Use of pyrophosphate and boric acid additives in the copper-zinc alloy electrodeposition and chemical dealloying

Sébastien Vivegnis, Mohamed Krid, Joseph Delhalle, Zineb Mekhalif, Frank Renner

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Over the last decade, nanoporous metals have attracted a growing attention due to the combination of structural and functional properties, such as their very high surface to volume ratio and mechanical rigidity. A recent and versatile process producing nanoporous metals is the dealloying of an initial alloy, i.e. the selective dissolution of the more reactive element of the alloy. In this work, we report on a method of CuZn alloy formation, without the use of furnaces or expensive techniques, and its subsequent chemical dealloying leading to nanoporous copper. Co-electrodeposition of CuZn alloys on a copper substrate is performed using pyrophosphate as a complexing agent in presence of boric acid, copper sulfate and zinc sulfate. The electrochemical behavior of this system is characterized by cyclic voltammetry, showing that a copper-zinc alloy is formed at −1.5 V vs. SCE. Cauliflower-like Zn-rich γ-brass and ε-brass coatings are obtained by co-electrodeposition. The thickness, the structure and the composition of the electrodeposited alloy can be tuned by varying the electrodeposition conditions. Thicker and rougher coatings with a higher zinc content are formed at more cathodic conditions. The electrodeposited CuZn coatings were chemically dealloyed, and a two-step dealloying protocol leads to openframework nanoporous copper templates,which are a material of interest for energy storage, biosensors, and catalysis applications.
langue originaleAnglais
Pages (de - à)113310
Nombre de pages8
journalJournal of Electroanalytical Chemistry
Volume848
étatPublié - 16 juil. 2019

Empreinte digitale

Zinc alloys
Boric acid
Copper alloys
Electrodeposition
Copper
Brass
Coatings
Zinc
Metals
Copper Sulfate
Zinc Sulfate
Biosensors
Rigidity
Energy storage
Catalysis
Cyclic voltammetry
Dissolution
Furnaces
diphosphoric acid
boric acid

Citer ceci

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abstract = "Over the last decade, nanoporous metals have attracted a growing attention due to the combination of structural and functional properties, such as their very high surface to volume ratio and mechanical rigidity. A recent and versatile process producing nanoporous metals is the dealloying of an initial alloy, i.e. the selective dissolution of the more reactive element of the alloy. In this work, we report on a method of CuZn alloy formation, without the use of furnaces or expensive techniques, and its subsequent chemical dealloying leading to nanoporous copper. Co-electrodeposition of CuZn alloys on a copper substrate is performed using pyrophosphate as a complexing agent in presence of boric acid, copper sulfate and zinc sulfate. The electrochemical behavior of this system is characterized by cyclic voltammetry, showing that a copper-zinc alloy is formed at −1.5 V vs. SCE. Cauliflower-like Zn-rich γ-brass and ε-brass coatings are obtained by co-electrodeposition. The thickness, the structure and the composition of the electrodeposited alloy can be tuned by varying the electrodeposition conditions. Thicker and rougher coatings with a higher zinc content are formed at more cathodic conditions. The electrodeposited CuZn coatings were chemically dealloyed, and a two-step dealloying protocol leads to openframework nanoporous copper templates,which are a material of interest for energy storage, biosensors, and catalysis applications.",
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Use of pyrophosphate and boric acid additives in the copper-zinc alloy electrodeposition and chemical dealloying. / Vivegnis, Sébastien; Krid, Mohamed; Delhalle, Joseph; Mekhalif, Zineb; Renner, Frank.

Dans: Journal of Electroanalytical Chemistry, Vol 848, 16.07.2019, p. 113310.

Résultats de recherche: Contribution à un journal/une revueArticle

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T1 - Use of pyrophosphate and boric acid additives in the copper-zinc alloy electrodeposition and chemical dealloying

AU - Vivegnis, Sébastien

AU - Krid, Mohamed

AU - Delhalle, Joseph

AU - Mekhalif, Zineb

AU - Renner, Frank

PY - 2019/7/16

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AB - Over the last decade, nanoporous metals have attracted a growing attention due to the combination of structural and functional properties, such as their very high surface to volume ratio and mechanical rigidity. A recent and versatile process producing nanoporous metals is the dealloying of an initial alloy, i.e. the selective dissolution of the more reactive element of the alloy. In this work, we report on a method of CuZn alloy formation, without the use of furnaces or expensive techniques, and its subsequent chemical dealloying leading to nanoporous copper. Co-electrodeposition of CuZn alloys on a copper substrate is performed using pyrophosphate as a complexing agent in presence of boric acid, copper sulfate and zinc sulfate. The electrochemical behavior of this system is characterized by cyclic voltammetry, showing that a copper-zinc alloy is formed at −1.5 V vs. SCE. Cauliflower-like Zn-rich γ-brass and ε-brass coatings are obtained by co-electrodeposition. The thickness, the structure and the composition of the electrodeposited alloy can be tuned by varying the electrodeposition conditions. Thicker and rougher coatings with a higher zinc content are formed at more cathodic conditions. The electrodeposited CuZn coatings were chemically dealloyed, and a two-step dealloying protocol leads to openframework nanoporous copper templates,which are a material of interest for energy storage, biosensors, and catalysis applications.

KW - CuZn electrodeposition

KW - Two-step chemical dealloying

KW - Nanostructured copper

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