Journal
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
Volume 4, Issue -, Pages 649-654Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.4.72
Keywords
energy related; hydrogen peroxide; nanomaterials; nickel hexacyanoferrate; Prussian Blue; scanning electrochemical microscopy; ultramicroelectrodes
Funding
- Bundesministerium fur Bildung und Forschung [RUS 09/036]
- Russian Ministry for Science and Education [14.740.11.1374]
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We report here a way for improving the stability of ultramicroelectrodes (UME) based on hexacyanoferrate-modified metals for the detection of hydrogen peroxide. The most stable sensors were obtained by electrochemical deposition of six layers of hexacyanoferrates (HCF), more specifically, an alternating pattern of three layers of Prussian Blue and three layers of Ni-HCF. The microelectrodes modified with mixed layers were continuously monitored in 1 mM hydrogen peroxide and proved to be stable for more than 5 h under these conditions. The mixed layer microelectrodes exhibited a stability which is five times as high as the stability of conventional Prussian Blue-modified UMEs. The sensitivity of the mixed layer sensor was 0.32 A center dot M-1 center dot cm(-2), and the detection limit was 10 mu M. The mixed layer-based UMEs were used as sensors in scanning electrochemical microscopy (SECM) experiments for imaging of hydrogen peroxide evolution.
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