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dc.contributor.authorBo, Zheng
dc.contributor.authorYi, Kexin
dc.contributor.authorYang, Huachao
dc.contributor.authorGuo, Xinzheng
dc.contributor.authorHuang, Zhesong
dc.contributor.authorZheng, Zhouwei
dc.contributor.authorYan, Jianhua
dc.contributor.authorCen, Kefa
dc.contributor.authorOstrikov, Kostya Ken
dc.date.accessioned2021-04-22T23:49:53Z
dc.date.available2021-04-22T23:49:53Z
dc.date.issued2021
dc.identifier.issn0378-7753
dc.identifier.doi10.1016/j.jpowsour.2021.229639
dc.identifier.urihttp://hdl.handle.net/10072/403920
dc.description.abstractEver-increasing mass loading of transition metal oxides (TMOs) yields high pseudocapacitance in laboratory electrochemical capacitors. However, their performance based on whole electrode mass is still far from industry standards. Highly-promising solution based on loading TMOs into 3D porous electrodes causes a yet unresolved challenge to find ways to achieve ultimate energy storage by atomically precisely loading less active material. Inspired by single-atom catalysis, we propose a new “more from less but precise” concept of homogeneously dispersing a common MnO2 TMO via atomic sites to maximize atom redox reaction efficiency for industry-relevant pseudocapacitance. The concept is materialized by multifunctional MXene aerogel with super-hydrophilicity and surface functional groups, which provides 3D atomic nucleation sites to homogeneously load in-situ-formed, covalently-bonded MnO2 nanosheets. The gravimetric capacitance of MnO2 is largely enhanced, yielding superior pseudocapacitance of >400 F/g at > 5 mg/cm2 that is typically achieved at 10 times lower loadings. Outstanding electrode areal capacitance is achieved using 2–3 times less MnO2 mass, demonstrating industry-relevant pseudocapacitance almost twice higher than in state-of-the-art devices. MnO2/MXene//MXene asymmetric supercapacitor shows practically-high energy (~50.1 Wh/kg) and power (~10.0 kW/kg) densities, among the best MnO2 pseudocapacitors. Capacitive-mechanism-controlled redox reactions, rarely achievable in diffusion-controlled porous pseudocapacitive electrodes, are revealed.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherElsevier
dc.relation.ispartofpagefrom229639
dc.relation.ispartofjournalJournal of Power Sources
dc.relation.ispartofvolume492
dc.subject.fieldofresearchChemical Sciences
dc.subject.fieldofresearchEngineering
dc.subject.fieldofresearchcode03
dc.subject.fieldofresearchcode09
dc.subject.keywordsScience & Technology
dc.subject.keywordsPhysical Sciences
dc.subject.keywordsChemistry, Physical
dc.subject.keywordsElectrochemistry
dc.titleMore from Less but Precise: Industry-relevant Pseudocapacitance by Atomically-precise Mass-loading MnO2 within Multifunctional MXene Aerogel
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationBo, Z; Yi, K; Yang, H; Guo, X; Huang, Z; Zheng, Z; Yan, J; Cen, K; Ostrikov, KK, More from Less but Precise: Industry-relevant Pseudocapacitance by Atomically-precise Mass-loading MnO2 within Multifunctional MXene Aerogel, Journal of Power Sources, 2021, 492, pp. 229639
dc.date.updated2021-04-22T23:48:14Z
gro.hasfulltextNo Full Text
gro.griffith.authorOstrikov, Kostya (Ken)


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