A comparative study of Nafion and sulfonated poly(ether ether ketone) membrane performance for iron-chromium redox flow battery

Investigation of Nafion series membranes on the performance of iron‐chromium redox flow battery

“…The IEC results of the various membranes were measured by traditional titration methods as suggested by Sun et al 28 On the basis of their method, Nafion membranes were firstly dried inside the oven at 80°C for 48 hours and measured the weight of dry membranes. Typically, this value was strongly associated with the amount of functional groups included inside the macromolecule chains of the PEM.…”

“…In Figure 1, it is concluded that the Nafion membrane with larger thickness is profitable for restraining the interpenetration of active species. 27,28,[44][45][46] Too fast capacity decay will result in the frequent maintenance of the catholyte and anolyte, which increases the cost and complexity of the ICRFB system operation and thus is undesirable.…”

“…25 Over the past decades, a gigantic effort has been made on the scale-up and evolution of ICRFBs. 28 While nonperfluorinated PEM is still suspected to deteriorate easily in the severe oxidation and the highly acidic solution environment of ICRFBs, leading to poor cycling life during tens of years of long-term operation. 26,27 In our previous study, we have attempted to adopt the sulfonated poly (ether ether ketone) (SPEEK), which is an inexpensive and nonperfluorinated PEM as an alternative selection for ICRFB application.…”

Investigations on physicochemical properties and electrochemical performance of graphite felt and carbon felt for iron‐chromium redox flow battery

“…Generally, carbon materials are considered as desirable electrode materials for the application of ICRFB owing to their reasonable cost, high chemical stability, long cycle life, and wide operational potential range in highly oxidizing media. A variety of carbon materials, for instance, graphite felt (GF), carbon paper (CP), and carbon felt (CF), have been studied as the electrodes for ICRFBs . While because of the larger specific surface area and better three‐dimensional network structures, as well as high chemical stability and electrical conductivity, polyacrylonitrile (PAN)‐based GF and CF are preferable electrode materials …”

“…A variety of carbon materials, for instance, graphite felt (GF), carbon paper (CP), and carbon felt (CF), have been studied as the electrodes for ICRFBs. [7][8][9][10][11] While because of the larger specific surface area and better three-dimensional network structures, as well as high chemical stability and electrical conductivity, polyacrylonitrile (PAN)-based GF and CF are preferable electrode materials. [12][13][14] The production of PAN-based GF and CF includes three main steps: stabilization, carbonization, and graphitization.…”