Highly-Dispersed and Highly-Functional Ni Electrode Catalyst Prepared by a New CVI Method for Application to Molten Salt Type Fuel Cell

我们被用来准备高分散性和高功能镍金属电极催化剂的高化学和热稳定性，它可以应用于熔化盐型钛细胞。一种新的化学蒸汽渗透（CVI）方法被证明是用tic来涂覆碳纤维表面以获得金属的支持材料。反应条件如温度、流时和蒸汽压力对TiC形成的影响已被系统地调查，通过加热碳纤维样品，在H_2/TiCl_4混合气体中稀释的红外图像家具。十种碳纤维，从沥青、PAN和射线等获得，在不同温度下进行热处理，作为样品使用。TiC形成由XRD、重量分析、化学分析和SEM方法评估。在所有样本上，在1000 ° C左右发现了一种反应，这可能取决于原始材料的准备，即：特别是他们的热治疗温度。反应的时间过程，它对部分压力和反应温度以及产品（Tic_）的非均匀成分的依赖性<0.8>，是对活性碳纤维的一个例子，TiC的一个有趣的技术，如：a felt-like porous结构由ca的精细TiC纤维组成。0.1微型，被发现了。本产品已作为Pt和Ni的补充进行了测试。7%Pt/TiC//C准备好了H_2PtCl_6显示出了高差异0.6，并且在H_2中稳定到500 ° C。However， TiC在O_2中氧化化为400 ° C，使Pt粒子的几个接头结合在一起。0.04的差异程度被认为是5%Ni/TiC//C，由于[Ni（CN）_4]^&lt;-2&gt;复合离子的影响，其稳定性高达500 ° C。这是一个承诺的价值，因为镍通常是很难被完全分散在传统的支持上。O（O）

We aimed to prepare highly-dispersed and highly-functional Ni metal electrode catalyst of high chemical and thermal stability, which could be applied to molten salt type tuel cell.A new chemical vapor infiltration (CVI) method was explored to coat the surface of garbon fibers by tic for obtaining supporting materials of metals. The effect of reaction conditions such as temperature, time on stream and vapor pressure on TiC formation was systematically investigated by heating a carbon fiber samplein a infra-red image furnace under a H_2/TiCl_4 mixed gas diluted with Ar. Ten kinds of carbon fibers, obtained from pitch, PAN and rayon etc. by thermal treatment at different temperatures, were used as samples. TiC formation was evaluated by XRD, weight analysis, chemical analysis and SEM methods. Over all samples, the reaction was found to start over around 1000 ゜C, though the conditions depended much on the preparation of raw materials, i.e., especially their thermal treatment temperature. The time course of reaction, its dependency on partial pressures and reaction temperature and the nonstoichimetric composition of products (TiC_<0.8>) were examined intensively.On a sample of active carbon fiber, an interesting texture of TiC,i.e., a felt-like porous structure consisting of fine TiC fibrils of ca. 0.1 micron, was obtained. This product was tested as a suppour for Pt and Ni. 7% Pt/TiC//C prepared by an impregnation of H_2PtCl_6 showed a high dispersion of 0.6, and it was stable up to 500゜C in H_2. However, TiC was oxidized at 400゜C in O_2, accompanying severe sintering of Pt particles. The degree of dispersion of 0.04 was attained on 5% Ni/TiC//C prepared by an impregnation of [Ni(CN)_4]^<-2> complex ion, with its stability up to 500゜C in h_2. This is a promising value, considering that Ni is usually difficult to be finely dispersed on conventional supports. O