CAJ | 학술논문

采用脉冲微波辅助化学还原法制备了质子交换膜燃料电池(PEMFC)用Pt/C催化剂.通过X射线衍射(XRD)和高分辨透射电镜(HRTEM)等分析技术对催化剂的微观结构和形貌进行了表征.利用循环伏安(CV)法计算了催化剂的电化学比表面积.在此基础上制备了膜电极(MEA)并组装成单电池,考察了制备的Pt/C催化剂作为单电池阴极催化剂材料的电催化性能.微波功率和微波作用时间对Pt颗粒直径和分散有重要影响.XRD和HRTEM结果表明,在微波功率为2kW微波作用12 s,豫驰180s,且重复6次的条件下,制得的催化剂中铂纳米粒子颗粒直径小,分散均一,其平均粒径为1.9nm.CV结果表明,该条件下制得的催化剂电化学比表面积达到72.3m2/g,且该催化剂对应的单电池最高功率密度为0.572W/cm2.
채용맥충미파보조화학환원법제비료질자교환막연료전지(PEMFC)용Pt/C최화제.통과X사선연사(XRD)화고분변투사전경(HRTEM)등분석기술대최화제적미관결구화형모진행료표정.이용순배복안(CV)법계산료최화제적전화학비표면적.재차기출상제비료막전겁(MEA)병조장성단전지,고찰료제비적Pt/C최화제작위단전지음겁최화제재료적전최화성능.미파공솔화미파작용시간대Pt과립직경화분산유중요영향.XRD화HRTEM결과표명,재미파공솔위2kW미파작용12 s,예치180s,차중복6차적조건하,제득적최화제중박납미입자과립직경소,분산균일,기평균립경위1.9nm.CV결과표명,해조건하제득적최화제전화학비표면적체도72.3m2/g,차해최화제대응적단전지최고공솔밀도위0.572W/cm2.
Pt/C catalysts for polymer electrolyte membrane fuel cells were synthesized by pulse-microwave assisted chemical reduction.X-ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM) were used to investigate the microstructure and morphology of the as-prepared catalysts. The electrochemical surface area (ESA) was studied by cyclic voltammetry (CV). Membrane electrode assemblies were fabricated and the as-prepared catalysts were evaluated. The particle size and distribution of Pt nanoparticles on the carbon support greatly depended on the microwave power and irradiation time. XRD and HRTEM showed that the Pt/C catalysts possessed the smallest mean Pt particle size (1.9 nm) and the most uniform distribution among all the synthesized catalysts when the microwave was on for 12 s and off for 180 s, and this was repeated 6 times at a microwave power of 2 kW. A CV revealed that the ESA of the catalyst was 72.3m2/g and the corresponding maximum power density was 0.572 W/cm2.