Xia, PanZhao, LeleChen, XiYe, ZhihongZheng, Zhihong.He, QiangSirés Sadornil, Ignacio2024-01-312024-01-312023-11-040926-3373https://hdl.handle.net/2445/206789On-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.11 p.application/pdfengcc-by-nc-nd (c) Xia, P. et al., 2023http://creativecommons.org/licenses/by-nc-nd/4.0/Depuració de l'aiguaReacció d'oxidació-reduccióElectroquímicaWater purificationOxidation-reduction reactionElectrochemistryinfo:eu-repo/semantics/article7404712024-01-31info:eu-repo/semantics/openAccess