Comparison of hydrogen adsorption abilities of platinum-loaded carbon fibers prepared using two different methods
Comparison of hydrogen adsorption abilities of platinum-loaded carbon fibers prepared using two different methods
复制标题
两种不同方法制备的载铂碳纤维的氢吸附能力比较
DOI：
10.1016/s0008-6223(00)00033-6
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Á. Linares
中科院分区：
文献类型：
--
作者：
J. Ozaki;W. Ohizumi;A. Ōya;M. Illán;M. Román;Á. Linares
负载铂的碳，Pt/C已被用作与蒸汽或二氧化碳的离子，用于暴露氢化催化剂[1]，并且被称为典型的金属颗粒到碳基质系统的外表面，显示出氢溢出现象[2，3]。[10，11]。另一方面，PB方法获得了最近，在具有沉积有金属的孔的碳碳材料的狭缝型孔中的氢储存已经吸引了来自各个领域的研究人员，因为通过碳化聚合物引入的颗粒是氢作为车辆燃料的重要性[4-6]。由热分解聚合物组成的共混物是几种类型的存储，例如压缩、吸附-包括金属前体和给出的聚合物、金属吸附和物理吸附。Chen等人展示了碳。在本研究中，我们制备了载铂碳一种新型的储氢机制，即纤维使用上述两种方法，和解离吸附[7]。氢溢出到铂的分散体和氢吸附碳基质上应有助于这种吸附。为此，对碳纤维的特性进行了比较。目的探索合适的制备方法PB样品的制备过程与载铂碳纤维相同。如下预定量的乙酰乙酸铂-将金属物质负载到用于制备含有0.2表面ACF的碳纤维的酸（PtAA）上的常规方法是通过初湿含浸法。缺点或2重量% Pt，和聚乙烯醇缩丁醛（PVB，和子的这种方法涉及到化学的不完全利用，mw 300，丁缩醛化度73%），被溶解在甲醇中的渗透不足造成的气泡空间;然后溶剂被消除前体溶液进入微孔，并使用旋转蒸发器沉积得到混合物。适当的金属颗粒封闭微孔[8]。对于过量的酚醛清漆型酚醛树脂（PF），我们提出了混合（MX）Gun ei Chemical）和混合物（PF：PVB 51：1的方法和聚合物共混物（PB）的方法用于装载重量），将金属颗粒一起放入在150- 160 ℃下加热的烧瓶中[9]。这些方法的简要描述是在氮气流下形成聚合物共混物。下面的MX。混合方法包括使用以下程序制备金属样品的混合。前体转化为聚合物以制备均匀的混合物。将Dur-PtAA和PF溶解在甲醇中，同时搅拌碳化混合物，使用旋转存款除去金属颗粒，然后在碳基体的主体中除去溶剂。一般来说，活动蒸发器。PB和MX前体使用连续方法纺丝并固化。详情见其他地方[9]。纤维前体在900 ℃下保温30 h。联系电话：181-277-30-1352;传真：181-21分钟，在氮气流中，使用58 ℃最小值的加热速率。此后，通过Pt来鉴别所述样品
Platinum-loaded carbon, Pt/C has been used as a tion with steam or carbon dioxide is employed to expose hydrogenation catalyst [1] and is known as a typical the metal particles to the outer surface of the carbon matrix system showing the hydrogen spillover phenomenon [2, 3].[10, 11]. On the other hand, the PB method obtains a Recently, hydrogen storage in the slit-type pores of carbon carbon material that has pores deposited with metal has attracted researchers from various fields because of the particles, which were introduced by carbonizing a polymer importance of hydrogen as a fuel for vehicles [4–6]. There blend composed of a thermally decomposing polymer are several types of storage such as compression, liquefac- including the metal precursor and a polymer that gives tion, metal hydrides and physisorption. Chen et al. showed carbon. In this study we prepared platinum-loaded carbon a new type of mechanism for hydrogen storage, ie fibers using the two methods mentioned above, and the dissociative adsorption [7]. Spillover of hydrogen onto the dispersion of platinum and the hydrogen adsorption carbon substrate should help such adsorption. For this characteristics of the carbon fibers are compared. purpose we need to explore suitable preparation methods The preparation procedure for the PB samples is as for platinum-loaded carbon fibers. follows. Predetermined amounts of platinum acetylaceto-A conventional way to load metal species onto the nate (PtAA), used to prepare carbon fibers containing 0.2 surface of ACF is by incipient wetness. The shortcomings or 2 wt.% Pt, and poly (vinyl butyral)(PVB, Wako of this method relate to the incomplete utilization of Chemical, mw 300, degree of butyralization 73%), were micropore space caused by insufficient penetration of the dissolved in methanol; then the solvent was eliminated precursor solution into the micropores, and deposition of using a rotary evaporator to obtain a mixture. Appropriate metal particles which close the micropores [8]. To over- amounts of novolac-type phenol-formaldehyde resin (PF, come such problems we proposed the mixing (MX) Gun ei Chemical) and the mixture (PF: PVB51: 1 by method and polymer blend (PB) method for the loading of weight), were put together in a flask heated at 150–1608C metal particles [9]. A brief description of these methods is under a nitrogen flow, to form a polymer blend. The MX given below. The mixing method includes mixing of metal samples were prepared using the following procedure. precursors into polymers to make uniform mixtures. Dur- PtAA and PF were dissolved in methanol while stirring ing carbonization of the mixture, the metal particles and then the solvent was removed using a rotary deposit in the body of the carbon matrix. Usually, activa- evaporator. The PB and MX precursors were spun using a continuous method and cured. The details are described elsewhere [9]. The fibrous precursors was carbonized at 9008C for 30* Corresponding author. Tel.: 181-277-30-1352; fax: 181-21 min in a nitrogen stream using a heating rate of 58C min. 277-30-1353. Hereafter the carbonized samples are discriminated by Pt