PEMFC用Pt纳米线阴极催化剂的制备及在电堆中的应用

发布时间：2018-06-29 01:29

本文选题：燃料电池 + 碳载铂纳米线　；参考：《化工学报》2014年10期

【摘要】：采用无模板法制备了用于质子交换膜燃料电池(PEMFC)的碳载铂纳米线(Pt NWs/C)阴极催化剂,使用透射电镜(TEM)和X射线衍射图谱技术(XRD)对催化剂的微观结构和形貌进行了表征。研究结果表明,制备的铂催化剂具有纳米线的结构,平均截面直径为(4.0±0.2)nm,线长为15~25 nm。利用循环伏安(CV)法和线性伏安扫描法(LSV)表征催化剂的电化学活性和氧还原反应(ORR)特性,结果表明制备的Pt NWs/C催化剂电化学特性良好。利用Pt NWs/C和Pt/C作为阴极催化剂制备膜电极(MEA),并进行测试,最大功率密度分别为705.6 mW·cm-2和674.4 mW·cm-2。然后以Pt NWs/C和Pt/C为阴极催化剂组装了18片和20片的电堆,并进行性能测试,电堆的最大功率密度分别为409.2 mW·cm-2和702.7 mW·cm-2,单电池电压差异系数(Cv)分别为16.1%和4.36%,这表明Pt NWs/C作为阴极催化剂在放大后的膜电极组件(MEA)里表现出较好的催化活性,但与商业催化剂相比其性能与均一性还有待提高。该研究可为Pt NWs/C催化剂放大制备提供依据,同时可为后续的基于Pt NWs/C的电堆的耐久性测试和车载应用奠定基础。
[Abstract]:Carbon supported platinum nanowires (Pt NWs / C) cathode catalysts for proton exchange membrane fuel cells (PEMFC) were prepared by template free method. The microstructure and morphology of the catalysts were characterized by transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD). The results show that the prepared platinum catalyst has nanowire structure with an average cross-section diameter of (4.0 卤0.2) nm and a wire length of 15 ~ 25 nm. Cyclic voltammetry (CV) and linear voltammetry (LSV) were used to characterize the electrochemical activity and oxygen reduction reaction (ORR) of the catalyst. The membrane electrode (MEA) was prepared using Pt NWs / C and PT / C as cathodic catalysts. The maximum power densities were 705.6 MW cm-2 and 674.4 MW cm-2, respectively. Then using Pt NWs / C and PT / C as cathode catalysts, we assembled 18 and 20 electric stacks and tested their performance. The maximum power density of the stack is 409.2 MW cm-2 and 702.7 MW cm-2, and the voltage difference coefficient (CV) of the single cell is 16.1% and 4.36%, respectively. This indicates that Pt NWs / C acts as a cathode catalyst with good catalytic activity in the amplified membrane electrode assembly (MEA). But its performance and uniformity still need to be improved compared with commercial catalyst. This study can provide the basis for the preparation of Pt NWs / C catalyst, and it can also lay a foundation for the durability test and vehicle application of Pt NWs / C based stack.
【作者单位】：华东理工大学资源与环境学院;同济大学新能源汽车工程中心;上海舜华新能源系统有限公司;
【分类号】：TM911.48

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