Selective site occupancy exhibited by Cr{sup 3+} and Cr{sup 6+} incorporated into electrochemically deposited nickel hydroxide films.

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Electrochem. Solid State Lett.

DOI:https://doi.org/10.1149/1.1390771· OSTI ID:938396

Balasubramanian, M; Melendres, C A

We have utilized extended X-ray absorption fine structure (EXAFS) spectroscopy to investigate the site occupancy and local structure of Cr{sup 3+} and Cr{sup 6+} ions incorporated into electrodeposited alpha-Ni(OH){sub 2} films. The films were prepared by codeposition of Cr and Ni at constant cathodic current from aqueous solutions of nickel nitrate, and potassium chromate. EXAFS measurements show that in films produced from Ni{sup 2+} and Cr{sup 3+} solution, Cr{sup 3+} is incorporated into Ni lattice sites in alpha-Ni(OH)2. On the other hand, cathodic co deposition of Cr{sup 6+} and Ni{sup 2+} results in CrO{sub 4}{sup 2-} in interlamellar sites as well as sorbed on the surface of alpha-Ni(OH)2. These results are of significance in a number of technological areas, e.g., batteries, corrosion protection, environmental speciation, and remediation.

• Research Organization: Argonne National Laboratory (ANL)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 938396
• Report Number(s): ANL/CMT/JA-30142
• Journal Information: Electrochem. Solid State Lett., Journal Name: Electrochem. Solid State Lett. Journal Issue: 4 ; 1999 Vol. 2; ISSN 1099-0062
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
AQUEOUS SOLUTIONS
CHROMIUM IONS
CORROSION PROTECTION
DEPOSITION
FILMS
FINE STRUCTURE
NICKEL HYDROXIDES
NICKEL NITRATES
POTASSIUM
SPECTROSCOPY