Gas-Generating Porous Electrodes: Chlorine Generation in DSA at Low and Intermediate Overpotentials
- Cite this article as:
- Pshenichnikov, A.G., Chirkov, Y.G. & Rostokin, V.I. Russian Journal of Electrochemistry (2002) 38: 213. doi:10.1023/A:1016832702152
- 66 Downloads
Parameters of gas-generating porous electrodes (GPE) in the range of low overpotentials, where all the pores are filled with electrolyte and the gas generation and transport occur in an internal diffusion mode, are calculated and analyzed. A criterion for estimating critical overpotential values, upon achieving which first gas pores start appearing in GPE, is found. Theoretical critical overpotentials of chlorine generation in DSA satisfactorily agree with experiment. About 20% of porous space takes part in the chlorine generation in DSA of “standard” thickness (5 μm), provided there are no limitations on chlorine transport outside the electrode. The appearance of the “low-polarizability” part in the anodic branch of polarization curve for DSA is caused by the appearance, in GPE, of a system of gas pores connected with each other and the front electrode surface. This assumption is partially confirmed by theoretical estimation.