多孔硅基微型直接甲醇燃料电池用催化电极的制备  

Preparation of Porous-Silicon-Based Electrocatalytic Electrodes for Micro Direct Methanol Fuel Cell

作　　者：刘晓为[1] 索春光[1] 张宇峰[1] 张博[1] 胡泽先[1] 

机构地区：[1]哈尔滨工业大学MEMS中心,哈尔滨150001

出　　处：《传感技术学报》2006年第05B期2167-2170,共4页Chinese Journal of Sensors and Actuators

基　　金：国防973项目资助(51322)

摘　　要：针对硅基微型直接甲醇燃料电池小型化的需要,提供一种新型多孔硅基催化电极的制备方法,即采用硅片阳极氧化的方法首先得到多孔硅作为催化电极的基底材料,然后采用化学镀铂及铂钌的方法分别在多孔硅上沉积出催化剂镀层,制备出阴极和阳极催化电极.多孔硅具有巨大的比表面积,使化学镀的催化剂层拥有不连续的三维结构,能显著的增加催化剂的活性面积,同时化学镀液中贵金属的利用率高达95%,可以有效地节约贵金属用量.研究中采用扫描电镜(SEM),X射线衍射(XRD),能量色散X射线分析(EDX)对多孔硅的形貌及催化剂层的物理性能进行了分析.In order to further miniaturize the silicon-based micro direct methanol fuel cell （μDMFC）, a novel method of fabricating electrocatalytic electrodes were introduced. A porous silicon （PS） layer is formed by anodic etching in a HF-ethanol solution which is considered an effective and cheap fabrication method. The anodic and cathodal catalyst layer were formed using electroless plating platinum or platinum and ruthenium （Pt-Ru） co-deposition over PS substrates. Catalyst being deposited on PS brings three-dimensional features, and the non-planar interfaces for the catalytic electrodes will increase the active surface area within a stated volume. Additionally, as high as 95 % the utilization ratio of noble metal in electroless plating solution leads economizing platinum and ruthenium. SEM, XRD, EDX were employed to analysis the PS and catalyst layer.

关 键 词：微型直接甲醇燃料电池 多孔硅 催化电极 化学镀 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O482.31[理学—固体物理]