Pt-grown carbon nanofibers for detection of hydrogen peroxide

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Title: Pt-grown carbon nanofibers for detection of hydrogen peroxide
Authors: Isoaho, Noora | Sainio, Sami | Wester, Niklas | Botello, Luis | Johansson, Leena-Sisko | Peltola, Emilia | Climent, Victor | Feliu, Juan M. | Koskinen, Jari | Laurila, Tomi
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Pt catalyst | Carbon nanofibers | Hydrogen peroxide
Knowledge Area: Química Física
Issue Date: 3-Apr-2018
Publisher: Royal Society of Chemistry
Citation: RSC Advances. 2018, 8: 12742-12751. doi:10.1039/C8RA01703D
Abstract: Removal of left-over catalyst particles from carbon nanomaterials is a significant scientific and technological problem. Here, we present the physical and electrochemical study of application-specific carbon nanofibers grown from Pt-catalyst layers. The use of Pt catalyst removes the requirement for any cleaning procedure as the remaining catalyst particles have a specific role in the end-application. Despite the relatively small amount of Pt in the samples (7.0 ± 0.2%), they show electrochemical features closely resembling those of polycrystalline Pt. In O2-containing environment, the material shows two separate linear ranges for hydrogen peroxide reduction: 1–100 μM and 100–1000 μM with sensitivities of 0.432 μA μM−1 cm−2 and 0.257 μA μM−1 cm−2, respectively, with a 0.21 μM limit of detection. In deaerated solution, there is only one linear range with sensitivity 0.244 μA μM−1 cm−2 and 0.22 μM limit of detection. We suggest that the high sensitivity between 1 μM and 100 μM in solutions where O2 is present is due to oxygen reduction reaction occurring on the CNFs producing a small additional cathodic contribution to the measured current. This has important implications when Pt-containing sensors are utilized to detect hydrogen peroxide reduction in biological, O2-containing environment.
Sponsor: Academy of Finland (E. P. grant #274670, T. L. grant #285526), Biocentrum Helsinki and Finnish Cultural Foundation are acknowledged for funding. J. F. and V. C. acknowledge financial funding from the Ministerio de Economia, Industria y Competitividad (CTQ2016-76221 P).
ISSN: 2046-2069
DOI: 10.1039/C8RA01703D
Language: eng
Type: info:eu-repo/semantics/article
Rights: This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence
Peer Review: si
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