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Paper or flexible supercapacitor*

Xinxu Jia, Xiang Wu, Baodan Liu
In this work, ZnCo2O4@MnO2 core-shell structures are successfully prepared on nickel foam by a simple hydrothermal approach. The obtained core-shell structures exhibit excellent areal capacitance and cycling stability, which may be ascribed to the rational design of a hybrid-material based electrode structure that facilitates ion transport. The as-assembled supercapacitor device shows outstanding specific capacitance, demonstrating that ZnCo2O4@MnO2 core-shell structure is a candidate as a supercapacitor electrode material in flexible energy storage applications...
October 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Jiangfeng Gong, Jing-Chang Li, Jing Yang, Shulin Zhao, Ziyuan Yang, Kaixiao Zhang, Jianchun Bao, Huan Pang, Min Han
Orientation and hybridization of ultrathin two-dimensional (2D) nanostructures on interdigital electrodes is vital for developing high-performance flexible in-plane micro-supercapacitors (MSCs). Despite great progress has been achieved, integrating CuSe and Ni(OH)2 nanosheets to generate advanced nanohybrids with oriented arrangement of each component and formation of porous frameworks remains a challenge, and their application for in-plane MSCs has not been explored. Herein, the vertically-aligned CuSe@Ni(OH)2 hybrid nanosheet films with hierarchical open channels are skillfully deposited on Au interdigital electrodes/polyethylene terephthalate substrate via a template-free sequential electrodeposition approach, and directly employed to construct in-plane MSCs by choosing polyvinyl alcohol-LiCl gel as both the separator and solid electrolyte...
October 18, 2018: ACS Applied Materials & Interfaces
Qiuyue Gui, Jian Jiang, Yuanyuan Li, Jinping Liu
A one-pot route for coaxial growth of crystallized Co(OH)2 nanowire arrays on flexible carbon cloth (Co(OH)2/CC) has been developed for high-performance bendable pseudocapacitive electrodes. The hydrothermal process is found to result in in situ generation of hydrophilic groups on CC (in situ functionalized), changing its wettability and simultaneously helping the nucleation of Co(OH)2. Electrochemical tests evidence that the Co(OH)2/CC can function as a high-performance electrode with a high areal capacitance up to ∼1...
October 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
M Manoj, C Muhamed Ashraf, M Jasna, K M Anilkumar, B Jinisha, V S Pradeep, S Jayalekshmi
Lithium-sulfur (Li-S) cells are emerging as the dominant constituents of the next generation battery technology, offering high theoretical capacity around 1675 mA h g-1 and the additional advantages of low cost and non-toxic nature. Activated carbon, derived from natural resources is being extensively investigated for applications as electrode materials in high power supercapacitors and for making composite electrodes for designing high energy density electrochemical cells. The present work is aimed at introducing the potential of the composite cathode of sulfur with the biomass-derived, steam activated carbon (AC) along with the free-standing and flexible film of carbon nanotubes as the interlayer for designing efficient Li-S cells...
October 1, 2018: Journal of Colloid and Interface Science
Lukas Vojtech, Marek Neruda, Tomas Reichl, Karel Dusek, Cristina de la Torre Megías
In this paper, the surface area of coated polymer-based textiles, i.e., copper and nickel plated woven polyester fabric, copper and acrylic coated woven polyester fabric, and copper and acrylic coated non-woven polyamide fabric, is investigated. In order to evaluate the surface area of the woven fabrics, Peirce's geometrical model of the interlacing point and measurement using an electron microscope are used. Non-woven fabrics are evaluated using an optical method, handmade method, and MATLAB functions. An electrochemical method, based on the measurement of the resistance between two electrodes, is used for relative comparison of the effective surface area of the coated woven and non-woven fabrics...
October 10, 2018: Materials
Ammar Tatlisu, Zhifeng Huang, Ruiyong Chen
Symmetric aqueous high voltage supercapacitors up to 3 V have been demonstrated using concentrated aqueous 1-butyl-3-methylimidazolium chloride (BMImCl), namely, "water-in-imidazolium chloride", as working electrolytes, and graphene nanoplatelets coated carbon paper as electrodes. Performance enhancement was further achieved either through adding redox species such as 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (4hT) into the electrolytes (110 Wh kg-1- for a 20 m BMImCl/H2O with 0.1 M 4hT) or by pre-inserting ClO4- anions into the graphene platelets...
