三维Co2Mn3Ox纳米薄膜的制备及电化学储能特性

Preparation and Electrochemical Energy Storage Characteristics of 3D Co2Mn3Ox Nanofilms

摘要:

泡沫镍的良好导电性及多孔的三维骨架结构有助于电子传输和电解液接触。以泡沫镍为模板，采用水热合成法制备三维Co₂Mn₃O_x纳米薄膜，并对其作为超级电容器电极材料的电化学储能特性进行了实验研究。结果表明：在泡沫镍表面可控合成了超薄的三维Co₂Mn₃O_x纳米薄膜，该薄膜由超小的纳米颗粒组成，并具有一定的多孔结构；合成的三维Co₂Mn₃O_x纳米薄膜作为超级电容器电极材料表现出了优异的储能特性，如在电流密度为5 A?g^-1下具有1092.5 F?g^-1的比电容，恒流充放电循环1000次后电容保留率高达89.1%。此外，以Co₂Mn₃O_x纳米薄膜为正极材料，活性碳为负极材料，组装的非对称超级电容器表现出高的能量密度、高的功率密度以及良好的循环稳定性。该研究丰富了自支撑、无粘结剂、高储能特性的赝电容超级电容器电极材料种类，为电化学储能薄膜材料的设计提供了思路。

Abstract:

The good electrical conductivity and porous three-dimensional （3D） framework of Ni foam promote electron transport and electrolyte contact. 3D Co₂Mn₃O_x nanofilms were prepared by hydrothermal method with Ni foam as a template， and their electrochemical energy storage properties as electrode materials for supercapacitors were experimentally studied. The results show that ultrathin 3D Co₂Mn₃O_x nanofilms can be controllably synthesized on the surface of Ni foam， which is composed of ultrasmall nanoparticles and has a certain porous structure. The synthesized 3D Co₂Mn₃O_x nanofilms as a supercapacitor electrode exhibits excellent energy storage performances， such as a specific capacitance of 1092.5 F?g^-1 at a current density of 5 A?g^-1 and a capacitance retention of 89.1% after 1000 cycles of galvanostatic charge-discharge. In addition， using Co₂Mn₃O_x nanofilms as the cathode and activated carbon as the anode， the assembled asymmetric supercapacitor provides high energy density， high power density， and good cycle stability. This work enriches the electrode material species of pseudocapacitor supercapacitors with self-supporting， binder-free， and high energy storage characteristics， and provides ideas for the design of electrochemical energy storage films.