Pt-Ir and Pt-Cu binary alloys as the electrocatalyst for ammonia oxidation

Kazuki Endo; Yasushi Katayama; Takashi Miura

doi:10.1016/S0013-4686(03)00993-9

Pt-Ir and Pt-Cu binary alloys as the electrocatalyst for ammonia oxidation

Kazuki Endo, Yasushi Katayama, Takashi Miura

Department of Applied Chemistry

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

82 Citations (Scopus)

Abstract

The electrocatalytic activities of Pt_0.8Ir_0.2, Pt_0.5Cu_0.5, Pt_0.67Cu_0.33, Pt, and Ir for ammonia oxidation have been studied comparatively in KOH solutions by cyclic voltammetry and potentiostatic polarization. The anodic oxidation began on Ir at a lower potential than on Pt by about 0.1V, whereas the oxidation peak current density on Ir was much lower than that on Pt. On the binary alloy of Pt_0.8Ir_0.2, the oxidation started at slightly lower potential than on Pt, and the peak current density was slightly higher than that on Pt. In contrast, Pt_0.5Cu_0.5 and Pt _0.67Cu_0.33 alloys showed almost the compatible activity inferior to Pt. These facts suggested that alloying in the Pt-Ir binary system may lead to the enhancement of ammonia oxidation activity due to a kind of cooperative interaction between Pt and Ir.

Original language	English
Pages (from-to)	1635-1638
Number of pages	4
Journal	Electrochimica Acta
Volume	49
Issue number	9-10
DOIs	https://doi.org/10.1016/S0013-4686(03)00993-9
Publication status	Published - 2004 Apr 15

Keywords

Ammonia oxidation
Binary alloy
Electrocatalyst
Pt-Cu
Pt-Ir

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

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10.1016/S0013-4686(03)00993-9

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title = "Pt-Ir and Pt-Cu binary alloys as the electrocatalyst for ammonia oxidation",

abstract = "The electrocatalytic activities of Pt0.8Ir0.2, Pt0.5Cu0.5, Pt0.67Cu0.33, Pt, and Ir for ammonia oxidation have been studied comparatively in KOH solutions by cyclic voltammetry and potentiostatic polarization. The anodic oxidation began on Ir at a lower potential than on Pt by about 0.1V, whereas the oxidation peak current density on Ir was much lower than that on Pt. On the binary alloy of Pt0.8Ir0.2, the oxidation started at slightly lower potential than on Pt, and the peak current density was slightly higher than that on Pt. In contrast, Pt0.5Cu0.5 and Pt 0.67Cu0.33 alloys showed almost the compatible activity inferior to Pt. These facts suggested that alloying in the Pt-Ir binary system may lead to the enhancement of ammonia oxidation activity due to a kind of cooperative interaction between Pt and Ir.",

keywords = "Ammonia oxidation, Binary alloy, Electrocatalyst, Pt-Cu, Pt-Ir",

author = "Kazuki Endo and Yasushi Katayama and Takashi Miura",

note = "Funding Information: A part of this work was supported by Grant-in-Aid for the 21st Century COE program “KEIO Life Conjugate Chemistry” from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.",

year = "2004",

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doi = "10.1016/S0013-4686(03)00993-9",

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T1 - Pt-Ir and Pt-Cu binary alloys as the electrocatalyst for ammonia oxidation

AU - Endo, Kazuki

AU - Katayama, Yasushi

AU - Miura, Takashi

N1 - Funding Information: A part of this work was supported by Grant-in-Aid for the 21st Century COE program “KEIO Life Conjugate Chemistry” from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.

PY - 2004/4/15

Y1 - 2004/4/15

N2 - The electrocatalytic activities of Pt0.8Ir0.2, Pt0.5Cu0.5, Pt0.67Cu0.33, Pt, and Ir for ammonia oxidation have been studied comparatively in KOH solutions by cyclic voltammetry and potentiostatic polarization. The anodic oxidation began on Ir at a lower potential than on Pt by about 0.1V, whereas the oxidation peak current density on Ir was much lower than that on Pt. On the binary alloy of Pt0.8Ir0.2, the oxidation started at slightly lower potential than on Pt, and the peak current density was slightly higher than that on Pt. In contrast, Pt0.5Cu0.5 and Pt 0.67Cu0.33 alloys showed almost the compatible activity inferior to Pt. These facts suggested that alloying in the Pt-Ir binary system may lead to the enhancement of ammonia oxidation activity due to a kind of cooperative interaction between Pt and Ir.

AB - The electrocatalytic activities of Pt0.8Ir0.2, Pt0.5Cu0.5, Pt0.67Cu0.33, Pt, and Ir for ammonia oxidation have been studied comparatively in KOH solutions by cyclic voltammetry and potentiostatic polarization. The anodic oxidation began on Ir at a lower potential than on Pt by about 0.1V, whereas the oxidation peak current density on Ir was much lower than that on Pt. On the binary alloy of Pt0.8Ir0.2, the oxidation started at slightly lower potential than on Pt, and the peak current density was slightly higher than that on Pt. In contrast, Pt0.5Cu0.5 and Pt 0.67Cu0.33 alloys showed almost the compatible activity inferior to Pt. These facts suggested that alloying in the Pt-Ir binary system may lead to the enhancement of ammonia oxidation activity due to a kind of cooperative interaction between Pt and Ir.

KW - Ammonia oxidation

KW - Binary alloy

KW - Electrocatalyst

KW - Pt-Cu

KW - Pt-Ir

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SN - 0013-4686

VL - 49

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JO - Electrochimica Acta

JF - Electrochimica Acta

IS - 9-10

ER -

Pt-Ir and Pt-Cu binary alloys as the electrocatalyst for ammonia oxidation

Abstract

Keywords

ASJC Scopus subject areas

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