| Full text | |
| Author(s): Show less - |
Choi, Ji Sik
;
Fortunato, Guilherme, V
;
Malinovic, Marko
;
Koh, Ezra S.
;
Aymerich-Armengol, Raquel
;
Scheu, Christina
;
Wang, Huize
;
Hutzler, Andreas
;
Hofmann, Jan P.
;
Lanza, Marcos R. V.
;
Ledendecker, Marc
Total Authors: 11
|
| Document type: | Journal article |
| Source: | NANO ENERGY; v. 137, p. 10-pg., 2025-03-04. |
| Abstract | |
Traditionally, evaluating a catalyst's activity has focused on its intrinsic properties. However, the observed catalytic behavior can be significantly influenced by both systematic parameters and mesoscopic mass transport limitations. Although the independent roles of various factors are known, their intricate interplay within electrocatalysis remains elusive. This work presents a comprehensive investigation into the interplay between these factors in the selective generation of hydrogen peroxide (H2O2) via the oxygen reduction reaction (ORR) using Aux/C catalysts with varying particle sizes. By considering the exchange of surface-bound reaction intermediates between the electrode and bulk electrolyte, we reveal how the catalyst's surface area can influence selectivity through kinetic competition. This effect becomes particularly relevant for technologically important reactions such as the ORR, where multiple product pathways exist. This study underscores the need for a multi-scale approach that considers all these factors, especially for reactions involving multiple reaction pathways. Precise tuning of these parameters is essential for achieving a reliable and equitable assessment of electrocatalysts, paving the way for optimizing H2O2 production and similar multi-step electrocatalytic reactions. (AU) | |
| FAPESP's process: | 19/04421-7 - Production and characterization of metal-graphene or graphene oxide nanocomposites for the electrocatalytic production of hydrogen peroxide: Application to the degradation of endocrine disrupting chemicals by electrochemical advanced oxidation processes |
| Grantee: | Guilherme Vilalba Fortunato |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 21/14194-8 - Production and characterization of metal-graphene or graphene oxide nanocomposites for the electrocatalytic production of hydrogen peroxide: application to the degradation of endocrine disrupting chemicals by electrochemical advanced oxidation processes |
| Grantee: | Guilherme Vilalba Fortunato |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| 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 |