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Room temperature synthesis of transition metal silicide-conducting polymer micro-composites for thermoelectric applications
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-2930-676X
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
Innventia AB, Sweden.
Innventia AB, Sweden.
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2017 (English)In: Synthetic metals, ISSN 0379-6779, E-ISSN 1879-3290, Vol. 225, 55-63 p.Article in journal (Refereed) Published
Abstract [en]

Organic polymer thermoelectrics (TE) as well as transition metal (TM) silicides are two thermoelectric class of materials of interest because they are composed of atomic elements of high abundatice; which is a prerequisite for mass implementation of thermoelectric (TE) solutions for solar and waste heat recovery. But both materials have drawbacks when it comes to finding low-cost manufacturing. The metal silicide needs high temperature (amp;gt;1000 degrees C) for creating TE legs in a device from solid powder, but it is easy to achieve long TE legs in this case. On the contrary, organic TEs are synthesized at low temperature from solution. However, it is difficult to form long legs or thick films because of their low solubility. In this work, we propose a novel method for the room temperature synthesis of TE composite containing the microparticles of chromium disilicide; CrSi2 (inorganic filler) in an organic matrix of nanofibrillated cellulose-poly(3,4-ethyelenedioxythiophene)-polystyrene sulfonate (NFC-PEDOT:PSS). With this method, it is easy to create long TE legs in a room temperature process. The originality of the approach is the use of conducting polymer aerogel microparticles mixed with CrSi2 microparticles to obtain a composite solid at room temperature under pressure. We foresee that the method can be scaled up to fabricate and pattern TE modules. The composite has an electrical conductivity (sigma) of 5.4 +/- 0.5 S/cm and the Seebeck coefficient (a) of 88 +/- 9 mu V/K, power factor (alpha(2)sigma) of 4 +/- 1 mu Wm(-1) K-2 at room temperature. At a temperature difference of 32 degrees C, the output power/unit area drawn across the load, with the resistance same as the internal resistance of the device is 0.6 +/- 0.1 mu W/cm(2). (C) 2017 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2017. Vol. 225, 55-63 p.
Keyword [en]
TM silicide-PEDOT:PSS composite; NFC microparticles; Chromium disilicide; Conducting polymer-Inorganic TE composite; Composite thermoelectrics
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-136665DOI: 10.1016/j.synthmet.2017.01.007ISI: 000395604200007OAI: oai:DiVA.org:liu-136665DiVA: diva2:1089753
Conference
International Conference on Organic and Hybrid Thermoelectrics (ICOT)
Note

Funding Agencies|European Research Council [307596]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]; "the Power Papers project" - Knut and Alice Wallenberg foundation; RISE - the Research Institutes of Sweden; University Grants Commission, India

Available from: 2017-04-20 Created: 2017-04-20 Last updated: 2017-04-20

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