Preparation And Application Of Sisal Cellulose-based Triboelectric Nanogenerators

The plant fiber reinforced composite material prepared from sisal fiber has excellent electromagnetic,thermal and acoustic properties.Triboelectric Nanogenerators(TENG)based on the coupling of triboelectricity and electrostatic induction can convert mechanical energy in the environment into electrical energy,and are favored because of their unique advantages such as low cost,simple design and environmental friendliness.However,there are few reports about the production of TENG with sisal fiber as raw material.In this Paper,Sisal Cellulose Paper(SCP)was prepared by using sisal fiber as raw material,Cellulose was extracted from Sisal fiber by hydrothermal method,Sisal Cellulose Paper was assembled into Sisal Cellulose Paper based TENG(SCP-TENG).When the thickness of SCP is 140μm,the SCP-TENG has the best open-circuit current,short-circuit voltage and charge quantity,which are 6.1μA,118 V and 53 n C,respectively.The maximum power density of SCP-Teng is 256.9 m W/m~2.Chemical modification of SCP by nitrification,acetylation,chlorination,bromination,methylation and ethylation,the short circuit current,open circuit voltage and charge transfer of SCP-TENG after nitrification(substitution degree 20%)were 20.7μA,198V and 103 n C,and the power density of SCP-TENG was 827.0 m W/m~2.The effect of chemical groups on the electrical properties of SCP-TENG was discussed from the point of view of dipole moment.Compared with PTFE and PET,SCP has a higher dielectric constant.In addition,SCP-TENG was also used as a chemical sensor for judging the degree of substitution,and the degree of substitution of modified SCP-TENG can be inferred by the magnitude of the current of the modified SCP-TENG.As a TENG applied to measure the degree of substitution of compounds,it is expected to become a new direction for the development of chemical sensors in the future,providing a new method for the measurement of the degree of substitution of compounds.In order to develop the application of SCP-TENG in the field of collecting raindrops,the physical method of adsorbing acrylonitrile(A)-butadiene(B)-styrene(S)copolymer(ABS)and polylactic acid(PLA)on the surface of SCP was adopted.And the chemical method of grafting methyl methacrylate(MMA)monomer to hydrophobically modify SCP,and use it to make hydrophobic SCP-TENG to collect raindrop energy.In the physical modification,the SCP and its TENG soaked in 10 g/L ABS had the best hydrophobicity and electrical properties,the water contact angle was113.1°,and the short-circuit current,open-circuit voltage and charge were 14.8μA,16V and 81 n C,respectively.In the chemical modification,the SCP and its TENG with the addition of 50μL of MMA had the best hydrophobicity and electrical properties,with a water contact angle of 106.7°,open-circuit current,short-circuit voltage and charge of 12.3μA,12 V and 51 n C,respectively.However,due to physical adsorption,the polymer was prone to fall off the surface of the SCP,resulting in a decrease in the hydrophobicity of the SCP and its destruction by the water flow.In contrast,chemically modified sisal cellulose paper-based TENGs are more suitable for promotion and application in daily life.