Microwave-Assisted Hydrothermal Preparation of Corn Straw Hydrochar as Supercapacitor Electrode Materials
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Abstract In this work, we propose the microwave-assisted hydrothermal activation method to synthesize supercapacitor electrode materials from corn straw under a small amount of the potassium catalyst (30 wt %), which can meet the environmental protection and low-cost requirement. With the extension of radiation time from 40 to 100 min, the pore structure of hydrochar expands from the micropore to hierarchical pore, and the microstructure evolves from an amorphous structure to graphene-like sheets. Microwave-assisted hydrothermal activation can control the synergistic development of hierarchical pore and graphene-like sheets of hydrochar under the condition of using a lesser amount of the catalyst. The as-obtained HTC-40/70/100 shows an excellent graphitization degree and the developed hierarchical pores. By comparing the electrochemical performance of the symmetrical capacitor devices composed of corn straw hydrochar and pyrochar in organic electrolytes, we have found that the hydrochar is suitable for organic system symmetric capacitance, and the pore structure and graphitization degree are closely related to the transmission of ions and electrons in the electrolyte. Therefore, HTC-100 with a high specific surface area (1781 m2/g) and highly ordered microstructure has the best electrochemical performance.
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Malghani et al. (2013) prepared corn-derived hydrochar via pyrolysis and HTC for soil amendment; addition of 1 wt.% hydrochar to soils resulted in CH4 and CO2 emissions and reduced N2O emissions; increased emissions were due to rapid decomposition of hydrochar within 100 days after addition of 50 wt.% hydrochar.
“Corn-derived hydrochar was prepared via pyrolysis and the HTC technique by Malghani et al. (2013) for soil amendment as a result of their impact on greenhouse gas emissions and carbon sequestration [114].The addition of 1 wt.% hydrochar to the soils resulted in CH 4 and CO 2 emissions and reduced N 2 O emissions.The increased emissions were due to the rapid decomposition of hydrochar within 100”
From Hydrochar: A Review on Its Production Technologies and Applications (2021) · cites this paper as [114]
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Hydrochar: A Review on Its Production Technologies and Applications
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- Authors
- Liu, D., Wang, Y., Jia, B., Wei, J., Liu, C., Zhu, J., Tang, S., Wu, Z., & Chen, G.
- Affiliations
- Jilin Agricultural University (CN)
- Corresponding author
- Wu, Zhihai
- Chen, Guang
- Venue
- ACS Omega
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-10-02
- Volume
- 5
- Issue
- 40
- Pages
- 26084-26093
- ISSN
- 2470-1343 (ISSN-L)
- PMC
- PMC7557994
- OpenAlex
- W3090554229
- Cited by
- 42
- References
- 36
- Citations by year
- 2026: 6 · 2025: 9 · 2024: 6 · 2023: 8 · 2022: 7 · 2021: 6
- FWCI
- 3.62
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- ACS Omega (publishedVersion, other-oa)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Ministry of Science and Technology of the People's Republic of China (2017YFD0300609)
- People's Government of Jilin Province
- National Natural Science Foundation of China (51806080)
- Education Department of Jilin Province (JJKH20200325KJ)
- Topics
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Supercapacitor Materials and Fabrication
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Keywords
- corn stover, hydrochar, supercapacitor electrodes, potassium catalyst, hierarchical porous structure, graphitization degree, biomass-derived carbon, pyrochar, symmetric supercapacitor, organic electrolytes, specific surface area
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