摘要
为了提高质子交换膜燃料电池催化剂中贵金属的利用率,以碳纳米管(CNTs)负载Pt为催化剂,设计制备了具有催化剂梯度分布结构的Pt/buckypaper催化层。利用扫描电子显微镜等多种表征手段,观察与分析了催化剂和催化层的结构及Pt含量分布,并考察了它们的电化学性能。结果表明,Pt/CNTs催化剂中Pt颗粒在超声混酸氧化处理过的CNTs表面上分布均匀,平均直径为2.4nm。其电化学活性表面积(ECSA)接近于商用Pt/C催化剂的值,比质量活性(MA)则远高于商用催化剂,且具备更为优异的电化学循环稳定性。利用这种催化剂制备的Pt/buckypaper催化层保持着较大的ECSA,表明其中的Pt颗粒具有较高的利用率,体现了这种新颖结构的独特优势。
In order to increase the utilization of the precious metal catalysts in proton exchange membrane fuel cells,a new type of Pt/buckypaper catalytic layer with gradient structure was designed and prepared.Carbon nanotubes（CNTs）pretreated using ultrasonic method in mixed acid were used as the support of Pt catalyst.The Pt/buckypaper catalytic layer with Pt/CNTs gradient distribution was fabricated by simple filtration method.Several techniques such as scanning electron microscope,energy-dispersive X-ray spectroscope were utilized to characterize the microstructure and morphology of the catalyst and catalytic layer as well as the Pt distribution.The electrocatalytic performance of the catalyst and catalytic layer were measured by cyclic voltammetry and linear sweep voltammetry methods.The results show that the Pt particles were well dispersed on the CNTs support and the Pt particle size of Pt/CNTs was about 2.4 nm.The electrochemical specific area（ECSA）of Pt/CNTs is similar to that of commercial Pt/C catalyst,while its specific mass activity and electrochemical stability were much higher than those of Pt/C.The ECSA of Pt/buckypaper catalytic layer can basically maintain the value of Pt/CNTs,indicating a high utilization of Pt.The novel gradient structure of catalytic layer manifests its promising applications in fuel cells.
作者
朱诗尧
李平
叶黎城
郑俊生
高源
ZHU Shi-yao;LI Ping;YE Li-cheng;ZHENG Jun-sheng;GAO Yuan(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;Clean Energy Automotive Engineering Center,Tongii University,Shanghai 201804,China;College of Automotive Studies,Tongii University,Shanghai 201804,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2018年第6期27-35,共9页
Journal of Materials Engineering
基金
国家自然科学基金项目(21276077)
中央高校基本科研业务费专项资金项目(WG1213011)
中国石油科技创新基金项目(2016D-5007-0501)
科技部科技支撑项目(2015BAG06B00)
关键词
质子交换膜燃料电池
铂催化剂
碳纳米管
巴基纸
梯度结构
制备
proton exchange membrane fuel cell
Pt catalyst
carbon nanotube
buckypaper
gradient structure
preparation
