Co-N共掺杂碳纳米管-多孔碳构筑及其氧还原电催化性能

Synthesis and ORR Properties of Co-N Co-Doped Carbon Nanotubes-Porous Carbons

采用一步化学气相沉积法,以乙腈蒸气为氮源,以钴离子交换合成的沸石(CoY)为模板,制备了Co-N共掺杂碳纳米管-多孔碳氧还原催化剂(Co-N/CNT-C)。利用SEM、TEM、XRD、BET和电化学测试对催化剂组成、结构和电催化性能进行了表征。结果表明:Co-N/CNT-C-600在碱性电解质中的半波电位和极限电流密度与商业Pt/C催化剂相近,达到0.80 V和4.31 mA·cm^(-2),且循环稳定性和耐久性优于Pt/C催化剂。优异的催化性能归因于以下两点:Co-N/CNT-C-600中大量碳纳米管作为纳米级电子导体,有效加速了反应过程中的电子传递速率;被锚定在碳纳米管和多孔碳内部的催化活性位点,有效防止了连续电极反应过程中金属离子的迁移和团聚。

The ORR catalysts of Co-N co-doped carbon nanotube-porous carbon(Co-N/CNT-C)were synthesized by one-step acetonitrile vapor CVD,using acetonitrile vapor as the nitrogen source and Co ion-exchanged zeolite(CoY)as the template.The composition,structure and electrocatalytic performance of Co-N/CNT-C were characterized using SEM,TEM,XRD,BET,and electrochemical tests.The results showed that Co-N/CNT-C-600 exhibited a half-wave potential and a limiting current density in alkaline electrolyte similar to commercial Pt/C catalysts,reaching 0.80 V and 4.31 mA·cm^(-2),respectively.Moreover,it had superior cycling stability and durability compared to Pt/C catalysts.The excellent catalytic performance was attributed to two main factors:the abundant CNTs in Co-N/CNT-C-600 act as nanowires,effectively accelerating electron transfer rates during the reaction process;the catalytic active sites anchored within the CNTs and porous carbon effectively prevented the migration and aggregation of metallic species during the electrode reactions.