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Title: | Polymethylhydrosiloxane-modified gas-diffusion cathode for more efficient and durable H2O2 electrosynthesis in the context of water treatment |
Author: | Xia, P. Zhao, Lele Chen, X. Ye, Z. Zheng, Z. He, Q. Sirés Sadornil, Ignacio |
Keywords: | Depuració de l'aigua Reacció d'oxidació-reducció Electroquímica Water purification Oxidation-reduction reaction Electrochemistry |
Issue Date: | 4-Nov-2023 |
Publisher: | Elsevier B.V. |
Abstract: | On-site H2O2 electrosynthesis via two-electron oxygen reduction reaction (ORR) is attracting great interest forwater treatment. The use of carbon black-based gas-diffusion electrodes (GDEs) is especially appealing, but theiractivity, selectivity and long-term stability must be improved. Here, a facile GDEs modification strategy usingtrace polymethylhydrosiloxane (PMHS) allowed reaching a outstanding H2O2 production, outperforming theconventional polytetrafluoroethylene (PTFE)-GDE (1874.8 vs 1087.4 mg L-1 at 360 min). The superhydrophobicityconferred by PMHS endowed the catalytic layer with high faradaic efficiencies (76.2%-89.7%)during long-term operation for 60 h. The electrochemical tests confirmed the high activity and selectivity of thePMHS-modified GDE. Moreover, the efficient degradation of several micropollutants by the electro-Fentonprocess demonstrated the great potential of the new GDE. An in-depth understanding of the roles of PMHSfunctional groups is provided from DFT calculations: the -CH3 groups contribute to form a superhydrophobicinterface, whereas Si-H and as-formed Si-O-C sites modulate the coordination environment of active carboncenters. |
Note: | Reproducció del document publicat a: https://doi.org/10.1016/j.apcatb.2023.123467 |
It is part of: | Applied Catalysis B-Environmental, 2023, vol. 343, p. 1-11 |
URI: | http://hdl.handle.net/2445/206789 |
Related resource: | https://doi.org/10.1016/j.apcatb.2023.123467 |
ISSN: | 0926-3373 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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