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Interplay between morphology and electrochemical performance of 'core–shell' electrocatalysts for oxygen reduction reaction based on a PtNix carbon nitride 'shell' and a pyrolyzed polyketone nanoball 'core'
- Publication Year :
- 2014
-
Abstract
- The interplay between morphology and electrochemical performance of a new class of “core–shell” electrocatalysts for the oxygen reduction reaction (ORR) is studied. The electrocatalysts, labelled PtNi–CNl Tf/STp, consist of a “core” of pyrolyzed polyketone nanoballs (indicated as STp “core” support) covered by a carbon nitride (CN) “shell” matrix embedding PtNix alloy NPs (indicated as PtNix-CN). The electrocatalysts are characterized by means of: (a) high-resolution transmission electron microscopy (HR-TEM); and (b) cyclic voltammetry with the thin-film rotating ring-disk electrode (CV-TF-RRDE) method. The structure of the STp “core” supports and the details of the preparation procedure, such as pyrolysis temperature, Tf, and treatment with H2O2, play a crucial role on modulating: (a) the morphology; and (b) the ORR performance of the electrocatalysts. In particular, the best results are achieved for PtNi–CNl Tf/STp systems: (a) including a STp “core” support with a high porosity; and (b) obtained at Tf = 600 °C. It is demonstrated that in general, the treatment with H2O2 of electrocatalysts is detrimental for the ORR performance. Nevertheless, in particular conditions, the treatment in H2O2 improves the ORR performance of PtNi-CNl Tf/STp. The results presented in this work allow to elucidate the complex correlation existing between: (a) the composition; (b) the interactions in PtNix-CN; (c) the morphology of STp and PtNi–CNl Tf/STp; and (d) the ORR performance of the electrocatalysts.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
"Core-shell" carbon nitride (CN) electrocatalysts, CV-TF-RRDE method, HR-TEM, Oxygen reduction reaction, PEM fuel cells
Energy Engineering and Power Technology
Proton exchange membrane fuel cell
Nanotechnology
CV-TF-RRDE method
Condensed Matter Physics
Electrochemistry
PEM fuel cells
HR-TEM
Oxygen reduction reaction
chemistry.chemical_compound
Fuel Technology
Chemical engineering
chemistry
Transmission electron microscopy
Polyketone
Electrode
"Core-shell" carbon nitride (CN) electrocatalysts
Cyclic voltammetry
Carbon nitride
Pyrolysis
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....55e5bdb1419ea25251c5d0f8aca7f863