碳纳米管/碳纳米带氧还原催化剂的长度效应  

Length Effects of Carbon Nanotube/Carbon Nanobelt Oxygen Reduction Catalyst

作　　者：薛龙飞 张轩 万鑫 段辉平[2] 刘晓芳[2] 水江澜 XUE Longfei;ZHANG Xuan;WAN Xin;DUAN Huiping;LIU Xiaofang;SHUI Jianglan(Tianmushan Laboratory,Hangzhou 311115,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]天目山实验室,浙江杭州311115 [2]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《防化研究》2024年第4期57-66,共10页CBRN DEFENSE

基　　金：自然科学基金委国家杰出青年基金(22225903)。

摘　　要：高活性、稳定、廉价的氧还原反应催化剂是燃料电池研究热点之一。本文研究了长度对全打开和半打开碳纳米管氧还原催化剂的影响。以不同长度的多壁碳纳米管为前驱体,制备了不同长度、不同掺氮量的一系列碳纳米管/碳纳米带复合催化剂。表征和测试发现,碳纳米管前驱体长度越长,碳纳米带掺杂氮元素含量越高,催化剂本征活性和起始电位越高;碳纳米管越短,催化剂表面越粗糙,催化层传质性能越好,起始电位与半波电位之间的差值越小,由此可知碳纳米带催化剂的长度存在最优值。此外,得益于非金属活性点,碳纳米带催化剂在酸性和碱性电解液中均表现出对甲醇和CO中毒良好的耐受性。Highly active,stable and cost-effective catalysts for oxygen reduction reactions stand as one of the research hotspots in fuel cells.This article explored the influence of length on fully open and semi-open carbon nanotube oxygen reduction catalysts.Utilizing multi-walled carbon nanotubes of varying lengths as precursors,a range of carbon nanotube/carbon nanobelt composite catalysts differing in length and nitrogen doping levels were prepared.Characterization and testing revealed that longer carbon nanotube precursors resulted in higher nitrogen doping levels in the carbon nanobelts,leading to enhanced intrinsic activity and initial potential of the catalyst.Conversely,shorter carbon nanotubes yielded a rougher catalyst surface,improved mass transfer performance within the catalytic layer,and a reduced difference between the initial potential and half-wave potential.This suggested that there existed an optimal length for carbon nanobelt catalysts.Furthermore,owing to the presence of non-metallic active sites,carbon nanobelt catalysts demonstrated excellent resistance to methanol and CO poisoning in both acidic and alkaline electrolytes.

关 键 词：燃料电池 非金属催化剂 打开碳纳米管 长度效应 氧还原催化剂 

分 类 号：TM911.4[电气工程—电力电子与电力传动]