SBIR Phase I: Commercially Viable Deposition of Catalytic Films Onto Proton Conducting Membranes

*摘要9661724霍尼斯这个小型企业创新研究第一阶段项目将进一步开发一种通过开放式大气燃烧化学气相沉积(CCVD)技术在质子传导膜上涂覆催化剂的技术。低温、高效的H2/02和H2/Air燃料电池是使用各种商业上可获得的聚合物质子传导膜构建的，这些膜上涂有催化剂以激活阳极/阴极电离反应。目前，铂催化薄膜是通过厚膜技术或浸渍镀膜技术沉积的，导致材料成本高和/或产生机械易碎且结合强度低的涂层。作为这项提议和杜邦公司的初步概念验证，微涂层技术公司(MCT)在开放大气中在Nafion上沉积了一层附着的铂薄膜。采用开放式大气化学气相沉积技术制备的铂薄膜具有与真空化学气相沉积工艺相同或更好的性能。可以沉积出半径为10A~100A的理想的粘附性纳米颗粒。X射线衍射和扫描电子显微镜分析表明，所制备的薄膜为非晶态，与衬底的结合力良好。聚合物箔只需移动通过无室沉积区，就可以快速涂覆大片或卷材。由于CCVD技术使用基于溶液的前体，蒸汽压在选择前体时不起关键作用，因此前体通常比传统CVD所需的便宜30%至95%。在第一阶段，将评估铂与膜的结合强度及其随着沉积的变化而变化的微观结构。降低质子传导膜的制造成本是推动运输和固定用质子交换膜燃料电池商业化的关键因素。除了燃料电池的应用，根据这项研究开发的膜涂层技术的市场包括化学生产和流体处理。***

*** ABSTRACT 9661724 Hornis This Small Business Innovation Research Phase I project will further develop a technique to coat proton conduction membranes with catalysts via an open atmosphere Combustion Chemical Vapor Deposition (CCVD) technology. Low temperature, high efficiency H2/02 and H2/Air based fuel cells are constructed using a variety of commercially available polymeric proton conduction membranes that are coated with a catalyst to activate the anodic/cathodic ionization reactions. Currently, platinum catalytic films are deposited by thick film technology or dip-coating resulting in high material expenses and/or yielding a mechanically fragile coating with low bonding strength. As an initial proof-of-concept for this proposal and for DuPont, MicroCoatings Technologies (MCT) deposited an adherent platinum thin film onto NAFION( in the open atmosphere. Platinum thin films deposited by the open atmosphere CCVD technology generally show properties similar or superior to those obtained by vacuum based CVD processes. Desirable adherent nanophase grains with radii of 10A to 100A can be deposited. XRD and SEM analysis indicated that the resulting film was amorphous with good adhesion to the substrate. The polymer foil is simply moved through the chamberless deposition zone, which allows large sheets or roll stock to be coated quickly. Since the CCVD technique uses solution based precursors, vapor pressures do not play a crucial role in selecting the precursor, and thus precursors generally are 30% to 95% less expensive than those needed for traditional CVD. During Phase I, platinum is going to be evaluated for adhesion strength with the membrane and their microstructure with deposition variation. Lowering the manufacturing cost of proton conducting membranes is a critical factor in furthering the commercialization of proton exchange membrane (PEM) fuel cells for transportation and stationary applications. In addition to fuel cell applications, the market for the membrane coating tech nique developed under this research includes chemical production and fluid processing. ***