Redox flow cell research

2013-03 A regenerative hydrogen-vanadium flow battery

Development of a Regenerative Hydrogen-Vanadium Fuel Cell for Energy Storage Applications. V. Yufit, B. Hale, M. Matian, P. Mazur and N. P. Brandon. Journal of the Electrochemical Society. 2013, 160, 6, A856-A861. 

V-H2A novel regenerative cell based on aqueous vanadium electrolyte V(V)/V(IV) and hydrogen was designed, assembled and tested. This cell offers several potential advantages for grid scale storage applications through its use of a gaseous anolyte coupled with a liquid catholyte. Charge and discharge experiments at different conditions showed encouraging reversibility and performance from the first tests of the concept presented here. The maximum power density achieved was 114 mW/cm2 from a cell of area 25 cm2, with supporting analysis of voltage losses by electrochemical impedance spectroscopy showing good prospects for further improvement through optimisation of cell materials and design.

2014-01 Carbon materials in redox flow batteries - A review

Application of carbon materials in redox flow batteriesM.H. Chakrabartia, N.P. Brandon, S.A. Hajimolana, F. Tariq, V. Yufit, M.A. Hashim, M.A. Hussain, C.T.J. Low, P.V. Aravind. Journal of Power Sources. 2014, 253, 150-166. 

The redox flow battery (RFB) has been the subject of state-of-the-art research by several groups around the world. Most work commonly involves the application of various low-cost carbon-polymer composites, carbon felts, cloth, paper and their different variations for the electrode materials of the RFB. Usually, the carbon-polymer composite electrode has relatively high bulk resistivity and can be easily corroded when the polarised potential on the anode is more positive than that of oxygen evolution and this kind of heterogeneous corrosion may lead to battery failure due to electrolyte leakage. Therefore, carbon electrodes with high electrical conductivity, acid-resistance and electrochemical stability are highly desirable. This review discusses such issues in depth and presents an overview on future research directions that may help commercialise RFB technology. A comprehensive discussion is provided on the advances made using nanotechnology and it is envisaged that if this is combined with ionic liquid technology, major advantages could be realised. In addition the identification of RFB failure mechanisms by means of X-ray computed nano tomography is expected to bring added benefits to the technology.

2015-04 A novel hydrogen-cerium flow battery

A novel regenerative hydrogen cerium fuel cell for energy storage applications. H. Hewa Dewage, B. Wu, A. Tsoi, V. Yufit, G. Offer and N. Brandon. Journal of Materials Chemistry A. 2015, 3, 9446-9450.

A novel regenerative hydrogen cerium fuel cell is presented which has the potential to deliver both low cost and high performance. A 5 cm2 prototype is demonstrated, achieving 148 mW.cm−2 when fully charged. Rate determining processes within the cell are identified.

H2-Ce

2016-11 Improving vanadium flow cell performance with RGO

Performance Enhancement of Reduced Graphene Oxide-Modified Carbon Electrodes for Vanadium Redox-Flow SystemsB. Chakrabarti, D. Nir, V. Yufit, F. Tariq, J. Rubio-Garcia, R. Maher, A. Kucernak, P.V. Aravind, N. Brandon. ChemElectroChem. 2016, 3, 1 – 8. 

Reduced graphene oxide (rGO) suspended in an N,N′-dimethylformamide (DMF) solvent underwent electrophoretic deposition (EPD) on carbon paper (CP) electrodes. X-ray computed micro-tomography (XMT) indicates a 24 % increase in the specific surface area of CP modified with rGO in comparison to the untreated sample. Furthermore, XMT confirms that the deposition also penetrates into the substrate. Raman analysis shows that the rGO deposited is more amorphous than the CP electrode. A significant reduction in charge-transfer resistance of the VO2+/VO2+ reaction is also observed (from impedance measurements) in modified samples in comparison to untreated CP electrodes.

rGO