MnO₂ and Mn₃O₄ particles were prepared by wet chemical methods and efficiently dispersed and mixed with multiwalled carbon nanotubes (MWCNT) for the fabrication of composite MnO₂-MWCNT and Mn₃O₄-MWCNT electrodes for electrochemical supercapacitors (ES). The problem of particle agglomeration was addressed by particle extraction through a liquid-liquid interface (PELLI) using octanohydroxamic acid (OHA) as a new extractor. OHA exhibited remarkable adsorption on particles due to a bidentate bonding mechanism. The use of OHA broadened the application of PELLI technology, because it allowed good extraction of particles from an aqueous phase at high pH. Moreover, OHA allowed efficient extraction by strong adsorption on particles not only at the liquid-liquid interface, but also in the bulk of an aqueous phase. Building on the advantages offered by the PELLI method and OHA as an extractor we found that Mn₃O₄-MWCNT electrodes exhibited a remarkably high capacitance of 4.2F cm⁻². Another major finding was that capacitance of Mn₃O₄-MWCNT electrodes was higher than that of MnO₂-MWCNT electrodes at active mass of 33 mg cm⁻². This finding showed processing advantages of PELLI and paved the way for applications of novel colloidal and surface modification strategies for the development of advanced ES. A conceptually new approach has been proposed based on the use of hydroxamic acids as capping agents for synthesis and extractor molecules for PELLI.

通过湿化学方法制备了MnO ₂和Mn ₃ O ₄颗粒，并将其与多壁碳纳米管（MWCNT）有效分散并混合，从而制造出MnO ₂ -MWCNT和Mn ₃ O ₄复合材料。-MWCNT用于电化学超级电容器（ES）的电极。通过使用辛酸异羟肟酸（OHA）作为新的萃取器，通过液-液界面（PELLI）进行颗粒萃取，解决了颗粒团聚的问题。由于双齿键合机理，OHA在颗粒上表现出显着的吸附作用。OHA的使用拓宽了PELLI技术的应用范围，因为它允许在高pH下从水相中良好地提取颗粒。此外，OHA不仅在液-液界面处而且在大部分水相中都通过对颗粒的强吸附而实现了有效的萃取。利用PELLI方法和OHA作为提取器所提供的优势，我们发现Mn ₃ O ₄ -MWCNT电极表现出4.2F cm的极高电容⁻²。另一个主要发现是，当活性质量为33 mg cm ^-2时，Mn ₃ O ₄ -MWCNT电极的电容高于MnO ₂ -MWCNT电极的电容。这一发现显示了PELLI的加工优势，并为新型胶体和表面修饰策略在高级ES研发中的应用铺平了道路。基于使用异羟肟酸作为封端剂用于合成和PELLI的提取分子，已经提出了概念上新的方法。