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SUMMARY:Mapping Photoelectrochemical Activity of Single Transition Metal Di
 chalcogenide Nanosheets
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20203101T000000
UID:2026-04-28-15-22-29@natsci.colostate.edu
DTSTAMP:20260428T152229
Description:Literature Seminar\nTransition metal dichalcogenides (TMDs)\, d
 ue to their unique optoelectrical properties\, have been studied for decad
 es. These van der Waals semiconductors are stable under electrochemical co
 nditions while having a desirable band gap suitable for absorbing a wide r
 ange of solar wavelengths without wasting much energy as seen in solar ene
 rgy conversion devices. Mechanical exfoliation of these materials yielding
  ultrathin thickness has prompted a renewed interest in recent years. Of c
 ourse\, there are still fundamental questions being asked about their (pho
 to)electrochemical behavior. Recent studies have shown that ensemble measu
 rements are not an accurate representation of their observed behavior. Mor
 e specifically\, structure-function relationships are being investigated o
 n individual nanoflakes. Scanning electrochemical cell microscopy (SECCM) 
 is a recently developed technique that allows for single nanoflake measure
 ments that would otherwise be hidden in ensemble measurements. Because of 
 its configuration\, SECCM allows for simultaneous topographical and electr
 ochemical measurements at nanoscale resolution with fast sampling rates. H
 ill et al. uses this technique to study the effect of step/edge height on 
 the photocurrent in an inner and outer sphere redox couple. Their findings
  support that step/edge height determines whether they are beneficial or d
 etrimental to charge carrier generation and collection. Additional modelin
 g shows the effect of basal plane thickness on photocurrent based on simul
 ations with potential profiles within the materials. 4:00 pm
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