Dimensionality effects of carbon-based thermal additives for microporous adsorbents

作者：Yang Sungwoo; Kim Hyunho; Narayanan Shankar; McKay Ian S; Wang Evelyn N^*

来源：Materials and Design, 2015, 85: 520-526.

DOI：10.1016/j.matdes.2015.06.166

• Thermal conductivity
• Microporous adsorbent
• Zeolite
• Metal organic frameworks
• Graphene
• Graphene oxide
• Carbon nanotube

We present a systematic study of carbon nanomaterials with different geometries and thermal properties, including few-layer graphene (FLG), graphene oxide (GO), and functionalized carbon nanotubes (fCNIT) as additives to enhance the thermal conductivity of microporous adsorbent materials. The dimensionality and intrinsic thermal conductivity of the additives were found to be critical for both maximizing the thermal conductivity enhancement, and minimizing the reduction in the adsorption capacity of the active materials. We demonstrated that two-dimensional (2D) FLG was the most effective thermal additive for zeolite (ZT) adsorbents due to its high thermal conductivity and preferential 2D geometry. Meanwhile, negligible enhancement was observed from one-dimensional (1D) additives such as fCf\ffs, which is consistent with the predictions from a modified effective medium analysis (EMA). Our work provides insights for the development of additives to enhance the thermal performance of porous materials in applications such as adsorption heat pumps, gas storage, and separation processes.

• 出版日期2015-11-15