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。
Carbon supported platinum nanowires （Pt NWs/C）, acting as cathode catalyst for proton exchange membrane fuel cell （PEMFC）, were synthesized by reducing H2PtCl6 with HCOOH at room temperature without assistance of template. The catalyst microstructure and morphology were characterized by transmission electron microscopy （TEM） and X-ray diffraction （XRD）. The Pt NWs/C had an average cross-sectional diameter of （4.0±0.2） nm and a length of 15-25 nm. Good electrocatalytic performance and oxygen reduction reaction （ORR） of the as-prepared catalyst was characterized by cyclic voltammetry （CV） and linear sweep voltammetry （LSV）. Two membrane electrode assemblies （MEAs） were fabricated, with Pt NWs/C and Pt/C as cathode catalyst respectively, and tested for comparison. The maximum power densities of Pt NWs/C and Pt/C, respectively were 705.6 mW·cm^-2 and 674.4 mW·cm^-2. Afterwards, an 18-cell stack with Pt NWs/C as cathode catalyst and a 20-cell stack with Pt/C as cathode catalyst were built for testing. Maximum power densities were 409.2 mW·cm^-2 and 702.7 mW·cm^-2, and coefficients of variation （Cv） of individual cell were 16.1% and 4.36% at the maximum power density, respectively. Data analysis indicated that Pt NWs/C for the cathode in a MEA exhibited good catalytic activity at a scale-up level, however, as compared with the commercial Pt/C catalyst, CV performance and uniformity should be improved. This work not only sheds light on the scale-up possibility of Pt NWs/C catalyst, but also provides a possibility for further durability test before its application in a fuel cell vehicle.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2014年第10期3891-3898,共8页
CIESC Journal
基金
国家高技术研究发展计划项目(2012AA110501)
科技支撑项目(2013BAG15B00)
汉高基金教席~~
关键词
燃料电池
碳载铂纳米线
催化剂
电化学
fuel cells
carbon-supported Pt nanowires
catalyst
electrochemistry
