Hemp-Derived Hierarchical Porous Carbon with an Optimized Pore Structure by NaOH Activation for Supercapacitor Applications
2
Issued Date
2025-11-11
Resource Type
eISSN
24701343
Scopus ID
2-s2.0-105021240908
Journal Title
ACS Omega
Volume
10
Issue
44
Start Page
53596
End Page
53611
Rights Holder(s)
SCOPUS
Bibliographic Citation
ACS Omega Vol.10 No.44 (2025) , 53596-53611
Suggested Citation
Bowornthommatadsana K., Klangvijit K., Uwanno T., Phonyiem Reilly M., Yordsri V., Chaiwat W., Ichikawa S., Obata M., Fujishige M., Takeuchi K., Wongwiriyapan W., Endo M. Hemp-Derived Hierarchical Porous Carbon with an Optimized Pore Structure by NaOH Activation for Supercapacitor Applications. ACS Omega Vol.10 No.44 (2025) , 53596-53611. 53611. doi:10.1021/acsomega.5c10175 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/113094
Title
Hemp-Derived Hierarchical Porous Carbon with an Optimized Pore Structure by NaOH Activation for Supercapacitor Applications
Corresponding Author(s)
Other Contributor(s)
Abstract
This study focuses on converting hemp hurd, a byproduct of hemp stalk processing, into high-performance activated carbon for supercapacitor applications. Hemp hurd was pyrolyzed and subsequently activated with NaOH at various ratios (biochar:NaOH = 1:1, 1:2, 1:3, 1:4). The Hurd-4 condition (1:4 ratio) yielded the highest specific surface area, 3033 m<sup>2</sup>/g. Our findings indicate that increasing the chemical activation ratio enhances the mesopore-to-micropore volume ratio (V<inf>meso</inf>/V<inf>micro</inf>) to 1.58 while maintaining a sufficient micropore volume for ion storage. This balanced pore structure effectively increased the specific capacitance, achieving a maximum of 725 F/g at a current density of 0.3 A/g in a 1 M H<inf>2</inf>SO<inf>4</inf>electrolyte. When assembled into a coin cell with an organic electrolyte, Hurd-4 exhibited a maximum specific capacitance of 39 F/g, a maximum energy density of 34 Wh/kg, and a power density of 395 W/kg, surpassing commercial activated carbon. Additionally, the device maintained 78% capacitance retention after 10,000 cycles at a current density of 0.5 A/g. The superior electrochemical properties are attributed to the largest specific surface area, highest pore volume, and optimal mesopore volume ratio. These results demonstrate the potential of hemp hurd as a highly efficient precursor for synthesizing activated carbon for high-performance supercapacitors.