Stabilization of Pt monolayer catalysts under harsh conditions of fuel cells
Abstract
We employed density functional theory (DFT) to explore the stability of core (M = Cu, Ru, Rh, Pd, Ag, Os, Ir, Au)-shell (Pt) catalysts under harsh conditions, including solutions and reaction intermediates involved in the oxygen reduction reaction (ORR) in fuel cells. A pseudomorphic surface alloy (PSA) with a Pt monolayer (Pt1ML) supported on an M surface, Pt1ML/M(111) or (001), was considered as a model system. Different sets of candidate M cores were identified to achieve a stable Pt1ML shell depending on the conditions. In vacuum conditions, the Pt1ML shell can be stabilized on the most of M cores except Cu, Ag, and Au. The situation varies under various electrochemical conditions. Depending on the solutions and the operating reaction pathways of the ORR, different M should be considered. Pd and Ir are the only core metals studied, being able to keep the PtML shell intact in perchloric acid, sulfuric acid, phosphoric acid, and alkaline solutions as well as under the ORR conditions via different pathways. Ru and Os cores should also be paid attention, which only fall during the ORR via the *OOH intermediate. Rh core works well as long as the ORR does not undergo the pathway via *Omore »
- Authors:
-
- Jilin Univ., Changchun (China)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Jilin Univ., Changchun (China); Changchun Univ. (China)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1213375
- Alternate Identifier(s):
- OSTI ID: 1228251
- Report Number(s):
- BNL-108253-2015-JA
Journal ID: ISSN 0021-9606; JCPSA6; KC0403020; TRN: US1500642
- Grant/Contract Number:
- SC00112704; SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 142; Journal Issue: 19; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Pt monolayer; pseudomorphic surface alloy; acid/alkaline solution; stability; ORR; DFT
Citation Formats
Zhang, Xiaoming, Liu, Ping, Yu, Shansheng, Qiao, Liang, and Zheng, Weitao. Stabilization of Pt monolayer catalysts under harsh conditions of fuel cells. United States: N. p., 2015.
Web. doi:10.1063/1.4921257.
Zhang, Xiaoming, Liu, Ping, Yu, Shansheng, Qiao, Liang, & Zheng, Weitao. Stabilization of Pt monolayer catalysts under harsh conditions of fuel cells. United States. https://doi.org/10.1063/1.4921257
Zhang, Xiaoming, Liu, Ping, Yu, Shansheng, Qiao, Liang, and Zheng, Weitao. Thu .
"Stabilization of Pt monolayer catalysts under harsh conditions of fuel cells". United States. https://doi.org/10.1063/1.4921257. https://www.osti.gov/servlets/purl/1213375.
@article{osti_1213375,
title = {Stabilization of Pt monolayer catalysts under harsh conditions of fuel cells},
author = {Zhang, Xiaoming and Liu, Ping and Yu, Shansheng and Qiao, Liang and Zheng, Weitao},
abstractNote = {We employed density functional theory (DFT) to explore the stability of core (M = Cu, Ru, Rh, Pd, Ag, Os, Ir, Au)-shell (Pt) catalysts under harsh conditions, including solutions and reaction intermediates involved in the oxygen reduction reaction (ORR) in fuel cells. A pseudomorphic surface alloy (PSA) with a Pt monolayer (Pt1ML) supported on an M surface, Pt1ML/M(111) or (001), was considered as a model system. Different sets of candidate M cores were identified to achieve a stable Pt1ML shell depending on the conditions. In vacuum conditions, the Pt1ML shell can be stabilized on the most of M cores except Cu, Ag, and Au. The situation varies under various electrochemical conditions. Depending on the solutions and the operating reaction pathways of the ORR, different M should be considered. Pd and Ir are the only core metals studied, being able to keep the PtML shell intact in perchloric acid, sulfuric acid, phosphoric acid, and alkaline solutions as well as under the ORR conditions via different pathways. Ru and Os cores should also be paid attention, which only fall during the ORR via the *OOH intermediate. Rh core works well as long as the ORR does not undergo the pathway via *O intermediate. Our results show that PSAs can behave differently from the near surface alloy, Pt1ML/M1ML/Pt(111), highlighting the importance of considering both chemical environments and the atomic structures in rational design of highly stable core-shell nanocatalysts. Finally, the roles that d-band center of a core M played in determining the stability of supported Pt1ML shell were also discussed.},
doi = {10.1063/1.4921257},
journal = {Journal of Chemical Physics},
number = 19,
volume = 142,
place = {United States},
year = {Thu May 21 00:00:00 EDT 2015},
month = {Thu May 21 00:00:00 EDT 2015}
}
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