Single
entity electrochemistry (SEE) has emerged as a promising
method for precise measurement and fundamental understanding of the
heterogeneity of single entities. Herein, we propose the dual responsive
SEE sensing of the silver nanoparticles (AgNPs) collisions through
a wireless nanopore electrode (WNE). Given the high temporal resolution
and low background noise features, the Faradaic and capacitive currents
provide the AgNPs’ collision response. The electron transfer
between the AgNPs and the electrode surface is identified under a
bipolar electrochemical mechanism. Compared to the ultramicroelectrode,
multistep oxidation of 30 nm AgNPs is observed due to the decreased
interaction of the nanoparticles to the electrode. Moreover, the nanoconfinement
of WNE plays a vital role in the repeated capturing of nanoparticles
from the nontunneling region into the tunneling region until a complete
oxidation. As a comparison, the collision of 5 nm AgNPs with higher
interaction at the electrode surface shows great decrease in the multistep
events. Thus, we propose a nanoconfined interaction based SEE method
which could be used for simultaneously capturing the Faradaic and
capacitive response. The nanoconfined interaction based SEE method
holds great promise in the better understanding of heterogeneity
of single particles.
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.
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