Design Of Moist Electric Generators Based On Lignocellulosic

Human body breathing and plant transpiration have been exchanged with the environment,and the energy contained in it has been ignored for a long time.Moist-Electric Generator(MEG)can convert the energy contained in the ambient humidity into electrical energy,and has the advantages of simple structure,continuous power generation and direct current generation.However,in respiration and transpiration,MEG has lower voltage and slower generate speed,and most of the preparation process is cumbersome,energy-consuming,high cost and non-renewable materials.Due to its natural micro-pores and rich hydrophilic functional groups,lignocellulosic materials have intrinsic moist-ectricity effect,and come from a wide range of sources,are abundant,renewable and degradable,which is an ideal candidate material for the preparation of MEG.Therefore,inspired by human respiration and plant transpiration,the design and construction of lignocellulosic-based MEG,which can directly convert the energy in environmental moisture into electricity,will improve the energy structure,it is of great strategic significance to promote the efficiency of energy utilization and promote the sustainable development of economy and society.Therefore,this study designed two types of moisture generator from the structure: One is a kind of MEG based on wood morphological skeleton cellulose.Based on the unidirectional pores of wood,nano-channels,heterostructures and sodium ion gradients are constructed,which endow the MEG with high voltage and fast generation.The other is based on multi-stage nano-cellulose structure of MEG.A multi-scale hierarchical nano-cellulose membrane with a large number of nano-pores and a micro-vein network on its surface is designed,which is characterized by high-voltage and high-humidity sensitivity of the MEG,the aim of this paper is to obtain electrical energy efficiently from plant transpiration.The summarized as follows:(1)There are abundant unidirectional micro-and nano-pores and hydrophilic functional groups in the Wood Morphological Cellulose Skeleton Based Moist-Electric Generator(WSMEG),which is helpful for its rapid power generation and monitoring of respiratory changes.Heterostructure and sodium ion gradient can promote its rapid generation of high voltage DC.At 4.40 KPa vapor pressure and 1.4 mm thickness,the maximum voltage is about780 m V.The concept verifies the application scenario that it generates electricity from human respiration to power wearable devices and to be a respiratory sensor.During breathing,the voltage produced fluctuates between 500 and 780 m V,and the current is DC.The resulting electrical energy can be stored,and a 33 μF capacitor can be charged to 0.7 V in 10 seconds.In addition,it can also be used as a self-powered respiratory sensor to monitor the changes of the respiratory frequency of the human body.(2)In the Multi-Level Nanocellulose Based Moist Electric Generator(MMEG),nano-pores make it produce higher voltages and respond to weak humidity changes,and micro-networks help it to generate continuously,the heterostructure and the unilateral moisture structure further enhance the voltage.At 4.40 KPa and 37.0 μm thickness,the MMEG voltage reaches the highest,about 600 m V.MMEG produces relatively stable voltage at bending angles of 0°,30°,60° and 90°,which is about 600 m V,indicating that it has good flexibility and anti-interference ability,and has the potential to obtain energy from plants and human body.The concept verifies the application scenario of MMEG generating electric energy from the moisture of plant transpiration.MMEG can generate about 600 m V DC from plant transpiration,and its voltage curve is similar to that of human respiration,which can reflect the weak humidity change in plant transpiration.In addition,MMEG can convert the moisture emitted from the surface of human skin into a voltage of 200～550 m V,and the moisture during breathing into a voltage of 400～700 m V.At the same time,it is suitable for corresponding moisture sensing detection to monitor the transpiration of plants,the respiratory changes of human body and the state of skin.Both studies have shown that a lignocellulose-based MEG can convert the energy contained in the body’s respiration into electricity,the energy contained in plant transpiration into electricity,and can be used as a sensor,monitoring the changes of human respiration and plant transpiration has a broad application prospect in the era of intelligent wearable.