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Paper or flexible supercapacitor*

Hai-Tao Wang, Ya-Nan Liu, Xiao-Hui Kang, Yi-Fan Wang, Shi-Yi Yang, Shao-Wei Bian, Quan Zhu
A high-performance yarn-shaped supercapacitor electrode material with light weight, small volume, flexibility and low cost, is highly desirable for the development of flexible energy storage devices. Herein, a cotton/Au/nickel cobalt sulfide hybrid yarn electrode was designed and synthesized by electrodepositing nickel cobalt sulfide nanosheet arrays on the Au metalized cotton yarn. The metalized cotton yarn as a conductive substrate ensures rapid electron transportation. The porous layer which constructed by CoNi2 S4 nanosheet arrays significantly enlarges the interface between the electrolyte ions and electrode materials, providing large electroactive surface area for the faradic redox reactions...
August 4, 2018: Journal of Colloid and Interface Science
Saisai Zhou, Zhaochun Ye, Sizhong Hu, Chen Hao, Xiaohong Wang, Chengxiang Huang, Fangsheng Wu
Zeolitic imidazolate frameworks have stimulated great attention due to their potential applications in energy storage, catalysis, gas sensing, drug delivery etc. In this paper, the three-dimensional porous nanomaterial Co3O4/ZnCo2O4/CuO with hollow polyhedral nanocage structures and highly enhanced electrochemical performances was synthesized successfully by a zeolitic imidazolate framework-67 route. The composites hold the shape of the ZIF-67 templates well and the shell has multiple compositions. In the process, we first synthesized the nanostructure hydroxide precursors and then transformed them into the corresponding metal oxide composites by thermal annealing in air...
August 10, 2018: Nanoscale
Jie Zhou, Hui Wang, Wei Yang, Shengji Wu, Wei Han
Chitosan has high synthetic flexibility, making it a promising nitrogenous bioresource for industrial applications. Nitrogen-rich hierarchically porous carbon (NHPC) was successfully synthesized by hydrothermal carbonization and self-activation of a chitosan-transition metal ion (Zn2+ ) complex. The N2 adsorption-desorption isotherm revealed that the as-made NHPC had large specific surface area (1067 m2  g-1 ) and a unique hierarchical pore structure (0.6-6.4 nm). Scanning electron microscopy (SEM) indicated a 3D finely interconnected nest architecture for NHPC...
October 15, 2018: Carbohydrate Polymers
Tingrui Lin, Mengni Shi, Furong Huang, Jing Peng, Qingwen Bai, Jiuqiang Li, Maolin Zhai
High-performance hydrogel electrolytes play a crucial role in flexible supercapacitors (SCs). However, the unsatisfactory mechanical properties of widely-used polyvinyl alcohol-based electrolytes greatly limit their use in the flexible SCs. Here a novel Li2 SO4 -containing agarose/polyacrylamide double-network (Li-AG/PAM DN) hydrogel electrolyte was synthesized by a heating-cooling and subsequent radiation-induced polymerization and crosslinking process. The Li-AG/PAM DN hydrogel electrolyte possesses extremely excellent mechanical properties with a compression strength of 150 MPa, a fracture compression strain of above 99...
August 8, 2018: ACS Applied Materials & Interfaces
Jian Gao, Changxiang Shao, Shengxian Shao, Feng Wan, Chang Gao, Yang Zhao, Lan Jiang, Liangti Qu
The micro-supercapacitors are of great value for portable, flexible, and integrated electronic equipments. Here, the large-scale and integrated asymmetrical micro-supercapacitor (AMSC) array is fabricated in virtue of the laser direct writing and electrodeposition technology. The AMSC shows the ideal flexibility, high areal specific capacitance (21.8 mF cm-2 ), and good rate capability. Moreover, its energy density reaches 12.16 µW h cm-2 , outperforming most micro-supercapacitors reported previously. Meanwhile, large-scale series-connected AMSCs are integrated on the flexible substrates (e...
August 7, 2018: Small
Zhiyu Wang, Si Qin, Shayan Seyedin, Jizhen Zhang, Jiangting Wang, Ariana Levitt, Na Li, Carter Haines, Raquel Ovalle-Robles, Weiwei Lei, Yury Gogotsi, Ray H Baughman, Joselito M Razal
Yarn-shaped supercapacitors (YSCs) once integrated into fabrics provide promising energy storage solutions to the increasing demand of wearable and portable electronics. In such device format, however, it is a challenge to achieve outstanding electrochemical performance without compromising flexibility. Here, MXene-based YSCs that exhibit both flexibility and superior energy storage performance by employing a biscrolling approach to create flexible yarns from highly delaminated and pseudocapacitive MXene sheets that are trapped within helical yarn corridors are reported...
