Carbon Felt Substrate Research Articles

Electrodeposition of Composite Ceria-Polyethylenimine Films

A combined electrophoretic-electrolytic deposition method was applied to the fabrication of composite organic-inorganic films. Composite films consisting of ceria and polyethylenimine (PEI) were obtained via cathodic electrodeposition on Ni, Pt, graphite and carbon felt substrates. By varying the concentration of PEI in solutions and the deposition time, the amount of deposited material and its composition could be controlled. The deposits were studied by X-ray diffraction, thermogravimetric analysis and SEM. A mechanism of electrochemical intercalation of the cationic polymer into ceria deposits is discussed.

Composite nickel hydroxide – polyelectrolyte films prepared by cathodic electrosynthesis

Composite films consisting of nickel hydroxide and cationic polyelectrolytes, such as polyethylenimine (PEI) and poly(diallyldimethylammonium chloride) (PDDA) were obtained via cathodic electrodeposition. Films up to 3 μm thick were obtained on Pt, graphite and carbon felt substrates. By varying the concentration of the polyelectrolytes in solutions and deposition time, the amount of the deposited material and its composition can be varied. The deposits were studied by thermogravimetric analysis, X-ray diffraction analysis and scanning electron microscopy. The mechanisms of electrochemical intercalation of the cationic polyelectrolytes into nickel hydroxide deposits are discussed.

Electrodeposition of lanthanum hydroxide–polyethylenimine films

Electrodeposition of lanthanum hydroxide–polyethylenimine films

鉛蓄電池用負極活物質の電解合成

An electrosynthesis method for lead used as a negative electrode active material for lead-acid batteries with high electrochemical activity and a conductive network was investigated. The lead was deposited on a conductive carbon felt substrate with a large surface area from various electrolytes by direct and pulse current. The lead deposits were uniform when they were obtained by pulse plating from an electrolyte with a high cathodic overvoltage. The optimun conditions were: 0.1mol·L-1 Pb (NO3)2+5.0mol·L-1 NaOH electrolyte, 0.01s pluse period, 0.5 duty ratio, 50C·cm-2 cathodic charge density, and 150mA·cm-2 current density. In this case, utilization of the lead deposits was 37%.

Kinetics of graphitization of carbon-felt/carbon-matrix composites

Kinetics of graphitization of carbon-felt/carbon-matrix composites