Electrochimica Acta 51 (2005) 333–339 Reference values of the diffusion-limited chronoamperometric current at a microband electrode D. Britz a, ∗ , K. Poulsen a , J. Strutwolf b a Dept. of Chemistry, Aarhus University, 8000 ˚ Arhus C, Denmark b Institut f ¨ ur Organische Chemie, Universit¨ at T ¨ ubingen, Auf der Morgenstelle 18, 72076 T¨ ubingen, Germany Received 15 February 2005; received in revised form 26 April 2005; accepted 28 April 2005 Available online 13 June 2005 Abstract This paper provides reference values of the diffusion-limited current at a microband electrode, mounted flush in an insulating plane, as a response to a potential jump, over the time region for which currently there are no satisfactory analytical solutions. The current values are better than 0.1% accurate and are spaced in a temporal sequence over the critical time range so that simple interpolation can yield the current at any point in between, with the same accuracy. This provides a standard of comparison for other simulation programs. © 2005 Elsevier Ltd. All rights reserved. Keywords: Computational electrochemistry; Digital simulation; Microelectrodes 1. Introduction 1.1. Band simulations Aoki et al. [1] simulated the microband electrode (here- after MBE), using the explicit method, to support the theory in the paper. Coen et al. [2] used the integral equation method; this was speeded up in 1999 by Cope and Tallman [3]. Deakin et al. [4] used hopscotch [5–7] and a conformal map for sim- ulation economy (see below). Alden et al. [8–10] used the strongly implicit method (SIP [11,12]) for simulation of the MBE with and without convection. Jin et al. used the integral equation approach [13], and also the method called “finite an- alytic method” (FAM) [14] on a microring electrode, which in the extreme case of a very thin ring becomes identical with a MBE. Dual MBEs were simulated for the electrochemical titra- tion technique without convection [15] and with convection [16]. ∗ Corresponding author. Tel.: +45 89423874; fax: +45 86196699. E-mail addresses: britz@chem.au.dk (D. Britz); kim@enilmik.dk (K. Poulsen); joerg.strutwolf@uni-tuebingen.de (J. Strutwolf) The MBE is often used in channel flow experiments and there is a large literature on the simulation of that. Since this paper focusses on the MBE in a stationary solution, it will suffice to name just two recent papers on the channel flow case [17,18]. The above selection of the literature on the mi- croband electrode serves to emphasize that there is inter- est in this system and thus a need for reference current values. In the present study, the aim was to provide 0.1% accu- rate current values for the MBE under chronoamperometric (Cottrell-like) conditions, for which there appears to be a need, since there is large gap of time values for which no very accurate solutions exist, and to identify the time range for which the best available solutions do not work. The 0.1% level was chosen so as to be well below the experimentally achievable 1% level for comparison with experiment, and for comparison with possible future simulation work. The paper is a follow-up work of [19], in which the same was done for the microdisk electrode. Current values for the MBE are tabulated below for a number of time values after on- set of the potential jump, and time values in between those tabled can be interpolated to 0.1% accuracy, as will also be demonstrated. 0021-9673/$ – see front matter © 2005 Elsevier Ltd. All rights reserved. doi:10.1016/j.electacta.2005.04.030