Two cobalt(iii) complexes containing inexpensive Schiff-base ligands have been found to be active for proton reduction at low overpotentials. The dinitro and tetranitro derivatized Schiff-base complexes show catalytic activity at -0.96 V and -1.1 V vs. Fc/Fc, respectively, resulting in overpotentials of 120 mV and 280 mV. Foot-of-the-wave analysis is used to examine the kinetic properties of these complexes, yielding a theoretical TOF of up to 4100 s. Experimental TOFs of 7 sand 3 s are observed. Catalytic Tafel plots are also presented in order to benchmark the relationship between turnover frequency and overpotential.
Proton-coupled electron transfer
(PCET) is a fundamental step in
a wide range of electrochemical processes, including those of interest
in energy conversion and storage. Despite its importance, several
mechanistic details of such reactions remain unclear. Here, we have
combined a proton donor (tertiary ammonium) with a vibrational Stark-shift
probe (benzonitrile), to track the process from the entry of the reactants
into the electrical double layer (EDL), to the PCET reaction associated
with proton donation to the electrode, and the formation of products.
We have used operando vibrational spectroscopy and
periodic density functional theory under electrochemical bias to assign
the reactant and product peaks and their Stark shifts. We have identified
three main stages for the progress of the PCET reaction as a function
of applied potential. First, we have determined the potential necessary
for desolvation of the reactants and their entry into the polarizing
environment of the EDL. Second, we have observed the appearance of
product peaks prior to the onset of steady state electrochemical current,
indicating formation of a stationary population of products that does
not turn over. Finally, more negative of the onset potential, the
electrode attracts additional reactants, displacing the stationary
products and enabling steady state current. This work shows that the
integration of a vibrational Stark-shift probe with a proton donor
provides critical insight into the interplay between interfacial electrostatics
and heterogeneous chemical reactions. Such insights cannot be obtained
from electrochemical measurements alone.
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