Understanding the Joule-heating behaviours of electrically-heatable carbon-nanotube aerogels

Xia, Dong; Li, Heng; Huang, Peng

doi:10.1039/d0na01002b

Cited by 7 publications

(3 citation statements)

References 37 publications

(43 reference statements)

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“…Based on this approach, it is estimated that, at a power input of 120 W, an ultrahigh temperature of around 3000 K is reached in the center of the aerogel monolith, an extremely high value close to the melting point of graphitic carbon allotropes . This steady-state core temperature is almost an order of magnitude higher than for many previously reported aerogel heating studies on GO-derived aerogels (Figure i, Table S2, Supporting Information), ,,,,,− mainly due to the high power inputs employed here. It is also worth noting that ultrahigh aerogel heating was achieved here at comparatively low voltage inputs (10 V or lower, Figure i), due to the relatively high graphitic quality and corresponding high electrical conductivity of rGO aerogels (here, σ rGOaeroel = 81 S m –1 ).…”

Section: Resultsmentioning

confidence: 63%

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

Xia,

Mannering,

Huang

et al. 2023

J. Am. Chem. Soc.

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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. Ultrahightemperature 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 Jouleheating 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.

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Section: Resultsmentioning

confidence: 63%

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

Xia,

Mannering,

Huang

et al. 2023

J. Am. Chem. Soc.

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“…Recent advancements in understanding the fundamental Joule-heating characteristics of pure nanocarbon aerogels 4,25 have provided a solid basis for further investigations into Joule-heating applications involving hybrid nanoparticle-decorated nanocarbon aerogels. For instance, a pioneering study investigated the use of emulsion-templated reduced graphene oxide (rGO) aerogels to examine fundamental Joule-heating characteristics.…”

Section: Introductionmentioning

confidence: 99%

Flash Joule‐heating synthesis of MoO₂ nanocatalysts in graphene aerogel for deep catalytic oxidative desulfurization

Xia,

Li,

Huang

et al. 2024

AIChE Journal

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Ultra‐high‐temperature flash Joule‐heating of organometallic precursor‐embedded reduced graphene oxide (rGO) aerogel represents a highly efficient approach for the ultrafast production of nanocatalysts, while such a methodology has been scarcely applied to 3D nanocarbon‐based aerogel monoliths. Herein, we demonstrate the rapid synthesis of MoO2 nanoparticles within the aerogel matrix via a 1‐s high‐temperature flash Joule‐heating process (~1700°C), resulting in the formation of the hybrid MoO2@rGO aerogel with uniformly distributed nanoparticles. Nitrogen adsorption/desorption analysis indicates discernible internal microstructural disparities attributed to the additional 1‐s flash‐heating and the substantial generation of MoO2 nanoparticles. This aerogel exhibits exceptional catalytic functionality, achieving up to 99.8% efficiency in converting dibenzothiophene to dibenzothiophene sulfone. Density functional theory calculations provide insights into the catalytic mechanism, revealing that the Mo center shows accumulated electron density contributed from the electron‐rich graphene substrate. This electron density enhancement significantly enhances the catalytic activity, enabling deep desulfurization. The proposed flash nanocatalyst synthesis approach presented here can be extended to fabricate multimetallic nanocatalysts and high‐entropy alloys within the cylindrical aerogel entity, exhibiting great potential for applications in industry‐relevant flow chemistry, electrochemistry, industrial catalysis, and beyond.

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“…There is a paucity of research into the fabrication and investigation of the Joule-heating characteristics of nanocarbon aerogels with centimeter-scale structures. Since the discovery of the Joule-heatable graphene aerogel that can be heated up to 200 °C, at an ultralow voltage of 1 V, with a fast-heating capability of 10 K·s –1 , similar approaches have been adopted in the study of other types of nanocarbon aerogels (e.g., carbon nanotube aerogel, rGO aerogel), resulting in improved heating efficiencies and faster heating kinetics. , Studies on the structure–property relationships of Joule-heatable nanocarbon aerogels showed that high thermal conductivity led to lower Joule-heating efficiency . Interestingly, nanocarbon aerogels loaded with functional inorganic nanoparticles exhibited no detrimental impacts on the Joule-heating performances .…”

Section: Introductionmentioning

confidence: 99%

Density-Induced Joule-Heating Characteristics of Nanocarbon Aerogels: Implications for Tunable Electrothermal Behaviors

Xia

Shen

et al. 2023

ACS Appl. Nano Mater.

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An in-depth understanding of the electrothermal characteristics and behaviors of nanocarbon aerogels is crucial for optimizing their Joule-heating performance and expanding their applications. Modifying a single parameter of nanocarbon aerogels can reveal potential variations in Joule heating, which makes it a valuable area for investigation. This study explores reduced graphene oxide aerogels and reduced graphitized nanofiber aerogels with varying densities (14.9–31.7 mg·cm–3), fabricated using the hydrothermal method and polymer-assisted cross-linking method, to elucidate density-induced Joule-heating discrepancies. The critical step in aerogel preparation is the freeze-drying process, which yields structurally intact nanocarbon aerogels for Joule-heating experiments. Aerogels with higher densities displayed enhanced electrical and thermal conductivities (up to 24.9 S·m–1 and 0.882 W·m–1·K–1, respectively) compared to their lower-density counterparts, owing to the increased number of pathways available for electron/phonon transportation. The low-density aerogels exhibited more pronounced features in the heating temperature range (up to 117 °C) and efficiency (up to 46.5 °C·W–1), making them more suitable for energy-efficient applications. Despite variations in the density, all of the fabricated aerogels showed efficient electron hopping between the interconnected nanocarbons, which enabled uniform resistive heating throughout the aerogel entity. This work highlighted the importance of density control in altering the Joule-heating performance of nanocarbon aerogels for specific applications, which has far-reaching implications for optimizing the properties of other electrically conducting aerogel materials.

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Understanding the Joule-heating behaviours of electrically-heatable carbon-nanotube aerogels

Abstract: Electrically-heatable carbon-nanotube aerogels under Joule-heating using the side–side arrangement and the top–bottom arrangement displaying significantly different heating behaviours.

Cited by 7 publications

References 37 publications

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

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

Flash Joule‐heating synthesis of MoO₂ nanocatalysts in graphene aerogel for deep catalytic oxidative desulfurization

Density-Induced Joule-Heating Characteristics of Nanocarbon Aerogels: Implications for Tunable Electrothermal Behaviors

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Understanding the Joule-heating behaviours of electrically-heatable carbon-nanotube aerogels

Abstract: Electrically-heatable carbon-nanotube aerogels under Joule-heating using the side–side arrangement and the top–bottom arrangement displaying significantly different heating behaviours.

Cited by 7 publications

References 37 publications

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

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

Flash Joule‐heating synthesis of MoO2 nanocatalysts in graphene aerogel for deep catalytic oxidative desulfurization

Density-Induced Joule-Heating Characteristics of Nanocarbon Aerogels: Implications for Tunable Electrothermal Behaviors

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Flash Joule‐heating synthesis of MoO₂ nanocatalysts in graphene aerogel for deep catalytic oxidative desulfurization