Hydrogen peroxide production by enhanced electrocatalysts is an attractive alternative to the present commercial process. While the subnano/atomic dispersion in noble metal nanocatalysts is known to strongly enhance their catalytic efficiency and chemoselectivity, their excessive surface energy and consequent coarsening seriously compromise their physical/chemical stability. Here, we report a subnano/atomically dispersed Pt-Ag alloy (by a simply modified polyol process) that is resistant to agglomeration/Ostwald ripening. This catalyst does not follow a conventional four-electron oxygen reduction reaction (ORR) but selectively produces H2O2without excessive degradation of its activity. We clarified the role of the alloying element, Ag, as follows: (1) selective activation of two-electron ORR by inhibiting O2dissociation and (2) suppression of H2O2decomposition by preventing the H2O2adsorption. The present approach provides a convenient route for the direct generation of H2O2as a simple byproduct of electricity generation by fuel-cell systems.
Bibliographical noteFunding Information:
This work was supported by institutional program grants (2E30410 and 2E30300) from the Korea Institute of Science and Technology. This work was also supported by the National Research Council of Science & Technology (NST) grant by the Korean government (MSIP) (No. CAP-17-04-KRISS) and by the National Institute of Supercomputing and Network/Korea Institute of Science and Technology Information with supercomputing resources, including technical support, KSC-2017-C2-0044.
© The Royal Society of Chemistry 2020.
ASJC Scopus subject areas
- General Chemistry
- Renewable Energy, Sustainability and the Environment
- General Materials Science