The experiment is really simple. When I do a bulk electrolysis with 1% TFAA (ACN solution) to get dihydrogen, what is going to be oxidized? (working electrode graphit, counter electrode platinum, referenz electrode Ag/AgCl, solvent ACN, conducting salt Bu4NBF4, E = - 0.66 V, IKA electrasyn 2.0)
Do I get the peroxid acid CF3COO-OOCCF3?
What´s happening, if I use HBF4 instead of TFAA?
he generation of HO2- in alkaline medium takes place in the (-0.2 V) (-0.4 V) potential range with both electrodes. On the graphite electrode the HO2- generation efficiency is around 9 times greater than that on the Ni0.3Co2.7O4 spinel electrode. The phenol degradation at controlled E depends on the type of system used (batch vs. flow), which can induce a local HO2- variation. Using the batch system, 32% and 21% of phenol are oxidized by the HO2- ions electro generated on the graphite electrode (at -0.35 V) and on the oxide electrode (at -0.15 V), respectively. In the case of the flow electrolyte system (DCEFC), the phenol conversion reached 7% at -0.35 V on the graphite electrode and 22% on the oxide electrode at -0.15 V. In both systems, the oxide produces similar amounts of HO2-.
Our results show that the oxidation of phenol also leads to polymeric products on both types of electrodes, which affects their performance. We consider that it is feasible to increase the indirect phenol degradation by using HO2- electro generated on a Ni0.3Co2.7O4 electrode in DCEFC upon adding Fenton's reagent, but for this to happen it would be necessary to protect the electrode against corrosion by acid. Despite this, the use of the oxide electrode presents several advantages, including a low potential for the electrolysis, better efficiency under flow conditions, and a very small mass because it can be used in thin films.
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