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Delekta, S. S., Laurila, M.-M. -., Mäntysalo, M. & Li, J. (2020). Drying-Mediated Self-Assembly of Graphene for Inkjet Printing of High-Rate Micro-supercapacitors. Nano-Micro Letters, 12(1), Article ID 40.
Open this publication in new window or tab >>Drying-Mediated Self-Assembly of Graphene for Inkjet Printing of High-Rate Micro-supercapacitors
2020 (English)In: Nano-Micro Letters, ISSN 2311-6706, Vol. 12, no 1, article id 40Article in journal (Refereed) Published
Abstract [en]

Scalable fabrication of high-rate micro-supercapacitors (MSCs) is highly desired for on-chip integration of energy storage components. By virtue of the special self-assembly behavior of 2D materials during drying thin films of their liquid dispersion, a new inkjet printing technique of passivated graphene micro-flakes is developed to directly print MSCs with 3D networked porous microstructure. The presence of macroscale through-thickness pores provides fast ion transport pathways and improves the rate capability of the devices even with solid-state electrolytes. During multiple-pass printing, the porous microstructure effectively absorbs the successively printed inks, allowing full printing of 3D structured MSCs comprising multiple vertically stacked cycles of current collectors, electrodes, and sold-state electrolytes. The all-solid-state heterogeneous 3D MSCs exhibit excellent vertical scalability and high areal energy density and power density, evidently outperforming the MSCs fabricated through general printing techniques.[Figure not available: see fulltext.].

Place, publisher, year, edition, pages
Springer, 2020
Keywords
3D micro-supercapacitor, Drying-mediated self-assembly, Graphene, High-rate micro-supercapacitor, Inkjet printing, Drying, Films, Flowcharting, Ink jet printing, Microstructure, Solid electrolytes, Supercapacitor, Energy storage components, Liquid dispersions, Micro supercapacitors, On-chip integration, Porous microstructure, Self-assembly behaviors, Solid-state electrolyte, Vertical scalabilities, Self assembly
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-267988 (URN)10.1007/s40820-020-0368-8 (DOI)000514306100001 ()2-s2.0-85078323980 (Scopus ID)
Note

QC 20200330

Available from: 2020-03-30 Created: 2020-03-30 Last updated: 2020-03-30
Delekta, S. S., Laurila, M.-M., Mantysalo, M. & Li, J. (2020). Drying-Mediated Self-Assembly of Graphene for Inkjet Printing of High-Rate Micro-supercapacitors. NANO-MICRO LETTERS, 12(1), Article ID 40.
Open this publication in new window or tab >>Drying-Mediated Self-Assembly of Graphene for Inkjet Printing of High-Rate Micro-supercapacitors
2020 (English)In: NANO-MICRO LETTERS, ISSN 2311-6706, Vol. 12, no 1, article id 40Article in journal (Refereed) Published
Abstract [en]

Scalable fabrication of high-rate micro-supercapacitors (MSCs) is highly desired for on-chip integration of energy storage components. By virtue of the special self-assembly behavior of 2D materials during drying thin films of their liquid dispersion, a new inkjet printing technique of passivated graphene micro-flakes is developed to directly print MSCs with 3D networked porous microstructure. The presence of macroscale through-thickness pores provides fast ion transport pathways and improves the rate capability of the devices even with solid-state electrolytes. During multiple-pass printing, the porous microstructure effectively absorbs the successively printed inks, allowing full printing of 3D structured MSCs comprising multiple vertically stacked cycles of current collectors, electrodes, and sold-state electrolytes. The all-solid-state heterogeneous 3D MSCs exhibit excellent vertical scalability and high areal energy density and power density, evidently outperforming the MSCs fabricated through general printing techniques.

Place, publisher, year, edition, pages
SHANGHAI JIAO TONG UNIV PRESS, 2020
Keywords
High-rate micro-supercapacitor, 3D micro-supercapacitor, Drying-mediated self-assembly, Graphene, Inkjet printing
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-269482 (URN)10.1007/s40820-020-0368-8 (DOI)000514306100001 ()2-s2.0-85078323980 (Scopus ID)
Note

QC 20200309

Available from: 2020-03-09 Created: 2020-03-09 Last updated: 2020-03-30Bibliographically approved
Zhou, Y., Zhang, Z.-Y., Huang, X., Li, J. & Li, T. (2020). Versatile Functionalization of Carbon Nanomaterials by Ferrate(VI). NANO-MICRO LETTERS, 12(1), Article ID 32.
Open this publication in new window or tab >>Versatile Functionalization of Carbon Nanomaterials by Ferrate(VI)
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2020 (English)In: NANO-MICRO LETTERS, ISSN 2311-6706, Vol. 12, no 1, article id 32Article in journal (Refereed) Published
Abstract [en]

