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7.3.3.1 Electrode enhancement Initially, , similarly as the treatment done for the cathode electrode, the commercial pristine carbon felt electrode (CF) is subjected to a plasma treatment in oxygen atmosphere, with the purpose of increase its active surface area, as well as hydrophilicity, as the oxygen groups are boost269. Next, a similar hydrothermal process, but this time, it is used graphene oxide (GO) with the purpose of elevate the electron transfer rate due to the great graphene conductivity nature, which has not worked for t. Afterwards, two different pathways are followed. Firstly, a hydrothermal process introducing the quinone molecule, p-benzoquinone, as aromatic electron transfer material which can interact between the carbon substrate (CF-rGO) and the quinone active material (AQ27DS) solved in the electrolyte. It is done with the objective of facilitate the interactions electrode-electrolyte. Secondly a similar molecule but in this case an aliphatic hydrocarbon molecule with the aim of confirm the previous statement and observe if this molecule can also enhance the interactions between the electrode and the electrolyte. 7.3.3.1.1 Characterization CF CF-HT CF-rGO CF- rGO/ROH CF- rGO/Q Carbon pattern 10 20 30 40 50 60 70 80 2 Theta / deg Figure 7.22. - XRD spectra for the samples CF, CF-HT, CF-rGO, CF-rGO/ROH and CF-rGO/Q compared with the graphite pattern. Relative Intensity / % 177PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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