片状碳载金属纳米颗粒复合物的制备及其氧还原电活性  

Preparation and oxygen reduction electroactivity of metal nanoparticles loaded on sheet-like carbon composites

作　　者：章巧丽 王雅萍 孙万杰 易清风[1,2] ZHANG Qiao-Li;WANG Ya-Ping;SUN Wan-Jie;YI Qing-Feng(School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education,Xiangtan,Hunan 411201,China)

机构地区：[1]湖南科技大学化学化工学院,湘潭411201 [2]新能源储存与转换先进材料湖南省重点实验室,湘潭411201

出　　处：《无机化学学报》2023年第2期346-356,共11页Chinese Journal of Inorganic Chemistry

基　　金：financial support from the National Natural Science Foundation of China(Grant No.21875062);the Innovation Training Program for College Students in Hunan Province(Grant No.S202210534022)。

摘　　要：将双氰胺、蔗糖与酞菁铁(钴)的混合物通过简单热解法,制备出Co/C-N、Fe/C-N和Fe-Co/C-N纳米复合物。随后利用热还原法,将少量铂沉积于Co/C-N上得到片状碳负载的Co-Pt纳米颗粒Co-Pt/C-N。对样品进行了详细表征,并研究了其在全域pH范围内(酸性、中性与碱性溶液)中的氧还原反应(ORR)活性。结果表明,Co/C-N具有比Fe/C-N和Fe-Co/C-N更高的ORR起始电位和半波电位,并且在碱性和中性溶液中,Co/C-N表现出比Pt/C更强的ORR电活性;在酸性溶液中,铂负载量(质量分数)8.1%的Co-Pt/C-N表现出与Pt/C相近的ORR起始与半波电位。催化剂优异的电活性主要归因于片状碳形成的三维结构、金属纳米颗粒的均匀分布以及丰富的吡啶氮。Herein,Co/C-N,Fe/C-N,and Fe-Co/C-N nanocomposites were obtained by the self-template method,and high-temperature pyrolysis of the mixture composed of dicyandiamide,sucrose,and cobalt(ferric)phthalocyanine as nitrogen,carbon,and metal sources respectively.Then a small amount of platinum was deposited on the Co/C-N with better oxygen reduction reaction(ORR)electroactivity by thermal reduction to obtain carbon nanosheet-supported Co-Pt nanoparticles(Co-Pt/C-N).The catalysts were well characterized and tested for ORR.The Co/C-N catalyst displayed the onset potential(Eonset)and half-wave potential(E1/2)of ORR closed to the Pt/C in an alkaline solution,and it even presented the more positive onset potential and half-wave potential in a neutral solution.For Co-Pt/C-N,its ORR electroactivity in an acidic solution was greatly enhanced compared with the Co/C-N and was comparable to the Pt/C.The excellent ORR electroactivity of the samples is mainly attributed to the 3D structure formed by the carbon nanosheets,uniform distribution of the metal nanoparticles,and abundant pyridine N.

关 键 词：氧还原反应 酞菁钴 酞菁铁 燃料电池 

分 类 号：O646.51[理学—物理化学]