Influence of electrode material on hydrogen peroxide generation by DC pinhole discharge

Abstract

Abstract:In this work, several materials were studied as electrodes in a pinhole configuration of a DC plasma discharge to estimate their effect on the efficiency of the discharge, indicated by hydrogen peroxide production. Detection was carried out using a specific titanium reagent. This was combined with ICP-OES analysis of the final solutions to determine the difference between the amount of electrode material released during the discharge operation and electrolysis experiment carried out under the same conditions. It was found that from seven studied electrode materials, graphite gives the best results, while lower cost aluminum and titanium-zinc still work well. The most unsuitable materials were copper and brass; in these cases, no hydrogen peroxide was detected in the cathode part of the reactor. Results obtained by ICP analysis indicate that even in the case of brass, the absence of hydrogen peroxide is due to the presence of copper in the material. It probably affects both directly the phase of discharge creation and propagation and the decomposition reactions.

Substrate oxidation enhances the electrochemical production of hydrogen peroxide

“…(3)) cannot be ruled out. To test this possibility, the carbon cathode was replaced by a stainless steel cathode that has a lower activity for the electrochemical production of H 2 O 2 than a graphite rod [39]. However, in spite of a significant reduction in the rate of H 2 O 2 formation on the stainless steel cathode, the concomitant degradation of BPA was only slightly reduced compared to case of graphite rod cathode (Fig.…”

Ultra‐small CuO nanoparticles with tailored energy‐band diagram synthesized by a hybrid plasma‐liquid process

“…The plasma-ethanol interface is also known to produce radicals leading to the formation of hydrogen peroxide (H 2 O 2 ) [52,53,61] and we have confirmed that also in our case H 2 O 2 is produced and consumed by equation (3) (see Supporting Information). [62] The interaction of locally produced (i.e., close to the interface) H 2 O 2 with reduced copper atoms then leads to the formation of CuO, [63,64] where the very high reaction rates of solvated electrons and the non-acidic state (>6 pH; measured before and after synthesis, see Supporting Information) prevents Fentonlike reactions with the Cu-ions. [51,65] The size of the NPs is then determined by the local concentration of coalescing CuO.…”

Influence of solution properties and gas addition on hydrogen peroxide production by a novel plasma source

“…Aluminium was quite easily sputtered by the discharge, but it had been reported that this element did not decrease the hydrogen peroxide formation a lot [21]. The second electrode material, which we used in experiments presented in this paper, was platinum which was not sputtered so rapidly, but it can serve as a surface catalyser in hydrogen peroxide decomposition [21]. We chose this stable material for comparative measurements supposing that it had the same effect in all experiments.…”