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DTSTAMP:20260607T015548Z
UID:https://www.mr.mpg.de/events/20183/10694
DTSTART:20190912T110000Z
DTEND:20190912T123000Z
CLASS:PUBLIC
CREATED:20190904T121608Z
DESCRIPTION: Ion transport in block copolymer electrolytesIon conducting po
 lymers play a central role in the development of safer and more efficient 
 electrochemical devices such as batteries\, fuel cells\, and electrolyzers
 . Self-assembling polymeric materials with multiple components offer pathw
 ays to simultaneously optimize more than one material function\, as well a
 s control structure at the nanoscale. In the first part of my talk\, I wil
 l highlight the advantages and new information that can be derived from th
 e use of custom microfabricated interdigitated electrodes (IDEs) as a plat
 form to probe extrinsic and intrinsic transport properties of polymer elec
 trolytes films through electrochemical impedance spectroscopy (EIS). The s
 econd part of my talk will address the use block copolymer electrolytes (B
 CEs) as ion conducting membranes. BCEs provide the means to realize high i
 onic conductivity and mechanical robustness by judicious choice of block c
 hemistry. To understand the potential of these materials\, however\, trans
 port properties through BCEs\, with domain structure at the nanoscale\, mu
 st be understood at a fundamental level at the device scale\, 10s to 100s 
 of microns. Extrinsic properties of BCEs depend strongly on the presence o
 f grain boundaries and defects. Conductivity is found to be directly propo
 rtional to the number and length of domains of the BCE that are connected 
 from one electrode to the other. Any conducting domain within the film imp
 eded with even a single non-conducting defect (e.g. a dislocation) does no
 t contribute to the conductivity and increases the capacitance of the mate
 rial. Finally\, by completely aligning and connecting the conductive domai
 ns between electrodes\, we can quantitatively investigate the intrinsic tr
 ansport properties of BCEs and compare them to their homopolymer analogs. 
 We conclude that the interfacial mixing between the blocks at domain inter
 faces is the dominant factor in reducing ionic mobility in BCEs\, reducing
  the expected conductivity based on volume fraction by as much a factor of
  2.
LAST-MODIFIED:20190904T121610Z
LOCATION:MPI for Medical Research\, Room: Seminar Room A/B
ORGANIZER;CN=Prof. Dr. Joachim Spatz:mailto:pr@mpimf-heidelberg.mpg.de
SUMMARY:Rudolf Mößbauer Colloquium with Paul Nealey (University of Chicag
 o): Rudolf Mößbauer Colloquium with Paul Nealey (University of Chicago)
URL;VALUE=URI:https://www.mr.mpg.de/events/20183/10694
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