期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 2, 期 2, 页码 81-84出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/S1388-2481(99)00150-2
关键词
ultrafast cyclic voltammetry; megavolt per second scan rates; ultramicroelectrodes
A new concept of a three-electrode potentiostat involving positive feedback compensation of ohmic drop is used to investigate nanosecond time scales by allowing the recording of ohmic drop-foe voltammograms at scan rates of a few megavolts per second. This range of scan rates corresponds to the development of diffusion layers whose widths are only a few nanometers thick. Independent tests on dummy cells (Bode plots) demonstrated that the potentiostat behaved excellently in the megavolt per second range. Examination of the well-established voltammetric reduction of anthracene in highly concentrated (0.9 M) supporting electrolyte confirmed that this potentiostat allowed the recording of undistorted ohmic drop-free voltammograms up to 2.25 MV s(-1). (C) 2000 Elsevier Science S.A. All rights reserved.
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