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If a computer data acquisition system is used, the current integration is possible by software. In principle, a further inexpensive method is to work at constant cell voltage. But here the potentials of the working and of the counter electrode, and all voltage drops of the electrolytes and of the cell separator are included (see Fig. 2). Thus, in most cases, clearly deﬁned conditions at the working electrode cannot be adjusted using this operation mode (nevertheless, because of its uncomplicated realization, it is applied in most technical electrolyses to achieve approximately the desired cell current).
G. [43, 44]). 2 Smooth or Porous Electrodes The porosity of an electrode surface will signiﬁcantly inﬂuence its electrochemical behavior, especially because of a considerable decrease of the effective current density in case of materials with a high microporosity and consequently a large effective surface area. 1 45 46 2 Practical Aspects of Preparative Scale Electrolysis reactions that are impossible at smooth platinum. A similar material is Raney nickel. But also a simple roughening of an electrode surface, for example, by etching, may be advantageous.
As is usual for ceramics, the ready-formed material is hard and brittle, the possibilities of machining are restricted (diamond tools). The electrocatalytic activity of Ebonex is low, the overvoltages for oxygen and hydrogen are very high. Additionally, to its direct application as electrode material, it is an interesting carrier material for electrode coatings. Even very thin layers of the coating show only the electrochemical properties of the coating but not of the carrier [32–34]. 9 Coated Electrodes and Carrier Materials Numerous interesting electrode materials are applicable exclusively in the form of a coating on a carrier material.
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