Eliminating dissolution of platinum-based electrocatalysts at the atomic scale
Marković, Nenad M.
Article (Accepted Version)
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A remaining challenge for deployment of proton-exchange membrane fuel cells is the limited durability of Pt-nanoscale materials that operate at high voltages during the cathodic oxygen reduction reaction. In this work, atomic-scale insight into well-defined single crystalline, thin-film, and nanoscale surfaces exposed Pt dissolution trends that governed the design and synthesis of durable materials. A newly defined metric, intrinsic dissolution, is essential to understanding the correlation between the measured Pt loss, surface structure, size and ratio of Pt-nanoparticles in carbon support. It was found that utilization of Au underlayer promotes ordering of Pt surface atoms towards (111)- structure, while Au on the surface selectively protects low-coordinated Pt sites. This mitigation strategy was applied towards 3 nm Pt3Au/C nanoparticles, resulting in elimination of Pt dissolution in liquid electrolyte, including 30-fold durability improvement vs. 3 nm Pt/C over extended po...tential range up to 1.2 V.
Keywords:Electrocatalysis / Fuel cells / Materials for energy and catalysis
Source:Nature Materials, 2020, 19, 1207-1214
- Nature Publishing Group
- US Department of Energy (DOE), contract no. DE-AC02-06CH11357
- US Department of Energy (DOE), grantant DE-FG02-05ER15731
- US Department of Energy (DOE), contract no. DE-AC02-05CH11231
- This is the peer-reviewed version of the article: Lopes, P.P., Li, D., Lv, H. et al. Eliminating dissolution of platinum-based electrocatalysts at the atomic scale. Nat. Mater. 19, 1207–1214 (2020). https://doi.org/10.1038/s41563-020-0735-3
- The published version of the article: https://cer.ihtm.bg.ac.rs/handle/123456789/3699