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Georen, P
Alternative names
Publications (10 of 19) Show all publications
Bayrak Pehlivan, I., Marsal, R., Georén, P., Granqvist, C.-G. & Niklasson, G. A. (2011). Characterization and Modeling of Poly (ethylene imine)-LiTFSI Polymer Electrolytes.
Open this publication in new window or tab >>Characterization and Modeling of Poly (ethylene imine)-LiTFSI Polymer Electrolytes
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2011 (English)Other (Other academic)
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-187902 (URN)
Note

Graduate workshop Materials for the 21st Century (2011) Uppsala, Sweden.

Available from: 2012-12-11 Created: 2012-12-11 Last updated: 2016-04-20
Bayrak Pehlivan, I., Granqvist, C.-G., Georén, P., Marsal, R. & Niklasson, G. A. (2011). Influence of SiO2 nanoparticles on ionic conductivity of PEI-LiTFSI electrolytes. In: : . Paper presented at European Polymer Congress 2011; XII Congress of the Specialized Group of Polymers, Granada, Spain.
Open this publication in new window or tab >>Influence of SiO2 nanoparticles on ionic conductivity of PEI-LiTFSI electrolytes
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2011 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-187900 (URN)
Conference
European Polymer Congress 2011; XII Congress of the Specialized Group of Polymers, Granada, Spain
Available from: 2012-12-11 Created: 2012-12-11 Last updated: 2016-04-20
Bayrak Pehlivan, I., Georén, P., Marsal, R., Granqvist, C.-G. & Niklasson, G. A. (2011). Ion conduction of branched polyethyleneimine-lithium bis(trifluoromethylsulfonyl) imide electrolytes. Electrochimica Acta, 57, 201-206
Open this publication in new window or tab >>Ion conduction of branched polyethyleneimine-lithium bis(trifluoromethylsulfonyl) imide electrolytes
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2011 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 57, p. 201-206Article in journal (Refereed) Published
Abstract [en]

Ionic conductivity of polymer electrolytes containing branched poly (ethylene imine) (BPEI) and lithium bis(trifluoromethyl sulfonyl)imide (LiTFSI) was measured between temperatures of 20 and 70◦C and molar ratios of 20:1 and 400:1. The electrolytes were characterized by impedance spectroscopy, differential scanning calorimetry, and viscosity measurements. At room temperature, the maximum conductivity was 2×10−6 S/cm at a molar ratio of 50:1. The molar conductivity of the electrolytes displayed first a minimum and then a maximum upon increasing salt concentration. A proportionality of molar conductivity to segmental mobility was seen from glass transition temperature and viscosity measurements. Analysis of the Walden product and isoviscosity conductivity showed that the percentage of ions bound in ion pairs increased at low concentrations below 0.1 mol/kg. The average dipole moment decreased with salt concentration. The temperature dependence of the ionic conductivity showed an Arrhenius behavior.

Keywords
Ionic conductivity, Poly (ethylene imine), Arrhenius behavior, Walden rule, Ion pairing
National Category
Other Materials Engineering
Research subject
Chemistry with specialization in Polymer Chemistry; Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-163443 (URN)10.1016/j.electacta.2011.04.040 (DOI)000298463900029 ()
Available from: 2011-12-12 Created: 2011-12-12 Last updated: 2017-12-08Bibliographically approved
Bayrak Pehlivan, I., Granqvist, C.-G., Marsal, R., Georén, P. & Niklasson, G. A. (2011). Optical properties of PEI-LiTFSI polymer electrolytes with added SiO2 nanoparticles. In: : . Paper presented at E-MRS Fall Meeting (2011) Warsaw, Poland.
Open this publication in new window or tab >>Optical properties of PEI-LiTFSI polymer electrolytes with added SiO2 nanoparticles
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2011 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-187901 (URN)
Conference
E-MRS Fall Meeting (2011) Warsaw, Poland
Available from: 2012-12-11 Created: 2012-12-11 Last updated: 2016-04-20
Granqvist, C.-G., Green, S., Niklasson, G. A., Mlyuka, N. R., von Kraemer, S. & Georén, P. (2010). Advances in chromogenic materials and devices. Thin Solid Films, 518(11), 3046-3053
Open this publication in new window or tab >>Advances in chromogenic materials and devices
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2010 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 518, no 11, p. 3046-3053Article in journal (Refereed) Published
Abstract [en]

Chromogenic materials allow the transmittance of visible light and solar energy to be varied under the action of an external stimulus This paper first discusses buildings related energy savings that can be accomplished by chromogenic technologies, and their beneficial effects on comfort issues We then summarize recent work on thermochromic VO2-based thin films with particular attention to multi-layers of VO2 and TiO2 and to new VO2 Mg films for which the doping gives significantly lowered absorption of visible light The final part covers electrochromic materials and devices with foci on coloration efficiency and on durability issues for foil-type constructions based on films of WO3 and NiO.

