Study On The Preparation And Application Of Micro-nano Composited Electrode With Fractal-like Structure

At present,with the imminent exhaustion of traditional resources and serious enviro nmental pollution becoming increasingly prominent,the utilization of new energy is the most effective mean to solve the energy problem.The new energy devices,such as dyesensitized solar cell(DSSC)and nano-generator,have become a hotspot in recent years because of simple production and low-cost.As an inventive energy collector,triboelectric nanogenerators nano-generator(TENG)harvests energy through contact electrification of two opposite tribo-polarity materials,which can convert the mechanical motions of two triboelectric layers into electrical potential difference between electrodes,and drive the electrons to flow back and forth in the internal circuit.The efficiency of devices with the rigid flat structure of is high,but the poor space utilization and the inefficient structure of electrode hinder the diversity and development of industrialization.Recently,the introduction of a series of fibrous devices,such as DSSC,super capacitors and nanogenerators,they not only design new efficient structure to improve the efficiency of the device,but also extend the scope of application of electrode substrate.Fractal structure is fairly common in nature.Plants can utilize the root and leaf to acquire energy from nature.In this work,the fractal-like structure with high aspect ratio is designed from feature of the fractal structure.Then,the zinc oxide arrays and the metal layer were assembled on the surface of the electrode to prepare the micro-nano composite electrode with fractal-like structure.Based on mentioned-above,the study further explores the application of the electrode in TENG and DSSC.The main contents include the following:(1)A new micro-nano composite electrode with fractal-like structure was fabricated successfully in the paper.Firstly,Through optimizing the experimental parameters of chemical-position method and electrode-position method,the metal layers were deposited on the complex surfaces,such as polymer films,plant fibers and granular powders.Then,the ZnO nanorod arrays was grown on the substrate.Based on the ZnO nanorod arrays,metal manganese layer are successfully deposited to prepare a fractal-like micro-nano composite metal electrode.The results show that the mic ro-nano composite electrode with fractal-like structure have good flexibility and Breathability,which will have prospect to apply in flexible energy devices.(2)This paper investigates the application of the micro-nano composite electrode with fractal-like in TENG.Firstly,The polymer substrate was formed fractal-like structure by the method of laser etching,and then ZnO nanorod arrays were grown on the surface.Finally,fabricated the nanocrystalline can help the electrode applying to TENG.The results show that the output of TENG increases gradually with the increase of the fractal dimension,and decreases with the increase of the void-to-surface ratio.Through optimizing the working conditions,the outpower density of TENG is up to 28.6 mW/cm2.In addition,TENG has good permeability and light transmission,which can be integrated with photovoltaic cells to build hybrid power system.(3)This paper investigates the application of the micro-nano composite electrode with fractal-like in DSSC.ZnO nanorod arrays were fabricated on the polymer fiber substrate.Using a simple chemical-position method and electrode-position method to grow a kind of metal layer on the ZnO nanorod arrays.Then,a semiconductor oxide film was deposited on the micro-nano composite metal electrode,which can.apply to DSSC.Compared to the standard fiber DSSC,DSSC with the fractal-like electrode has a shorter carrier transmission distance.However,owing to the limitation of the metal chemicalposition process,there is a short circuit in the device,which gives rise to lower performance than the standard fiber DSSC under the same conditions.Therefore,in the following step,it is necessary to improve the chemical-position process and reduce the short circuit to play the advantages of the micro-nano composite metal electrode.