August 7, 2018: Small
Min Zhong, Fangwei Zhang, Youyi Yu, Jiali Zhang, Wenzhuo Shen, Shouwu Guo
Flexible micro-supercapacitor (MSCs) as power supplier is of importance to portable and wearable electronic devices. Despite enormous efforts made, a simple, inexpensive high-throughput technique of graphene-based MSCs is still challenging. In this work, flexible MSCs is fabricated through commercial laser printing of the interdigital configuration of reduced graphene oxide-graphene oxide-reduced graphene oxide (rGO-GO-rGO) where the conductive rGO works as electrodes and the insulated GO serves as separator...
August 7, 2018: Nanotechnology
Litty V Thekkekara, Xi Chen, Min Gu
Direct laser writing with an ultrashort laser beam pulses has emerged as a cost-effective single step technology for realizing high spatial resolution features of three-dimensional structures in confined footprints with potential for large area fabrication. Here we present the two-photon direct laser writing technology to develop high-performance stretchable biomimetic three-dimensional micro-supercapacitors with the fractal electrode distance down to 1 µm. With multilayered graphene oxide films, we show the charge transfer capability enhanced by order of 102 while the energy storage density exceeds the results in current lithium-ion batteries...
August 6, 2018: Scientific Reports
Hua Zhang, Ping Zhang, Hanzhi Zhang, Xiaohong Li, Lin Lei, Lina Chen, Zijian Zheng, You Yu
Economical and abundant nature biological materials provide a low-cost and scalable approach to develop next-generation flexible and wearable electronics. Herein, a universal strategy of nature-inspired and amine-promoted metallization, namely NIAPM, is presented to make high-quality metals for electronics fabrication. The introduction of poly(ethyleneimine) (PEI) significantly shortens the time of metallization from >48 h to ≈ 6 h, and the phenol compounds (TP) from green tea make metals tightly on all demonstrated surfaces...
August 6, 2018: ACS Applied Materials & Interfaces
Tianfeng Qin, Shan Dang, Jiaxin Hao, Zilei Wang, Haoqian Li, Yuxiang Wen, Shuqi Lu, Deyan He, Guozhong Cao, Shanglong Peng
Owing to a lack of electroactive sites and poor conductivity, Co oxides/hydroxides nanosheet network electrodes usually show low experimental capacity, hardly meeting the demand for high energy density needed for an asymmetric supercapacitor. Herein, we demonstrate a surface capacity enhancement of a 3D cobalt oxides/hydroxides nanosheet network cathode through a simple cyclic voltammetry electro-deposition method. By optimizing the electro-deposition parameters, the as-prepared Co oxides/hydroxides nanosheet network electrode delivers a significantly high capacity of 427 C g-1 at the current density of 1 A g-1 and excellent rate ability of 79...
August 3, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yangyang Shang, Juan Zhang, Liao Xu, Huaizhi Liu, Bo Zhou, Yawen Tang, Lihua Zhu, Xinning Jiang, Xiaoqing Jiang
In this paper, a graphene/nickel-cobalt hydroxide ternary hydrogel (G-Ni-Co) with superior electrochemical performances was prepared by a simple hydrothermal method using Ni(NO3 )2 ·6H2 O, Co(NO3 )2 ·6H2 O, and graphene oxide as the starting materials. The mass fraction and the pH value of the reaction system were optimized. The prepared G-Ni-Co was assembled into a symmetric supercapacitor and its electrochemical performance was estimated. In a symmetric supercapacitor, the specific capacitance of G-Ni-Co is 551...
July 24, 2018: Journal of Colloid and Interface Science
Cheng Ma, Songju Ruan, Jitong Wang, Donghui Long, Wenming Qiao, Licheng Ling
Free-standing carbon nanofiber fabrics with high surface area and good flexibility were prepared via a combined electrospinning and nanocasting method using low molecular weight phenolic resol as carbon precursor and partial-hydrolyzed tetraethyl orthosilicate as template, followed by carbonization and silica removal. The key to our strategy lies in the formation of a stable electrospinning solution derived from the polycondensation of partial-hydrolyzed TEOS in mild hydrolysis with low molecular phenolic resol and PVB which could decrease the gelation rate to benefit for the steady electrospinning process of preparing large area hybrid nanofiber fabrics...
June 30, 2018: Journal of Colloid and Interface Science
Abdul Khayum M, Vidyanand Vijayakumar, Suvendu Karak, Sharath Kandambeth, Mohitosh Bhadra, Karthika Suresh, Nikhil Acharambath, Sreekumar Kurungot, Rahul Banerjee
The flexible supercapacitors in modern electronic equipment require light-weight electrodes which have ahigh surface area, precisely integrated redox moieties, and mechanically strong flexible free-standing nature. However, the incorporation of the aforementioned properties into a single electrode remains a great task. Herein, we could overcome these challenges by a facile and scalable synthesis of the convergent covalent organic framework (COF) free-standing flexible thin-sheets through solid-state molecular baking strategy...
