| AVS 63rd International Symposium & Exhibition | |
| Surface Science | Tuesday Sessions |
| Session SS1+AS+HC+NS-TuM |
| Session: | Surface Dynamics, Non-Adiabaticity, and Theory and Modeling of Surface and Interfacial Phenomena |
| Presenter: | Hyosun Lee, KAIST & IBS, Republic of Korea |
| Authors: | H. Lee, KAIST & IBS, Republic of Korea I. Nedrygailov, IBS & KAIST, Republic of Korea Y.K. Lee, KAIST & IBS, Republic of Korea C. Lee, KAIST & IBS, Republic of Korea H. Choi, Electronics and Telecommunications Research Institute (ETRI), Republic of Korea J.Y. Park, Institute for Basic Science (IBS) & Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea |
| Correspondent: | Click to Email |
Direct detection of hot electrons produced by exothermic reactions on catalysts is an effective strategy to quantify the non-adiabatic energy transfer during the elementary steps of the surface reactions, which provides an insight of the catalytic activity.1,2 In particular, hot electron dynamics at the surface of metal nanoparticles (NPs) with precisely controlled shape and size is a challenge as well as a key issue in the real-world catalyst system. Herein, we show a novel scheme of graphene catalytic nanodiode composed of a Pt NPs array on graphene/TiO2 Schottky nanodiode, which allows detection of hot electron flows induced by hydrogen oxidation on Pt NPs. By analyzing the correlation between the turnover rate (catalytic activity) and hot electron current (chemicurrent) measured on the graphene catalytic nanodiodes, we demonstrate that the catalytic nanodiodes utilizing a single graphene layer for electrical connection of Pt NPs are beneficial for the detection of hot electrons due to not only atomically thin nature of graphene but also reducing the height of the potential barrier existing at the Pt NPs/graphene interface. Thereby, the graphene catalytic nanodiodes offer an effective and easy to use approach to study mechanisms of chemical energy conversion in various heterogeneous system, even including composite catalysts with carbon-based supports.
References
1. H. Lee, I. I. Nedrygailov, Y. K. Lee, C. Lee, H. Choi, J. S. Choi, C. Choi, J. Y. Park, Nano Lett. 16 (2016) 1650-1656.
2. H. Lee, I. I. Nedrygailov, C. Lee, G. A. Somorjai, J. Y. Park, Angew. Chem. Int. Ed. 54 (2015) 2340-2344.