Kemp K Christian, Baek Seung Bin, Lee Wang-Geun, Meyyappan M, Kim Kwang S
Department of Chemistry, School of Natural Science, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 689-798, Korea. NASA Ames Research Center, Moffett Field, CA 94035, USA.
Nanotechnology. 2015 Sep 25;26(38):385602. doi: 10.1088/0957-4484/26/38/385602. Epub 2015 Sep 2.
An activated carbon material derived from waste coffee grounds is shown to be an effective and stable medium for methane storage. The sample activated at 900 °C displays a surface area of 1040.3 m(2) g(-1) and a micropore volume of 0.574 cm(3) g(-1) and exhibits a stable CH4 adsorption capacity of ∼4.2 mmol g(-1) at 3.0 MPa and a temperature range of 298 ± 10 K. The same material exhibits an impressive hydrogen storage capacity of 1.75 wt% as well at 77 K and 100 kPa. Here, we also propose a mechanism for the formation of activated carbon from spent coffee grounds. At low temperatures, the material has two distinct types with low and high surface areas; however, activation at elevated temperatures drives off the low surface area carbon, leaving behind the porous high surface area activated carbon.
由废弃咖啡渣衍生的活性炭材料被证明是一种有效且稳定的甲烷储存介质。在900℃下活化的样品表面积为1040.3 m² g⁻¹，微孔体积为0.574 cm³ g⁻¹，在3.0 MPa和298 ± 10 K的温度范围内表现出约4.2 mmol g⁻¹的稳定CH₄吸附容量。同样的材料在77 K和100 kPa下也表现出令人印象深刻的1.75 wt%的储氢容量。在此，我们还提出了一种由废弃咖啡渣形成活性炭的机制。在低温下，该材料有两种不同类型，表面积低和高；然而，在高温下活化会驱除掉低表面积碳，留下多孔的高表面积活性炭。
