Flexible cyanoethyl cellulose-based nanocomposites with superior energy storage capability

Abstract

Flexible dielectric materials for electrostatic energy storage are irreplaceable advantages to apply in power modules and modern electronics. However, the traditional polymer-based composite films suffer from energy storage performances, for...

Utilizing the synergistic effect between the Schottky barrier and field redistribution to achieve high-density, low-consumption, cellulose-based flexible dielectric films for next-generation green energy storage capacitors

“…5(e) compares the ESD and E/E ratio between the SZS and ZSZ in this work and some new cellulose-based dielectric capacitors that were newly reported. 17,[25][26][27][28][29][30][31]35,[64][65][66][67][68] The two sandwich-structured lms in our work perform very well: the SZS shows the highest value in the ESD with an E/E ratio of 5.17, while the ZSZ has an ESD of only 25.30 J cm −3 , but its E/E ratio reaches as high as 5.57. Such a result indicates that our lms have excellent energy storage performance and consume less energy.…”

“…With morphological control, interface modication, and some other technologies, the energy storage density (ESD) of cellulose/ceramic composites has been increased from 5.7 J cm −3 to 23.5 J cm −3 . [24][25][26][27][28][29][30][31][32] Compared to traditional petroleum-based exible lms, the most signicant advantages of cellulose/ceramic-based ones are much better mechanical properties such as higher tensile strength and elongation at break, 13,33 which enable the latter to be used in more limited environments. However, it still suffers from two main drawbacks: high hydrophilic, which makes it impossible to be used in humid environments, 34 and the difficulty of fabricating multilayer-structure, which is caused by the hydrogen bonds' strong self-assembly behavior and thus inhibits the formation of interfacial polarization.…”

Ultrahigh energy storage capacity in multilayer-structured cellulose-based dielectric capacitors caused by interfacial polarization-coupled Schottky barrier height

“…4d illustrates the comparison of the energy storage performance between our multilayers and some typical cellulose-based dielectric lms. [21][22][23]25,[35][36][37][38][39][40][41][42][43] This Work-1 represents the sandwich structured 0-2-0, and This Work-2 is the uniform structured 2/3-2/3-2/3. Though the h of 0-2-0 has fewer advantages among those systems, its ESD is the highest ever reported.…”

“…22 When using the cyanoethyl cellulose (CRC) as the matrix, in Pan et al ’s work, the CRC-BNNS composites exhibited a quite promising energy storage performance with an ESD of 23.5 J cm −3 and an energy storage efficiency ( η ) of 83.6%. 23 Though these studies open up a new paradigm for developing biomass-based high-performance flexible dielectric capacitors, using the single-phase cellulose as the matrix still suffers from two main disadvantages: (1) poor hydrophobicity, which leads to higher dielectric loss and even short circuits after long-term use; 24 (2) the difficulty of fabricating a multilayer structure, which is thought to be the most crucial way for enhancing the voltage endurance. In our previous work, a cellulose/PVDF blend film instead of single-phase cellulose was used as the matrix material to prepare the BaTiO 3 @cellulose/PVDF (C8P2-BT) nanocomposite films and an ESD of 10.81 J cm −3 was finally obtained.…”

Natural bioproducts’ hybridization creates transient dynamic electret nanogenerators

“…8 Another natural product, cellulose, is the most abundant biomass resource on earth. 3,4,9,26,[28][29][30] Sulfuric acid hydrolysis of natural plant cellulose yields an environmentally compatible, hydrophilic anionic polysaccharide derivative, sulfonated cellulose nanocrystals (S-CNCs). On the surface of S-CNCs, the highly acidic sulfonate groups are covalently immobilized.…”