Journal article
Direct and continuous strain control of catalysts with tunable battery electrode materials
Department of Applied Physics, Stanford University, Stanford, CA 93205, USA.1
Department of Mechanical Engineering, Stanford University, Stanford, CA 93205, USA.2
SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.3
SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.4
Department of Material Science and Engineering, Stanford University, Stanford, CA 94305, USA.5
Department of Physics, Stanford University, Stanford, CA 94305, USA.6
Department of Material Science and Engineering, Stanford University, Stanford, CA 94305, USA. yicui@stanford.edu.7
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.8
We report a method for using battery electrode materials to directly and continuously control the lattice strain of platinum (Pt) catalyst and thus tune its catalytic activity for the oxygen reduction reaction (ORR). Whereas the common approach of using metal overlayers introduces ligand effects in addition to strain, by electrochemically switching between the charging and discharging status of battery electrodes the change in volume can be precisely controlled to induce either compressive or tensile strain on supported catalysts.
Lattice compression and tension induced by the lithium cobalt oxide substrate of ~5% were directly observed in individual Pt nanoparticles with aberration-corrected transmission electron microscopy. We observed 90% enhancement or 40% suppression in Pt ORR activity under compression or tension, respectively, which is consistent with theoretical predictions.
| Language: | English |
|---|---|
| Publisher: | American Association for the Advancement of Science |
| Year: | 2016 |
| Pages: | 1031-1036 |
| ISSN: | 10959203 and 00368075 |
| Types: | Journal article |
| DOI: | 10.1126/science.aaf7680 |