As a high-valent iron compound with Fe in the highest accessible oxidation state, ferrate(VI) brings unique opportunities for a number of areas where chemical oxidation is essential. Recently, it is emerging as a novel oxidizing agent for materials chemistry, especially for the oxidation of carbon materials. However, the reported reactivity in liquid phase (H2SO4 medium) is confusing, which ranges from aggressive to moderate, and even incompetent. Meanwhile, the solid-state reactivity underlying the “dry” chemistry of ferrate(VI) remains poorly understood. Herein, we scrutinize the reactivity of K2FeO4 using fullerene C60 and various nanocarbons as substrates. The results unravel a modest reactivity in liquid phase that only oxidizes the active defects on carbon surface and a powerful oxidizing ability in solid state that can open the inert C=C bonds in carbon lattice. We also discuss respective benefit and limitation of the wet and dry approaches. Our work provides a rational understanding on the oxidizing ability of ferrate(VI) and can guide its application in functionalization/transformation of carbons and also other kinds of materials.

Place, publisher, year, edition, pages
SHANGHAI JIAO TONG UNIV PRESS, 2020
Keywords
Ferrate(VI), Reactivity, Carbon nanomaterials, Oxidation
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:kth:diva-267752 (URN)10.1007/s40820-019-0353-2 (DOI)000510847700018 ()2-s2.0-85078284994 (Scopus ID)
Note

QC 20200218

Available from: 2020-02-18 Created: 2020-02-18 Last updated: 2020-03-16Bibliographically approved
Zhou, Y., Zhang, Z.-Y. -., Huang, X., Li, J. & Li, T. (2020). Versatile Functionalization of Carbon Nanomaterials by Ferrate(VI). Nano-Micro Letters, 12(1), Article ID 32.
Open this publication in new window or tab >>Versatile Functionalization of Carbon Nanomaterials by Ferrate(VI)
Show others...
2020 (English)In: Nano-Micro Letters, ISSN 2311-6706, Vol. 12, no 1, article id 32Article in journal (Refereed) Published
Abstract [en]

As a high-valent iron compound with Fe in the highest accessible oxidation state, ferrate(VI) brings unique opportunities for a number of areas where chemical oxidation is essential. Recently, it is emerging as a novel oxidizing agent for materials chemistry, especially for the oxidation of carbon materials. However, the reported reactivity in liquid phase (H2SO4 medium) is confusing, which ranges from aggressive to moderate, and even incompetent. Meanwhile, the solid-state reactivity underlying the “dry” chemistry of ferrate(VI) remains poorly understood. Herein, we scrutinize the reactivity of K2FeO4 using fullerene C60 and various nanocarbons as substrates. The results unravel a modest reactivity in liquid phase that only oxidizes the active defects on carbon surface and a powerful oxidizing ability in solid state that can open the inert C=C bonds in carbon lattice. We also discuss respective benefit and limitation of the wet and dry approaches. Our work provides a rational understanding on the oxidizing ability of ferrate(VI) and can guide its application in functionalization/transformation of carbons and also other kinds of materials.[Figure not available: see fulltext.].

Place, publisher, year, edition, pages
Springer, 2020
Keywords
Carbon nanomaterials, Ferrate(VI), Oxidation, Reactivity, Carbon, Nanostructured materials, Potassium compounds, Reactivity (nuclear), Carbon nano-materials, Chemical oxidation, Ferrate, Functionalizations, High-valent irons, Materials chemistry, Oxidizing ability, Solid-state reactivity, Iron compounds
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-267989 (URN)10.1007/s40820-019-0353-2 (DOI)000510847700018 ()2-s2.0-85078284994 (Scopus ID)
Note

QC 20200401

Available from: 2020-04-01 Created: 2020-04-01 Last updated: 2020-04-01Bibliographically approved
Delekta, S. S., Adolfsson, K. H., Benyahia Erdal, N., Hakkarainen, M., Östling, M. & Li, J. (2019). Fully inkjet printed ultrathin microsupercapacitors based on graphene electrodes and a nano-graphene oxide electrolyte. Nanoscale, 11(21), 10172-10177
Open this publication in new window or tab >>Fully inkjet printed ultrathin microsupercapacitors based on graphene electrodes and a nano-graphene oxide electrolyte
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2019 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 11, no 21, p. 10172-10177Article in journal (Refereed) Published
Abstract [en]

