Platinum-Coated Nickel Nanowires as Oxygen-Reducing Electrocatalysts

Shaun M. Alia; Brian A. Larsen; Svitlana Pylypenko; David A. Cullen; David R. Diercks; K. C. Neyerlin; Shyam S. Kocha; Bryan S. Pivovar

doi:10.1021/cs401081w

Platinum-Coated Nickel Nanowires as Oxygen-Reducing Electrocatalysts

Shaun M. Alia, Brian A. Larsen, Svitlana Pylypenko, David A. Cullen, David R. Diercks, K. C. Neyerlin, Shyam S. Kocha, Bryan S. Pivovar

Chemistry and Nanoscience

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

86 Scopus Citations

Abstract

Platinum (Pt)-coated nickel (Ni) nanowires (PtNiNWs) are synthesized by the partial spontaneous galvanic displacement of NiNWs, with a diameter of 150-250 nm and a length of 100-200 μm. PtNiNWs are electrochemically characterized for oxygen reduction (ORR) in rotating disk electrode half-cells with an acidic electrolyte and compared to carbon-supported Pt (Pt/HSC) and a polycrystalline Pt electrode. Like other extended surface catalysts, the nanowire morphology yields significant gains in ORR specific activity compared to Pt/HSC. Unlike other extended surface approaches, the resultant materials have yielded exceptionally high surface areas, greater than 90 m² g _Pt^-1. These studies have found that reducing the level of Pt displacement increases Pt surface area and ORR mass activity. PtNiNWs produce a peak mass activity of 917 mA mg_Pt^-1, 3.0 times greater than Pt/HSC and 2.1 times greater than the U.S. Department of Energy target for proton-exchange membrane fuel cell activity.

Original language	American English
Pages (from-to)	1114-1119
Number of pages	6
Journal	ACS Catalysis
Volume	4
Issue number	4
DOIs	https://doi.org/10.1021/cs401081w https://doi.org/10.1021/cs401081w
State	Published - 4 Apr 2014

NREL Publication Number

NREL/JA-5900-60666

Keywords

electrocatalysis
electrochemistry
fuel cells
galvanic displacement
oxygen reduction reaction

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title = "Platinum-Coated Nickel Nanowires as Oxygen-Reducing Electrocatalysts",

abstract = "Platinum (Pt)-coated nickel (Ni) nanowires (PtNiNWs) are synthesized by the partial spontaneous galvanic displacement of NiNWs, with a diameter of 150-250 nm and a length of 100-200 μm. PtNiNWs are electrochemically characterized for oxygen reduction (ORR) in rotating disk electrode half-cells with an acidic electrolyte and compared to carbon-supported Pt (Pt/HSC) and a polycrystalline Pt electrode. Like other extended surface catalysts, the nanowire morphology yields significant gains in ORR specific activity compared to Pt/HSC. Unlike other extended surface approaches, the resultant materials have yielded exceptionally high surface areas, greater than 90 m2 g Pt-1. These studies have found that reducing the level of Pt displacement increases Pt surface area and ORR mass activity. PtNiNWs produce a peak mass activity of 917 mA mgPt-1, 3.0 times greater than Pt/HSC and 2.1 times greater than the U.S. Department of Energy target for proton-exchange membrane fuel cell activity.",

keywords = "electrocatalysis, electrochemistry, fuel cells, galvanic displacement, oxygen reduction reaction",

author = "Alia, {Shaun M.} and Larsen, {Brian A.} and Svitlana Pylypenko and Cullen, {David A.} and Diercks, {David R.} and Neyerlin, {K. C.} and Kocha, {Shyam S.} and Pivovar, {Bryan S.}",

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doi = "10.1021/cs401081w",

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T1 - Platinum-Coated Nickel Nanowires as Oxygen-Reducing Electrocatalysts

AU - Alia, Shaun M.

AU - Larsen, Brian A.

AU - Pylypenko, Svitlana

AU - Cullen, David A.

AU - Diercks, David R.

AU - Neyerlin, K. C.

AU - Kocha, Shyam S.

AU - Pivovar, Bryan S.

PY - 2014/4/4

Y1 - 2014/4/4

N2 - Platinum (Pt)-coated nickel (Ni) nanowires (PtNiNWs) are synthesized by the partial spontaneous galvanic displacement of NiNWs, with a diameter of 150-250 nm and a length of 100-200 μm. PtNiNWs are electrochemically characterized for oxygen reduction (ORR) in rotating disk electrode half-cells with an acidic electrolyte and compared to carbon-supported Pt (Pt/HSC) and a polycrystalline Pt electrode. Like other extended surface catalysts, the nanowire morphology yields significant gains in ORR specific activity compared to Pt/HSC. Unlike other extended surface approaches, the resultant materials have yielded exceptionally high surface areas, greater than 90 m2 g Pt-1. These studies have found that reducing the level of Pt displacement increases Pt surface area and ORR mass activity. PtNiNWs produce a peak mass activity of 917 mA mgPt-1, 3.0 times greater than Pt/HSC and 2.1 times greater than the U.S. Department of Energy target for proton-exchange membrane fuel cell activity.

AB - Platinum (Pt)-coated nickel (Ni) nanowires (PtNiNWs) are synthesized by the partial spontaneous galvanic displacement of NiNWs, with a diameter of 150-250 nm and a length of 100-200 μm. PtNiNWs are electrochemically characterized for oxygen reduction (ORR) in rotating disk electrode half-cells with an acidic electrolyte and compared to carbon-supported Pt (Pt/HSC) and a polycrystalline Pt electrode. Like other extended surface catalysts, the nanowire morphology yields significant gains in ORR specific activity compared to Pt/HSC. Unlike other extended surface approaches, the resultant materials have yielded exceptionally high surface areas, greater than 90 m2 g Pt-1. These studies have found that reducing the level of Pt displacement increases Pt surface area and ORR mass activity. PtNiNWs produce a peak mass activity of 917 mA mgPt-1, 3.0 times greater than Pt/HSC and 2.1 times greater than the U.S. Department of Energy target for proton-exchange membrane fuel cell activity.

KW - electrocatalysis

KW - electrochemistry

KW - fuel cells

KW - galvanic displacement

KW - oxygen reduction reaction

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ER -

Platinum-Coated Nickel Nanowires as Oxygen-Reducing Electrocatalysts

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Keywords

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