Currently elecrocatalyst evaluation for fuel cells is mainly conducted in either aqueous model systems (such as RDE, SFC) or single cell experiments (MEA) which both show severe metholodical limitations. On the one hand side, in aqueous model systems only idealized catalyst structures can be assessed and catalyst activity cannot be measured in relevant potential ranges due to systematic mass-transport limitations. On the other side, in MEA research effects from both electrodes can not be deconvoluted and experiments are time- and resource-intensive. Therefore, intermediary testing methods need to be introduced, which can combine the advantages of both approaches. Half-cell measurements using gas diffusion electrodes (GDE) are considered to be the most suitable method to close the gap between fundamental and applied electrocatalyst evaluation allowing high mass transport catalyst screening in relevant potential ranges and realistic electrode structures.
My research is focussed on developing novel GDE test setups for catalyst activity as well as stability investigations and the evaluation of promising catalyst materials. Thereby the main focus is put on fuel cell reactions (esp. oxygen reduction reaction) with low Pt or non-precious metal catalysts.
K. Ehelebe, D. Escalera-López, S. Cherevko
Current Opinion in Electrochemistry
B. Mayerhöfer, K. Ehelebe, F.D. Speck, M. Bierling, J. Bender, J.A. Kerres, K.J.J. Mayrhofer, S. Cherevko, R. Peach, S. Thiele
Journal of Materials Chemistry A
K. Ehelebe∗, J. Knöppel, M. Bierling, B. Mayerhöfer, T. Böhm, N. Kulyk, S. Thiele, K.J.J. Mayrhofer, S. Cherevko∗
Angewandte Chemie International Edition
K. Ehelebe*, T. Ashraf, S. Hager, D. Seeberger, S. Thiele, S. Cherevko*
K. Ehelebe,* D. Seeberger, M.T.Y. Paul, S. Thiele, K.J.J. Mayrhofer, S. Cherevko*
Journal of The Electrochemical Society
|2016-2017||Diploma thesis at Fraunhofer IFAM Dresden (Development of electrochemical flow-reactor for CO2 reduction to formate)|
|2014||Research stay at Universidad Nacional de Colombia (Pyrolysis of organic waste materials)|
|2010-2017||Process Engineering at TU Dresden|
|2018||Electrochemistry 2018 - Metrohm Poster Award|
|2020||ISE online 2020 - Poster Award|