2024, Vol.34, No.7

Carbon Letters 2023 KCI Impact Factor : 1.35 KCI-WoS Impact Factor : 6.04

pISSN : 1976-4251 / eISSN : 2233-4998
https://journal.kci.go.kr/carbon

Graphene shows unique electron-transport properties owing to the density of its carriers near the Dirac point. The quantum capacitance (CQ) of graphene is an intrinsic property that has been investigated theoretically in many previous studies. However, the development of CQ theory is hindered by the limited availability of related experimental works. In this perspective, experimental works on the CQ of mechanically exfoliated graphene, graphene synthesized by chemical vapor deposition (CVD), and graphene mesosponge are briefly summarized. The impact of structural properties such as stacking layers, defects, and nitrogen doping on CQ was experimentally investigated. Furthermore, the applicability of CQ theory was extended to three-dimensional graphene frameworks. Future research on CVD-synthesized and three-dimensional graphene is expected to enhance our comprehension of the underlying nature of CQ.

Volatile organic compounds (VOCs) are commonly produced in the combustion of fossil fuels and in chemical industries such as detergents and paints. VOCs in atmosphere cause different degrees of harm to human bodies and environments. Adsorption has become one of the most concerned methods to remove VOCs in atmosphere due to its high efficiency, simple operation and low energy consumption. Biomass-based porous carbon (BPC) has been considered as the most promising adsorption material because of the low cost and high absorption rate. In this paper, the key characteristic (e.g., specific surface area, pore structure, surface functional groups and basic composition) of BPC affecting the adsorption of VOCs in atmosphere were analyzed. The improvement of adsorption capacity of BPC by common modification methods, such as surface oxidation, surface reduction, surface loading and other modification methods, were discussed. Examples of BPC adsorption on different types of VOCs including aldehydes, ketones, aromatic VOCs, and halogenated hydrocarbons, were also reviewed. The specific adsorption mechanism was discussed. Finally, some unsolved problems and future research directions about BPC for adsorbing VOCs were propounded. This review can serve as a valuable reference for future developing effective biomass-based porous carbon VOCs adsorption technology.

Efforts have been extensively undertaken to tackle overheating problems in advanced electronic devices characterized by high performance and integration levels. Thermal interface materials (TIMs) play a crucial role in connecting heat sources to heat sinks, facilitating efficient heat dissipation and thermal management. On the other hand, increasing the content of TIMs for high thermal conductivity often poses challenges such as poor dispersion and undesired heat flow pathways. This study aims to enhance the through-plane heat dissipation via the magnetic alignment of a hybrid filler system consisting of exfoliated graphite (EG) and boron nitride (BN). The EG acts as a distributed scaffold in the polymer matrix, while the BN component of the hybrid offers high thermal conductivity. Moreover, the magnetic alignment technique promotes unidirectional heat transfer pathways. The hybrid exhibited an impressive thermal conductivity of 1.44 W m−1 K−1 at filler contents of 30 wt. %, offering improved thermal management for advanced electronic devices.