PDF Publication Title:
Text from PDF Page: 054
Hazardous zinc perchlorate is used as both positive and negative support electrolyte, while the relatively large size of the micelles prevents their transport through the membrane. At the very low operational current density of 1.5 mA cm–2 the device produces a cell potential of ca. 2 V and a current efficiency of 98%. This and similar polymer-based RFBs have not yet demonstrated cycling stability under realistic operational conditions. 7. New trends on zinc-based redox flow batteries 7.1 Zinc polymer electrodes In addition to the carbon and metallic substrates previously discussed, the negative electrode can also consist of a zinc polymer composite. Such electrodes can prevent dendritic zinc depositions and reduce both electrode shape change and self-discharge rate due to zinc dissolution, thus improving electrode cycle life. One example of this is the plastic bonded electrode, in which zinc oxide powder is combined with PTFE using organic solvent in a calendaring process. The PTFE is fibrillated to form a nanoscale, three-dimensional electrode matrix. The locking of the active materials into this structure mitigates the problems of electrode shape change and dendritic zinc electrodeposition morphology [42]. An early comparison of the cycling performance of porous zinc electrodes in the absence and presence of different polymers at varying concentrations was carried out by Hampson and McNeil [284]. In this case, the electrodes were pasted Zn/ZnO with concentrations of various polymers up to 50%, which were then painted and pressed onto copper gauze substrates. The resultant electrodes were cycled in a 7 mol dm–3 KOH solution. It was found that polystyrene and polyvinylchloride addition could not improve cycle life at any concentration and polyvinyl acetate, polyisoprene and polymethyl methacrylate produced only small improvements at concentrations of 10% or less. This reduction in performance was attributed 54PDF Image | hybrid redox flow batteries with zinc negative electrodes
PDF Search Title:
hybrid redox flow batteries with zinc negative electrodesOriginal File Name Searched:
Zn_Negative_RFB_Review_24_Jan_2018.pdfDIY PDF Search: Google It | Yahoo | Bing
Salgenx Redox Flow Battery Technology: Power up your energy storage game with Salgenx Salt Water Battery. With its advanced technology, the flow battery provides reliable, scalable, and sustainable energy storage for utility-scale projects. Upgrade to a Salgenx flow battery today and take control of your energy future.
| CONTACT TEL: 608-238-6001 Email: greg@salgenx.com | RSS | AMP |