The advance of miniaturized and low-power electronics has a striking impact on the development of energy storage devices with constantly tougher constraints in terms of form factor and performance. Microsupercapacitors (MSCs) are considered a potential solution to this problem, thanks to their compact device structure. Great efforts have been made to maximize their performance with new materials like graphene and to minimize their production cost with scalable fabrication processes. In this regard, we developed a full inkjet printing process for the production of all-graphene microsupercapacitors with electrodes based on electrochemically exfoliated graphene and an ultrathin solid-state electrolyte based on nano-graphene oxide. The devices exploit the high ionic conductivity of nano-graphene oxide coupled with the high electrical conductivity of graphene films, yielding areal capacitances of up to 313 mu F cm-2 at 5 mV s-1 and high power densities of up to 4 mW cm-3 with an overall device thickness of only 1 mu m.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-254076 (URN)10.1039/c9nr01427f (DOI)000470697800002 ()31107494 (PubMedID)2-s2.0-85066626832 (Scopus ID)
Note

QC 20190624

Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-08-16Bibliographically approved
Jiang, K., Baburin, I. A., Han, P., Yang, C., Fu, X., Yao, Y., . . . Zhuang, X. (2019). Interfacial Approach toward Benzene-Bridged Polypyrrole Film–Based Micro-Supercapacitors with Ultrahigh Volumetric Power Density. Advanced Functional Materials, Article ID 1908243.
Open this publication in new window or tab >>Interfacial Approach toward Benzene-Bridged Polypyrrole Film–Based Micro-Supercapacitors with Ultrahigh Volumetric Power Density
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2019 (English)In: Advanced Functional Materials, article id 1908243Article in journal (Refereed) Published
Abstract [en]

2D soft nanomaterials are an emerging research field due to their versatile chemical structures, easily tunable properties, and broad application potential. In this study, a benzene‐bridged polypyrrole film with a large area, up to a few square centimeters, is synthesized through an interfacial polymerization approach. As‐prepared semiconductive films exhibit a bandgap of ≈2 eV and a carrier mobility of ≈1.5 cm2 V−1 s−1, inferred from time‐resolved terahertz spectroscopy. The samples are employed to fabricate in‐plane micro‐supercapacitors (MSCs) by laser scribing and exhibit an ultrahigh areal capacitance of 0.95 mF cm−2, using 1‐ethyl‐3‐methylimidazolium tetrafluoroborate ([EMIM][BF4]) as an electrolyte. Importantly, the maximum energy and power densities of the developed MSCs reach values up to 50.7 mWh cm−3 and 9.6 kW cm−3, respectively; the performance surpassing most of the 2D material‐based MSCs is reported to date.

National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-268277 (URN)10.1002/adfm.201908243 (DOI)2-s2.0-85076766469 (Scopus ID)
Note

QC 20200319

Available from: 2020-03-19 Created: 2020-03-19 Last updated: 2020-03-19Bibliographically approved
Delekta, S. S., Östling, M. & Li, J. (2019). Wet Transfer of Inkjet Printed Graphene for Microsupercapacitors on Arbitrary Substrates. ACS Applied Energy Materials, 2(1), 158-163
Open this publication in new window or tab >>Wet Transfer of Inkjet Printed Graphene for Microsupercapacitors on Arbitrary Substrates
2019 (English)In: ACS Applied Energy Materials, ISSN 2574-0962, Vol. 2, no 1, p. 158-163Article in journal (Refereed) Published
Abstract [en]

Significant research interest is being devoted to exploiting the properties of graphene but the difficult integration on various substrates limits its use. In this regard, we developed a transfer technique that allows the direct deposition of inkjet printed graphene devices on arbitrary substrates, even 3D objects and living plants. With this technique, we fabricated micro-supercapacitors, which exhibited good adhesion on almost all substrates and no performance degradation induced by the process. Specifically, the microsupercapacitor on an orchid leaf showed an areal capacitance as high as 441 mu F cm(-2) and a volumetric capacitance of 1.16 F cm(-3). This technique can boost the use of graphene in key technological applications, such as self powered epidermal electronics and environmental monitoring systems.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
Keywords
graphene, wet transfer, inkjet printing, microsupercapacitors, arbitrary substrates
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-245956 (URN)10.1021/acsaem.8b01225 (DOI)000458706900019 ()2-s2.0-85065237266 (Scopus ID)
Note

