Process for preparing high surface area carbon
First Claim
1. A process for the preparation of high surface area activated carbon from coconut shell, which comprises cleaning the coconut shells, drying the cleaned coconut shells, crushing the dried coconut shells, sieving the crushed coconut shell through 100-400 mesh to obtain uniform sized coconut shell powder, treating the shell powder with an activating agent, drying the treated coconut shell powder, carbonizing the powder in an inert atmosphere, cooling the activated carbon to the room temperature, removing the excess of activating agent by treating, washing with water bring the powder to neutral pH and drying the activated carbon to obtain the activated carbon.
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Abstract
The present invention provides a process for making activated carbon having BET surface area upto 2000 m2/g with pore diameter in the range 17-21 Å suitable for fabricating fuel cell and ultracapacitor electrode from coconut shell by treating carbon granules obtained from coconut shells with chemical activating agents like zinc chloride or potassium hydroxide at the room temperature range 500-800° C. in a dynamic flow of gases like N2 or CO2 for 6-24 h followed by a specific cooling pattern to room temperature. Use of such activated carbon enables the fabrication of high performance ultracapacitor electrodes in H2SO4 as exemplified by capacitance values like 180 F/g without the use of any normal metal additives such as RuO2 or IrO2.
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13 Claims
- 1. A process for the preparation of high surface area activated carbon from coconut shell, which comprises cleaning the coconut shells, drying the cleaned coconut shells, crushing the dried coconut shells, sieving the crushed coconut shell through 100-400 mesh to obtain uniform sized coconut shell powder, treating the shell powder with an activating agent, drying the treated coconut shell powder, carbonizing the powder in an inert atmosphere, cooling the activated carbon to the room temperature, removing the excess of activating agent by treating, washing with water bring the powder to neutral pH and drying the activated carbon to obtain the activated carbon.
Specification