Journal
CARBON
Volume 171, Issue -, Pages 814-818Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.09.069
Keywords
Boron doped diamond; Dopamine; Attenuated total reflection infrared spectroscopy; Infrared reflection absorption spectroscopy
Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [19H05048]
- Nippon Sheet Glass Foundation for Materials Science and Engineering, Japan
- Grants-in-Aid for Scientific Research [19H05048] Funding Source: KAKEN
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The oxidation of dopamine on a boron-doped diamond electrode was investigated using in situ attenuated total reflection infrared spectroscopy and infrared reflection absorption spectroscopy. The study revealed that dopamine oxidation led to polymerization and the continuous deposition of polymerized dopamine on the electrode, resulting in irreversible behavior of the voltammogram.
The oxidation of dopamine (DA) on a boron-doped diamond (BDD) electrode was investigated using in situ attenuated total reflection infrared spectroscopy (ATR-IR) and infrared reflection absorption spectroscopy (IRAS). Voltammogram showed multiple anodic/cathodic peaks for the oxidation/reduction of DA and its oxidized derivatives on the BDD electrode. The oxidation/reduction species on the surface and in solution were assigned using ATR-IR and IRAS, respectively. The anodic oxidation of DA promoted polymerization, and the polymerized DA (PDA) was continuously deposited on BDD without being reduced by potential cycles, which resulted in the irreversible behavior of the voltammogram. A decrease in the oxidation current of DA by potential cycles was due to the deposition of PDA. Some intermediate quinone species, such as dopaminequinone and dopaminechrome, were reversibly reduced to hydroquinone. (C) 2020 Elsevier Ltd. All rights reserved.
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