QC 20190313

Available from: 2019-03-13 Created: 2019-03-13 Last updated: 2020-03-09Bibliographically approved
Loiko, P., Maria Serres, J., Delekta, S. S., Kifle, E., Boguslawski, J., Kowalczyk, M., . . . Östling, M. (2018). Inkjet-printing of graphene saturable absorbers for similar to 2 mu m bulk and waveguide lasers. Optical Materials Express, 8(9), 2803-2814
Open this publication in new window or tab >>Inkjet-printing of graphene saturable absorbers for similar to 2 mu m bulk and waveguide lasers
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2018 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 8, no 9, p. 2803-2814Article in journal (Refereed) Published
Abstract [en]

A technique for inkjet-printing of graphene saturable absorbers (SAs) for similar to 2-mu m bulk and waveguide lasers is presented. Based on distillation-assisted solvent exchange to fabricate high-concentration graphene inks, this technique is capable of producing few-layer graphene films of arbitrary shape. Absorption saturation of graphene printed on glass is demonstrated at similar to 1.56 mu m for picosecond and femtosecond pulses indicating a large fraction of the saturable losses. Inkjet-printed transmission-type graphene SAs are applied in passively Q-switched nanosecond thulium (Tm) microchip and planar waveguide lasers. The Tm microchip laser generates 136 ns / 1.2 mu J pulses at 1917 nm with a repetition rate of 0.37 MHz with a Q-switching conversion efficiency reaching 65%. The planar waveguide laser generates 98 ns / 21 nJ pulses at 1834 nm at a repetition rate in the MHz-range. The inkjet-printing technique is promising for production of patterned SAs for waveguide lasers.

Place, publisher, year, edition, pages
Optical Society of America, 2018
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-235113 (URN)10.1364/OME.8.002803 (DOI)000443314600037 ()2-s2.0-85052662930 (Scopus ID)
Note

QC 20180919

Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-09-19Bibliographically approved
Loiko, P., Maria Serres, J., Delekta, S. S., Kifle, E., Mateos, X., Baranov, A., . . . Östling, M. (2017). Inkjet-Printing of Graphene Saturable Absorbers for similar to 2 mu m Bulk and Waveguide Lasers. In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO): . Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA. IEEE
Open this publication in new window or tab >>Inkjet-Printing of Graphene Saturable Absorbers for similar to 2 mu m Bulk and Waveguide Lasers
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2017 (English)In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

We report on inkjet-printing of graphene saturable absorbers (SAs) suitable for passive Q-switching of similar to 2-mu m bulk and waveguide lasers. Using graphene-SA in a microchip Tm:KLu(WO4)(2) laser, 1.2 mu J/136 ns pulses are generated at 1917 nm.

Place, publisher, year, edition, pages
IEEE, 2017
Series
Conference on Lasers and Electro-Optics, ISSN 2160-9020
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-226251 (URN)000427296202314 ()978-1-9435-8027-9 (ISBN)
Conference
Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved
Li, J., Delekta, S. S., Zhang, P., Yang, S., Lohe, M. R., Zhuang, X., . . . Östling, M. (2017). Scalable Fabrication and Integration of Graphene Microsupercapacitors through Full Inkjet Printing. ACS Nano, 11(8), 8249-8256
Open this publication in new window or tab >>Scalable Fabrication and Integration of Graphene Microsupercapacitors through Full Inkjet Printing
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2017 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 11, no 8, p. 8249-8256Article in journal (Refereed) Published
Abstract [en]

A simple full-inkjet-printing technique is developed for the scalable fabrication of graphene-based microsupercapacitors (MSCs) on various substrates. High-performance graphene inks are formulated by integrating the electrochemically exfoliated graphene with a solvent exchange technique to reliably print graphene interdigitated electrodes with tunable geometry and "thickness. Along with the printed polyelectrolyte, poly(4-styrenesulfonic acid), the fully printed graphene-based MSCs attain the highest areal capacitance of similar to 0.7 mF/cm(2), substantially advancing the state-of-art of all-solid-state MSCs with printed graphene electrodes. The full printing solution enables scalable fabrication of MSCs and effective connection of them in parallel and/or in series at various scales. Remarkably, more than 100 devices have been connected to form large-scale MSC arrays as power banks on both silicon wafers and Kapton. Without any extra protection or encapsulation, the MSC arrays can be reliably charged up to 12 V and retain the performance even 8 months after fabrication.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-214515 (URN)10.1021/acsnano.7b03354 (DOI)000408520900076 ()28682595 (PubMedID)2-s2.0-85028458614 (Scopus ID)
Note

QC 20170929

Available from: 2017-09-29 Created: 2017-09-29 Last updated: 2019-08-16Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6430-6135

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