Sub-4 nm PtZn Intermetallic Nanoparticles for Enhanced Mass and Specific Activities in Catalytic Electrooxidation Reaction
Atomically ordered intermetallic nanoparticles (iNPs) have sparked considerable interest in fuel cell applications by virtue of their exceptional electronic and structural properties. However, the synthesis of small iNPs in a controllable manner remains a formidable challenge because of the high temperature generally required in the formation of intermetallic phases. Here in this paper we report a general method for the synthesis of PtZn iNPs (3.2 ± 0.4 nm) on multiwalled carbon nanotubes (MWNT) via a facile and capping agent free strategy using a sacrificial mesoporous silica (mSiO 2) shell. The as-prepared PtZn iNPs exhibited ca. 10 times higher mass activity in both acidic and basic solution toward the methanol oxidation reaction (MOR) compared to larger PtZn iNPs synthesized on MWNT without the mSiO 2 shell. Density functional theory (DFT) calculations predict that PtZn systems go through a “non-CO” pathway for MOR because of the stabilization of the OH* intermediate by Zn atoms, while a pure Pt system forms highly stable COH* and CO* intermediates, leading to catalyst deactivation. Experimental studies on the origin of the backward oxidation peak of MOR coincide well with DFT predictions. Moreover, the calculations demonstrate that MOR on smaller PtZn iNPs is energetically more favorable thanmore »
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- Iowa State Univ., Ames, IA (United States). Dept. of Chemistry
- Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
- Ames Lab., Ames, IA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Iowa State Univ., Ames, IA (United States). Dept. of Chemistry; Ames Lab., Ames, IA (United States)
- Publication Date:
- Report Number(s):
- IS-J-9261
Journal ID: ISSN 0002-7863; TRN: US1702295
- Grant/Contract Number:
- CHE-1607305; AC02-07CH11358; AC02-06CH11357
- Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 139; Journal Issue: 13; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Research Org:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
- OSTI Identifier:
- 1355406
Qi, Zhiyuan, Xiao, Chaoxian, Liu, Cong, Goh, Tian Wei, Zhou, Lin, Maligal-Ganesh, Raghu, Pei, Yuchen, Li, Xinle, Curtiss, Larry A., and Huang, Wenyu. Sub-4 nm PtZn Intermetallic Nanoparticles for Enhanced Mass and Specific Activities in Catalytic Electrooxidation Reaction. United States: N. p.,
Web. doi:10.1021/jacs.6b12780.
Qi, Zhiyuan, Xiao, Chaoxian, Liu, Cong, Goh, Tian Wei, Zhou, Lin, Maligal-Ganesh, Raghu, Pei, Yuchen, Li, Xinle, Curtiss, Larry A., & Huang, Wenyu. Sub-4 nm PtZn Intermetallic Nanoparticles for Enhanced Mass and Specific Activities in Catalytic Electrooxidation Reaction. United States. doi:10.1021/jacs.6b12780.
Qi, Zhiyuan, Xiao, Chaoxian, Liu, Cong, Goh, Tian Wei, Zhou, Lin, Maligal-Ganesh, Raghu, Pei, Yuchen, Li, Xinle, Curtiss, Larry A., and Huang, Wenyu. 2017.
"Sub-4 nm PtZn Intermetallic Nanoparticles for Enhanced Mass and Specific Activities in Catalytic Electrooxidation Reaction". United States.
doi:10.1021/jacs.6b12780. https://www.osti.gov/servlets/purl/1355406.
@article{osti_1355406,
title = {Sub-4 nm PtZn Intermetallic Nanoparticles for Enhanced Mass and Specific Activities in Catalytic Electrooxidation Reaction},
author = {Qi, Zhiyuan and Xiao, Chaoxian and Liu, Cong and Goh, Tian Wei and Zhou, Lin and Maligal-Ganesh, Raghu and Pei, Yuchen and Li, Xinle and Curtiss, Larry A. and Huang, Wenyu},
abstractNote = {Atomically ordered intermetallic nanoparticles (iNPs) have sparked considerable interest in fuel cell applications by virtue of their exceptional electronic and structural properties. However, the synthesis of small iNPs in a controllable manner remains a formidable challenge because of the high temperature generally required in the formation of intermetallic phases. Here in this paper we report a general method for the synthesis of PtZn iNPs (3.2 ± 0.4 nm) on multiwalled carbon nanotubes (MWNT) via a facile and capping agent free strategy using a sacrificial mesoporous silica (mSiO2) shell. The as-prepared PtZn iNPs exhibited ca. 10 times higher mass activity in both acidic and basic solution toward the methanol oxidation reaction (MOR) compared to larger PtZn iNPs synthesized on MWNT without the mSiO2 shell. Density functional theory (DFT) calculations predict that PtZn systems go through a “non-CO” pathway for MOR because of the stabilization of the OH* intermediate by Zn atoms, while a pure Pt system forms highly stable COH* and CO* intermediates, leading to catalyst deactivation. Experimental studies on the origin of the backward oxidation peak of MOR coincide well with DFT predictions. Moreover, the calculations demonstrate that MOR on smaller PtZn iNPs is energetically more favorable than larger iNPs, due to their high density of corner sites and lower-lying energetic pathway. Therefore, smaller PtZn iNPs not only increase the number but also enhance the activity of the active sites in MOR compared with larger ones. This work opens a new avenue for the synthesis of small iNPs with more undercoordinated and enhanced active sites for fuel cell applications.},
doi = {10.1021/jacs.6b12780},
journal = {Journal of the American Chemical Society},
number = 13,
volume = 139,
place = {United States},
year = {2017},
month = {3}
}
- Free Publicly Accessible Full Text
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Accepted Manuscript (DOE)
- Publisher's Version of Record
- https://doi.org/10.1021/jacs.6b12780