A parametric study of the carbon black slurry electrode

✍ Scribed by Gabriele Heydecke; F Beck

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 871 KB
• Volume: 28
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(90)90004-i

✦ Synopsis

Slurry electrodes in 1 M HIPO, made from carbon blacks with specific surface areas ranging from 28 to 1475 m* g-l were studied by cyclovoltammetry (5 mV s-l) at potentials ranging from -0.1 V to + 2.3 V vs. SHE. The main parameters affecting the electrode performance were investigated in detail, i.e., carbon black concentration cR, stirring rate n, voltage scan rate u,, feeder material and structure, and potential of positive scan reversal. High stirring rates (n > 100 rpm) were crucial as well as low voltage scan rates (u, < 10 mV s-l) and an inert feeder of Pt or Au with a grid structure. Smooth sheets and other materials were inefficient. Optimal carbon black concentrations cR were in the range of 0.1-l g/l. Only at the very positive potentials of scan reversal, quoted above, could all features of the anodic current voltage curves, charging of a large double layer capacity at low potentials and irreversible surface oxidation at more positive potentials be observed. All findings can be rationalized with a model of a thin layer adhering to the feeder electrode in a steady state.