redox flow battery
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2022 ◽  
Vol 521 ◽  
pp. 230912
Pham Tan Thong ◽  
Kanalli V. Ajeya ◽  
Karmegam Dhanabalan ◽  
Sung-Hee Roh ◽  
Won-Keun Son ◽  

Qiang Li ◽  
Junnan Wang ◽  
Tianyu Zhang ◽  
Zinan Wang ◽  
Zhichao Xue ◽  

Abstract In a vanadium redox flow battery, the traditional polyacrylonitrile based graphite felt (GF) electrode suffers the problems of low electrochemical catalytic activity and low specific surface area. To improve the performance of the GF electrode, we prepared phosphorus and sulphur co-doped reduced graphene oxide (PS-rGO) as catalyst with the simple treatment of reduced graphene oxide (rGO) in the mixture of phytic acid and sulfuric acid. The GF electrode modified with PS-rGO (PS-rGO-GF) was characterized by scanning electron microscope, specific surface area, X-ray photoelectron spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, and charge-discharge tests. The PS-rGO-GF shows enhanced performance toward VO2+/VO2+ redox reaction. The battery with the PS-rGO decorated GF presents an excellent battery performance with the energy efficiency of 81.37 % at the current density of 80 mA cm-2 and the corresponding discharge capacity of 772 mAh due to the high catalytic activity of PS-rGO.

2022 ◽  
Jorrit Bleeker ◽  
Stijn Reichert ◽  
Joost Veerman ◽  
David Vermaas

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.

2022 ◽  
Vol 101 ◽  
pp. 96-110
Désirée Ruiz-Martín ◽  
Daniel Moreno-Boza ◽  
Rebeca Marcilla ◽  
Marcos Vera ◽  
Mario Sánchez-Sanz

2022 ◽  
Vol 119 (1) ◽  
pp. 201-217
M. Narendra Kumar ◽  
S. Manoj Kumar ◽  
G. C. Vijayakumar ◽  
K. Kadirgama ◽  
M. Samykano ◽  

2022 ◽  
pp. 130503
Emmanuel Shittu ◽  
Rathod Suman ◽  
Musuwathi Krishnamoorthy Ravikumar ◽  
Ashok Kumar Shukla ◽  
Guangling Zhao ◽  

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