Potential-induced sonoelectrochemical graphene nanosheets with vacancies as hydrogen peroxide reduction catalysts and sensors |
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| Institution: | 1. Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807, Taiwan;2. Department of Seafood Science, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan;3. Department of Mechatronics Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan |
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| Abstract: | Defective graphene nanosheets (dGN4V) with 5-9, 5-8-5, and point defects were synthesised by a sonoelectrochemical method, where a potential of 4 V (vs. Ag/AgCl) was applied to drive the rapid intercalation of phosphate ions between the layers of the graphite foil as a working electrode. In addition to these vacancies, double vacancy defects were also created when the applied potential was increased to 8 V (dGN8V). The defect density of dGN8V (2406 μm?2) was higher than that of dGN4V (1786 μm?2). Additionally, dGN8V and dGN4V were applied as catalysts for the hydrogen peroxide reduction reaction (HPRR). The mass activity of dGN8V (1.31 × 10?2 mA·μg?1) was greater than that of dGN4V (1.17 × 10?2 mA·μg?1) because of its high electrochemical surface area (ECSA, 1250.89 m2·g?1) and defect density (ND, 2406 μm?2), leading to low charge transfer resistance on the electrocatalytic interface. The ECSA and ND of dGN4V were 502.7 m2·g?1 and 1786 μm?2, respectively. Apart from its remarkable HPRR activity, the cost-effective dGN8V catalyst also showed potential as an amperometric sensor for the determination of H2O2. |
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| Keywords: | Defect effect Ultrasound Specific activity Reaction kinetics Amperometric sensor |
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