The cavity-microelectrode as a tip for scanning electrochemical microscopy |
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| Institution: | 1. Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133, Milano, Italy;2. Istituto Nazionale di Scienza e Tecnologia dei Materiali, Milan Unit, Via Golgi 19, 20133, Milano, Italy;1. School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-713, South Korea;2. Advanced Materials Division, Korea Research Institute of Chemical Technology, Yuseong, Daejeon 305-60, South Korea;1. Center for Fuel Cell Innovation, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China;2. Research Center for Engineering Technology of Polymeric Composites of Shanxi Province, School of Materials Science and Engineering, North University of China, TaiYuan 030051, China |
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| Abstract: | In this work, we present and discuss the use of cavity-microelectrodes (C-MEs) used as tip for the scanning electrochemical microscopy (SECM). Cavity-microelectrodes can be filled with a desired finely dispersed material thus compensating for the limited commercial availability of microwires. After discussing the possibility of filling and emptying a cavity-microelectrode with a desired tip shape, the consistency of negative and positive feedback approach curves obtained after filling a Au C-ME was verified. In addition, the tip/C-ME was tested under gas (oxygen) evolution condition, in order to demonstrate that the filling is stable in a wide range of gas fluxes thus extending the possible applications to tip generation/substrate collection mode. Finally, we introduce the use of the proposed system to quantify the rates of parallel reactions occurring at the material inserted in the tip under the tip generation/substrate collection mode. |
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