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Title: Oxidation of platinum nickel nanowires to improve durability of oxygen-reducing electrocatalysts

Abstract

In this study, the impact of heat treating platinum-coated nickel (Pt-Ni) nanowires in oxygen is examined to determine the effect on oxygen reduction (ORR) activity and durability. Pt-Ni nanowires exhibit promising ORR mass activities (3 times greater than Pt nanoparticles, 1.5 times greater than U.S. Department of Energy target) both before and after potential cycling for all but the highest annealing temperatures explored. The annealing of Pt-Ni nanowires in oxygen with increasing temperature is found to reduce surface area and ORR activity in comparison to the untreated material, but also reduces activity losses following durability testing. Following potential cycling, unannealed Pt-Ni nanowires show significant losses in surface area (23%) and specific activity (18%) while Pt-Ni nanowires annealed at 200°C show modest increases in surface area (2%) and specific activity (6%) after potential cycling. Increasing annealing temperatures also show a clear trend of decreasing Ni dissolution rates. While oxygen annealing has shown the ability to improve durability of Pt-Ni nanowires, significant Ni dissolution was observed in all samples and suggests oxide passivation while showing promise for improved durability, when employed by itself is insufficient to prevent all contamination concerns involving Ni dissolution.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Colorado School of Mines, Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office
OSTI Identifier:
1237036
Report Number(s):
NREL/JA-5900-63442
Journal ID: ISSN 0013-4651
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 163; Journal Issue: 3; Related Information: Journal of the Electrochemical Society; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; galvanic displacement; oxygen reduction; electrocatalysis; platinum; fuel cells; nanomaterials

Citation Formats

Alia, Shaun M., Pylypenko, Svitlana, Dameron, Arrelaine, Neyerlin, Kenneth C., Kocha, Shyam S., and Pivovar, Bryan S. Oxidation of platinum nickel nanowires to improve durability of oxygen-reducing electrocatalysts. United States: N. p., 2016. Web. doi:10.1149/2.0081605jes.
Alia, Shaun M., Pylypenko, Svitlana, Dameron, Arrelaine, Neyerlin, Kenneth C., Kocha, Shyam S., & Pivovar, Bryan S. Oxidation of platinum nickel nanowires to improve durability of oxygen-reducing electrocatalysts. United States. https://doi.org/10.1149/2.0081605jes
Alia, Shaun M., Pylypenko, Svitlana, Dameron, Arrelaine, Neyerlin, Kenneth C., Kocha, Shyam S., and Pivovar, Bryan S. Tue . "Oxidation of platinum nickel nanowires to improve durability of oxygen-reducing electrocatalysts". United States. https://doi.org/10.1149/2.0081605jes. https://www.osti.gov/servlets/purl/1237036.
@article{osti_1237036,
title = {Oxidation of platinum nickel nanowires to improve durability of oxygen-reducing electrocatalysts},
author = {Alia, Shaun M. and Pylypenko, Svitlana and Dameron, Arrelaine and Neyerlin, Kenneth C. and Kocha, Shyam S. and Pivovar, Bryan S.},
abstractNote = {In this study, the impact of heat treating platinum-coated nickel (Pt-Ni) nanowires in oxygen is examined to determine the effect on oxygen reduction (ORR) activity and durability. Pt-Ni nanowires exhibit promising ORR mass activities (3 times greater than Pt nanoparticles, 1.5 times greater than U.S. Department of Energy target) both before and after potential cycling for all but the highest annealing temperatures explored. The annealing of Pt-Ni nanowires in oxygen with increasing temperature is found to reduce surface area and ORR activity in comparison to the untreated material, but also reduces activity losses following durability testing. Following potential cycling, unannealed Pt-Ni nanowires show significant losses in surface area (23%) and specific activity (18%) while Pt-Ni nanowires annealed at 200°C show modest increases in surface area (2%) and specific activity (6%) after potential cycling. Increasing annealing temperatures also show a clear trend of decreasing Ni dissolution rates. While oxygen annealing has shown the ability to improve durability of Pt-Ni nanowires, significant Ni dissolution was observed in all samples and suggests oxide passivation while showing promise for improved durability, when employed by itself is insufficient to prevent all contamination concerns involving Ni dissolution.},
doi = {10.1149/2.0081605jes},
journal = {Journal of the Electrochemical Society},
number = 3,
volume = 163,
place = {United States},
year = {Tue Jan 12 00:00:00 EST 2016},
month = {Tue Jan 12 00:00:00 EST 2016}
}

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Works referencing / citing this record:

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