Platinum-coated cobalt nanowires as oxygen reduction reaction electrocatalysts

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

doi:10.1021/cs500370q

Platinum-coated cobalt nanowires as oxygen reduction reaction electrocatalysts

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

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Abstract

Cobalt nanowires (CoNWs) are coated with platinum (Pt) by partial galvanic displacement, forming core/shell wires 200-300 nm in diameter and 100-200 μm in length. Pt-coated CoNWs (PtCoNWs) are characterized for activity in the oxygen reduction reaction (ORR) with rotating disk electrode half-cells in 0.1 M perchloric acid electrolytes. The resulting catalysts demonstrate ORR-specific activities in the range 2053-2783 μA cm_Pt^-2, comparable to the specific activity of polycrystalline Pt. The specific activities of PtCoNWs increase with decreasing Pt content and exhibit a corresponding increase in Pt lattice compression. PtCoNWs have exhibited a maximum mass activity of 793 mA mg_Pt^-1, 2.6 times greater than carbon-supported Pt nanoparticles.

Original language	English
Pages (from-to)	2680-2686
Number of pages	7
Journal	ACS Catalysis
Volume	4
Issue number	8
DOIs	https://doi.org/10.1021/cs500370q
State	Published - Aug 2014

Keywords

electrochemistry
extended surfaces
fuel cells
galvanic displacement
oxygen reduction reaction

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

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10.1021/cs500370q

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title = "Platinum-coated cobalt nanowires as oxygen reduction reaction electrocatalysts",

abstract = "Cobalt nanowires (CoNWs) are coated with platinum (Pt) by partial galvanic displacement, forming core/shell wires 200-300 nm in diameter and 100-200 μm in length. Pt-coated CoNWs (PtCoNWs) are characterized for activity in the oxygen reduction reaction (ORR) with rotating disk electrode half-cells in 0.1 M perchloric acid electrolytes. The resulting catalysts demonstrate ORR-specific activities in the range 2053-2783 μA cmPt-2, comparable to the specific activity of polycrystalline Pt. The specific activities of PtCoNWs increase with decreasing Pt content and exhibit a corresponding increase in Pt lattice compression. PtCoNWs have exhibited a maximum mass activity of 793 mA mgPt-1, 2.6 times greater than carbon-supported Pt nanoparticles.",

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

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

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T1 - Platinum-coated cobalt nanowires as oxygen reduction reaction electrocatalysts

AU - Alia, Shaun M.

AU - Pylypenko, Svitlana

AU - Neyerlin, K. C.

AU - Cullen, David A.

AU - Kocha, Shyam S.

AU - Pivovar, Bryan S.

PY - 2014/8

Y1 - 2014/8

N2 - Cobalt nanowires (CoNWs) are coated with platinum (Pt) by partial galvanic displacement, forming core/shell wires 200-300 nm in diameter and 100-200 μm in length. Pt-coated CoNWs (PtCoNWs) are characterized for activity in the oxygen reduction reaction (ORR) with rotating disk electrode half-cells in 0.1 M perchloric acid electrolytes. The resulting catalysts demonstrate ORR-specific activities in the range 2053-2783 μA cmPt-2, comparable to the specific activity of polycrystalline Pt. The specific activities of PtCoNWs increase with decreasing Pt content and exhibit a corresponding increase in Pt lattice compression. PtCoNWs have exhibited a maximum mass activity of 793 mA mgPt-1, 2.6 times greater than carbon-supported Pt nanoparticles.

AB - Cobalt nanowires (CoNWs) are coated with platinum (Pt) by partial galvanic displacement, forming core/shell wires 200-300 nm in diameter and 100-200 μm in length. Pt-coated CoNWs (PtCoNWs) are characterized for activity in the oxygen reduction reaction (ORR) with rotating disk electrode half-cells in 0.1 M perchloric acid electrolytes. The resulting catalysts demonstrate ORR-specific activities in the range 2053-2783 μA cmPt-2, comparable to the specific activity of polycrystalline Pt. The specific activities of PtCoNWs increase with decreasing Pt content and exhibit a corresponding increase in Pt lattice compression. PtCoNWs have exhibited a maximum mass activity of 793 mA mgPt-1, 2.6 times greater than carbon-supported Pt nanoparticles.

KW - electrochemistry

KW - extended surfaces

KW - fuel cells

KW - galvanic displacement

KW - oxygen reduction reaction

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JF - ACS Catalysis

IS - 8

ER -

Platinum-coated cobalt nanowires as oxygen reduction reaction electrocatalysts

Abstract

Keywords

UN SDGs

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