Abstract
Fe-Based atomically dispersed single site catalysts are the state of the art platinum group metal (PGM)-free catalysts in proton exchange membrane fuel cells (PEMFC). However, due to the Fenton reactions potentially causing degradation of ionomers and membranes, Fe content in PGM-free catalysts must be minimized. Therefore, development low-Fe or Fe-free cathode catalysts are urgently needed for durable and inexpensive PEMFCs. Based on our previous effort to develop nitrogen‐coordinated single Co atom catalyst derived from Co‐doped metal‐organic frameworks (MOFs) [1,2], in this presentation, we will further discuss our recent effort to elucidate the formation mechanisms of CoNx sited driven by thermal treatment. Also we will introduce our new progress to prepare electronspun Co catalysts and binary CoFe catalysts for oxygen reduction in acidic electrolytes. Detailed synthesis procedure, extensive characterization, and RDE activity and fuel cell performance will be discussed.
References
(1) Wang, X. X.; Cullen, D. A.; Pan, Y.-T.; Hwang, S.; Wang, M.; Feng, Z.; Wang, J.; Engelhard, M. H.; Zhang, H.; He, Y.et al. Nitrogen-Coordinated Single Cobalt Atom Catalysts for Oxygen Reduction in Proton Exchange Membrane Fuel Cells. Advanced Materials 2018, 30 (11), 1706758.
(2) He, Y.; Hwang, S.; Cullen, D. A.; Uddin, M. A.; Langhorst, L.; Li, B.; Karakalos, S.; Kropf, A. J.; Wegener, E. C.; Sokolowski, J.et al. Highly active atomically dispersed CoN4 fuel cell cathode catalysts derived from surfactant-assisted MOFs: carbon-shell confinement strategy. Energy & Environmental Science 2019, 12 (1), 250.