Preparation and application of self-healing polyvinyl alcohol/bacterial cellulose hydrogel electrolyte

被引：10

作者：

Tao X.-Y. ^{[1
]}

Ma W.-B. ^{[1
]}

Han X.-D. ^{[1
]}

Zhu K.-H. ^{[1
]}

Ye S.-F. ^{[1
]}

Sha H. ^{[1
]}

Guo L. ^{[1
]}

Wei X.-Y. ^{[2
,3
]}

Xu C. ^{[4
]}

Zhu S.-G. ^{[4
]}

机构：

[1] School of Materials Science and Physics, China University of Mining and Technology, Xuzhou

[2] School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou

[3] Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining and Technology, Xuzhou

[4] Technology Center of Huaibei Mining Group, Huaibei

来源：

Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2022年 / 50卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Bacterial cellulose; Composite hydrogel electrolyte; Polyvinyl alcohol; Self-healing; Supercapacitor;

D O I：

10.1016/S1872-5813(21)60179-2

中图分类号：

学科分类号：

摘要：

Polyvinyl alcohol (PVA), bacterial cellulose (BC) and sulfuric acid were used as raw materials to prepare PVA/BC composite hydrogel electrolyte (CHEPVA/BC) by physical cross-linking freezing-thawing cycle method. After freeze-thaw cycles, PVA and BC form a large number of intermolecular hydrogen bonds, which endow the composite hydrogel with good self-healing property (SHP) and mechanical properties (MPs). The effect of BC content (BCC) on MPs and ionic conductivity (IC) of CHEPVA/BC were discussed. The results show that the composite hydrogel with BCC of 0.6% has the best SHPs and MPs, with breaking strength and IC as high as 0.41 MPa and 138.9 mS/cm, respectively. After the first healing cycle (FHC), IC and healing rate still reach 84.1 mS/cm and 74%, respectively. Polyaniline electrode was polymerized in-situ on the surface of the self-healing CHEPVA/BC, and a flexible all-in-one supercapacitor was designed and assembled. The results show that when aniline concentration is 0.2 mol/L, the supercapacitor device achieves high specific capacitance (580.8 mF/cm2), excellent energy density (20.17 μW·h/cm2) and power density (50 μW/cm2) at current density of 0.2 mA/cm2, and the capacitance retention rate after the FHC reaches 66%, showing good self-healing performance and great potential to maintain mechanical integrity and electrochemical stability. These findings indicate that the self-healing CHEPVA/BC has great application prospects in flexible wearable energy storage devices. Copyright ©2022 Editorial Dept. of Journal of Fuel Chemistry and Technology. All rights reserved.

引用

页码：304 / 313

页数：9

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