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SUMMARY:New catalyst concepts for the electrochemical conversion of CO2
DTSTART:20171130T103000
DTEND:20171130T113000
DTSTAMP:20260510T025759Z
UID:67f200bf4ef66a8447a0c46a72c8fb21ccb2d609e247420f197fa7b9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Peter Broekmann\, Department of Chemistry and Biochemistry
 \, University of Bern\, Switzerland\n \nChE-605 - Highlights in Energy Re
 search seminar series\n\nThe electrochemical conversion of CO2 into produc
 ts of higher value (e.g. CO\, formate\, ethanol\, n-propanol) can be consi
 dered as a seminal approach that has the technological potential of contri
 buting to a future closing of the anthropogenic carbon cycle. Such CO2 ele
 ctroreduction process (denoted as CO2RR) offers not only the unique chance
  to reduce the amount of environmentally harmful CO2\, it provides in addi
 tion means of storing intermittently produced excesses of electricity orig
 inating from renewables like wind\, solar and hydro sources.\n\nMajor chal
 lenges that currently prevent such electrochemical CO2 conversion technolo
 gy from being implemented into industrial applications are related to the 
 enormous overpotentials needed for CO2 activation\, thus typically resulti
 ng into a poor energy efficiency of the entire full cell-level process. An
 other key challenge of the process development remains the product selecti
 vity. Among the vast number of materials screened so far\, it is Cu which 
 deserves particular attention since it is the only catalyst which is capab
 le to convert CO2 into hydrocarbons and alcohols in considerable amounts. 
 Crucial for the performance of the Cu catalysts is their pre-treatment\, e
 .g. by thermal annealing\, exposure to oxygen plasma\, electrodeposition\,
  and electrodeposition. This pretreatment provides not only means of formi
 ng catalytically active sites and surface textures but creates in addition
  particular catalyst morphologies on various length scales that are needed
  to guide the CO2RR into the desired direction. \n\nAn additive-assisted 
 metal foam electrodeposition can be considered as a promising approach tow
 ards design and production of novel high-surface area CO2RR catalysts.[1-2
 ] For selected examples\, it will be demonstrated that oxide-derived Cu fo
 am catalysts can reach Faradaic efficiencies of up to 25% for the producti
 on of highly valuable C2 and C3 alcohols. Identical location (IL) SEM/TEM 
 investigations in combination with operando Raman and EXAFS/XANES measurem
 ents clearly prove that the actually active catalyst forms only under reac
 tive conditions during an ongoing CO2RR. Particularly important for the lo
 ng-term stability of the Cu catalysts is the complete suppression of the C
 1 pathway of methane production.          \n \nReferences:\n[1]
   A. Dutta\, M. Rahaman\, N. C. Luedi\, M. Mohos\, P. Broekmann\, ACS Cat
 al. 6 (2016) 3804-3814\n[2]  A. Dutta\, M. Rahaman\, M. Mohos\, A. Zanett
 i\, P. Broekmann\, ACS Catal. 7 (2017) 5431–5437
LOCATION:I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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