High surface area diamond-like carbon electrodes grown on vertically aligned carbon nanotubes |
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| Affiliation: | 1. School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, United Kingdom;2. National Institute for Space Research, Av. dos Astronautas 1758, Sao Jose dos Campos 12227-010, SP, Brazil;1. Department of Chemistry, Theivanai Ammal College for Women (Autonomous), Villupuram 605 401, Tamil Nadu, India;2. School of Chemistry, Bharathidasan University, Tiruchirappalli, India;3. Photocatalysis and Nanotechnology, Institut für Technische Chemie, Gottfried Wilhelm Leibniz Universität Hannover, Callinstrasse 3, D-30167 Hannover, Germany;4. School of Chemistry, Madurai Kamaraj University, Madurai, India;5. Environment and Sustainability Institute, University of Exeter, Penryn, United Kingdom;1. Department of Materials Science, School of Chemistry, Madurai Kamaraj University, Madurai-21, India;2. Department of Chemistry, King Khalid University, Abha, 61413, Saudi Arabia;3. Institute of Ocean and Earth Sciences (IOES), University of Malaya, 50603, Kuala Lumpur, Malaysia;4. Faculty of Applied Sciences, UCSI University, 56000, Kuala Lumpur, Malaysia;5. Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, 625021, India;1. School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore;2. Cambridge CARES, CREATE Tower, 1 CREATE Way Singapore, 138602, Singapore;3. Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China;4. School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China;1. Department of Physical Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India;2. Department of Life Science, Department of Energy Storage/Conversion Engineering of Graduate School, and Hydrogen and Fuel Cell Research Center, Chonbuk National, University, Jeollabuk-do 54896, Republic of Korea;1. Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar-140001, India;2. Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India |
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| Abstract: | Electrochemically active diamond-like carbon (DLC) electrodes featuring high specific surface area have been prepared by plasma-enhanced chemical vapour deposition (CVD) onto densely packed forests of vertically aligned multiwall carbon nanotubes (VACNTs). The DLC:VACNT composite film exhibits a complex topography with web like features and ridges generated by partial coalescence of the DLC over the CNT arrays. DLC:VACNT electrodes exhibit low background responses over a large potential window, low uncompensated resistance, as well as low charge-transfer impedance in the presence of ferrocyanide as a redox probe. The interfacial capacitance associated with the DLC:VACNT electrode is in the range of 0.6 mF cm?2, a value two orders of magnitude larger than in conventional flat carbon electrodes. DLC films grown onto single-crystal Si(1 0 0) under identical conditions resulted in essentially insulating layers. Conducting-atomic force microscopy studies reveal that the film electro-activity does not arise from specific topographic features in the highly corrugated film. The ensemble of experimental results suggests that the enhanced electrochemical responses are not connected to areas in which the CNT support is exposed to the electrolyte solution. This is remarkable behaviour considering that no dopants have been included during the DLC film growth. |
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