A simple and novel method for preparing Ni(OH)2. I. Structural Studies and Voltammetric Response.

M.J. AVENA; M.V. VÁZQUEZ; R.E. CARBONIO; C.P. DE PAULI; V. A. MACAGNO

JOURNAL OF APPLIED ELECTROCHEMISTRY

SPRINGER

Lugar: Berlin; Año: 1994 vol. 23 p. 256 - 260

0021-891X

Ni/Ni(OH)2 electrodes were prepared by in situ precipitation of nickel hydroxide into porous nickel substrates. The thermal decomposition of urea in solutions containing Ni 2+ was used for the synthesis of the active material. The c o m p o u n d prepared by this method was a poorly crystallized/3(ii)-type phase. The electrochemical behaviour of Ni/Ni(OH)2 electrodes thus prepared was studied by cyclic voltamperommetry and the efficiency of the in situ precipitation was followed by the measurement of the cathodic charge obtained from t h e j - E response. The amount of incorporated material depends on the urea concentration and the electrochemical response of the electrodes was improved by increasing the number of impregnation cycles.