Abstract
Considering literature of electrochemical impedance spectroscopy (EIS) it was discovered that for calculation of the value of double-layer capacitance (Cdl) from the constant phase element (CPE) two equations, with or without solution resistance (Rs) could be used. After calculation of Cdl for defined values of CPE constant Ydl, CPE exponent , Rs and charge transfer resistance (Rct), it was confirmed in this work that different results for Cdl were obtained by including Rs in the calculation of Cdl. It was also stated that "it is quite difficult to understand how both parameters (Rct and Rs) could be expressed by the same time constant, i.e. the same parameter ." By investigating the hydrogen evolution reaction (HER) at Ni mesh 40 electrode in the solution of 1 M KOH at 25 oC using EIS measurements, it was shown that different Cdl vs. E plots were obtained using these two equations for Cdl calculation. A simple solution to avoid this problem with detailed explanation, the use of equation without Rs , has been suggested in this work.
Publisher
Centre for Evaluation in Education and Science (CEON/CEES)
Subject
General Materials Science
Reference43 articles.
1. J.B.Jorcin, M.E.Orazem, N.Pebere, B.Tribollet (2006) CPE analysis by local electrochemical impedance spectroscopy, Electrochim. Acta, 51, 1473-1479;
2. A.Lasia, in: R.E.White, B.E.Conway, J.O'M.Bockris (Eds.), Modern Aspects of Electrochemistry, 32, Kluwer Academic/Plenum Publishers, New York, 1999, p. 143;
3. L.Nyikos, T.Pajkossy (1985) Fractal dimension and fractional power frequency-dependent impedance of blocking electrodes, Electrochim. Acta, 30 1533-1540;
4. B.Sapoval (1995) Linear and non-linear behavior of fractal and irregular electrodes, Solid State Ionics 75, 269-273;
5. Z.Kerner, T.Pajkossy (1998) Impedance of rough capacitive electrodes: The role of surface disorder, J. Electroanal. Chem., 448, 139-142;
Cited by
10 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献