Preparation of Nanoporous Carbon from Rice Husk with Improved Textural Characteristics for Hydrogen Sorption
Lesbayev B. Rakhymzhan N. Ustayeva G. Maral Y. Atamanov M. Auyelkhankyzy M. Zhamash A.
February 2024Multidisciplinary Digital Publishing Institute (MDPI)
Journal of Composites Science
2024#8Issue 2
This study proposes a method to control the pore-forming process by performing preliminary mechanical activation of the initial rice husk before carbonization. Preliminary mechanical activation of the initial rice husk leads to the loosening of the intercellular substance and its partial depolymerization, thereby increasing the availability of its internal structure for pore formation during carbonization and chemical activation. Using the method described above, nanoporous carbon was obtained with a Brunauer–Emmett–Teller (BET)-calculated specific surface area of 2713 m2/g, a micropore specific surface area calculated by using the Dubinina–Radushkevich (D-R) method of 3099 m2/g, and a total pore volume calculated by using the Barett–Joyner–Halenda (BJH) method of 1.625 cm3/g. Due to these characteristics, the adsorption capacity in the obtained sample was for hydrogen 3.7 wt.% at a temperature of −190 °C and a pressure of 9 kgf/cm2, which is 29.7% higher than the adsorption capacity of nanoporous carbon obtained based on rice husk without mechanical activation. The composite “carbon–platinum” NC-2/Pt10%, at a temperature of 20 °C and a pressure of 9 kgf/cm2, showed an increase in sorption capacity of 27% compared to pure nanoporous carbon NC-2, which is explained by the emergence of the spillover effect.
adsorption , carbon , hydrogen storage , mechano-activation , nanoporous , spillover effect
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Faculty of Chemistry and Chemical Technology, al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Institute of Combustion Problems, 172 Bogenbay Batyr Str., Almaty, 050012, Kazakhstan
Faculty of Chemistry and Chemical Technology
Institute of Combustion Problems
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