Electrochemical impregnation of nickel hydroxide in porous electrodes

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6956341

Ho, K C

The nickel hydroxide electrode is widely used in several alkaline storage batteries. It is usually manufactured by a chemical impregnation process. A relatively new electrochemical impregnation process is investigated in which the nickel hydroxide is directly precipitated within the porous nickel electrode following the electrochemical reduction of nickel nitrate solution. An experimental and theoretical study was conducted to investigate the electrochemical impregnation of nickel hydroxide in porous electrode. The reduction of nitrate was initially conducted at a rotating nickel electrode in acidic 3.0 M nickel nitrate solution at various pH. The rate of nitrate reduction in acidic solution is hydrogen-ion diffusion-limited. The impregnation of nickel hydroxide was conducted in a static porous nickel electrode. It is concluded that the loading level and the plaque expansion are the important parameters to be considered. A mathematical model describes the transport of the nitrate, nickel, and hydroxyl ions and the consecutive heterogeneous electrochemical reduction of nitrate and the homogeneous precipitation reaction of nickel hydroxide. The model is applied to the simplified case of flat electrode and to the practical case of impregnation within the porous electrode.

• Research Organization: Rochester Univ., NY (USA)
• OSTI ID: 6956341
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
DIFFUSION
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRODES
HYDROGEN COMPOUNDS
HYDROXIDES
IMPREGNATION
MATHEMATICAL MODELS
NICKEL COMPOUNDS
NICKEL HYDROXIDES
OXYGEN COMPOUNDS
POROSITY
TRANSITION ELEMENT COMPOUNDS