A high yield synthesis of ligand-free iridium oxide nanoparticles with high electrocatalytic activity

Yixin Zhao; Emil A. Hernandez-Pagan; Nella M. Vargas-Barbosa; Jennifer L. Dysart; Thomas E. Mallouk

doi:10.1021/jz200051c

A high yield synthesis of ligand-free iridium oxide nanoparticles with high electrocatalytic activity

Yixin Zhao, Emil A. Hernandez-Pagan, Nella M. Vargas-Barbosa, Jennifer L. Dysart, Thomas E. Mallouk

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270 Scopus citations

Abstract

Stable blue suspensions of 2 nm diameter iridium oxide (IrO _x·nH₂O) nanoparticles were obtained by hydrolyzing IrCl₆^2- in base at 90 °C to produce [Ir(OH) ₆]^2- and then treating with HNO₃ at 0 °C. UV-visible spectra show that acid condensation of [Ir(OH)₆] ^2- results in quantitative conversion to stable, ligand-free IrO _x·nH₂O nanoparticles, which have an extinction coefficient of 630 ± 50 M^-1cm^-1 at 580 nm. In contrast, alkaline hydrolysis alone converts only 30% of the sample to IrO _x·nH₂O at 2 mM concentration. The acidified nanoparticles are stable for at least one month at 2 °C and can be used to make colloidal solutions between pH 1 and 13. At pH 7 and above, some hydrolysis to form [Ir(OH)₆]^2- occurs. Uniform IrO_x ·nH₂O electrode films were grown anodically from pH 1 solutions, and were found to be highly active for water oxidation between pH 1 and 13.

Original language	English (US)
Pages (from-to)	402-406
Number of pages	5
Journal	Journal of Physical Chemistry Letters
Volume	2
Issue number	5
DOIs	https://doi.org/10.1021/jz200051c
State	Published - Mar 3 2011

All Science Journal Classification (ASJC) codes

Materials Science(all)
Physical and Theoretical Chemistry

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title = "A high yield synthesis of ligand-free iridium oxide nanoparticles with high electrocatalytic activity",

abstract = "Stable blue suspensions of 2 nm diameter iridium oxide (IrO x·nH2O) nanoparticles were obtained by hydrolyzing IrCl62- in base at 90 °C to produce [Ir(OH) 6]2- and then treating with HNO3 at 0 °C. UV-visible spectra show that acid condensation of [Ir(OH)6] 2- results in quantitative conversion to stable, ligand-free IrO x·nH2O nanoparticles, which have an extinction coefficient of 630 ± 50 M-1cm-1 at 580 nm. In contrast, alkaline hydrolysis alone converts only 30% of the sample to IrO x·nH2O at 2 mM concentration. The acidified nanoparticles are stable for at least one month at 2 °C and can be used to make colloidal solutions between pH 1 and 13. At pH 7 and above, some hydrolysis to form [Ir(OH)6]2- occurs. Uniform IrOx ·nH2O electrode films were grown anodically from pH 1 solutions, and were found to be highly active for water oxidation between pH 1 and 13.",

author = "Yixin Zhao and Hernandez-Pagan, {Emil A.} and Vargas-Barbosa, {Nella M.} and Dysart, {Jennifer L.} and Mallouk, {Thomas E.}",

year = "2011",

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doi = "10.1021/jz200051c",

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T1 - A high yield synthesis of ligand-free iridium oxide nanoparticles with high electrocatalytic activity

AU - Zhao, Yixin

AU - Hernandez-Pagan, Emil A.

AU - Vargas-Barbosa, Nella M.

AU - Dysart, Jennifer L.

AU - Mallouk, Thomas E.

PY - 2011/3/3

Y1 - 2011/3/3

N2 - Stable blue suspensions of 2 nm diameter iridium oxide (IrO x·nH2O) nanoparticles were obtained by hydrolyzing IrCl62- in base at 90 °C to produce [Ir(OH) 6]2- and then treating with HNO3 at 0 °C. UV-visible spectra show that acid condensation of [Ir(OH)6] 2- results in quantitative conversion to stable, ligand-free IrO x·nH2O nanoparticles, which have an extinction coefficient of 630 ± 50 M-1cm-1 at 580 nm. In contrast, alkaline hydrolysis alone converts only 30% of the sample to IrO x·nH2O at 2 mM concentration. The acidified nanoparticles are stable for at least one month at 2 °C and can be used to make colloidal solutions between pH 1 and 13. At pH 7 and above, some hydrolysis to form [Ir(OH)6]2- occurs. Uniform IrOx ·nH2O electrode films were grown anodically from pH 1 solutions, and were found to be highly active for water oxidation between pH 1 and 13.

AB - Stable blue suspensions of 2 nm diameter iridium oxide (IrO x·nH2O) nanoparticles were obtained by hydrolyzing IrCl62- in base at 90 °C to produce [Ir(OH) 6]2- and then treating with HNO3 at 0 °C. UV-visible spectra show that acid condensation of [Ir(OH)6] 2- results in quantitative conversion to stable, ligand-free IrO x·nH2O nanoparticles, which have an extinction coefficient of 630 ± 50 M-1cm-1 at 580 nm. In contrast, alkaline hydrolysis alone converts only 30% of the sample to IrO x·nH2O at 2 mM concentration. The acidified nanoparticles are stable for at least one month at 2 °C and can be used to make colloidal solutions between pH 1 and 13. At pH 7 and above, some hydrolysis to form [Ir(OH)6]2- occurs. Uniform IrOx ·nH2O electrode films were grown anodically from pH 1 solutions, and were found to be highly active for water oxidation between pH 1 and 13.

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A high yield synthesis of ligand-free iridium oxide nanoparticles with high electrocatalytic activity

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