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Facile Synthesis of Templated Activated Carbon from Cellulose Nanofibers and MgO Nanoparticles via Integrated Carbonization-activation Method as an Eco-friendly Supercapacitor (Supporting Information)

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posted on 04.07.2022, 00:02 authored by Mark Adam FERRY, Jun MARUYAMA, Taka-Aki ASOH, Hiroshi UYAMA

A green, rapid, and facile synthesis method of activated carbon was developed and optimized using 50 nm MgO nanoparticle (NP)-based pore templating in tandem with an integrated drying and carbonization-activation heat treatment. TEMPO-oxidized cellulose nanofibers (TOCN) were mixed with MgO NPs and KOH, freeze-dried, heat treated first at 350 °C then at 800 °C to get templated activated carbon. Selective pore formation by MgO and KOH resulting in the development of mesopores and micropores, respectively was confirmed. NP-based templating is confirmed to be viable even with continuous heat treatment, and does not affect any transformations during each heat treatment phase. Through optimization for the highest surface area and optimal hierarchical porosity, templated activated carbon had a high specific capacitance of 269 F g−1 at 0.5 A g−1 with 95.92 % cycle stability after 2000 charge-discharge cycles at 10 A g−1.

Funding

Development of one-dimensional swelling/shrinking material

Japan Society for the Promotion of Science

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Japan Science and Technology Agency

Nippon Sheet Glass Foundation for Materials Science and Engineering

History

Corresponding author email address

maruyama@omtri.or.jp

Copyright

© 2022 The Author(s).