Electrochemical Imaging Techniques for Nanoparticle Characterization

Electrochemical imaging techniques enable high-resolution mapping of the electrochemical activity and surface structure of individual nanoparticles. Single-entity approaches break down complex colloidal ensembles into discrete units, revealing heterogeneity in reactivity, catalytic turnover and interfacial dynamics. These methods pair microelectrodes or nanopipette probes with sensitive current–time or scanning voltammetric measurements to construct spatially and temporally resolved electrochemical maps. Central to these advances are scanning electrochemical cell microscopy (SECCM), nanopipette-based electrochemical imaging and impact electrochemistry, all of which allow direct correlation between topography, adsorption behaviour and electron-transfer kinetics on the nanoscale. Such capabilities underpin rational design of nanoparticle catalysts, sensing platforms and energy storage materials by identifying active facets, quantifying adsorption energies and monitoring dynamic interactions at liquid–solid interfaces.

Research from Nature Portfolio

Recent studies have generalised scaling relations to predict adsorption energies of nanoparticles at ultramicroelectrode interfaces, guiding the interpretation of dynamic current–time records during individual nanoparticle oxidations. By restraining stochastic nanoparticle trajectories near the electrode surface, researchers have obtained surface-confined current profiles that enhance resolution of size measurements in mixed-sample systems. This work demonstrates that modest changes in nanoparticle–electrode interactions can dramatically alter current-trace signatures, paving the way for high-precision characterisation of heterogeneous nanoparticle populations in electrochemical environments.

Electrochemical Imaging Techniques for Nanoparticle Characterization publication trend

The graph below shows the total number of articles in electrochemical imaging techniques for nanoparticle characterization across all publications each year (not limited to Nature Index journals).

Technical terms

Scanning Electrochemical Cell Microscopy (SECCM): A scanning probe technique that uses a nanopipette droplet cell to map local electrochemical activity and topography with submicrometre resolution.

Single-entity electrochemistry: The study of electrochemical responses at the level of individual nanoparticles or molecular units, revealing heterogeneity obscured in ensemble measurements.

Surface-confined current trace: A current–time profile recorded when a nanoparticle remains transiently localized at the electrode interface, yielding size and kinetic information.

Turnover frequency (TOF): A measure of catalytic activity defined as the number of substrate molecules converted per active site per unit time.

References

1. Scanning electrochemical cell microscopy: A natural technique for single entity electrochemistry. Current Opinion in Electrochemistry (2020).
2. Correlative Electrochemical Microscopy of Li‐Ion (De)intercalation at a Series of Individual LiMn2O4 Particles. Angewandte Chemie International Edition (2019).
3. Scanning Electrochemical Cell Microscopy Investigation of Single ZIF‐Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media. Angewandte Chemie International Edition (2019).
4. Tracking motion trajectories of individual nanoparticles using time-resolved current traces. Chemical Science (2017).
5. Exploring dynamic interactions of single nanoparticles at interfaces for surface-confined electrochemical behavior and size measurement. Nature Communications (2020).