钛镍金属互化物的化学合成及其阴极贮氢作用

THE CHEMICAL SYNTHESIS AND THE CATHODIC STORING HYDROGEN EFFECT OF TITANIUM NICKELIDE INTERMETALLIC COMPOUNDS

本文提出一种用共沉淀还原扩散法制备钛镍金属互化物的方法,详细讨论了共沉淀还原扩散过程,合成了比表面高、电催化活性良好的钛镍金属互化物。

Titanium nickelide intermetallic compounds have been prepared by means of coprecipitation-reduction followed by diffusion processes, in order to obtain the cathodic material with improved hydrogen absorbing character.Titanium-nickel hydroxides are first precipited by NaOH from mixed solution of NiCl_(2) and TiCl_(4). After dehydration at 600℃, the mixed hydroxide is reduced by CaH_(2) to give hydrided TiNi and Ti2Ni.The coprecipitation-reduction and diffution process has been discussed in detail. The lattice parameters of TiNiH_(1.14) and TiNiH_(2).56 are 24.85A and 11.91A.The temperature-composition dissociation isobars at 1 atm. for the product and potential-time plots of TiNi and Ti2Ni electrodes have been drawn respectively. The discharge capacities were determined as 262.2 mAh/g for TiNiH_(1.14) and 169.9 mAh/g for Ti2NiH_(2).56.Since the product has higher specific surface and excellent electro-catalytic activity, electrodes made from the product have much important effect on decreasing the polarization and increasing the cycle life.