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SUMMARY:Correlative Electrochemical Multi-Microscopy: Building an Understan
 ding of Electrochemical Interfaces From Local to Global
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20199101T000000
UID:2026-04-18-05-49-58@natsci.colostate.edu
DTSTAMP:20260418T054958
Description:About the Seminar:\n\nElectrodes used in electrochemistry\, wit
 h applications in electrocatalysis\, energy storage\, sensor technologies 
 and corrosion\, show heterogeneity and complexity on a range of lengthscal
 es. The activity of these electrodes is often determined by old classical 
 macroscopic electrochemical techniques that provide the average response o
 f an electrode and are unable to detect and analyze spatially heterogeneou
 s fluxes that govern the electrode response. We advocate new approaches to
  study electrochemical and electrocatalytic phenomena\, whereby the activi
 ty of an electrode is visualized by electrochemical microscopy in the form
  of “activity maps” and “potentiodynamic movies”. These quantitati
 ve data are then related to co-located electrode structure from complement
 ary high-resolution microscopy and spectroscopy techniques applied in the 
 same area of the electrode. This correlative electrochemical multi-microsc
 opy approach seeks to relate electrode structure to activity clearly and u
 nambiguously. In our work\, scanning electrochemical cell microscopy (SECC
 M) and scanning ion conductance microscopy (SICM) are used primarily for t
 he acquisition of electrochemical activity-topography maps at electrodes w
 ith nanoscale spatial resolution\, coupled with a wide range of microscopy
  techniques\, spanning electron microscopy and electron backscatter diffra
 ction\, micro-Raman spectroscopy and atomic force microscopy to pinpoint p
 articular active sites in the same area. This is a general platform for in
 vestigating electrochemical interfaces\, and illustrative examples of this
  approach include: layered materials\, structurally and/or compositionally
  heterogeneous surfaces such as polycrystalline metals\, screen printed el
 ectrodes and conducting polymers\, and ensemble electrodes comprising of n
 anoparticles on an electrode support surface\, with applications in electr
 ocatalysis and energy storage (batteries).\n\nA key thesis of our work is 
 that complex electrode surfaces can be broken down and studied as set of s
 impler “single entities” (e.g.\, individual steps\, terraces\, defects
 \, crystal facets\, grain boundaries\, single particles). The resulting na
 noscale understanding of electrochemical reactivity can then be used to cr
 eate scalable models for electrochemical interfaces that will ultimately f
 acilitate the rational design of functional (electro)materials.\n\nMany ta
 lented people at Warwick and elsewhere have contributed to our work in thi
 s area and will be acknowledged throughout.\n\n&nbsp\; 4:00 pm
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