| Full text | |
| Author(s): |
Carrilho, Caroline de O.
;
de Jesus, Juliana M. S.
;
Moura, Joa O. Paulo C.
;
Santos, Dara Silva
;
Trench, Aline B.
;
Fernandes, Caio Machado
;
Santos, Aila O.
;
Alves, Odivaldo C.
;
Silva, Julio C. M.
;
dos Santos, Mauro C.
Total Authors: 10
|
| Document type: | Journal article |
| Source: | Electrochimica Acta; v. 550, p. 12-pg., 2026-02-20. |
| Abstract | |
The sustainable electrogeneration of hydrogen peroxide (H2O2) via the two-electron oxygen reduction reaction (2e- ORR) represents a promising alternative to conventional production methods. In this study, CeO2 and CeO2MnOx nanoparticles were synthesized and supported on Vulcan XC-72 carbon at varying loadings (1, 3, and 5%), aiming to assess the lowest metal loading and high H2O2 electrosynthesis. Physicochemical characterizations confirmed the successful formation of CeO2 nanowires and the effectiveness of the MnOx surface modification. XRD, TEM, XPS, EPR, and contact angle analyses revealed that CeO2 loading increased surface hydrophilicity due to oxygenated functional groups, thereby favoring electrochemical activity. On the other hand, all CeO2MnOx loadings were statistically equal to Vulcan XC-72 in terms of contact angle. Electrochemical evaluations using a rotating ring-disk electrode (RRDE) demonstrated enhanced ORR activity and high H2O2 selectivity for the 1% CeO2MnOx/C and 3% CeO2/C catalysts, achieving up to 90% selectivity and elevated ring currents. The results suggest that low metal loading and surface modification via MnOx improve the balance between active site exposure, oxygen adsorption, and intermediate stabilization, thus favoring the selective 2epathway. These findings support the development of cost-effective, non-noble-metal catalysts for the electrosynthesis of green H2O2. (AU) | |
| FAPESP's process: | 22/12895-1 - Advanced processes for the degradation of emerging pollutants: catalytic materials, electroanalytical sensors and scientific dissemination |
| Grantee: | Marcos Roberto de Vasconcelos Lanza |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 22/10484-4 - Application of low-cost nanomaterials for degradation of endocrine disruptors through advanced electrochemical oxidation processes under the influence of a magnetic field |
| Grantee: | Caio Machado Fernandes |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 22/15252-4 - Nanostructured electrocatalysts for application in direct alkaline-acid fuel cells of glycerol |
| Grantee: | Mauro Coelho dos Santos |
| Support Opportunities: | Program for Research on Bioenergy (BIOEN) - Regular Program Grants |
| FAPESP's process: | 21/14394-7 - Use of Vulcan XC-72 carbon modified with fluorine and/or cerium doped niobium nanostructures in the electrogeneration of H2O2 for degradation of endocrine disruptors by advanced electrochemical oxidative processes |
| Grantee: | Aline Barrios Trench |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 21/05364-7 - Nanostructured electrocatalysts based on manganese and tungsten oxides supported on carbon for electrogeneration of hydrogen peroxide and electrochemical degradation of ciprofloxacino |
| Grantee: | João Paulo Carvalho Moura |
| Support Opportunities: | Scholarships in Brazil - Doctorate |