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Nanoscale electrocatalysis of hydrazine electro-oxidation at blistered graphite electrodes
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E, Sharel P., Kim, Yang-Rae, Perry, David, Bentley, Cameron Luke and Unwin, Patrick R. (2016) Nanoscale electrocatalysis of hydrazine electro-oxidation at blistered graphite electrodes. ACS Applied Materials & Interfaces, 8 (44). pp. 30458-30466. doi:10.1021/acsami.6b10940 ISSN 1944-8244.
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Official URL: http://dx.doi.org/10.1021/acsami.6b10940
Abstract
There is great interest in finding and developing new, efficient, and more active electrocatalytic materials. Surface modification of highly oriented pyrolytic graphite, through the introduction of surface “blisters”, is demonstrated to result in an electrode material with greatly enhanced electrochemical activity. The increased electrochemical activity of these blisters, which are produced by electro-oxidation in HClO4, is revealed through the use of scanning electrochemical cell microscopy (SECCM), coupled with complementary techniques (optical microscopy, field emission-scanning electron microscopy, Raman spectroscopy, and atomic force microscopy). The use of a linear sweep voltammetry (LSV)-SECCM scan regime allows for dynamic electrochemical mapping, where a voltammogram is produced at each pixel, from which movies consisting of spatial electrochemical currents, at a series of applied potentials, are produced. The measurements reveal significantly enhanced electrocatalytic activity at blisters when compared to the basal planes, with a significant cathodic shift in the onset potential of the hydrazine electro-oxidation reaction. The improved electrochemical activity of the hollow structure of blistered graphite could be explained by the increased adsorption of protonated hydrazine at oxygenated defect sites, the ease of ion–solvent intercalation/deintercalation, and the reduced susceptibility to N2 nanobubble attachment (as a product of the reaction). This study highlights the capability of electrochemistry to tailor the surface structure of graphite and presents a new electrocatalyst for hydrazine electro-oxidation.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||||
Library of Congress Subject Headings (LCSH): | Electrochemistry -- Materials, Electrocatalysis , Graphite | ||||||||
Journal or Publication Title: | ACS Applied Materials & Interfaces | ||||||||
Publisher: | American Chemical Society | ||||||||
ISSN: | 1944-8244 | ||||||||
Official Date: | 14 October 2016 | ||||||||
Dates: |
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Volume: | 8 | ||||||||
Number: | 44 | ||||||||
Page Range: | pp. 30458-30466 | ||||||||
DOI: | 10.1021/acsami.6b10940 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 25 January 2017 | ||||||||
Date of first compliant Open Access: | 14 October 2017 | ||||||||
Funder: | European Research Council (ERC), Australia. Department of Education and Training (DET), Engineering and Physical Sciences Research Council (EPSRC), University of Warwick. Molecular Organisation and Assembly in Cells, Han'guk Haksul Chinhŭng Chaedan [Korea Research Foundation] (HHCC), University of Warwick Chancellor’s Interational Scholarship | ||||||||
Grant number: | ERC-2009-AdG 247143 QUANTIF (ERC), Endeavour Fellowship Programme (DET), Grant No. EP/F5003 78/1 (EPSRC), 2016R1C1B2011912 (HHCC) |
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