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SUMMARY:Ultrathin Passivation for Improved Photoelectrochemical Water Oxida
 tion Catalysis
LOCATION:Virtual Research Seminar
TZID:America/Denver
DTSTART:20201201T160000
UID:2026-05-19-15-17-46@natsci.colostate.edu
DTSTAMP:20260519T151746
Description:Research Seminar\n\nOne of the challenges facing the world is t
 he need to fulfill the growing demand for energy via renewable resources w
 hile minimizing CO2 emissions. Photoelectrochemical water splitting into h
 ydrogen and oxygen is one such system capable of renewable solar energy co
 nversion. Previously\, we developed a water-oxidation photoanode consistin
 g of nanostructured SnO2 coated with a perylene diimide dye derivative (N\
 ,N´-bis(phosphonomethyl)-3\,4\,9\,10-perylenediimide\, PMPDI) and a CoOx 
 water oxidation catalyst. Surprisingly\, the addition of the CoOx catalyst
  results in an approximately 50% decrease in photocurrent due\, apparently
 \, to limitations imposed by recombination and trap states at the CoOx/SnO
 2 interface. Here\, we show the addition of an alumina overlayer deposited
  by atomic layer deposition (ALD) on the PMPDI dye designed to reduce reco
 mbination caused by the addition of CoOx. Under optimized alumina depositi
 on conditions\, steady-state photocurrent was improved approximately 3-fol
 d over the system without alumina. However\, the addition of the CoOx wate
 r-oxidation catalyst still results in a in photocurrent in comparison to t
 he SnO2/PMPDI/AlOx system without CoOx. The improvements afforded by the a
 lumina ALD\, the negative impact of the catalyst addition\, as well as the
  implications for future study of this and related systems will be discuss
 ed.\n\nZoom Link\n\nMeeting ID: 873 7512 6158\nPasscode: 9b01273 4:00 pm
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