Preparation And Electrochemical Properties Of Porous Co?OH?₂ Nanosheets Array Film Decorated By Ag Nanocrystals

With the rapid development of society,environment and energy problem is increasingly rigorous.The deterioration of environmental problem?the depletion of fossil energy and the popularity of electric cars in the global level drives people attention towards new energy storage material.It also stimulates the research and development of the energy storage equipment.Owing to the high power and energy density,high specific capacity,rapid charge and discharge and environment friendly,Super-capacitor has higher expectations for its future development.Electrode as the core of Super-capacitor,electrode material and its electrochemical performance is the determinant for the comprehensive performance of capacitor.Thus,the development of new electrode materials with high performance hold great significance for the research and application of Super-capacitor energy storage equipment.This paper's main research achievements are as follows:?1?The preparation of porous Co?OH?₂ manometer array film material:the paper adopts hydro-thermal method and produces porous Co?OH?₂manometer array film material.Co?OH?₂ has higher theoretical capacity.Porous Co?OH?₂ manometer array film material can increase the contact area with the electrolyte,shorten the diffusion distance.At the same time,it can effectively alleviate the volume expansion effect in the process of charging and discharging.The actual electrochemical performance test verify our expectations.The preparation of porous Co?OH?₂ manometer array film material in electrochemical performance test shows good electrochemical performance.After the cycle of 1200 times,specific capacity is still as high as 714F·g-1 which is the 83.4%of the first cycle.It shows that porous Co?OH?₂ material has good cycle stability.?2?Porous Co?OH?₂ nanosheets array film decorated with Ag nanocrystals were facilely prepared by the hydrothermal deposition and subsequent chemical bath reduction.The samples were characterized by X ray diffraction and scanning electron microscope.Galvan static charge and discharge measurements reveal that the Co?OH?₂/Ag composites exhibit excellent cycling stability.After1200 cycles,the specific capacitance remains to be 869.2F·g-1?capacitance retention of 93.0%?,which is nearly 151F·g-1 higher than that of the Co?OH?₂ nanosheets array film withcapacitance retention of 82.8%.Our results show that the Co?OH?₂/Ag composites can be applied in the field of energy storage devices with promising prospect.