Effects of microstructure of carbon nanofibers for amperometric detection of hydrogen peroxide
Carbon nanofibers (CNFs) with three microstructures, including platelet-carbon nanofibers (PCNFs), fish-bone-carbon nanofibers (FCNFs), and tube-carbon nanofibers (TCNFs), were synthesized, characterized, and evaluated for electrochemical sensing of hydrogen peroxide. The CNFs studied here show micr...
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Published in | Analytica chimica acta Vol. 597; no. 2; pp. 238 - 244 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
10.08.2007
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Carbon nanofibers (CNFs) with three microstructures, including platelet-carbon nanofibers (PCNFs), fish-bone-carbon nanofibers (FCNFs), and tube-carbon nanofibers (TCNFs), were synthesized, characterized, and evaluated for electrochemical sensing of hydrogen peroxide. The CNFs studied here show microstructures with various stacked morphologies. The sizes and graphite-layer ordering of the CNFs can be well controlled. Glassy carbon (GC) electrodes modified by CNFs were fabricated and compared for amperometric detection of hydrogen peroxide. Sensors based on PCNFs/GC, FCNFs/GC, and TCNFs/GC were used in the amperometric detection of H
2O
2 in solution by applying a potential of +0.65
V versus Ag/AgCl at the working electrode. The highest electrocatalytic performance was observed for PCNFs/GC among the three types of hydrogen peroxide sensors. The amperometric response of PCNFs/GC retained over 90% of the initial current of the first day up to 21 days. The linear range is from 1.80
×
10
−4 to 2.62
×
10
−3
M with a correlation coefficient larger than 0.999 and with a detection limit of 4.0
μM H
2O
2 (S/N
=
3). The relative standard deviation for detecting 1.80
×
10
−4
M H
2O
2 (
N
=
8) is 2.1% with an average response of 0.64
μA. The significant diversity of electrocatalytic activity of the CNFs toward the oxidation of hydrogen peroxide may result from the difference of morphologies, textural properties, and crystalline structures. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 USDOE AC05-76RL01830 PNNL-SA-57691 |
ISSN: | 0003-2670 1873-4324 |
DOI: | 10.1016/j.aca.2007.06.046 |