Electrolyte ions-matching hierarchically porous biochar electrodes with an extended potential window for next-generation supercapacitors

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dc.contributor.authorRaju, Ganji Seeta Rama
dc.contributor.authorKondrat, Svyatoslav
dc.contributor.authorChodankar, Nilesh R.
dc.contributor.authorHwang, Seung-Kyu
dc.contributor.authorLee, Jeong Han
dc.contributor.authorLong, Teng
dc.contributor.authorPavitra, Eluri
dc.contributor.authorPatil, Swati J.
dc.contributor.authorKugalur Shanmugam, Ranjith
dc.contributor.authorBasaveswara Rao, M. V.
dc.contributor.authorWu, Peng
dc.contributor.authorRoh, Kwang Chul
dc.contributor.authorHuh, Yun Suk
dc.contributor.authorHan, Young-Kyu
dc.contributor.organizationDepartment of Energy and Materials Engineering, Dongguk University-Seoul, Seoul, Republic of Korea
dc.contributor.organizationInstitute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland
dc.contributor.organizationInstitute for Computational Physics, University of Stuttgart, Stuttgart, Germany
dc.contributor.organizationMechanical Engineering Department, Khalifa University, Abu Dhabi, United Arab Emirates
dc.contributor.organizationDepartment of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, Incheon, , Republic of Korea
dc.contributor.organizationEnergy & Environmental Division, Korea Institute of Ceramic Engineering & Technology, 101, Soho-ro, Jinju-si, Gyeongsangnam-do, Republic of Korea
dc.contributor.organizationDepartment of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, China
dc.contributor.organizationDapartment of Chemistry, Krishna University, Machilipatnam, Andhra Pradesh, India
dc.contributor.organizationCollege of Energy and Power Engineering, and Ministry of Education, Inner Mongolia University of Technology, Hohhot, China
dc.date.accessioned2025-02-11T11:41:14Z
dc.date.available2025-02-11T11:41:14Z
dc.date.issued2023
dc.description.abstractEngineering high-performance carbonaceous electrode materials from earth-abundant biomass has attracted substantial attention for its applicability in next-generation supercapacitors (SCs). However, these materials exhibit low specific energy due to the dominance of mesopores and a limited potential window. To overcome these shortcomings, herein, we synthesize Miscanthus sinensis (silver grass)-derived hierarchically-porous activated carbons (SHACs) via pyrolysis, carbonization, and KOH activation. We test the SHAC electrodes with different electrolytes, showing how an electrolyte–electrode pair can be tuned to boost energy and power densities. Owing to the synergetic effect of the size-balanced proportion of micropores matched with the size of electrolyte ions, in KOH electrolyte, the SHAC electrode produces a high specific capacitance (592 F g/1) while, simultaneously, providing faster charging compared to Na2SO4 electrolyte. We rationalize these findings with molecular dynamics simulations, demonstrating the avoidance of power-density trade-off, typical for microporous SCs. Upon adding K3Fe(CN)6 redox species to KOH electrolyte (hybrid electrolyte), capacitance increases 2.53 fold (380 to 963 F g/1 at 5 A g/1) due to the synergy of capacitive and faradaic energy storage mechanisms. In the hybrid electrolyte, a SHAC electrode-embedded symmetric SC (SSC) offers a high cycling stability (97%) with 1.6 V wide operational voltage and permits energy storage and power density higher than those reported so far for aqueous electrolyte-based SSCs and asymmetric SCs. In addition, these SSCs provide long-lasting operational capabilities that are useful for driving various portable electronic devices. The obtained results demonstrate a feasible methodology to utilize the maximum available surface area of carbonaceous materials for electrochemical energy storage applications.
dc.description.sponsorshipThis work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2021R1F1A1064174, 2021R1A5A6002853 and 2022R1A2C2008968). S. K. acknowledges the financial support by NCN grant no. 2021/40/Q/ST4/00160. This work was also supported by the Technology Innovation Program (RS-2022-00156080, Development of electrical double layer capacitors for power supplement of hydrogen forklift) funded by the Ministry of Trade, Industry and Energy, and the Natural Science Foundation of Inner Mongolia (2023SHZR1182).
dc.identifier.citationJ. Mater. Chem. A, 2023, 11, 15540-15552
dc.identifier.doi10.1039/D3TA01829F
dc.identifier.issn2050-7496
dc.identifier.urihttps://open.icm.edu.pl/handle/123456789/25430
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.relation.ispartofseries11
dc.rightsUznanie autorstwa 4.0 Międzynarodoween
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceJournal of Materials Chemistry A
dc.titleElectrolyte ions-matching hierarchically porous biochar electrodes with an extended potential window for next-generation supercapacitorsen
dc.typearticle
dc.type.versionacceptedVersion
person.identifier.orcidChodankar, Nilesh R. [0000-0002-1174-2064]
person.identifier.orcidRaju, Ganji Seeta Rama [0000-0002-3170-7506]
person.identifier.orcidKondrat, Svyatoslav [0000-0003-4448-0686]
person.identifier.orcidHwang, Seung-Kyu [0000-0002-8463-5147]
person.identifier.orcidPatil, Swati J. [0000-0002-3619-2783]
person.identifier.orcidKugalur Shanmugam, Ranjith [0000-0003-3942-8672]
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