Identification of Active Edge Sites for Electrochemical H <sub>2</sub> Evolution from MoS <sub>2</sub> Nanocatalysts
Thomas F. JaramilloCenter for Atomic-scale Materials Design, Department of Physics, Nano-DTU, Technical University of Denmark, DK-2800 Lyngby, DenmarkKristina P. JørgensenCenter for Atomic-scale Materials Design, Department of Physics, Nano-DTU, Technical University of Denmark, DK-2800 Lyngby, DenmarkJacob BondeCenter for Atomic-scale Materials Design, Department of Physics, Nano-DTU, Technical University of Denmark, DK-2800 Lyngby, DenmarkJane H. NielsenCenter for Atomic-scale Materials Design, Department of Physics, Nano-DTU, Technical University of Denmark, DK-2800 Lyngby, DenmarkSebastian HorchCenter for Atomic-scale Materials Design, Department of Physics, Nano-DTU, Technical University of Denmark, DK-2800 Lyngby, DenmarkIb ChorkendorffCenter for Atomic-scale Materials Design, Department of Physics, Nano-DTU, Technical University of Denmark, DK-2800 Lyngby, Denmark
2007en
ABI
Abstract
The identification of the active sites in heterogeneous catalysis requires a combination of surface sensitive methods and reactivity studies. We determined the active site for hydrogen evolution, a reaction catalyzed by precious metals, on nanoparticulate molybdenum disulfide (MoS2) by atomically resolving the surface of this catalyst before measuring electrochemical activity in solution. By preparing MoS2 nanoparticles of different sizes, we systematically varied the distribution of surface sites on MoS2 nanoparticles on Au(111), which we quantified with scanning tunneling microscopy. Electrocatalytic activity measurements for hydrogen evolution correlate linearly with the number of edge sites on the MoS2 catalyst.
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