoria Timchenko ◽  
Donna Green ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Pump Energy ◽  
Energy Transition ◽  
Active Species ◽  
Operating Conditions ◽  
Vanadium Redox Flow Battery ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Charge Voltage ◽  
Available Energy

The world is moving to the next phase of the energy transition with high penetrations of renewable energy. Flexible and scalable redox flow battery (RFB) technology is expected to play an important role in ensuring electricity network security and reliability. Innovations continue to enhance their value by reducing parasitic losses and maximizing available energy over broader operating conditions. Simulations of vanadium redox flow battery (VRB/VRFB) cells were conducted using a validated COMSOL Multiphysics model. Cell designs are developed to reduce losses from pump energy while improving the delivery of active species where required. The combination of wedge-shaped cells with static mixers is found to improve performance by reducing differential pressure and concentration overpotential. Higher electrode compression at the outlet optimises material properties through the cell, while the mixer mitigates concentration gradients across the cell. Simulations show a 12% lower pressure drop across the cell and a 2% lower charge voltage for improved energy efficiency. Wedge-shaped cells are shown to offer extended capacity during cycling. The prototype mixers are fabricated using additive manufacturing for further studies. Toroidal battery designs incorporating these innovations at the kW scale are developed through inter-disciplinary collaboration and rendered using computer aided design (CAD).

scholarly journals A systematic study of the co-solvent effect for an all-organic redox flow battery

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24422-24427 ◽  
Author(s):  
Xiang Wang ◽  
Xueqi Xing ◽  
Yongjie Huo ◽  
Yicheng Zhao ◽  
Yongdan Li
Keyword(s):  
Solvent Effect ◽  
Systematic Study ◽  
Active Species ◽  
Redox Flow Battery ◽  
Flow Battery

BP/DBB are used as active species in AORFB. The solubility of DBB is increased by co-solvents.

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