Suppression of Oxygen Reduction Reaction Activity on Pt-Based Electrocatalysts from Ionomer Incorporation

Kazuma Shinozaki; Yu Morimoto; Bryan S. Pivovar; Shyam S. Kocha

doi:10.1016/j.jpowsour.2016.06.062

Suppression of Oxygen Reduction Reaction Activity on Pt-Based Electrocatalysts from Ionomer Incorporation

Kazuma Shinozaki, Yu Morimoto, Bryan S. Pivovar, Shyam S. Kocha

Chemistry and Nanoscience

Research output: Contribution to journal › Article › peer-review

131 Scopus Citations

Abstract

The impact of Nafion on the oxygen reduction reaction (ORR) activity is studied for Pt/C and Pt-alloy/C catalysts using thin-film rotating disk electrode (TF-RDE) methods in 0.1 M HClO₄. Ultrathin uniform catalyst layers and standardized activity measurement protocols are employed to obtain accurate and reproducible ORR activity. Nafion lowers the ORR activity which plateaus with increasing loading on Pt catalysts. Pt particle size is found not to have significant influence on the extent of the SA decrease upon Nafion incorporation. Catalysts using high surface area carbon (HSC) support exhibit attenuated activity loss resulting from lower ionomer coverage on catalyst particles located within the deep pores. The impact of metallic composition on the activity loss due to Nafion incorporation is also discussed.

Original language	American English
Pages (from-to)	745-751
Number of pages	7
Journal	Journal of Power Sources
Volume	325
DOIs	https://doi.org/10.1016/j.jpowsour.2016.06.062 https://doi.org/10.1016/j.jpowsour.2016.06.062
State	Published - 1 Sep 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

NREL Publication Number

NREL/JA-5900-66820

Keywords

Ionomer coverage
Nafion ionomer
Oxygen reduction reaction
Platinum
Platinum alloy
Rotating disk electrode method

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Suppression of Oxygen Reduction Reaction Activity on Pt-Based Electrocatalysts from Ionomer Incorporation",

abstract = "The impact of Nafion on the oxygen reduction reaction (ORR) activity is studied for Pt/C and Pt-alloy/C catalysts using thin-film rotating disk electrode (TF-RDE) methods in 0.1 M HClO4. Ultrathin uniform catalyst layers and standardized activity measurement protocols are employed to obtain accurate and reproducible ORR activity. Nafion lowers the ORR activity which plateaus with increasing loading on Pt catalysts. Pt particle size is found not to have significant influence on the extent of the SA decrease upon Nafion incorporation. Catalysts using high surface area carbon (HSC) support exhibit attenuated activity loss resulting from lower ionomer coverage on catalyst particles located within the deep pores. The impact of metallic composition on the activity loss due to Nafion incorporation is also discussed.",

keywords = "Ionomer coverage, Nafion ionomer, Oxygen reduction reaction, Platinum, Platinum alloy, Rotating disk electrode method",

author = "Kazuma Shinozaki and Yu Morimoto and Pivovar, {Bryan S.} and Kocha, {Shyam S.}",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

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T1 - Suppression of Oxygen Reduction Reaction Activity on Pt-Based Electrocatalysts from Ionomer Incorporation

AU - Shinozaki, Kazuma

AU - Morimoto, Yu

AU - Pivovar, Bryan S.

AU - Kocha, Shyam S.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - The impact of Nafion on the oxygen reduction reaction (ORR) activity is studied for Pt/C and Pt-alloy/C catalysts using thin-film rotating disk electrode (TF-RDE) methods in 0.1 M HClO4. Ultrathin uniform catalyst layers and standardized activity measurement protocols are employed to obtain accurate and reproducible ORR activity. Nafion lowers the ORR activity which plateaus with increasing loading on Pt catalysts. Pt particle size is found not to have significant influence on the extent of the SA decrease upon Nafion incorporation. Catalysts using high surface area carbon (HSC) support exhibit attenuated activity loss resulting from lower ionomer coverage on catalyst particles located within the deep pores. The impact of metallic composition on the activity loss due to Nafion incorporation is also discussed.

AB - The impact of Nafion on the oxygen reduction reaction (ORR) activity is studied for Pt/C and Pt-alloy/C catalysts using thin-film rotating disk electrode (TF-RDE) methods in 0.1 M HClO4. Ultrathin uniform catalyst layers and standardized activity measurement protocols are employed to obtain accurate and reproducible ORR activity. Nafion lowers the ORR activity which plateaus with increasing loading on Pt catalysts. Pt particle size is found not to have significant influence on the extent of the SA decrease upon Nafion incorporation. Catalysts using high surface area carbon (HSC) support exhibit attenuated activity loss resulting from lower ionomer coverage on catalyst particles located within the deep pores. The impact of metallic composition on the activity loss due to Nafion incorporation is also discussed.

KW - Ionomer coverage

KW - Nafion ionomer

KW - Oxygen reduction reaction

KW - Platinum

KW - Platinum alloy

KW - Rotating disk electrode method

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DO - 10.1016/j.jpowsour.2016.06.062

M3 - Article

AN - SCOPUS:84976388663

SN - 0378-7753

VL - 325

SP - 745

EP - 751

JO - Journal of Power Sources

JF - Journal of Power Sources

ER -

Suppression of Oxygen Reduction Reaction Activity on Pt-Based Electrocatalysts from Ionomer Incorporation

Abstract

Bibliographical note

NREL Publication Number

Keywords

UN SDGs

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