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Electrothermal Transformations within Graphene-Based Aerogels through High-Temperature Flash Joule Heating.

Dong XiaJamie ManneringPeng HuangYifei XuQun LiHeng LiYi QinAlexander N KulakRobert Menzel
Published in: Journal of the American Chemical Society (2023)
Flash Joule heating of highly porous graphene oxide (GO) aerogel monoliths to ultrahigh temperatures is exploited as a low carbon footprint technology to engineer functional aerogel materials. Aerogel Joule heating to up to 3000 K is demonstrated for the first time, with fast heating kinetics (∼300 K·min -1 ), enabling rapid and energy-efficient flash heating treatments. The wide applicability of ultrahigh-temperature flash Joule heating is exploited in a range of material fabrication challenges. Ultrahigh-temperature Joule heating is used for rapid graphitic annealing of hydrothermal GO aerogels at fast time scales (30-300 s) and substantially reduced energy costs. Flash aerogel heating to ultrahigh temperatures is exploited for the in situ synthesis of ultrafine nanoparticles (Pt, Cu, and MoO 2 ) embedded within the hybrid aerogel structure. The shockwave heating approach enables high through-volume uniformity of the formed nanoparticles, while nanoparticle size can be readily tuned through controlling Joule-heating durations between 1 and 10 s. As such, the ultrahigh-temperature Joule-heating approach introduced here has important implications for a wide variety of applications for graphene-based aerogels, including 3D thermoelectric materials, extreme temperature sensors, and aerogel catalysts in flow (electro)chemistry.
Keyphrases
  • reduced graphene oxide
  • risk assessment
  • particulate matter
  • ionic liquid
  • climate change
  • quantum dots
  • low cost
  • metal organic framework
  • walled carbon nanotubes