Nicholas Gurieff gave a presentation on new concepts for alternative vanadium redox flow battery cell and stack designs. Initial studies showed that a tapered cell design provided slightly better performance than conventional rectangular cell designs. This new concept also allows the possibility for constructing toroidal stacks with potentially smaller space requirements. Jens Noack gave a presentation on current activities in the field of international standardization of redox flow batteries. This year the publication of three standards specifically developed for redox flow batteries is expected.
Several CENELEST members took part in this year’s Smart Energy Conference and Exhibition in Sydney/Australia. In addition to presentations, numerous companies were represented as exhibitors at the two-day event. CENELEST participated as an exhibitor with its own booth. During the two days countless discussions were held and numerous new contacts from the international and national Australian sector of energy storage were established.
We have published an open access article about the effect of the counter ion in the electrolyte of Vanadium Redox Flow Batteries (VRFB). Sulphate and pure chloride based electrolytes have been compared regarding its electrochemical properties in half-cells and batteries. We show here that the usage of pure chloride based electrolyts results in lower performance and a reaction of V(V) with chlorine.
Vanadium Electrolyte for All-Vanadium Redox-Flow Batteries: The Effect of the Counter Ion
N. Roznyatovskaya, J. Noack, H. Mild, M. Fühl, P. Fischer, K. Pinkwart, J. Tübke, M. Skyllas-Kazacos, Batteries 2019, 5, 13 (OPEN ACCESS)
We published an open access article about a Vanadium Oxygen Fuel Cell (VOFC) utilising up to 3.6 mol/L high concentration vanadium electrolyte. Compared to Vanadium Redox Flow Batteries, VOFCs allow much higher theoretical energy density by the replacement of the positive electrolyte with an oxygen (air) electrode. The replacement allows the usage of higher concentrated vanadium electrolytes which further increases the theoretical energy density. We present here a VOFC with 3.6 M vanadium solution, which has a theoretical maximum energy density of 146 Wh/L.
Vanadium Oxygen Fuel Cell Utilising High Concentration Electrolyte
M. Risbud, C. Menictas, M. Skyllas-Kazacos, J. Noack, Batteries 2019, 5(1), 24 (OPEN ACCESS)
Two weeks ago Chris Menictas attended an invited lecture at this year’s autumn conference of the Material Research Society in Boston/MA USA. In his lecture he reported on our scientific activities in the field of modelling and simulation as well as on experimental results of vanadium/air fuel cells with highly concentrated vanadium electrolytes, which potentially enable high energy densities to be achieved. He also talked about activities to reverse the reactions, i.e. the charging process in a separate cell.