The role of oxygenic groups and sp3 carbon hybridization in activated graphite electrodes for vanadium redox flow batteries

ChemSusChem ◽  
2021 ◽  
Author(s):  
Ali Hassan ◽  
Asnake Sahele Haile ◽  
Theodore Tzedakis ◽  
Heine Anton Hansen ◽  
Piotr de Silva
Keyword(s):  
Graphite Electrodes ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

scholarly journals The Role of Oxygenic Groups and Sp3 Carbon Hybridization in Activated Graphite Electrodes for Vanadium Redox Flow Batteries

2021 ◽  
Author(s):  
Ali Hassan ◽  
Asnake Sahele Haile ◽  
Theodore Tzedakis ◽  
Heine Anton Hansen ◽  
Piotr de Silva
Keyword(s):  
Dft Calculations ◽  
Density Functional ◽  
Vanadium Redox Flow Battery ◽  
Carbon Surface ◽  
Graphite Electrodes ◽  
Functional Theory ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

<p>Graphite felt is a widely used electrode material for vanadium redox flow batteries. Electrode activation leads to the functionalization of the graphite surface with epoxy, OH, C=O, and COOH oxygenic groups and changes the carbon surface morphology and electronic</p> <p>structure; thus, improving the electrode’s electroactivity relative to the untreated graphite. In this study, we conduct density functional theory (DFT) calculations to evaluate functionalization’s</p> <p>role towards the positive half-cell reaction of the vanadium redox flow battery. The DFT calculations show that oxygenic groups improve the graphite felt’s affinity towards the VO<sup>2+</sup>/VO2<sup>+</sup> redox couple in the following order: C=O > COOH > OH > basal plane. Projected density of states (PDOS) calculations show that these groups increase the electrode’s sp<sup>3 </sup>hybridization in the same order. We conclude that the increase in the sp<sup>3</sup> hybridization is responsible for the improved electroactivity, while the oxygenic groups’ presence is responsible for this sp<sup>3</sup> increment. These insights can help in the better selection of activation processes and optimization of their parameters.</p>

scholarly journals The Role of Oxygenic Groups and Sp3 Carbon Hybridization in Activated Graphite Electrodes for Vanadium Redox Flow Batteries

2021 ◽  
Author(s):  
Ali Hassan ◽  
Asnake Sahele Haile ◽  
Theodore Tzedakis ◽  
Heine Anton Hansen ◽  
Piotr de Silva
Keyword(s):  
Dft Calculations ◽  
Density Functional ◽  
Vanadium Redox Flow Battery ◽  
Carbon Surface ◽  
Graphite Electrodes ◽  
Functional Theory ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

<p>Graphite felt is a widely used electrode material for vanadium redox flow batteries. Electrode activation leads to the functionalization of the graphite surface with epoxy, OH, C=O, and COOH oxygenic groups and changes the carbon surface morphology and electronic</p> <p>structure; thus, improving the electrode’s electroactivity relative to the untreated graphite. In this study, we conduct density functional theory (DFT) calculations to evaluate functionalization’s</p> <p>role towards the positive half-cell reaction of the vanadium redox flow battery. The DFT calculations show that oxygenic groups improve the graphite felt’s affinity towards the VO<sup>2+</sup>/VO2<sup>+</sup> redox couple in the following order: C=O > COOH > OH > basal plane. Projected density of states (PDOS) calculations show that these groups increase the electrode’s sp<sup>3 </sup>hybridization in the same order. We conclude that the increase in the sp<sup>3</sup> hybridization is responsible for the improved electroactivity, while the oxygenic groups’ presence is responsible for this sp<sup>3</sup> increment. These insights can help in the better selection of activation processes and optimization of their parameters.</p>

Detrimental role of hydrogen evolution and its temperature-dependent impact on the performance of vanadium redox flow batteries

2019 ◽  
Vol 32 ◽  
pp. 57-62 ◽  
Author(s):  
Abdulmonem Fetyan ◽  
Gumaa A. El-Nagar ◽  
Iver Lauermann ◽  
Maike Schnucklake ◽  
Jonathan Schneider ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Temperature Dependent ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

Unveiling the Role of Heteroatom Gradient-Distributed Carbon Fibers for Vanadium Redox Flow Batteries with Long Service Life

2019 ◽  
Vol 11 (12) ◽  
pp. 11451-11458 ◽  
Author(s):  
Xiong-Wei Wu ◽  
Qi Deng ◽  
Chang Peng ◽  
Xian-Xiang Zeng ◽  
An-Jun Wu ◽  
...  
Keyword(s):  
Service Life ◽  
Carbon Fibers ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

Role of Bismuth in the Electrokinetics of Silicon Photocathodes for Solar Rechargeable Vanadium Redox Flow Batteries

ChemSusChem ◽  
2017 ◽  
Vol 11 (1) ◽  
pp. 125-129 ◽  
Author(s):  
Cristina Flox ◽  
Sebastián Murcia-López ◽  
Nina M. Carretero ◽  
Carles Ros ◽  
Juan R. Morante ◽  
...  
Keyword(s):  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

The role of phosphate additive in stabilization of sulphuric-acid-based vanadium(V) electrolyte for all-vanadium redox-flow batteries

2017 ◽  
Vol 363 ◽  
pp. 234-243 ◽  
Author(s):  
Nataliya V. Roznyatovskaya ◽  
Vitaly A. Roznyatovsky ◽  
Carl-Christoph Höhne ◽  
Matthias Fühl ◽  
Tobias Gerber ◽  
...  
Keyword(s):  
Sulphuric Acid ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

Role of vanadium redox flow batteries in the energy management system of isolated microgrids

2021 ◽  
Vol 40 ◽  
pp. 102673
Author(s):  
Maryam Mohiti ◽  
Mohammadreza Mazidi ◽  
Navid Rezaei ◽  
Mohammad-Hassan Khooban
Keyword(s):  
Energy Management ◽  
Management System ◽  
Energy Management System ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox
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