Liang Wenyu, Yang Wenjuan, Sakib Sadman, Zhitomirsky Igor
Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S4L7, Canada.
Molecules. 2022 Aug 20;27(16):5313. doi: 10.3390/molecules27165313.
This investigation is motivated by increasing interest in the development of magnetically ordered pseudocapacitors (MOPC), which exhibit interesting magnetocapacitive effects. Here, advanced pseudocapacitive properties of magnetic CuFeO nanoparticles in negative potential range are reported, suggesting that CuFeO is a promising MOPC and advanced negative electrode material for supercapacitors. A high capacitance of 2.76 F cm is achieved at a low electrode resistance in a relatively large potential window of 0.8 V. The cyclic voltammograms and galvanostatic charge-discharge data show nearly ideal pseudocapacitive behavior. Good electrochemical performance is achieved at a high active mass loading due to the use of chelating molecules of ammonium salt of purpuric acid (ASPA) as a co-dispersant for CuFeO nanoparticles and conductive multiwalled carbon nanotube (MCNT) additives. The adsorption of ASPA on different materials is linked to structural features of ASPA, which allows for different interaction and adsorption mechanisms. The combination of advanced magnetic and pseudocapacitive properties in a negative potential range in a single MOPC material provides a platform for various effects related to the influence of pseudocapacitive/magnetic properties on magnetic/pseudocapacitive behavior.
对磁有序赝电容器（MOPC）发展的兴趣日益浓厚，推动了本研究，这种磁有序赝电容器展现出有趣的磁电容效应。在此，报道了磁性CuFeO纳米颗粒在负电位范围内的先进赝电容特性，表明CuFeO是一种有前景的MOPC以及超级电容器的先进负极材料。在0.8 V的相对较大电位窗口中，以低电极电阻实现了2.76 F/cm的高电容。循环伏安图和恒电流充放电数据显示出近乎理想的赝电容行为。由于使用紫尿酸铵盐（ASPA）螯合分子作为CuFeO纳米颗粒的共分散剂和导电多壁碳纳米管（MCNT）添加剂，在高活性物质负载量下实现了良好的电化学性能。ASPA在不同材料上的吸附与ASPA的结构特征有关，这使得存在不同的相互作用和吸附机制。单一MOPC材料在负电位范围内先进的磁性和赝电容特性的结合，为与赝电容/磁性特性对磁性/赝电容行为的影响相关的各种效应提供了一个平台。
