For many decades to come we shall still rely on fossil resources and as new sustainable energy sources emerge there will be a need for averaging out the temporal variation. Both schemes will require extensive use of heterogeneous catalysts and the need for new electro-and photo-catalysts will increase. In order to improve catalytic reactions by a rational approach it is mandatory to understand which step in the process that is the rate-limiting one, and what is the nature of the site where it takes place . In other words, what is the relation between reactivity and structure/size of nanoparticles? In this presentation we will demonstrate a number of surface chemistry reactions, in which a combination of theoretical insight and interplay between experimental surface science on well-defined single crystal surfaces, model systems of mass selected nanoparticles deposited on planar surfaces, and measurements on supported catalysts have made such an identification possible [2,3]. Gaining fundamental insight allows for prediction power on what should be done in order to improve the catalytic activity and how we optimize their presence? In particular the importance of particle size will be elucidated both for mass selected clusters deposited on planar surfaces, where they can be investigated by STM and tested for activity in our newly developed micro-reactor platform . Furthermore, we will also demonstrate that this principle can be extended to control selectivity and optimization of electro-and photo-chemical reactions, for which we are exploring alternative catalystfor either reducing [5,6] or entirely replacing the scarce and expensive Platinum group catalysts [7-9] or ultimately designing entirely new processes like for synthesis of H2O2.
- F.J. Perez-Alonso, D.N. McCarthy, A. Nierhoff, C. Strebel I. E. L. Stephens, J.H. Nielsen and I. Chorkendorff, Angew. Chem. Int. Ed. 51 (2012) 4641.
- I. E.L. Stephens, A. S. Bondarenko, U.G. Andersen, J. Rossmeisl, and I Chorkendorff, Energy Environ. Sci., 5 (2012) 6744.
- Y. Hou, B. L. Abrams, P-C.K. Vesborg, M. E. Björketun, K. Herbst, L. Bech, A. M. Setti, C. D. Damsgaard, T. Pedersen, O. Hansen, J. Rossmeisl, S. Dahl, J. K. Nørskov, and I. Chorkendorff, Nature Materials 10 (2011) 434-43
- T. Andersen, R. Jensen, M. K. Christensen, T. Pedersen, O. Hansen, and I. Chorkendorff, Rev. Sci. Inst. 83 (2012) 075105.
- A. S. Bondarenko, A. S. Varela, M. Karamad, F. Calle-Vallejo, L. Bech, F.J. Perez-Alonso, J. Rossmeisl, I.E.L. Stephens, and I. Chorkendorff, Angew. Chem. Int. Ed., 51 (2012) 11845.
- M. Escudero-Escribano,A. Verdaguer-Casadevall, P. Malacrida, U. Grønbjerg, B. P. Knudsen, A. K. Jepsen, J. Rossmeisl, I. E. L. Stephens, and I. Chorkendorff, J. Am. Chem. Soc. 134 (2012) 16476-16479.
- A. B. Laursen, S. Kegnæs, S. Dahl, and I. Chorkendorff, Energy Environ. Sci., 5 (2012) 5577-5591.
- B. Seger, A. B. Laursen, P. C.K. Vesborg, T. Pedersen, O. Hansen, S. Dahl, and I. Chorkendorff, Angew. Chem. Int. Ed., 51 (2012) 9128–9131
- B. Seger, A. B. Laursen, T. Pedersen, P. C.K. Vesborg, O. Hansen, and I. Chorkendorff, ” Using TiO2 as a Conductive Protective Layer for Photo-cathodic H2 evolution”, J. Am. Chem. Soc. J. Am. Chem. Soc. 2013 135 (2013) 1057-64
- S. Siahrostami, A. Verdaguer-Casadevall, M. Karamad, P. Malacrida, B. Wickman, M. Escudero-Escribano, I. Chorkendorff, I. Stephens, J. Rossmeisl, ”Enabling sustainable O2electroreduction to H2O2 by catalyst design”Accepted Nature Mat. OCT (2013).
The ultimate goal is to capitalize on understanding the fundamental interactions taking place at the surface-gas or surface-liquid interface to design, synthesize, and test new functional materials. These materials can be used in catalysis related to energy production, energy conversion, and environmental protection. Thus he common denominator in our research is the basic surface and reactivity properties of nanoparticles which allows for a deep insight, whether they are used for heterogeneous catalysis, electrocatalysis and photocatalysis
Awards and Honors:
- 2000 The Ulrik and Marie Brinch award.
- 2001 Elected member of the Danish Natural Science Academy (DNA).
- 2001 Elected member of The Academy for Technical Sciences (ATV).
- 2007 The Ingeborg and Leo Dannin’s Prize for Natural Science Research.
- 2012 Chalmers Jubilee Distinguished Professor, Chalmers University of Technology, Sweden
- 2013 Consulting Professor, SUNCAT, SLAC, Stanford University, Palo Alto, USA.