This talk will overview methods in the field developed for characterizing electrode-level losses in PGM-free electrodes and identifying the underlying mechanisms that hinder transport and limit high power density. The overview will include methods we have recently applied to Fe-N-C PGM-free catalysts synthesized from polyaniline and cyanimide (Fe-CM-PANI). As the figure illustrates, these methods include electrochemical measurements, nano-scale X-ray computed tomography (nano-CT) of 3D pore and ionomer morphology1, particle-scale simulation2, and PEFC simulation and optimization3. These studies are then subsequently applied to advancing electrode performance as well as guiding targets for future catalyst synthesis.
1. S. Komini Babu, H.T Chung, P. Zelenay, ACS Appl. Mater. Interfaces, 2016 8 (48), pp 32764–32777.
2. S. Ogawa, S. Komini Babu, H.T. Chung, P Zelenay, S Litster, ECS Trans 75 (14), pp 139-146.