Xu, Ruoyu;
Kang, Liqun;
Papanikolaou, Konstantinos G;
Wang, Bolun;
Marlow, Sushila;
He, Qian;
Zhang, Peng;
... Ryan Wang, Feng; + view all
(2022)
Improving the ORR Performance by Enhancing the Pt Oxidation Resistance.
Journal of Catalysis
, 416
pp. 311-321.
10.1016/j.jcat.2022.10.025.
Preview |
Text
1-s2.0-S0021951722004456-main.pdf Download (3MB) | Preview |
Abstract
Proton exchange membrane fuel cells require oxygen reduction catalysts with high activity and stability. Pt based alloy materials are most widely applied ORR catalyst due to its high intrinsic activity, but usually suffer from rapid deactivation as a result of particle agglomeration, detachment, Ostwald ripening and/or Pt dissolution. Here we investigate the degradation of the PdPt alloys via in situ X-ray absorption fine structure, Δμ analysis, identical location-electron microscopy and DFT calculations. We conclude that the origin of high activity and stability of the PdPt catalyst stems from the oxidation resistance of metallic Pt, forming mainly surface adsorbed O species at high potentials. Two stage degradation process are observed, showing an evolution of dynamic surface dependent ORR performance along with the deactivation process. The careful design of Pt alloy structure leads to controlled surface oxygen behaviours. This opens a new way to increase the lifespan of fuel cells and improve the Pt utilization efficiency.
| Type: | Article |
|---|---|
| Title: | Improving the ORR Performance by Enhancing the Pt Oxidation Resistance |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jcat.2022.10.025 |
| Publisher version: | https://doi.org/10.1016/j.jcat.2022.10.025 |
| Language: | English |
| Additional information: | Copyright 2022 The Author(s). This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Oxygen Reduction Reaction, Electron microscopy, X-ray absorption spectroscopy, Density functional calculations |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10159627 |
Archive Staff Only
 |
View Item |
