In Situ Characterization of Oxygen Evolution Electrocatalysis of Silver Salt Oxide on a Wireless Nanopore Electrode

Abstract

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.

Emerging Data Processing Methods for Single‐Entity Electrochemistry

“…Then, these features were further described using Markov chain modeling to uncover the multiple folding and unfolding pathways of a single peptide. Recently, PyNanoLab extracted the electrocatalytic signal features from a single silver salt oxide on wireless nanopore electrodes, thus providing an efficient in situ evaluation of the oxygen evolution electrocatalytic capability of Ag 7 NO 11 in a closed‐type wireless nanopore electrode [28] …”

Emerging Data Processing Methods for Single‐Entity Electrochemistry

“…Recently, PyNano-Lab extracted the electrocatalytic signal features from a single silver salt oxide on wireless nanopore electrodes, thus providing an efficient in situ evaluation of the oxygen evolution electrocatalytic capability of Ag 7 NO 11 in a closedtype wireless nanopore electrode. [28]…”

Iontronic Photoelectrochemical Biorecognition Probing

“…One is the Faradaic type, which is based on conventional redox electrochemistry to generate quantitative Faraday currents with wired signal transduction. 4,5 For example, Pan et al used a carbonized nanopipette for the detection of liposomes by the Faradaic current produced by oxidation/reduction of redox species. 6 In contrast, without Ohmic contact, non-Faradaic E-nanopipettes operate upon the directional ionic migration and the biorelevant alternation of the ionic motion to yield valuable information, which has been shown to be a promising route to address nonelectrogenic targets, especially the major endogenous nonredox species in the cytoplasm.…”

“…The rational conversion of nanopipettes into advanced electrochemical nanotools (denoted E-nanopipette) has recently gained momentum for nanoscopic detection and single-cell analysis. − In principle, existing E-nanopipettes can be sorted into two categories. One is the Faradaic type, which is based on conventional redox electrochemistry to generate quantitative Faraday currents with wired signal transduction. , For example, Pan et al. used a carbonized nanopipette for the detection of liposomes by the Faradaic current produced by oxidation/reduction of redox species .…”