Silver salt oxide shows superior oxidation ability for
the applications
of superconductivity, sterilization, and catalysis. However, due to
the easy decomposition, the catalytic properties of silver salt oxide
are difficult to characterize by conventional methods. Herein, we
used a closed-type wireless nanopore electrode (CWNE) to in
situ and real-time monitor the electrocatalytic performance
of Ag7NO11 in the oxygen evolution reaction.
The real-time current recording revealed that the deposited Ag7NO11 on the CWNE tip greatly enhanced the oxidative
capacity of the electrode, resulting in water splitting. The statistical
event analysis reveals the periodic O2 bubble formation
and dissolution at the Ag7NO11 interface, which
ensures the characterization of the oxygen evolution electrocatalytic
process at the nanoscale. The calculated
k
cat
and Markov chain modeling suggest the
anisotropy of Ag7NO11 at a low voltage may lead
to multiple catalytic rates. Therefore, our results demonstrate the
powerful capability of CWNE in direct and in situ characterization of gas–liquid–solid catalytic reactions
for unstable catalysts.