Environmentally Friendly Synthesis of Hierarchical Porous Activated Carbon From Biomass Waste for Enhanced Supercapacitor Performance and Measured by Voltage Holding Method

Authors

  • T. E Amakoromo Department of Physics/Electronics Technology, University of Port Harcourt, Rivers State, Nigeria https://orcid.org/0000-0003-1245-9786
  • P. S. Cookey Department of Physics/Electronics Technology, Federal Polytechnic of Oil and Gas, Bonny, Rivers State, Nigeria.

DOI:

https://doi.org/10.54536/ajise.v5i1.7264

Keywords:

Biomass, Stability Charge Storage, Super Capacitor, Voltage-Holding Method

Abstract

Supercapacitors remain highly efficient energy storage devices, which rely on electrochemical processes, however, stability over extended periods remains a major concern. In this study, the performance of a biomass-derived device is tested using the voltage holding method. The device exhibited a specific capacitance of 55Fg-1 at 0.5Ag-1 and a maximum energy density of 8.14Whkg-1  at 250Wkg-1 power density. Consequently, a 10h floating period was followed by consecutive constant current charge discharge (CCCD) cycles to identify any capacitance loss over a 72 h (3days) period. It was observed that within the first 50 h, there was no noticeable loss in capacitance which shows high stability at the set voltage of 1.6V and time window. However, beyond 50 hours of exposure and running up to 72 h, a capacitance loss of 44% was observed. This voltage holding method tells the true story of the stability patterns of supercapacitors as it gives insight via an aggressive aging process.

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References

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Published

2026-04-20

How to Cite

Amakoromo, T. E. ., & Cookey, P. S. . (2026). Environmentally Friendly Synthesis of Hierarchical Porous Activated Carbon From Biomass Waste for Enhanced Supercapacitor Performance and Measured by Voltage Holding Method. American Journal of Innovation in Science and Engineering , 5(1), 120-127. https://doi.org/10.54536/ajise.v5i1.7264

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