Hydrothermal synthesis of microalgae-derived microporous carbons for electrochemical capacitors
By Sevilla, M.; Gu, W.; Falco, C.; Titirici, M.M.; Fuertes, A.B. & Yushin, G.
Published in Journal of Power Sources
NULL
2014
Abstract
N-doped highly microporous carbons have been successfully fabricated from N-rich microalgae by the combination of low-cost hydrothermal carbonization and industry-adopted KOH activation processes. The hydrothermal carbonization process was found to be an essential step for the successful conversion of microalgae into a carbon material. The materials thus synthesized showed BET surface areas in the range ∼1800–2200 m2 g-1 exclusively ascribed to micropores. The carbons showed N contents in the 0.7–2.7 wt.%, owing to the use of N-rich microalgae as a carbon precursor. When tested in symmetric double layer capacitors (occasionally called supercapacitors) based on aqueous LiCl electrolytes, pseudocapacitance was only observable for the sample synthesized at the lowest temperature, 650 °C, which is the one exhibiting the largest amount of N- and O-containing groups. The samples synthesized at 700–750 °C exhibited excellent rate capability (only 20% of capacitance loose at 20 A g-1), with specific capacitances of 170–200 F g-1 at 0.1 A g-1. These materials showed excellent long-term cycling stability under high current densities.
Microsoft is Ending Support for Windows 7
Microsoft will discontinue support for Windows 7 on January 14, 2020 which means Gamry will also be discontinuing support for Windows 7. If you are upgrading to Windows 10, like many companies and institutions, you need to be running Version 7 of our s oftware . Please note that only USB and Ethernet-based instruments can run in Version 7. Eligible users can download the latest version of our software through our online Client Portal .
If you haven't already registered your instrument, you can do so through the Client Portal .
Please email Technical Support if you have any questions regarding this transition. Please be sure to include your instrument model and serial number when contacting us.