dc.contributor.author | Bo, Zheng | |
dc.contributor.author | Yi, Kexin | |
dc.contributor.author | Yang, Huachao | |
dc.contributor.author | Guo, Xinzheng | |
dc.contributor.author | Huang, Zhesong | |
dc.contributor.author | Zheng, Zhouwei | |
dc.contributor.author | Yan, Jianhua | |
dc.contributor.author | Cen, Kefa | |
dc.contributor.author | Ostrikov, Kostya Ken | |
dc.date.accessioned | 2021-04-22T23:49:53Z | |
dc.date.available | 2021-04-22T23:49:53Z | |
dc.date.issued | 2021 | |
dc.identifier.issn | 0378-7753 | |
dc.identifier.doi | 10.1016/j.jpowsour.2021.229639 | |
dc.identifier.uri | http://hdl.handle.net/10072/403920 | |
dc.description.abstract | Ever-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.peerreviewed | Yes | |
dc.language | English | |
dc.publisher | Elsevier | |
dc.relation.ispartofpagefrom | 229639 | |
dc.relation.ispartofjournal | Journal of Power Sources | |
dc.relation.ispartofvolume | 492 | |
dc.subject.fieldofresearch | Chemical sciences | |
dc.subject.fieldofresearch | Engineering | |
dc.subject.fieldofresearchcode | 34 | |
dc.subject.fieldofresearchcode | 40 | |
dc.subject.keywords | Science & Technology | |
dc.subject.keywords | Physical Sciences | |
dc.subject.keywords | Chemistry, Physical | |
dc.subject.keywords | Electrochemistry | |
dc.title | More from Less but Precise: Industry-relevant Pseudocapacitance by Atomically-precise Mass-loading MnO2 within Multifunctional MXene Aerogel | |
dc.type | Journal article | |
dc.type.description | C1 - Articles | |
dcterms.bibliographicCitation | Bo, 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.updated | 2021-04-22T23:48:14Z | |
gro.hasfulltext | No Full Text | |
gro.griffith.author | Ostrikov, Ken | |