杂原子修饰多孔铁钴氮碳基氧还原催化剂的电化学性能分析  

Electrochemical Performance Analysis of Heteroatom Modified Porous Iron,Cobalt-Nitrogen-Carbon Based Electrocatalyst toward Oxygen Reduction Reaction

作　　者：陈英楠 崔劲松 刘恩红 柳傲雪 韩策 杨国程[1] CHEN Ying-Nan;CUI Jing-Song;LIU En-Hong;LIU Ao-Xue;HAN Ce;YANG Guo-Cheng(School of Chemistry and Life Science,Changchun University of Technology,Changchun 130012,China;Department of Chemistry and Applied Chemistry,Changji University,Changji 831100,China)

机构地区：[1]长春工业大学化学与生命科学学院,长春130012 [2]昌吉学院化学与应用化学系,昌吉831100

出　　处：《分析化学》2020年第11期1519-1525,共7页Chinese Journal of Analytical Chemistry

基　　金：吉林省教育厅科技计划项目(No.JJKH20200651KJ)资助。

摘　　要：受限于商用铂基催化剂稳定性差和生产成本高等缺点,燃料电池以及相关绿色能源的推广进展缓慢。因此,研发高效、廉价的替代型氧还原电催化剂,是电催化领域的研究热点。本研究以催化活性较好的铁钴氮碳基材料为基础,通过外加杂原子的方法,制备了一系列杂原子修饰多孔铁钴氮碳基氧还原催化剂。通过对所制备材料的组成和形貌进行表征,并结合其在碱性电解质中电催化氧还原的活性、稳定性和抗甲醇能力,探究了杂原子修饰与材料催化性能之间的潜在规律。所制备的FeCo/NFC催化剂,在碱性条件下半波电位为0.84 V,在0.5 V处电子转移数为3.85,HO-2中间产物产率为7.61%,表明此催化剂具有与商业铂碳相近的催化效果和近四电子的催化选择性。此外,FeCo/NFC催化剂还具有优良的催化稳定性和抗甲醇能力,作为商业铂碳的替代品,在燃料电池领域具有良好的应用潜力。The drawback of commercial Pt-based electrocatalysts,such as poor stability and high cost,is one of the major issues which limits the promotion of fuel cells and related green energy application.Therefore,developing the inexpensive alternative electrocatalysts for high-performance and stable oxygen reduction reaction(ORR)has become a research hotspot in the field of electrocatalysis.Herein,a series of heteroatom modified porous iron,cobalt-nitrogen-carbon based electrocatalysts were successfully fabricated by modifying the FeCo/NC by additional introduction of heteroatoms(B,P and F)in this work.The mechanism of ORR performance boosted by introduction of B,P and F was explored by combining well characterization of composition and morphology with rational electrochemical tests.The as-fabricated FeCo/NFC sample exhibited highly efficient ORR activity with the half-wave potential of 0.84 V,electron transfer number of 3.85 and HO-2 yield of 7.61%at 0.5 V,which was comparable to those of commercial Pt/C.Meanwhile,the FeCo/NFC also displayed outstanding stability and methanol tolerance in alkaline electrolyte which demonstrated excellent application potential in the field of fuel cells as an alternative electrocatalyst for commercial Pt/C.

关 键 词：杂原子修饰 过渡金属-氮-碳 氧还原反应 电催化剂 

分 类 号：O643.36[理学—物理化学] TM911.4[理学—化学]