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Today, the world’s climate change is a growing problem, plant carbon sequestration is one of the effective ways to mitigate climate change by reducing greenhouse gases, mostly carbon gases.  Dicranopteris linearis  ( D. linearis ), a common fern species in the tropic or subtropic ecoregions, has been recently recognized as a potential feedstock to produce highly porous biochar. This study aims to enhance the specific surface area (SSA) and pore volumes of biochars derived from the  D. linearis  by H 3 PO 4  activation and examine electrical properties of the activated biochars and their possible usage for the electric double-layer capacitor (EDLC) electrode. The treated raw fern was activated with H 3 PO 4  85% by the three different mixing ratios 1:0, 1:1, and 1:3 (w/w) and then pyrolysis under N 2  flow maintained at 500 °C for 1 h. The performance as the electrode for an EDLC was evaluated in 1 mol L −1  H 2 SO 4  solution for the H 3 PO 4 -activated samples. The SSA and pore volumes were drastically increased after activation. The maximum SSA and pore volume were 1212 m 2  g −1  and 1.43 cm 3  g −1 , respectively for the biochar activated at 400 °C with a weight mixing ratio 1:3 (w/w) between the fern and H 3 PO 4  acid while these values of the biochar at 400 °C were 12 m 2  g −1  and 0.02 cm 3  g −1 , respectively. The biochar activated at 600 °C with the mixing ratio 1:1 (w/w) showed the maximum capacitance value,  ca . 108 F g −1  at 1 mV s −1 . The activation using H 3 PO 4  showed a positive tendency to enhance electrochemical properties and it could be a premise toward a higher performance of EDLC from the  D. linearis  derived activated biochar.

Carbonization and H3PO4 activation of fern Dicranopteris linearis and electrochemical properties for electric double layer capacitor electrode