Polymer electrolyte-type electrochemical ozone generator with an oxygen cathode

Characterization of an electrochemical reactor for the ozone production in electrolyte-free water

“…In agreement with the literature [11,12,15], it was verified that U EOP increases on increasing I, reaching a maximum of 13% at 130 A and 30°C. A comparison of these findings with the literature reports [2,9,18] revealed the current efficiency for EOP presented by the reactor using mesh electrodes is acceptable for practical purposes, since some of the commercially available electrochemical ozonizers operate presenting a current efficiency of *14% [2,10].…”

“…7a reveals that U decreases slightly on increasing T. Also verified is that the U versus I profile is practically linear for I C 50 A. This behavior was also verified by other authors [11,12,15]. Based on these experimental findings, it can be argued that the phenomenon governing the cell potential is the total ohmic drop across the MEA (e.g., non-ideal mechanical contact between the different materials, SPE resistance, etc.)…”

“…However, a critical review of the literature revealed that the maximum U EOP value (plateau) is indeed system-dependent [11,12,14,15,[17][18][19][20][21][22]. A plausible explanation for the influence of MEA on U EOP can be provided taking into account the electrode mechanism reported previously for the simultaneous production of oxygen and ozone using inert electrodes [5,[27][28][29][30].…”

“…From the above considerations, the evaluation of the overall reactor performance for EOP was carried out in the present study taking into account the intensive and extensive reactor parameters previously described in the literature [8,[11][12][13][14][15]. Figure 10 shows the dependence of the specific electric energy consumption for the EOP, P o EOP ; and the ozone production rate, m EOP , on applied electric current, I, and temperature, T.…”

“…The most important among them are [10,24]: (i) thickness and crosssection area of the conductive cell layers, (ii) intrinsic conductivities and the effective conductance of these materials, and (iii) effective contact area established at the SPE/electrode interface. The heat dissipated at the anode side is of prime concern because of the sensitivity of ozone current efficiency on temperature [11,12,15,19]. According to the literature [13,34], the overall rate of heat dissipation is governed by a complex process comprising the heat transfer through the metallic components of the MEA and by the leaving gas products.…”