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SUMMARY:Single MoS2 Nanoflake Photoelectrochemistry Reveals Intra-nanoflake
  Doping Heterogeneity
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20211015T160000
UID:2026-04-24-16-21-46@natsci.colostate.edu
DTSTAMP:20260424T162146
Description:Independent Research Proposal:\nTransition metal dichalcogenide
  (TMD) nanoflake thin films are attractive electrode materials for photoel
 ectrochemical (PEC) solar energy conversion and sensing applications\, but
  their photocurrent quantum yields are generally lower than bulk TMD elect
 rodes. In this seminar\, I will discuss a single nanoflake photocurrent ma
 pping approach to reveal how doping heterogeneity limits ensemble-level P
 EC performance. Photocurrent mapping of MoS2 nanoflakes exfoliated from na
 turally occurring bulk crystals revealed the presence of n- and p-type dom
 ains within the same nanoflake. At the single domain-level\, the n- and p
 -type domains were equally efficient for iodide oxidation and tri-iodide 
 reduction.. This single domain-level behavior helps to explain the poor pe
 rformance at the ensemble-level. Individual n- and p-type domains oppose e
 ach other when illuminated\, resulting in low to zero photocurrent. The d
 oping heterogeneity effect is likely due to non-ideal stoichiometry\, wher
 e p-type domains are S-rich according to XPS measurements. While this dopi
 ng heterogeneity effect limits photoanode or photocathode performance\, th
 ese findings open the possibility to synthesize efficient TMD nanoflake ph
 otocatalysts with well-defined lateral p- and n-type domains for enhanced 
 charge separation. 4:00 pm
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