Selective Site Occupancy Exhibited by Cr3+ and Cr6+ Incorporated into Electrochemically Deposited Nickel Hydroxide Films

M. Balasubramanian; C. A. Melendres

doi:10.1149/1.1390771

Selective Site Occupancy Exhibited by Cr³⁺ and Cr⁶⁺ Incorporated into Electrochemically Deposited Nickel Hydroxide Films

M. Balasubramanian, C. A. Melendres

Emerging and Solid-State Batteries

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Abstract

We have utilized extended X-ray absorption fine structure (EXAFS) spectroscopy to investigate the site occupancy and local structure of Cr³⁺ and Cr⁶⁺ ions incorporated into electrodeposited α-Ni(OH)₂ films. The films were prepared by codeposition of Cr and Ni at constant cathodic current from aqueous solutions of nickel nitrate, chromium nitrate, and potassium chromate. EXAFS measurements show that in films produced from Ni²⁺ and Cr³⁺ solution, Cr³⁺ is incorporated into Ni lattice sites in α-Ni(OH)₂. On the other hand, cathodic co deposition of Cr⁶⁺ and Ni²⁺ results in CrO₄^2- in interlamellar sites as well as sorbed on the surface of α-Ni(OH)₂. These results are of significance in a number of technological areas, e.g., batteries, corrosion protection, environmental speciation, and remediation. @ 1999 The Electrochemical Society. S1099-0062(98)06-015-5. All rights reserved.

Original language	English
Pages (from-to)	167-169
Number of pages	3
Journal	Electrochemical and Solid-State Letters
Volume	2
Issue number	2-4
DOIs	https://doi.org/10.1149/1.1390771
State	Published - Apr 1999

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title = "Selective Site Occupancy Exhibited by Cr3+ and Cr6+ Incorporated into Electrochemically Deposited Nickel Hydroxide Films",

abstract = "We have utilized extended X-ray absorption fine structure (EXAFS) spectroscopy to investigate the site occupancy and local structure of Cr3+ and Cr6+ ions incorporated into electrodeposited α-Ni(OH)2 films. The films were prepared by codeposition of Cr and Ni at constant cathodic current from aqueous solutions of nickel nitrate, chromium nitrate, and potassium chromate. EXAFS measurements show that in films produced from Ni2+ and Cr3+ solution, Cr3+ is incorporated into Ni lattice sites in α-Ni(OH)2. On the other hand, cathodic co deposition of Cr6+ and Ni2+ results in CrO42- in interlamellar sites as well as sorbed on the surface of α-Ni(OH)2. These results are of significance in a number of technological areas, e.g., batteries, corrosion protection, environmental speciation, and remediation. @ 1999 The Electrochemical Society. S1099-0062(98)06-015-5. All rights reserved.",

author = "M. Balasubramanian and Melendres, {C. A.}",

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T1 - Selective Site Occupancy Exhibited by Cr3+ and Cr6+ Incorporated into Electrochemically Deposited Nickel Hydroxide Films

AU - Balasubramanian, M.

AU - Melendres, C. A.

PY - 1999/4

Y1 - 1999/4

N2 - We have utilized extended X-ray absorption fine structure (EXAFS) spectroscopy to investigate the site occupancy and local structure of Cr3+ and Cr6+ ions incorporated into electrodeposited α-Ni(OH)2 films. The films were prepared by codeposition of Cr and Ni at constant cathodic current from aqueous solutions of nickel nitrate, chromium nitrate, and potassium chromate. EXAFS measurements show that in films produced from Ni2+ and Cr3+ solution, Cr3+ is incorporated into Ni lattice sites in α-Ni(OH)2. On the other hand, cathodic co deposition of Cr6+ and Ni2+ results in CrO42- in interlamellar sites as well as sorbed on the surface of α-Ni(OH)2. These results are of significance in a number of technological areas, e.g., batteries, corrosion protection, environmental speciation, and remediation. @ 1999 The Electrochemical Society. S1099-0062(98)06-015-5. All rights reserved.

AB - We have utilized extended X-ray absorption fine structure (EXAFS) spectroscopy to investigate the site occupancy and local structure of Cr3+ and Cr6+ ions incorporated into electrodeposited α-Ni(OH)2 films. The films were prepared by codeposition of Cr and Ni at constant cathodic current from aqueous solutions of nickel nitrate, chromium nitrate, and potassium chromate. EXAFS measurements show that in films produced from Ni2+ and Cr3+ solution, Cr3+ is incorporated into Ni lattice sites in α-Ni(OH)2. On the other hand, cathodic co deposition of Cr6+ and Ni2+ results in CrO42- in interlamellar sites as well as sorbed on the surface of α-Ni(OH)2. These results are of significance in a number of technological areas, e.g., batteries, corrosion protection, environmental speciation, and remediation. @ 1999 The Electrochemical Society. S1099-0062(98)06-015-5. All rights reserved.

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Selective Site Occupancy Exhibited by Cr³⁺ and Cr⁶⁺ Incorporated into Electrochemically Deposited Nickel Hydroxide Films

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