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Joule Heating in Controlled Atmospheres to Process Nanocarbon/Transition Metal Oxide Composites and Electrodes.
Upama, Shegufta; Arevalo, Luis; Pendashteh, Afshin; Mikhalchan, Anastasiia; Green, Micah J; Vilatela, Juan Jose.
Afiliação
  • Upama S; Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77843, United States.
  • Arevalo L; IMDEA Materials Institute, Getafe, Madrid 28906, Spain.
  • Pendashteh A; IMDEA Materials Institute, Getafe, Madrid 28906, Spain.
  • Mikhalchan A; IMDEA Materials Institute, Getafe, Madrid 28906, Spain.
  • Green MJ; IMDEA Materials Institute, Getafe, Madrid 28906, Spain.
  • Vilatela JJ; Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77843, United States.
ACS Appl Nano Mater ; 7(12): 14557-14565, 2024 Jun 28.
Article em En | MEDLINE | ID: mdl-38962506
ABSTRACT
Composites of nanocarbons and transition metal oxides combine excellent mechanical properties and high electrical conductivity with high capacitive active sites. These composites are promising for applications such as electrochemical energy conversion and storage, catalysis, and sensing. Here, we show that Joule heating can be used as a rapid out-of-oven thermal processing technique to crystallize the inorganic metal oxide matrix within a carbon nanotube fabric (CNTf) composite. We choose manganese oxide and vanadium oxide as model metal oxides and show that the Joule heating process is rapid and enables accurate control over the temperature and phase transitions. Next, we use thermogravimetric analysis and Joule heating experiments in controlled atmospheres to show that metal oxides can actually catalyze thermal degradation and reduce the thermal stability of the CNTs, which could limit processing of many oxides. We solve this by using a reducing hydrogen atmosphere to successfully extend the Joule processing window and thermal stability of the CNTf/metal oxide composite to ∼1000 °C.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article