The use of intermetallic Pt-Co nanocrystals (NCs) for electrocatalytic oxygen reduction reaction is quickly gaining interest thanks to the higher electrochemical stability of the intermetallic L10 phase compared to a random alloy A1 phase. However, the thermal treatment that enables the intermetallic phase transformation also causes significant NC aggregation, resulting in a significant loss of electrochemically active surface area. Herein, we report the use of microwave radiation to induce the intermetallic phase transformation in Cu-doped Pt-Co NCs. We demonstrate that microwave radiation reduces NC aggregation while allowing for a complete phase transformation in only 30 seconds. These microwave-treated NCs demonstrate higher mass activity for oxygen reduction reaction while maintaining electrochemical stability similar to the thermally-annealed samples.

Rosen DJ, Foucher AC, Lee JD, Yang SS, Marino E, Stach EA, et al. (2022). Microwave Heating of Nanocrystals for Rapid,Low-Aggregation Intermetallic Phase Transformations. ACS MATERIALS LETTERS, 4(5), 823-830 [10.1021/acsmaterialslett.2c00174].

Microwave Heating of Nanocrystals for Rapid,Low-Aggregation Intermetallic Phase Transformations

Marino E;
2022-03-30

Abstract

The use of intermetallic Pt-Co nanocrystals (NCs) for electrocatalytic oxygen reduction reaction is quickly gaining interest thanks to the higher electrochemical stability of the intermetallic L10 phase compared to a random alloy A1 phase. However, the thermal treatment that enables the intermetallic phase transformation also causes significant NC aggregation, resulting in a significant loss of electrochemically active surface area. Herein, we report the use of microwave radiation to induce the intermetallic phase transformation in Cu-doped Pt-Co NCs. We demonstrate that microwave radiation reduces NC aggregation while allowing for a complete phase transformation in only 30 seconds. These microwave-treated NCs demonstrate higher mass activity for oxygen reduction reaction while maintaining electrochemical stability similar to the thermally-annealed samples.
30-mar-2022
Settore FIS/01 - Fisica Sperimentale
Rosen DJ, Foucher AC, Lee JD, Yang SS, Marino E, Stach EA, et al. (2022). Microwave Heating of Nanocrystals for Rapid,Low-Aggregation Intermetallic Phase Transformations. ACS MATERIALS LETTERS, 4(5), 823-830 [10.1021/acsmaterialslett.2c00174].
File in questo prodotto:
File Dimensione Formato  
MicrowaveManuscript_DJR_Final_cbm1.pdf

Solo gestori archvio

Descrizione: articolo
Tipologia: Pre-print
Dimensione 1.18 MB
Formato Adobe PDF
1.18 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/640606
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 10
social impact