July 27, 2018: ACS Applied Materials & Interfaces
Libo Gao, Jian Song, James Utama Surjadi, Ke Cao, Ying Han, Dong Sun, Xiaoming Tao, Yang Lu
Portable fiber supercapacitors with high-energy storage capacity are in great demand to cater for the rapid development of flexible and deformable electronic devices. Hence, we employed a 3D cellular copper foam (CF) combined with the graphene sheets (GSs) as the support matrix to bridge the active material with nickel fiber (NF) current collector, significantly increasing surface area and decreasing the interface resistance. In comparison to the active material directly growing onto the NF in the absence of CF and GSs, our rationally designed architecture achieved a joint improvement in both capacity (0...
August 2, 2018: ACS Applied Materials & Interfaces
Manpreet Kaur, Manmeet Kaur, Virender K Sharma
Doping of nitrogen is a promising strategy to modulate chemical, electronic, and structural functionalities of graphene (G)and graphene quantum dots (GQDs) for their outstanding properties in energy and environmental applications.This paper reviews various synthesis approaches of nitrogen-doped graphene (N-G) and nitrogen-doped graphene quantum dots (N-GQDs).;Thermal, ultrasonic, solvothermal, hydrothermal, and electron-beam methods have been applied to synthesize N-G and N-GQDs.These nitrogen-doped carbon materials are characterized to obtain their structural configurations in order to achieve better performance in their applications compared to only either graphene or graphene quantum dots...
July 19, 2018: Advances in Colloid and Interface Science
M Taghavikish, S Subianto, Y Gu, X Sun, X S Zhao, N Roy Choudhury
Polyionic liquid based gels have stimulated significant interest due to their wide applications in flexible electronics, such as wearable electronics, roll-up displays, smart mobile devices and implantable biosensors. Novel supported liquid gel electrolyte using polymerisable ionic liquid and an acrylate monomer, has been developed in this work by entrapping ionic liquid during polymerisation instead of post polymerisation impregnation. The chemically crosslinked polyionic liquid gel electrolyte (PIL) is prepared using 2-hydroxyethylmethacrylate (HEMA) monomer and a polymerisable ionic liquid, 1,4-di(vinylimidazolium)butane bisbromide (DVIMBr) in an ionic liquid (IL- 1-butyl-3 methylimidazolium hexafluorophosphate) as the polymerisation solvent, which resulted in in-situ entrapment of the IL in the gel during polymerisation and crosslinking of the polymer...
July 19, 2018: Scientific Reports
Zhaowei Guo, Yuanyuan Ma, Xiaoli Dong, Jianhang Huang, Yonggang Wang, Yongyao Xia
Rechargeable batteries have been used to power various electric devices and store energy from renewables, but their toxic components (namely, electrode materials, electrolyte, and separator) generally cause serious environment issues when disused. Such toxicity characteristic makes them difficult to power future wearable electronic devices. Now an environmentally friendly and highly safe rechargeable battery, based on a pyrene-4,5,9,10-tetraone (PTO) cathode and zinc anode in mild aqueous electrolyte is presented...
July 18, 2018: Angewandte Chemie
Weina Xu, Junlin Lu, Wangchen Huo, Jien Li, Xue Wang, Cuiling Zhang, Xiao Gu, Chenguo Hu
Flexible and wearable electronic devices with excellent performance have been desired for making the next generation of electronic products. Herein, the synthesis of CuCo2 S4 nanosheets on flexible carbon fiber textile (CFT) by a facile one-step and scalable hydrothermal procedure is reported, which is free from the sulphurization process used in the conventional synthesis of mixed metal sulphospinels. The as-prepared CuCo2 S4 nanostructures on CFT can provide rich reaction sites and short ion diffusion paths...
August 7, 2018: Nanoscale
Liang Huang, Diana Santiago, Patricia Loyselle, Liming Dai
Along with the quick development of flexible and wearable electronic devices, there is an ever-growing demand for light-weight, flexible, and wearable power sources. Because of the high power density, excellent cycling stability and easy fabrication, flexible supercapacitors are widely studied for this purpose. Graphene-based nanomaterials are attractive electrode materials for flexible and wearable supercapacitors owing to their high surface area, good mechanical and electrical properties, and excellent electrochemical stability...
July 15, 2018: Small
Kayeon Keum, Geumbee Lee, Hanchan Lee, Junyeong Yun, Heun Park, Soo Yeong Hong, Changhoon Song, Jung Wook Kim, Jeong Sook Ha
A wire-shaped supercapacitor (WSS) has structural advantages of high flexibility and ease of incorporation into conventional textile substrates. In this work, we report a thin reproducible WSS fabricated via layer-by-layer (LbL) assembly of multiwalled carbon nanotubes (MWCNTs), combined with an organic electrolyte of propylene carbonate (PC)-acetonitrile (ACN)-lithium perchlorate (LiClO4 )-poly(methyl methacrylate) (PMMA) that extends the voltage window to 1.6 V. The MWCNTs were uniformly deposited on a curved surface of a thin Au wire using an LbL assembly technique, resulting in linearly increased areal capacitance of the fabricated WSS...
July 25, 2018: ACS Applied Materials & Interfaces
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