October 9, 2018: ChemSusChem
Qijun Zong, Qichong Zhang, Xue Mei, Qiulong Li, Zhenyu Zhou, Dong Li, Mingyuan Chen, Feiyang Shi, Juan Sun, Yagang Yao, Zengxing Zhang
Flexible fiber-shaped supercapacitors hold promising potential in the area of portable and wearable electronics. Unfortunately, their general application is hindered by the restricted energy densities due to low operating voltage and small specific. Herein, an all-solid-state fiber-shaped asymmetric supercapacitor (FASC) possessing ultrahigh energy density is reported, in which the positive electrode was designed as Na-doped MnO2 nanosheets on carbon nanotube fibers (CNTFs) and the negative electrode as MoS2 nanosheets coated CNTFs...
October 9, 2018: ACS Applied Materials & Interfaces
Chaoji Chen, Liangbing Hu
Cellulose is the most abundant biopolymer on Earth and has long been used as a sustainable building block of conventional paper. Note that nanocellulose accounts for nearly 40% of wood's weight and can be extracted using well-developed methods. Due to its appealing mechanical and electrochemical properties, including high specific modulus (∼100 GPa/(g/cm3 )), excellent stability in most solvents, and stability over a wide electrochemical window, nanocellulose has been widely used as a separator, electrolyte, binder, and substrate material for energy storage...
October 9, 2018: Accounts of Chemical Research
Lushuai Zhang, Wesley Viola, Trisha L Andrew
Lightweight energy storage technologies are integral for powering emerging wearable health monitors and smart garments. In-plane, interdigitated microsupercapacitors (MSCs) hold the greatest promise to be integrated into wearable electronics, due to their miniaturized footprint, as compared to conventional, multilayered supercapacitors and batteries. Constructing MSCs directly on textiles, while retaining the fabric's pliability and tactile quality, will provide uniquely wearable energy storage systems. However, relative to plastic-backed or paper-based MSCs, garment-integrated MSCs are underreported...
October 8, 2018: ACS Applied Materials & Interfaces
Pengcheng Dai, Yanming Xue, Shuo Zhang, Lei Cao, Daiming Tang, Xin Gu, Liangjun Li, Xuebin Wang, Xiangfen Jiang, Dandan Liu, Lingzhao Kong, Yoshio Bando, Dmitri V Golberg, Xuebo Zhao
Heteroatom-doped three dimensional (3D) carbon fiber networks have attracted immense interest because of their extensive applications in energy storage devices. However, their practical production and usage remain a great challenge due to the costly and complex synthetic procedures. In this work, flexible B, N, and O heteroatom-doped 3D interconnected carbon microfiber networks (BNOCs) with controllable pore sizes and elemental contents were successfully synthesized via a facile one-step "chemical vapor etching & doping" (CVE&D) method by using cellulose-made paper, the most abundant and cost-effective biomass, as original network-frame precursor...
October 8, 2018: ACS Applied Materials & Interfaces
Akbar Mohammadi Zardkhoshoui, Saied Saeed Hosseiny Davarani
Pseudocapacitive electrode materials employed in supercapacitors may bring in high energy density (ED) and specific capacitance (Csc ), which are critical for their practical applications. Accordingly, logical design of advanced electrode materials is highly demanded to progress high-performance supercapacitors. Here, for the first time, we suggest a straightforward route for the synthesis of NiGa2 S4 -rGO as an advanced cathode material supported on nickel foam (NF) for employed in flexible solid-state asymmetric supercapacitors (FSASCs)...
September 29, 2018: Journal of Colloid and Interface Science
Yunhui Shi, Yan Zhang, Limin Jia, Qian Zhang, Xinhua Xu
Next-generation wearable electronics are expected to endure significant deformations and mechanical damage. Therefore, self-healing stretchable electrolytes with high ionic conductivity and robust mechanical strength, that are high tolerance of deformations and to spontaneously recover electrochemical properties after external damage, are necessary conditions for the realization of flexible supercapacitors. Here, a new type of zwitterionic supramolecular hydrogels crosslinked through rationally designed ionic associations and hydrogen bonds is reported (PAD/H2SO4)...
September 28, 2018: ACS Applied Materials & Interfaces
Jiarui Tian, Zhoufei Yang, Zefang Yin, Zhenzhen Ye, Jin Wang, Chaojie Cui, Weizhong Qian
Graphene is a hot star in materials science with various potential application aspects, including in Li-ion battery and supercapacitor. The burst of scientific papers in this area seems to validate the performance of graphene, but also arouses large dispute. Herein, we share our judgment of these trends to all, encouraging the discussion and enhancing the understanding of the structure-performance relationship of graphene.
