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Ga-doped Pt-Ni Octahedral Nanoparticles as a Highly Active and Durable Electrocatalyst for Oxygen Reduction Reaction

Lim, JeongHoon and Shin, Hyeyoung and Kim, MinJoong and Lee, Hoin and Lee, Kug-Seung and Kwon, YongKeun and Song, DongHoon and Oh, SeKwon and Kim, Hyungjun and Cho, EunAe (2018) Ga-doped Pt-Ni Octahedral Nanoparticles as a Highly Active and Durable Electrocatalyst for Oxygen Reduction Reaction. Nano Letters, 18 (4). pp. 2450-2458. ISSN 1530-6984. http://resolver.caltech.edu/CaltechAUTHORS:20180327-090854954

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Abstract

Bimetallic PtNi nanoparticles have been considered as a promising electrocatalyst for oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs) owing to their high catalytic activity. However, under typical fuel cell operating conditions, Ni atoms easily dissolve into the electrolyte, resulting in degradation of the catalyst and the membrane-electrode assembly (MEA). Here, we report gallium-doped PtNi octahedral nanoparticles on a carbon support (Ga-PtNi/C). The Ga-PtNi/C shows high ORR activity, marking an 11.7-fold improvement in the mass activity (1.24 A mgPt-1) and a 17.3-fold improvement in the specific activity (2.53 mA cm-2) compare to the commercial Pt/C (0.106 A mgPt-1 and 0.146 mA cm-2). Density functional theory calculations demonstrate that addition of Ga to octahedral PtNi can cause an increase in the oxygen intermediate binding energy, leading to the enhanced catalytic activity toward ORR. In a voltage-cycling test, the Ga-PtNi/C exhibits superior stability to PtNi/C and the commercial Pt/C, maintaining the initial Ni concentration and octahedral shape of the nanoparticles. Single cell using the Ga-PtNi/C exhibits higher initial performance and durability than those using the PtNi/C and the commercial Pt/C. The majority of the Ga-PtNi nanoparticles well maintain the octahedral shape without agglomeration after the single cell durability test (30,000 cycles). This work demonstrates that the octahedral Ga-PtNi/C can be utilized as a highly active and durable ORR catalyst in practical fuel cell applications.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acs.nanolett.8b00028DOIArticle
https://pubs.acs.org/doi/10.1021/acs.nanolett.8b00028PublisherArticle
https://pubs.acs.org/doi/suppl/10.1021/acs.nanolett.8b00028PublisherSupporting Information
ORCID:
AuthorORCID
Kim, Hyungjun0000-0001-8261-9381
Cho, EunAe0000-0002-2871-6903
Additional Information:© 2018 American Chemical Society. Received: January 3, 2018; Revised: March 5, 2018; Published: March 26, 2018. This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) under contract No. 20143030031340 and Korea Institute of Science and Technology (KIST) under contract No. 2017081254 and the Agency for Defense Development in South Korea (ADD). The authors declare no competing financial interest.
Funders:
Funding AgencyGrant Number
Korea Institute of Energy Technology Evaluation and Planning (KETEP)20143030031340
Korea Institute of Science and Technology (KIST)2017081254
Agency for Defense Development (South Korea)UNSPECIFIED
Subject Keywords:Oxygen reduction reaction (ORR), gallium (Ga), PtNi octahedral, membrane-electrode assembly (MEA), polymer electrolyte membrane fuel cell (PEMFC)
Record Number:CaltechAUTHORS:20180327-090854954
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180327-090854954
Official Citation:Ga–Doped Pt–Ni Octahedral Nanoparticles as a Highly Active and Durable Electrocatalyst for Oxygen Reduction Reaction. JeongHoon Lim, Hyeyoung Shin, MinJoong Kim, Hoin Lee, Kug-Seung Lee, YongKeun Kwon, DongHoon Song, SeKwon Oh, Hyungjun Kim, and EunAe Cho. Nano Letters 2018 18 (4), 2450-2458. DOI: 10.1021/acs.nanolett.8b00028
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85449
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Mar 2018 18:47
Last Modified:25 Apr 2018 18:27

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