Preparation And Application Of Functionalized Cellulose Nanofibrils–based Triboelectric Nanogenerator

Based on the related problems arising from the large demand for global energy,TENG is likely to become a new type of energy collection method of great significance in the new era.As an important part of TENG,triboelectric materials are directly related to the output performance,environmental adaptability and production cost of TENG.Lignocellulose is an important resource that human society depends on.It is a kind of high-quality natural polymer material with rich sources,natural regeneration and biodegradability.Especially,cellulose nanofibrils obtained by chemical,physical or biological treatment are Excellent mechanical properties,optical properties and chemical modifiability.Therefore,it has great application prospects in the construction of TENG materials.In this paper,CNF extracted from the rich bagasse resources in Guangxi is used as the basic material.On the one hand,from the perspective of polar design and shape design,we have made explorations and efforts for high-performance,low-cost,green and environmentally friendly CNF-based TENG.Through amino modification and nano silver particle coating,a CNF/PEI/Ag film with higher triboelectricity and nano-scale surface structure was fabricated.As TENG friction material,the open circuit voltage,short circuit current and transferred charge amount are increased by 47.1 %,83.3 % and 50 % compared with pure CNF material.In addition to high-performance CNF/PEI/Ag films,we aimed at the effect of humidity on TENG output,and cross-linked CNF and silica nanoparticles by using MTMS and HDTMS as hydrophobic modification agents to obtain super-hydrophobic CNF/TSM films.Compared with unmodified CNF films,TENG based on silane-modified CNF/TSM films has excellent moisture resistance.It can maintain 60 % of the initial electrical output at 85% humidity,which is about 4 times higher than that of pure CNF.On the other hand,a highly efficient TENG with three-dimensional gear-like structure structure is proposed.This structure not only improves the space utilization,but also makes TENG have the flexibility of multi-directional energy collection and good integration.The electrical output can directly power 80 commercial light-emitting diodes.This TENG also exhibits exceptional sensitivity and responsiveness when used as a self-powered sensor.In addition,we further integrated the gear-like structure into the new TENG design and prepared a rectangular TENG device with internal grid channels.A single device can generate an open circuit voltage of 85 V and a short circuit current of 5 ?A in a water wave,and it has broad application prospects in the field of blue energy collection.This study not only introduces two green CNF-based triboelectric material,but also presents for the first time a high-performance TENG with a gear-like structure and applies it to self-powered sensing.The results of this study provide new insights into TENG manufacturing and applications.