Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane
The understanding and tailoring of the electrochemistry of graphite is of significant industrial importance. We develop a method of etching pits into the basal planes of highly oriented pyrolytic graphite (HOPG) by electrolysis. The etching of HOPG was realized by performing electrochemical reaction...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2018
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| Online Access: | https://hdl.handle.net/10356/87211 http://hdl.handle.net/10220/44382 |
| _version_ | 1811689731493199872 |
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| author | An, Hongjie Moo, James Guo Sheng Tan, Beng Hau Liu, Sheng Pumera, Martin Ohl, Claus-Dieter |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences An, Hongjie Moo, James Guo Sheng Tan, Beng Hau Liu, Sheng Pumera, Martin Ohl, Claus-Dieter |
| author_sort | An, Hongjie |
| collection | NTU |
| description | The understanding and tailoring of the electrochemistry of graphite is of significant industrial importance. We develop a method of etching pits into the basal planes of highly oriented pyrolytic graphite (HOPG) by electrolysis. The etching of HOPG was realized by performing electrochemical reactions at alternating potentials at room temperature, and the resulting membranes are characterized using atomic force microscopy, scanning electron microscopy, X-ray photoelectron spectra, X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectrscopy, and cyclic voltammetry. Etching only occurs when the electrolysis at negative bias is followed by a brief switch to a positive bias. The size of the etched pits can be tuned by varying the applied potential and reaction time, with deeper pits formed with increased redox cycles and reaction time. Cyclic voltammetry reveals that the electrochemical performance is enhanced greatly as etching progresses due to exposure of edge sites. For its ease of application, efficiency and low cost, our wet etching approach has great promise as a method to develop high active electrodes and nanoporous membranes at large scales for various industrial applications. |
| first_indexed | 2024-10-01T05:52:46Z |
| format | Journal Article |
| id | ntu-10356/87211 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:52:46Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/872112023-02-28T19:32:07Z Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane An, Hongjie Moo, James Guo Sheng Tan, Beng Hau Liu, Sheng Pumera, Martin Ohl, Claus-Dieter School of Physical and Mathematical Sciences Electrochemistry Graphite The understanding and tailoring of the electrochemistry of graphite is of significant industrial importance. We develop a method of etching pits into the basal planes of highly oriented pyrolytic graphite (HOPG) by electrolysis. The etching of HOPG was realized by performing electrochemical reactions at alternating potentials at room temperature, and the resulting membranes are characterized using atomic force microscopy, scanning electron microscopy, X-ray photoelectron spectra, X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectrscopy, and cyclic voltammetry. Etching only occurs when the electrolysis at negative bias is followed by a brief switch to a positive bias. The size of the etched pits can be tuned by varying the applied potential and reaction time, with deeper pits formed with increased redox cycles and reaction time. Cyclic voltammetry reveals that the electrochemical performance is enhanced greatly as etching progresses due to exposure of edge sites. For its ease of application, efficiency and low cost, our wet etching approach has great promise as a method to develop high active electrodes and nanoporous membranes at large scales for various industrial applications. NRF (Natl Research Foundation, S’pore) ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) Accepted version 2018-02-02T03:51:06Z 2019-12-06T16:37:19Z 2018-02-02T03:51:06Z 2019-12-06T16:37:19Z 2017 Journal Article An, H., Moo, J. G. S., Tan, B. H., Liu, S., Pumera, M., & Ohl, C.-D. (2017). Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane. Carbon, 123, 84-92. 0008-6223 https://hdl.handle.net/10356/87211 http://hdl.handle.net/10220/44382 10.1016/j.carbon.2017.07.029 en Carbon © 2017 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Carbon, Elsevier Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.carbon.2017.07.029]. 19 p. application/pdf |
| spellingShingle | Electrochemistry Graphite An, Hongjie Moo, James Guo Sheng Tan, Beng Hau Liu, Sheng Pumera, Martin Ohl, Claus-Dieter Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane |
| title | Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane |
| title_full | Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane |
| title_fullStr | Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane |
| title_full_unstemmed | Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane |
| title_short | Etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane |
| title_sort | etched nanoholes in graphitic surfaces for enhanced electrochemistry of basal plane |
| topic | Electrochemistry Graphite |
| url | https://hdl.handle.net/10356/87211 http://hdl.handle.net/10220/44382 |
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