ic7b02074_si_001.pdf (1.41 MB)
Light-driven Hydrogen Evolution from Water by a Tripodal Silane Based CoII6L18 Octahedral Cage
journal contribution
posted on 2017-10-18, 14:06 authored by Mahesh S. Deshmukh, Vishwanath S. Mane, Avinash S. Kumbhar, Ramamoorthy BoomishankarThe
octahedral cage assembly [CoII6L18Cl6(H2O)6]Cl6 has been synthesized in a single-step reaction by using a polypyridyl-functionalized
tripodal silane ligand. The electrochemical behavior of the cage in
water exhibits the pH dependence of potential as well as catalytic
current indicating the possible involvement of proton-coupled electron
transfer in H2 evolution. Electrocatalytic hydrogen evolution
from an aqueous buffered solution gave a turnover frequency of 16
h–1. Further, this cage assembly has been explored
as a photocatalyst (blue light irradiation λ 469 nm) for the
evolution of H2 from water in the presence of Ru(bpy)32+ as a photosensitizer and ascorbic acid as a
sacrificial electron donor. This catalytic reaction is found to be
pseudo first order with a turnover frequency of 20.50 h–1.