September 24, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Sreekanth J Varma, Kowsik Sambath Kumar, Sudipta Seal, Swaminathan Rajaraman, Jayan Thomas
Wearable electronic devices represent a paradigm change in consumer electronics, on-body sensing, artificial skins, and wearable communication and entertainment. Because all these electronic devices require energy to operate, wearable energy systems are an integral part of wearable devices. Essentially, the electrodes and other components present in these energy devices should be mechanically strong, flexible, lightweight, and comfortable to the user. Presented here is a critical review of those materials and devices developed for energy conversion and storage applications with an objective to be used in wearable devices...
September 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Ai-Lan Yan, Xin-Chang Wang, Ji-Peng Cheng
The research on supercapacitors has been attractive due to their large power density, fast charge/discharge speed and long lifespan. The electrode materials for supercapacitors are thus intensively investigated to improve the electrochemical performances. Various transition metal layered double hydroxides (LDHs) with a hydrotalcite-like structure have been developed to be promising electrode materials. Earth-abundant metal hydroxides are very suitable electrode materials due to the low cost and high specific capacity...
September 20, 2018: Nanomaterials
Chan Wang, Kuan Hu, Wenjian Li, Huaying Wang, Hu Li, Yang Zou, Chaochao Zhao, Zhe Li, Min Yu, Puchuan Tan, Zhou Li
With the advantages of being lightweight, flexible, and wearable, wire-shaped supercapacitors have received tremendous attention in wearable and portable power sources in recent years. Considering the demands for large-scale applications, it is necessary to explore a facile and convenient preparation approach for wire-shaped supercapacitors. Herein, we reported a simple approach to fabricate wire-shaped electrodes by a dipping method, which possessed a nitric acid-activated graphite fiber core and an activated carbon-coating layer structure...
October 10, 2018: ACS Applied Materials & Interfaces
Pengxiao Sun, Weidong He, Hongcen Yang, Ruya Cao, Jiangmei Yin, Chenggang Wang, Xijin Xu
High-security deformable energy-storage devices that are mechanically robust, with considerable energy and power densities are becoming desirable for smart wearable electronics. Here, a highly flexible hydrogel-based all-solid-state hybrid supercapacitor was rationally designed and assembled, with unique NiCo2O4@NixCoyMoO4 (x : y = 3 : 1) nanostructures as the electrode, which was bio-inspired by the curling up and relaxation of hedgehogs. The hybrid supercapacitor shows no obvious decay in capacitance during bending to different states, indicating its outstanding flexibility and mechanical stability...
October 18, 2018: Nanoscale
Xibin Liu, Gaohua Liao, Xiang Qi, Xiaoan Mei, Jifei Wang, Yong Wei, Kun Qian, Chang Li, Wei Tao, Jiayou Tao
Hybrid fibers based on MnO2/reduced graphene oxide have been fabricated for flexible energy storage devices. Graphene oxide nanoflakes were reduced in a polytetrafluoroethylene (PTFE) pipeline under the appropriate condition to develop a fiber current collector, which also provides the possibility of weaving. The RGO fiber with the radius of about 35 μm has a resistance of 150 Ω · cm. MnO2 nanoflakes directly grow on the RGO fiber surface acting as the electrode material of the device. The MnO2/RGO hybrid fibers provide excellent energy storage performances...
December 1, 2018: Journal of Nanoscience and Nanotechnology
Zhao Fang, Jiaxin Peng, Nani Ma, Lisi Liang, Hongquan Gao, Haitao Zhou, Xinkai Jin, Jianhong Yang, Manbo Liu, Jinjing Du, Qian Li, Xiaoming Li, Linbo Li
Lithium ion batteries with graphite negative electrodes have been developed to date due to their low power density, which limits their application in many cases, however. Nanoscale Li4Ti5O12 has higher power density than conventional graphite anode materials. In order to ensure that the full-cell system has high power and high energy, cathode materials are very important. In this paper, three different cathode materials, LiNi0.8Co0.15Al0.05O2 (NCA), LiNi0.6Co0.2Mn0.2O2 (NCM622), and LiCoO2 (LCO), were used to conduct a comprehensive study, and optimal NCA-Li4Ti5O12(LTO) full battery system was selected under high power conditions...
December 1, 2018: Journal of Nanoscience and Nanotechnology
Subhash C Singh, Huiyan Li, Chaonan Yao, Z Zhan, Weili Yu, Zhi Yu, Chunlei Guo
In nature, self-healing can be induced by sunlight for damage and wound repair, and this phenomenon is very important to living species for prolonging their lives. This self-repairing feature is obviously highly desirable for non-biological materials and manmade systems. In this paper, we demonstrate, for the first time, that battery electrodes can be self-repaired when exposed to sunlight. Here, we show that the optical, and photoelectrochemical (PEC) properties can be controlled by varying structural and compositional parameters of copper selenide nanocrystals (NCs)...
September 2018: Nano Energy
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