多壁碳纳米管负载对苯二酸用作氧还原催化剂性能

The ORR Performances of MWCNT-Supported Terephthalic Acid Catalyst

中文关键词:  氧还原  电催化  多壁碳纳米管  对苯二酸

英文关键词:oxygen reduction reaction  electrocatalysis  multi-walled carbon nanotubes  terephthalic acid

中文摘要:

      创新性地设计了多壁碳纳米管负载对苯二酸的新型氧还原反应(ORR)催化剂, 旨在寻求替代贵金属铂基催化剂的可持续解决方案. 该催化剂的制备过程经过精细调控, 通过控制多壁碳纳米管(CNTs)与对苯二酸(PTA)的负载比例, 优化催化活性中心的分散和电子传递效率. 为准确评估该催化剂的综合电化学性能, 采用旋转圆盘电极测试系统, 评估其在不同电位下的电流密度、过电位等关键指标. 实验结果表明, PTA与CNTs的最佳比例为10∶5, 该比例下的催化剂展现出卓越的ORR性能; 当CNTs比例过高时会掩蔽反应活性位点; 而CNTs比例过低时, 则可能影响电子传递效率. 在最优比例下, 催化剂的极限电流密度高达-7.57 mA·cm^-2, 显著优于商业Pt/C催化剂(-4.67 mA·cm^-2), 表现出优异的催化活性. 此外, 为考察催化剂的实际应用潜力, 还深入评估了其在燃料交叉反应(甲醇)中的稳定性. 与商用Pt/C催化剂相比, 该催化剂表现出卓越的稳定性, 电流波动较小, 证明其对燃料交叉反应具有更强的抗干扰能力. 这项研究为设计高效、稳定的ORR催化剂提供了一种新方法和新思路.

英文摘要:

      A high-performance oxygen reduction reaction (ORR) catalyst was developed by using multi-walled carbon nanotubes (MWCNTs) as a support for terephthalic acid (PTA), offering a sustainable alternative to platinum-based catalysts. The catalyst synthesis was optimized by tuning the MWCNT-to-PTA ratio to enhance active site dispersion and electron transport efficiency. Rotating disk electrode (RDE) tests revealed that a PTA∶CNTs ratio of 10∶5 delivers optimal ORR performance, achieving a remarkable limiting current density of -7.57 mA·cm^-2, surpassing that of commercial Pt/C (-4.67 mA·cm^-2). Excessive MWCNTs could obscure active sites, while insufficient MWCNTs might impair charge transfer. Additionally, the catalyst exhibits superior methanol tolerance and stability compared to Pt/C, showing minimal current fluctuations during fuel crossover tests. This work presents a promising strategy for designing efficient, durable, and cost-effective ORR catalysts, advancing the development of sustainable fuel cell technologies.