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Zhao, Dan
Publications (7 of 7) Show all publications
Zhao, D., Martinelli, A., Willfahrt, A., Fischer, T., Bernin, D., Ullah Khan, Z., . . . Crispin, X. (2019). Polymer gels with tunable ionic Seebeck coefficient for ultra-sensitive printed thermopiles. Nature Communications, 10, Article ID 1093.
Open this publication in new window or tab >>Polymer gels with tunable ionic Seebeck coefficient for ultra-sensitive printed thermopiles
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 1093Article in journal (Refereed) Published
Abstract [en]

Measuring temperature and heat flux is important for regulating any physical, chemical, and biological processes. Traditional thermopiles can provide accurate and stable temperature reading but they are based on brittle inorganic materials with low Seebeck coefficient, and are difficult to manufacture over large areas. Recently, polymer electrolytes have been proposed for thermoelectric applications because of their giant ionic Seebeck coefficient, high flexibility and ease of manufacturing. However, the materials reported to date have positive Seebeck coefficients, hampering the design of ultra-sensitive ionic thermopiles. Here we report an “ambipolar” ionic polymer gel with giant negative ionic Seebeck coefficient. The latter can be tuned from negative to positive by adjusting the gel composition. We show that the ion-polymer matrix interaction is crucial to control the sign and magnitude of the ionic Seebeck coefficient. The ambipolar gel can be easily screen printed, enabling large-area device manufacturing at low cost.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
Keywords
Ionic Thermopiles; thermoelectric; screen printing; ionic liquid
National Category
Other Physics Topics
Identifiers
urn:nbn:se:liu:diva-154943 (URN)10.1038/s41467-019-08930-7 (DOI)000460410800001 ()30842422 (PubMedID)
Note

Funding agencies:  Swedish research council [2016-03979, 2015-05070]; Swedish Governmental Agency for Innovation Systems [2015-04859]; Advanced Functional Materials Center at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]; United States National Science Found

Available from: 2019-03-06 Created: 2019-03-06 Last updated: 2019-03-26Bibliographically approved
Che, C., Vagin, M., Wijeratne, K., Zhao, D., Warczak, M., Jonsson, M. & Crispin, X. (2018). Conducting Polymer Electrocatalysts for Proton-Coupled Electron Transfer Reactions: Toward Organic Fuel Cells with Forest Fuels. Advanced Sustainable Systems, 317
Open this publication in new window or tab >>Conducting Polymer Electrocatalysts for Proton-Coupled Electron Transfer Reactions: Toward Organic Fuel Cells with Forest Fuels
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2018 (English)In: Advanced Sustainable Systems, ISSN 2366-7486, Vol. 317Article in journal (Refereed) Published
Abstract [en]

Lignin is one of the most abundant biopolymers, constituting 25% of plants. The pulp and paper industries extract lignin in their process and today seek new applications for this by-product. Here, it is reported that the aromatic alcohols obtained from lignin depolymerization can be used as fuel in high power density electrical power sources. This study shows that the conducting polymer poly(3,4-ethylenedioxythiophene), fabricated from abundant ele-ments via low temperature synthesis, enables efficient, direct, and reversible chemical-to-electrical energy conversion of aromatic alcohols such as lignin residues in aqueous media. A material operation principle related to the rela-tively high molecular diffusion and ionic conductivity within the conducting polymer matrix, ensuring efficient uptake of protons in the course of proton-coupled electron transfers between organic molecules is proposed.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:liu:diva-148575 (URN)10.1002/adsu.201800021 (DOI)
Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2020-01-07
Malti, A., Edberg, J., Granberg, H., Ullah Khan, Z., Andreasen, J. W., Liu, X., . . . Berggren, M. (2016). An Organic Mixed Ion–Electron Conductor for Power Electronics. Advanced Science, Article ID 1500305.
Open this publication in new window or tab >>An Organic Mixed Ion–Electron Conductor for Power Electronics
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2016 (English)In: Advanced Science, ISSN 2198-3844, article id 1500305Article in journal (Refereed) Published
Abstract [en]

A mixed ionic–electronic conductor based on nanofibrillated cellulose composited with poly(3,4-ethylene-dioxythio­phene):­poly(styrene-sulfonate) along with high boiling point solvents is demonstrated in bulky electrochemical devices. The high electronic and ionic conductivities of the resulting nanopaper are exploited in devices which exhibit record values for the charge storage capacitance (1F) in supercapacitors and transconductance (1S) in electrochemical transistors.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2016
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-123225 (URN)10.1002/advs.201500305 (DOI)000370336500011 ()
Note

Funding agencies:  Knut and Alice Wallenberg foundation [KAW 2011.0050]; Onnesjo Foundation; Advanced Functional Materials Center at Linkoping University; Stiftelsen for strategisk forskning (SSF); RISE Research Institutes of Sweden; U.S. National Science Foundation [DMR-12

