金属间化合物LaCo_(13)的电化学储氢性能研究

Electrochemical Hydrogen Storage Performance of Intermetallic Compound LaCo_(13)

研究了金属间化合物LaCo13的电化学储氢性能,分别考察了LaCo13电极的活化、电化学容量、温度特性、电位特性、循环寿命和高倍率放电性能,并采用电化学阻抗谱技术研究了LaCo13电极过程的动力学性能。结果表明,LaCo13在电解液中具有较高的电化学容量和良好的循环寿命,温度由30℃升高到60℃时,LaCo13电极的电化学容量从339升高到388 mAh.g-1,但放电平台压较低,高倍率放电性能不如AB5型合金。LaCo13电极过程动力学性能表明,其吸放氢是由电化学反应和氢的扩散混合控制。

The electrochemical hydrogen storage properties of intermetallic compound LaCo13, such as the activation, electrochemical hydrogen storage capacity, temperature characteristics, potential property, cycling lifetime, high-rate dischargability property and kinetics characteristics, were studied. The experimental results showed that LaCo13 electrode had high electrochemical charge/discharge capacity and good cycle lifetime in alkaline electrolyte. With increasing tern-perature from 30 to 60 ℃ the electrochemical capacity of LaCo13 electrode increased from 339 to 388 mAh· g^-1. However, compared with that of ABs-type alloys, LaCo13 electrode showed lower discharging potential and poorer kinetics characteristic. The measurement results of showed th process of by charge electrochemical impedance spectroscopy at the hydrogen absorption and desorption LaCo13 electrode was conjunctly controlled transfer reaction and hydrogen diffusion.