The Pt-based expensive catalysts and sluggish kinetics at cathode in oxygen reduction reaction(ORR) hinder the rapid commercialization of fuel cells. The quest for cheap, non-noble metal catalysts toreplace Pt-based catalysts has thus become a critical issue in the field of fuel cells. The carbon black (CB) andCB supported catalyst have been explored with the ultimate goal of finding a substitute for Pt-based catalystsin fuel cells. In the present work, we synthesized Zn-based MOF (1), 1 selectivity gives H2O2 followed bytwo-electron pathways. However, sample 1 modification might be needed to enhance its selectivity for thegeneration of H2O. Two composites of MOFs with carbon black and 1 were prepared to increase the H2Oyield, called 1.CB and 1.SCB. The electrochemical generation of H2O2 was analyzed by the rotating ringdisk electrode (RRDE) using catalyst 1. Following the addition of CB, H2O2 yields decreased from above93% (1) to 59% and 75% for 1.CB and 1.SCB, respectively. CB modified catalysts moved towards fourelectronpathways due to the conductive nature of CB. Electrochemical Impedance Spectroscopy (EIS) hasalso been performed to study in detail the conductivity effect of CB and kinetic behavior of ORR in alkalineelectrolyte. This research opens up a new path for ORR to advance non-precious metal catalysts based on MOFs.
Synopsis: This paper describes how we synthesized carbon Black (CB) supported MOF: Zn-based MOF (1), 1 selectivity gives H2O2 (two-electron pathways). Two composites of MOFs (1⊃CB and 1⊃SCB) were prepared to increase the H2O yield. After addition of CB, H2O2 yields decreased from above 93% (1) to 75% (1⊃SCB) and 59% (1⊃CB).
Volume 134, 2022
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