Ib Chorkendorff1

1, DTU Denmark, Kongens Lyngby, , Denmark

In this presentation, I will give an overview of some our recent progress in making nanoparticles alloys and intermetallic compounds for catalysis, particularly in relation to conversion of sustainable energy [1]. First, we shall discuss new catalysts for electrochemical Oxygen Reduction Reaction [2, 3], which is really the limiting reaction in Proton Exchange Membrane Fuel Cells. Here we have proved that it is possible to make mass-selected nanoparticles of the Pt-early transition alloys like PtY alloys [4] and PtGd alloys [5]. We shall demonstrate that as similar approach can be used for studying size dependence and efficiency for catalysts related to water splitting [6-7] and evaluate the scalability of scarce and expensive elements like Platinum and Ruthenium. Similarly, size dependence and isotope labelled experiments will be presented for NiFe nanoparticles for oxygen evolution under alkaline conditions [8]. Here we shall demonstrate a new principle for dynamic detection of gas evolution [9]. This has also been used to investigate electrochemical CO hydrogenation on mass-selected Copper nanoparticles to study the dynamical influence of surface oxygen on the selectivity for methane/ethene production [10].

1) Z. W She, J. Kibsgaard, C. F. Dickens, I. Chorkendorff, J. K. Nørskov, T. F. Jaramillo, Science (2017) 355.
2) J. Greeley, I.E.L. Stephens, A.S. Bondarenko, T. P. Johansson, H. A. Hansen, T. F. Jaramillo, J. Rossmeisl, I. Chorkendorff, J. K. Nørskov,
Nature Chemistry. 1 (2009) 522.
3) M. Escudero-Escribano, P. Malacrida, M- Hansen, U. G. Vej-Hansen, A. Velázquez-Palenzuela V. Tripkovic, J. Schøitz, J. Rossmeisl, I. E.L.
Stephens, I. Chorkendorff, Science 352 (2016) 73.
4) P. Hernandez-Fernandez, F. Masini, D. N. McCarthy, C. E. Strebel, D. Friebel, D. Deiana, P. Malacrida, A. Nierhoff, A. Bodin, A. M. Wise, J.
H. Nielsen, T. W. Hansen, A. Nilsson, I. E.L. Stephens, I. Chorkendorff, Nature Chemistry 6 (2014) 732.
5) A. Velázquez-Palenzuela, …. D. Friebel, A. Nilsson, I. E.L. Stephens, I. Chorkendorff, J. Catal. 328 (2015) 297.
6) E. Kemppainen, A. Bodin, … C. K. Vesborg, J. Halme, O. Hansen, P.D. Lund and I. Chorkendorff, Energy & Environmental Science, 8 (2015)
7) E. A. Paoli, F. Masini, R. Frydendal, D. Deiana, C. Schlaup, M. Malizia, S. Horch, I. E.L Stephens, I. Chorkendorff, Chemical Science, 6
(2015) 190.
8) C. Roy, …,J. Kibsgaard, I. E. L. Stephens, and I. Chorkendorff; In Preparation (2017).
9) D. T. Bøndergaard, T. Pedersen, O. Hansen, I Chorkendorff and P. C. K. Vesborg, Rev. Sci. Inst. 86 (2015) 075006.
10) S. B. Scott, D. B. Trimarco, …. P. C. K. Vesborg, Jan Rossmeisl, and I. Chorkendorff, In Preparation (2017).