| Full text | |
| Author(s): |
Romeiro, Fernanda da Costa
;
Orlandi, Marcelo Ornaghi
;
Mul, Guido
;
Wenderich, Kasper
;
Mei, Bastian
Total Authors: 5
|
| Document type: | Journal article |
| Source: | Electrochimica Acta; v. 468, p. 7-pg., 2023-11-10. |
| Abstract | |
Hydrogen peroxide (H2O2) is a valuable chemical currently produced industrially on a large scale by the anthraquinone process. Recently, carbonate and/or bicarbonate-induced selective water oxidation to hydrogen peroxide has been suggested as an environmentally friendly alternative. In this manuscript, we discuss the effect of electrolyte concentration and type of cation in selective water oxidation using carbonate-based electrolytes (i.e., Na2CO3, K2CO3 and Cs2CO3) on fluorine-doped tin oxide (FTO) electrodes. Based on the experimental observations and a techno-economic evaluation we reveal that K2CO3 is preferred over Na2CO3 and Cs2CO3 electrolytes. Using 5 M K2CO3 a Faradaic efficiency of > 60 % was achieved at industrially relevant current densities of 100 mA cm(-2). Although for 5 M Cs2CO3 electrolytes lower potentials are required at otherwise similar process conditions, a lower efficiency for hydrogen peroxide formation has been observed which is assigned to higher degradation in Cs-containing electrolyte, rendering the use of potassium-based electrolytes more efficient. Independent of the electrolyte used, the electrodes suffered from stability issues as revealed by increasing concentrations of tin in the electrolyte and electrode failure after polarization for several hours. Overall, this work provides detailed knowledge about the impact of electrolyte concentration and type of cation and reveals the importance of appropriate cell design and process operation for meaningful hydrogen peroxide synthesis by mediated-anodic water oxidation. (AU) | |
| FAPESP's process: | 17/24839-0 - Nanoelectronics and nanoscale electrochemistry: fundaments and applications |
| Grantee: | Paulo Roberto Bueno |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 21/08240-7 - Electro and photoelectrochemical production of H2O2 for waste water cleaning and production of renewable fuels using pure and Nb5+ and W6+ doped Sn3O4, SnO2 semiconductors |
| Grantee: | Fernanda da Costa Romeiro |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |