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SUMMARY:Nanoscale imaging of electrochemical energy conversion and storage 
 systems
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20210922T160000
UID:2026-05-05-22-02-35@natsci.colostate.edu
DTSTAMP:20260505T220235
Description:About the Seminar:\n\nEnergy needs and environmental trends dem
 and a large-scale transition to clean\, renewable energy. Nanostructured m
 aterials are poised to play an important role in this transition. However\
 , nanomaterials are chemically and structurally heterogeneous in size\, sh
 ape\, and surface structural features. My research group focuses on unders
 tanding the correlation between nanoparticle chemistry/structure and funct
 ional properties. The first part of my talk will focus on elucidating char
 ge storage mechanisms in nanoscale materials\, which underlies the perform
 ance of electrochemical technologies such as batteries and smart windows. 
 I will discuss our high-throughput electro-optical imaging method that mea
 sures the battery-like and capacitive-like (i.e.\, pseudocapacitive) charg
 e storage contributions in single metal oxide nanoparticles. I will presen
 t our recent single particle-level measurements that show (1) individual p
 articles exhibit different charge storage mechanisms at the same applied p
 otential and (2) particle size-dependent pseudocapacitive charge storage p
 roperties. The second part of my talk will focus on solar energy conversio
 n using ultrathin semiconductors such as monolayer-thick (ML) two-dimensio
 nal (2D) materials such as MoS2 and WS2. ML semiconductors represent the u
 ltimate miniaturization limit for lightweight and flexible power generatio
 n applications. However\, the underlying solar energy conversion processes
  in 2D materials is not entirely understood. We developed a correlated las
 er reflection and scanning photocurrent microscopy approach to study how l
 ayer thickness and surface structural features (edges versus basal planes)
  influence solar energy conversion efficiency. I will highlight our photoc
 urrent microscopy study that revealed how layer stacking order in heteroju
 nction photoelectrodes influences charge separation\, transport\, and reco
 mbination pathways.\n\nAbout the Speaker:\n\nJustin earned his B.S. degree
  in 2006 from the State University of New York (SUNY)-Binghamton. His unde
 rgraduate honors thesis work under the direction of Dr. David Doetschmann 
 focused on the degradation mechanisms of chemical warfare agents within ze
 olite pores. Justin traveled west to graduate school and earned his PhD un
 der the direction of Dr. Bruce A. Parkinson at Colorado State University (
 CSU). Justin studied the photoelectrochemical energy conversion properties
  of semiconductor nanocrystals and light absorbing polymers on single crys
 tal electrode surfaces. In 2011\, Justin traveled back to NY to join Prof.
  Peng Chen’s lab at Cornell University. Justin’s NSF ACC-F Postdoctora
 l Fellow work integrated single molecule imaging methods in the area of ph
 otoelectrochemistry. Justin returned to CSU in 2016 as an Assistant Profes
 sor of Chemistry and the School of Advanced Materials Discovery (SAMD) and
  his work has been recognized with the Air Force Young Investigator Award\
 , NSF CAREER Award\, and DOE Early Career Award. Justin was also named a S
 cialog Fellow in Advanced Energy Storage.\n\nGroup Website 4:00 pm
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