Keywords
Chromogenic material, Electrochromism, Thermochromism, Vanadium dioxide, Tungsten oxide, Nickel oxide, Optical properties, Energy efficiency
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-137456 (URN)10.1016/j.tsf.2009.08.058 (DOI)000276440700031 ()
Available from: 2010-12-15 Created: 2010-12-15 Last updated: 2018-08-30Bibliographically approved
Pehlivan, E., Niklasson, G. A., Granqvist, C.-G. & Georén, P. (2010). Ageing of electrochromic WO3 coatings characterized by electrochemical impedance spectroscopy. Physica status solidi. A, Applied research, 207(7), 1772-1776
Open this publication in new window or tab >>Ageing of electrochromic WO3 coatings characterized by electrochemical impedance spectroscopy
2010 (English)In: Physica status solidi. A, Applied research, ISSN 0031-8965, E-ISSN 1521-396X, Vol. 207, no 7, p. 1772-1776Article in journal (Refereed) Published
Abstract [en]

We have developed a method for characterization of ageing of electrochromic materials by electrochemical impedance spectroscopy (EIS). Electrochromic WO3 thin films have been electrochemically cycled in propionic acid electrolyte and probed by EIS and optical measurements. A very small amount of optical degradation was observed in both the bleached and coloured states. The samples exhibited a few hundred times higher impedance in the bleached state than in the coloured state. It was observed that, in the bleached state, impedance values at low frequencies increased significantly with increasing number of cycles.

Keywords
electrochromics, electrochemistry, optical properties, WO3, impedance spectroscopy
National Category
Physical Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-136517 (URN)10.1002/pssa.200983758 (DOI)000280719200053 ()
Available from: 2010-12-13 Created: 2010-12-13 Last updated: 2017-12-11Bibliographically approved
Pehlivan, E., Georén, P., von Kraemer, S., Niklasson, G. & Granqvist, C.-G. (2010). Electrochemical impedance spectroscopy of nickel oxide thin films. In: : . Paper presented at 9th International Meeting on Electrochromism, Bordeaux, France, September 5-9, 2010. , 154
Open this publication in new window or tab >>Electrochemical impedance spectroscopy of nickel oxide thin films
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2010 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-285223 (URN)
Conference
9th International Meeting on Electrochromism, Bordeaux, France, September 5-9, 2010
Available from: 2016-04-19 Created: 2016-04-19 Last updated: 2018-08-30
Pehlivan, E., Georén, P., von Kraemer, S., Niklasson, G. & Granqvist, C.-G. (2010). Impedance Behavior of WO3 and NiO in Different Electrolytes. In: Abstracts for IME-9 Conference: . Paper presented at IME-9 Conference, Bordeaux, France, 2010.
Open this publication in new window or tab >>Impedance Behavior of WO3 and NiO in Different Electrolytes
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2010 (English)In: Abstracts for IME-9 Conference, 2010Conference paper, Published paper (Refereed)
National Category
Physical Sciences Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-284164 (URN)
Conference
IME-9 Conference, Bordeaux, France, 2010
Available from: 2016-04-15 Created: 2016-04-15 Last updated: 2018-08-30
Bayrak Pehlivan, I., Marsal, R., Goerén, P., Granqvist, C.-G. & Niklasson, G. A. (2010). Impedance Spectroscopy of [PEI-SiO2] Nanocomposite Polymer Electrolytes. In: 9th International Meeting on Electrochromism, 2010: . Paper presented at 9th International Meeting on Electrochromism, 2010.
Open this publication in new window or tab >>Impedance Spectroscopy of [PEI-SiO2] Nanocomposite Polymer Electrolytes
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2010 (English)In: 9th International Meeting on Electrochromism, 2010, 2010Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-139624 (URN)
Conference
9th International Meeting on Electrochromism, 2010
Available from: 2010-12-28 Created: 2010-12-28 Last updated: 2018-08-30
Bayrak Pehlivan, I., Georén, P., Marsal, R., Granqvist, C.-G. & Niklasson, G. A. (2010). Ionic conductivity of PEI-LiTFSI electrolytes. In: XII International Symposium on Polymer Electrolytes, 2010: . Paper presented at XII International Symposium on Polymer Electrolytes, 2010.
Open this publication in new window or tab >>Ionic conductivity of PEI-LiTFSI electrolytes
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2010 (English)In: XII International Symposium on Polymer Electrolytes, 2010, 2010Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-139622 (URN)
Conference
XII International Symposium on Polymer Electrolytes, 2010
Available from: 2010-12-28 Created: 2010-12-28 Last updated: 2016-04-18
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