About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Self-organizing Nano-architectured Materials
|
Presentation Title |
Coarsening Mechanisms in Surface-doped Nanoporous Metals |
Author(s) |
Jesse Ko, Ian Mccue, Zhiyong Xia |
On-Site Speaker (Planned) |
Ian Mccue |
Abstract Scope |
Due to their high surface-to-volume ratios, nanostructured catalysts offer benefits in electrochemical energy storage and conversion technologies. However, these materials have intrinsically metastable morphologies and degrade via coarsening during service. One potential mitigation strategy is to introduce impurities on the catalyst surface that inhibit diffusional transport. While there have been instances of utilizing this strategy to successfully improve catalyst stability, there is no guiding principle regarding what fraction of impurities are required. In order to answer this question, we investigated the impact of trace surface dopants on coarsening in a representative nanostructured catalyst material: nanoporous platinum. Through a combination of experimental and computational metrics, we determined how the coarsening rate and surface site density was impacted by trace (2-8%) Ir impurities. Insights from this work will have a measurable impact on the effort to bridge the gap between highly active and highly stable catalyst materials. |
Proceedings Inclusion? |
Undecided |
Keywords |
Nanotechnology, Energy Conversion and Storage, Modeling and Simulation |