December 1 - 6, 2024
Boston, Massachusetts
Symposium Supporters
2024 MRS Fall Meeting & Exhibit
EN05.02.01

Oxygen Reduction on Organic Mixed Ionic-Electronic Conducting Polymers

When and Where

Dec 3, 2024
1:30pm - 2:00pm
Hynes, Level 3, Ballroom B

Presenter(s)

Co-Author(s)

Tyler Mefford1

University of California, Santa Barbara1

Abstract

Tyler Mefford1

University of California, Santa Barbara1
Organic mixed ionic-electronic conductors (OMIECs) are a class of conjugated polymers with tunable electronic and ionic transport properties enabled through polaron-forming ion insertion redox reactions. The energy to form these conductive polaronic states can be controlled through rational design of the polymer backbone to enable predominantly electron/cation (n-type) or hole/anion (p-type) transport. Simultaneously, electrolyte uptake into the bulk of the electrode can be controlled through incorporation of polar/non-polar sidechains. The ability to tune the energy of the redox-active states, the majority charge carrier, and the local reaction environment offers an opportunity to independently optimize activity and selectivity in electrochemical energy conversion processes with a single-phase electrode.<br/><br/>In this talk, I will discuss our efforts to develop these polymers as electrocatalysts for the oxygen reduction reaction. The electronic and chemical origins of reactivity are interrogated through pH-dependent electroanalytical characterization, operando optical and vibrational spectroscopy, charge-transport measurements, and ab initio/microkinetic simulations. The nature of the polaronic states provide a generalized framework to understand pathway selectivity towards the 2-electron H<sub>2</sub>O<sub>2</sub> or 4-electron H<sub>2</sub>O product and serve as a design principle in developing this emerging class of metal-free electrocatalysts.

Keywords

polymer

Symposium Organizers

Alexander Giovannitti, Chalmers University of Technology
Joakim Halldin Stenlid, KBR Inc., NASA Ames Research Center
Helena Lundberg, KTH Royal Institute of Technology
Germán Salazar Alvarez, Uppsala University

Session Chairs

Mathilde Luneau
Tyler Mefford

In this Session