Flexible micro-supercapacitors fabricated from MnO2 nanosheet/graphene composites with black phosphorus additive

• Published in: Progress in natural science Vol. 32; no. 1; pp. 10 - 19
• Main Authors: Liu, Baocheng, Cao, Zongsheng, Yang, Zhengchun, Qi, Wen, He, Jie, Pan, Peng, Li, Huayi, Zhang, Ping
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2022; School of Electrical and Electronic Engineering,Advanced Materials and Printed Electronics Center,Tianjin Key Laboratory of Film Electronic&Communication Devices,Tianjin University of Technology,Tianjin,300384,China%CISRI HIPEX Technology Co,LTD,China Iron&Steel Research Institute Group,Beijing,100081,China%School of Electrical and Information Engineering,Tianjin University,Tianjin,300072,PR China
• Subjects: Black phosphorus; Graphene; Manganese dioxide nanosheets; Micro-supercapacitor; Micro-supercapacitor; Graphene; Manganese dioxide nanosheets; Black phosphorus
• ISSN: 1002-0071
• DOI: 10.1016/j.pnsc.2021.10.008

Supercapacitors are widely used for powering flexible/wearable electronics owing to their excellent charge storage capabilities. In this study, MnO2 nanosheets were grown on the surface of graphene using a simple water bath method to prepare graphene/MnO2 composites for fabricating supercapacitors. In addition, two-dimensional black phosphorus was introduced as an additive into the electronic ink based on the as-prepared graphene/MnO2 composites. The characterization and electrochemical analyses results showed that adding black phosphorus considerably improved the capacitive performance of the material, yielding a high specific capacitance of 241.5 ​F ​g-1 at 0.1 ​A ​g-1 and an impressive rate capability improvement from 52.5% to 80.3%. Then the micro-supercapacitor having an area-specific capacitance of 20.15 ​mF ​cm-2 at a scanning rate of 2 ​mV ​s-1 was utilized to demonstrate the practical applicability of this material. To further evaluate the practical applicability of this micro-supercapacitor, the micro-supercapacitor was integrated with a flexible thin-film pressure sensor on paper and cloth through screen printing. Concentric circular flexible supercapacitors with good electrochemical properties are prepared using graphene/manganese dioxide nanoplates doped with black phosphorus and used as energy storage devices to power flexible sensing systems. [Display omitted] •MnO2/Graphene composites were prepared through the facile water bath method.•MnO2/Graphene/Black phosphorus conductive ink was prepared with black phosphorus as additive.•Black phosphorus enhanced the capacitive performance of the MnO2/Graphene/Black phosphorus material.•The composite showed a high specific capacitance of 241.5 ​F ​g-1 at 0.1 ​A ​g-1.•The MnO2/Graphene/Black phosphorus composite electrode is suitable for flexible wearable electronics.