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SUMMARY:The effect of morphology and process conditions on the performance
  of Cu based electrodes in electrochemical CO2 reduction
DTSTART:20161110T160000
DTEND:20161110T170000
DTSTAMP:20260405T151851Z
UID:39fa4de0d3ddc3936c2673501b63424e957598f4155a331d1a3a9612
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Guido Mul\, University of Twente\, The Netherlands\nElec
 trochemistry is a technology that sees a revival in the number of applicat
 ions and publications\, because of fluctuations in renewable electricity p
 roduction\, with periods of over-capacity\, resulting in low\, or even neg
 ative electricity prices. To utilize this electricity the PCS group of the
  University of Twente conducts research to effectively convert CO2.\n\nThr
 ee aspects of Cu catalyzed CO2 reduction will be discussed during the pres
 entation.\n\ni) The structure and oxidation state of Cu2O derived Cu elect
 rodes when active in CO2 reduction will be addressed1. It will be shown th
 at the selectivity of CO2 reduction largely depends on the thickness of th
 e parent Cu2O film\, rather than on the initial crystal orientation. It wi
 ll also be shown by online mass spectroscopy studies combined with X-ray d
 iffraction and Raman data that reduction of the Cu2O films in the presence
  of CO2\, generating a nanoparticulate Cu morphology\, occurs prior to the
  production of hydrogen\, CO\, and hydrocarbons.\n\nii) The effect of proc
 ess conditions on the electrocatalytic selectivity and stability will be d
 iscussed. An identical electrode covered with copper nanoparticles can yie
 ld either predominantly ethylene or methane. Methane is favored at high KH
 CO3 electrolyte concentration (0.5 M)\, and low CO2 pressure\, whereas eth
 ylene is formed predominantly at low KHCO3 electrolyte concentration (0.1 
 M) and high CO2 pressure (9 atm)2. These observations will be explained on
  the basis of differences in pH near the electrode surface. \n\niii) A me
 ans to prevent mass transport limitations in electrocatalytic conversion o
 f CO2 to CO will be demonstrated3. The cartoon highlights a novel electrod
 e design in which gas is purged through a porous wall of a sintered metal 
 tube (hollow fiber). The excellent results obtained by using such morpholo
 gy will be discussed.  \n\n1.         R. Kas\, R. Kortlever\, A. 
 Milbrat\, M. T. M. Koper\, G. Mul and J. Baltrusaitis\, Phys. Chem. Chem. 
 Phys.\, 2014\, 16\, 12194-12201.\n2.         R. Kas\, R. Kortlever
 \, H. Yilmaz\, M. T. M. Koper and G. Mul\, ChemElectroChem\, 2015\, 2\, 35
 4-358.\n3.         R. Kas\, K. K. Hummadi\, R. Kortlever\, P. de W
 it\, A. Milbrat\, M. W. J. Luiten-Olieman\, N. E. Benes\, M. T. M. Koper a
 nd G. Mul\, Nat. Commun.\, 2016\, 7\, 7.\n\nRecep Kas1\, Ruud Kortlever2\,
  Nieck E. Benes3\, Marc T.M. Koper2 and Guido Mul1\n\n1 PhotoCatalytic Syn
 thesis Group\, MESA+ Institute for Nanotechnology\, Faculty of Science and
  Technology\, University of Twente\, P.O. Box 217\, 7500 AE Enschede\, The
  Netherlands.\n2Leiden Institute of Chemistry\, Leiden University\, Einste
 inweg 55\, P.O. Box 9502\, 2300 RA Leiden\, The Netherlands \n3Inorganic 
 Membranes Group\, Faculty of Science and Technology\, MESA+ Institute for 
 Nanotechnology\, University of Twente\, P.O. Box 217\, 7500 AE Enschede\, 
 The Netherlands\n\n \n\nBio: Guido Mul obtained his masters degree in che
 mistry with specialization in heterogeneous catalysis (Prof. Geus) from Ut
 recht University in 1992. He received his PhD in 1997 fr om the Delft Univ
 ersity of Technology on the in situ DRIFT analysis of catalytic oxidation 
 of (diesel) soot \, research conducted under supervision of Prof. Jacob Mo
 ulijn. After a Post -Doc position at SRI -International (Stanford Research
  Institute) in California\, USA (1997- 1999)\, he was awarded a fellowship
  of the KNAW (Royal Netherlands Academy of Arts and Sciences) . This allow
 ed him to determine the mechanism of oxidation reactions\, using an integr
 ated approach based on Infrared and Raman spectroscopies and transient kin
 etics \, again at the Delft University of Technology (TUD). He was appoint
 ed associate professor at TU Delft in 2007\, where his research continued 
 with developing/evaluating spectroscopies (ATR\, Raman) for analyses of li
 quid phase (photo) cataly tic processes.\n\nHe was appointed full professo
 r to conduct research in the field of ‘Photocatalytic Synthesis’ at th
 e University of Twente in 2010\, with research activities in photocatalysi
 s and electrocatalysis for environmental applications\, including water an
 d air decontamination\, and CO 2 conversion to store renewable electricity
  in the form of fuel -type molecules. Furthermore\, development and evalua
 tion of photo- and electrocatalytic processes for conversion of methane\, 
 are part of his activities . Research is focused on studying catalyst stru
 cture activity correlations by among others Infrared and Raman spectroscop
 y\, as well as optimization of process conditions and reactors for photo- 
 or electrochemical conversions.\n
LOCATION:Emosson\, EPFL  Valais
STATUS:CONFIRMED
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