Header menu link for other important links
X
Cobalt-Based Coordination Polymer for Oxygen Reduction Reaction
, Prabu Mani, Sheelam A., Shubhajit Das, Wang G., Ramani V.K., Pati S.K., Mandal S.
Published in American Chemical Society
2018
Volume: 3
   
Issue: 4
Pages: 3830 - 3834
Abstract
Lack of control over the structure and electrically nonconductive properties of coordination polymers (CPs) creates a major hindrance to designing an active electrocatalyst for oxygen reduction reaction (ORR). Here, we report a new semiconductive and low-optical band gap CP structure [Co3(μ3-OH)(BTB)2(BPE)2Co0.5N(C5H5)], 1, that exhibits high-performance ORR in alkaline medium. The electrical conductivity of compound 1 was measured using impedance spectroscopy and found to be 5 × 10-4 S cm-1. The Ketjenblack EC-600JD carbon used as a support for all the electrochemical methods such as cyclic voltammetry, rotating disk electrode, rotating ring-disk electrode and Koutecký-Levich analysis. The as-synthesized Co-based catalyst has the ability to reduce O2 to H2O by a nearly four-electron process. The crystal structure of 1 shows that the trimeric unit Co3(μ3-OH)(COO)5N3 and monomeric unit Co(COO)2(NC5H4)22+ are linked with BTB and BPE linkers to form a three-dimensional structure. Theoretical calculations predict that the monomeric center acts as an active catalytic site for ORR. This could be due to the efficient overlap of highest occupied molecular orbital-lowest unoccupied molecular orbital between monomer and O2 molecule. This CP, 1, shows facile 3.6-electron ORR, and it is inexpensive compared with widely used Pt catalysts. Therefore, this CP can be used as a promising cathode material for fuel cells in terms of efficiency and cost effectiveness. © 2018 American Chemical Society.
About the journal
JournalData powered by TypesetACS Omega
PublisherData powered by TypesetAmerican Chemical Society
Open AccessNo