期刊
NANOTECHNOLOGY
卷 26, 期 38, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/26/38/385602
关键词
adsorption; activated carbon; methane storage; energy storage; mechanism; hydrogen storage
资金
- NRF [2010-0020414]
- National Research Foundation of Korea [2010-0020414] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 degrees 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 similar to 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.
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