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Volume 30
Issue 3
10.3390/molecules30030632
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Impact of Activation Conditions on the Electrochemical Performance of Rice Straw Biochar for Supercapacitor Electrodes

by
Jialuo Cheng
1,2,
Yumeng Lu
3,
Ya Sun
1,*,
Sunhua Deng
4,
Heng Yang
1,
Manman Zhang
1,
Chunlei Wang
1 and
Juntao Yan
1,*
1
College of Chemistry and Environmental Engineering, Key Laboratory of Agricultural Waste Resource Utilization in Hubei Province, Wuhan Polytechnic University, Wuhan 430023, China
2
Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
3
School of Nursing and Health Management, Wuhan Donghu University, Wuhan 430212, China
4
College of Construction Engineering, Jilin University, Changchun 130021, China
*
Authors to whom correspondence should be addressed.
Molecules 2025, 30(3), 632; https://doi.org/10.3390/molecules30030632 (registering DOI)
Submission received: 1 January 2025 / Revised: 27 January 2025 / Accepted: 30 January 2025 / Published: 31 January 2025
Versions Notes

Abstract

Biochar, derived from agricultural waste, has gained significant attention as a sustainable material for energy storage applications due to its high surface area, tunable porosity, and environmental benefits. This study investigates the electrochemical performance of rice straw biochar (RSBC) as an electrode material, with a focus on the effects of activation temperature, activation ratio, and activation time. Among the prepared samples, RSBC-2, activated at 800 °C with a 1:2 KOH ratio for 0.5 h, exhibited the best electrochemical performance. Characterization of RSBC and RSBC-2 showed significant improvements in surface area and pore structure. Specifically, the BET surface area of RSBC-2 increased to 939.40 m² g⁻1, with a reduced average pore size of 2.27 nm. Electrochemical testing revealed that RSBC-2 achieved specific capacitances of 296, 281, 272, 260, and 240 F g⁻1 at current densities of 0.2, 0.5, 1, 2, and 5 A g⁻1, respectively, with a capacity retention rate of 81%. The improved electrochemical performance of RSBC-2 is attributed to its larger surface area and enhanced pore structure, which facilitate better charge storage and overall electrochemical behavior, making it a promising candidate for energy storage applications.
Keywords: rice straw biochar; activation; electrodes; supercapacitor rice straw biochar; activation; electrodes; supercapacitor

Share and Cite

MDPI and ACS Style

Cheng, J.; Lu, Y.; Sun, Y.; Deng, S.; Yang, H.; Zhang, M.; Wang, C.; Yan, J. Impact of Activation Conditions on the Electrochemical Performance of Rice Straw Biochar for Supercapacitor Electrodes. Molecules 2025, 30, 632. https://doi.org/10.3390/molecules30030632

AMA Style

Cheng J, Lu Y, Sun Y, Deng S, Yang H, Zhang M, Wang C, Yan J. Impact of Activation Conditions on the Electrochemical Performance of Rice Straw Biochar for Supercapacitor Electrodes. Molecules. 2025; 30(3):632. https://doi.org/10.3390/molecules30030632

Chicago/Turabian Style

Cheng, Jialuo, Yumeng Lu, Ya Sun, Sunhua Deng, Heng Yang, Manman Zhang, Chunlei Wang, and Juntao Yan. 2025. "Impact of Activation Conditions on the Electrochemical Performance of Rice Straw Biochar for Supercapacitor Electrodes" Molecules 30, no. 3: 632. https://doi.org/10.3390/molecules30030632

APA Style

Cheng, J., Lu, Y., Sun, Y., Deng, S., Yang, H., Zhang, M., Wang, C., & Yan, J. (2025). Impact of Activation Conditions on the Electrochemical Performance of Rice Straw Biochar for Supercapacitor Electrodes. Molecules, 30(3), 632. https://doi.org/10.3390/molecules30030632

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