Available from: 2015-12-08 Created: 2015-12-08 Last updated: 2018-02-15
Zhao, D., Wang, H., Ullah Khan, Z., Chen, J. C., Gabrielsson, R., Jonsson, M., . . . Crispin, X. (2016). Ionic thermoelectric supercapacitors. Energy & Environmental Science, 9(4), 1450-1457
Open this publication in new window or tab >>Ionic thermoelectric supercapacitors
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2016 (English)In: Energy & Environmental Science, ISSN 1754-5692, E-ISSN 1754-5706, Vol. 9, no 4, p. 1450-1457Article in journal (Refereed) Published
Abstract [en]

Temperature gradients are generated by the sun and a vast array of technologies and can induce molecular concentration gradients in solutions via thermodiffusion (Soret effect). For ions, this leads to a thermovoltage that is determined by the thermal gradient Delta T across the electrolyte, together with the ionic Seebeck coefficient alpha(i). So far, redox-free electrolytes have been poorly explored in thermoelectric applications due to a lack of strategies to harvest the energy from the Soret effect. Here, we report the conversion of heat into stored charge via a remarkably strong ionic Soret effect in a polymeric electrolyte (Seebeck coefficients as high as alpha(i) = 10 mV K-1). The ionic thermoelectric supercapacitor (ITESC) is charged under a temperature gradient. After the temperature gradient is removed, the stored electrical energy can be delivered to an external circuit. This new means to harvest energy is particularly suitable for intermittent heat sources like the sun. We show that the stored electrical energy of the ITESC is proportional to (Delta T alpha(i))(2). The resulting ITESC can convert and store several thousand times more energy compared with a traditional thermoelectric generator connected in series with a supercapacitor.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2016
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-128769 (URN)10.1039/c6ee00121a (DOI)000374351200029 ()
Note

Funding Agencies|European Research Council (ERC) [307596]; Swedish foundation for strategic research (SSF); Knut and Alice Wallenberg foundation (KAW); Swedish Energy Agency; Wenner-Gren Foundations; Advanced Functional Materials Centre at Linkoping University.

The previous status of this article was Manuscript.

Available from: 2016-05-30 Created: 2016-05-30 Last updated: 2018-08-31Bibliographically approved
Malti, A., Brooke, R., Liu, X., Zhao, D., Andersson Ersman, P., Fahlman, M., . . . Crispin, X. (2015). A substrate-free electrochromic device.
Open this publication in new window or tab >>A substrate-free electrochromic device
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2015 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Electrochromic displays based on conducting polymers offer higher contrast, are cheaper, faster, more durable, and easier to synthesize as well as to process than their non-polymeric counterparts. The field of organic electrochromics has made considerable strides in the last decade with the development of new materials and methods. Here, we present a cellulose composite combining PEDOT:PSS and TiO2 that is a free-standing electrochromic material. Owing to the excellent refractive properties of TiO2, this nanocomposite is white in the neutral state and, when reduced, turns blue resulting in a color contrast exceeding 30. The composite has a granular morphology and, as shown by AFM, an intermingling of TiO2 and PEDOT:PSS at the surface. Variation of TiO2 within the material led to a trade-off in optical and electrical properties. A proof of concept free-standing electrochromic device was fabricated by casting several layers, which was found to be stable over 100 cycles.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-122020 (URN)
Available from: 2015-10-16 Created: 2015-10-16 Last updated: 2017-02-03Bibliographically approved
Malti, A., Edberg, J., Granberg, H., Khan, Z. U., Andreasen, J. W., Liu, X., . . . Berggren, M. (2015). Enabling organic power electronics with a cellulose nano-scaffold.
Open this publication in new window or tab >>Enabling organic power electronics with a cellulose nano-scaffold
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2015 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Exploiting the nanoscale properties of certain materials enables the creation of new materials with a unique set of properties. Here, we report on an electronic (and ionic) conducting paper based on cellulose nanofibrils (CNF) composited with poly(3,4-ethylene-dioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS), which may be facilely processed into large three-dimensional geometries, while keeping unprecedented electronic and ionic conductivities of 140 S/cm and 20 mS/cm, respectively. This is achieved by cladding the CNF with PEDOT:PSS, and trapping an ion-transporting phase in the interstices between these nanofibrils. The unique properties of the resulting nanopaper composite have been used to demonstrate (electrochemical) transistors, supercapacitors and conductors resulting in exceptionally high device parameters, such as an associated transconductance, charge storage capacity and current level beyond 1 S, 1 F and 1 A, respectively.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-122021 (URN)
Available from: 2015-10-16 Created: 2015-10-16 Last updated: 2018-02-15Bibliographically approved
Wang, H., Khan, Z. U., Zhao, D., Berggren, M. & Crispin, X. (2015). Ionic Thermoelectric effect in Polyelectrolytes.
Open this publication in new window or tab >>Ionic Thermoelectric effect in Polyelectrolytes
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2015 (English)Manuscript (preprint) (Other academic)
National Category
Physical Sciences Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-121980 (URN)
Available from: 2015-10-14 Created: 2015-10-14 Last updated: 2017-02-03Bibliographically approved
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