氧化物—空气半燃料电池用贮氢合金电极的烧结制备及其电化学特性

Electrochemical Characteristics and Sintering Preparation of Metal Hydride Electrode for Air MH Semi fuel Cell Applications

摘要:

研究了应用在空气－氢化物半燃料电池上的制备配套金属氢化物厚型电极烧结技术，将贮氢合金与细镍粉和一定的添加剂形成浆料涂覆在泡沫镍基体，测试不同烧结参数对贮氢合金电极的电化学性能的影响，烧结电极合金的电化学活化特性和高倍率放电能力与传统的粘结式电极有较大的提高，为设计适合电动车用高能量密度空气－氢化物燃料电池，分别选用冲孔镍箔带，冲孔铜箔带和铜编织网作为集流体进行比较实验。结果表明，选定冲孔铜箔带是适宜于设计空气－氢化物燃料电池用厚型氢化物电极。

Abstract:

The powder sintered technology for manufacturing thick metal hydride electrodes has been extensively investigated. A slurry consisting of hydrogen storage alloy powder mixed with fine nickel powder and some additives was pasted onto the nickel foam as a current collector. By choosing adjustable sintering parameters, the composite metal hydride electrode was obtained. The effects of sintering parameters on the electrochemical properties of sintered metal hydride electrode have been characterized. The results showed that the activation and high rate discharge ability were greatly improved and comparable to that obtained with conventional pasting process for sintered hydride electrode. In order to design the thick metal hydride electrode Suitable for the oxygen diffusion electrode of airmetal hydride semi fuel cell, the electrochemical characteristics of thick metal hydride electrode were comparativly studied for different metal substrates, suchas perforated nickel strip, perforated copper foil and copper mesh. As a consequence, the thick metal hydride electrode employing the perforated copper foil as a current collector has been evaluated to be suitable for the airmetal Hydride semi fuel cell.