Graphene Aerogels: Structure Control, Thermal Characterization and Thermal Transport
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Graphene Aerogels: Structure Control, Thermal Characterization and Thermal Transport Qin Wang1 · Liping Xiang1 · Di Mei1 · Yangsu Xie1 Received: 26 August 2020 / Accepted: 10 September 2020 / Published online: 22 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Graphene aerogel (GA) as one of the innovative carbon nanostructured materials is superior with flexibility, strong mechanical strength, lightweight, high porosity and excellent durability, which attracted wide research interests and fulfill the requirements for various novel applications in energy conversion and storage, sensor, thermal management, and environment areas, etc. The thermal property among other important properties of GA is important for its novel applications. In this work, we first introduce the synthesis and microstructure control method for GA, including pore size control, anisotropic pore structure control, and heterostructure control. The methods for measuring the thermal conductivity of bulk GAs in air (apparent k) and the k of solid matrix of GAs are introduced in detail, respectively. Finally, we review the thermal transport models for GAs, including the air–solid coupling models, models for calculating the intrinsic thermal properties of graphene nanoflakes, as well as the thermal reffusivity model and dominating thermal contact resistance model. Challenges and opportunities in the study of thermal transport in 3D GAs are discussed. Considering the remarkable complexity of physical/chemical structure of GAs, there is still a large room in understanding fundamentals of energy transport in these three-dimensional graphene networks, which will pave the way toward their novel applications in the near future. Keywords Graphene aerogel · Micro-structure control · Thermal characterization · Thermal transport models
Qin Wang and Liping Xiang contributed equally to this work. * Yangsu Xie [email protected] 1
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, Guangdong, People’s Republic of China
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International Journal of Thermophysics (2020) 41:155
1 Introduction In recent years, stimulated by the increasing demands of novel applications, different innovative carbon nanostructured materials have been synthesized and extensively studied [1–3]. Three dimensional graphene aerogel (GA) is superior with flexible shape, strong mechanical strength, lightweight, high porosity and excellent durability. Extensive work has been done for the applications of GA in electrochemical devices [4, 5], pollution treatment [6–9], energy conversion [10], sensors [3], and energy storage [11], etc. The thermal property among other important properties of GA becomes increasingly important for their applications [12–17]. Thermal conductivity (k) and diffusivity (α) of GA depend on their inner micro-structures, which includes the porosity, chemical doping, structural domain size, defects densities, and strength of interconnection among
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