SUO Chun-guang, CHEN Wei-ping, LIU Xiao-wei. Preparation of MEMS-based micro direct methanol fuel cell[J]. 2008, (9): 118-120. DOI: 10.13873/j.1000-97872008.09.004.
基于MEMS技术的微型直接甲醇燃料电池的制作
摘要
为了进一步简化微型直接甲醇燃料电池(μDMFC)系统
便于电池批量生产
采用MEMS技术制作μDMFC。电池的制作包括传统的MEMS工艺
如
氧化、光刻、湿法刻蚀、硅—玻璃键合等方法
还包括一种新的催化电极制备方法
即采用硅片阳极氧化的方法。首先
制得多孔硅(PS)作为催化电极的基底
然后
采用化学镀法分别在PS上沉积出Pt阴极催化电极和Pt-Ru阳极催化电极。PS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)
能量色散X射线分析(EDX)对催化剂层的形貌和成分等物理性能进行了分析。
Abstract
In order to further simplify the micro direct methanol fuel cell(μDMFC)systems
MEMS technology is employed to batch fabricate μDMFC.Conventional MEMS processes
such as thermal oxidation
optical lithography
wet etching and anodic bonding are included.Furthermore
a novel method of fabricating electrocatalytic electrodes is introduced.First a porous silicon(PS)layer is formed by anodic etching in a HF-ethanol solution.Then the anodic and cathodal catalyst layer are formed by 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
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