共查询到20条相似文献,搜索用时 15 毫秒
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Doudou Zhao Wei Chang Chenbao Lu Chongqing Yang Kaiyue Jiang Xing Chang Hualin Lin Fan Zhang Sheng Han Zhongsheng Hou Xiaodong Zhuang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(48)
The rapid development of lightweight and wearable devices requires electronic circuits possessing compact, high‐efficiency, and long lifetime in very limited space. Alternating current (AC) line filters are usually tools for manipulating the surplus AC ripples for the operation of most common electronic devices. So far, only aluminum electrolytic capacitors (AECs) can be utilized for this target. However, the bulky volume in the electronic circuits and limited capacitances have long hindered the development of miniaturized and flexible electronics. In this work, a facile laser‐assisted fabrication approach toward an in‐plane micro‐supercapacitor for AC line filtering based on graphene and conventional charge transfer salt heterostructure is reported. Specifically, the devices reach a phase angle of 73.2° at 120 Hz, a specific capacitance of 151 µF cm?2, and relaxation time constant of 0.32 ms at the characteristic frequency of 3056 Hz. Furthermore, the scan rate can reach up to 1000 V s?1. Moreover, the flexibility and stability of the micro‐supercapacitors are tested in gel electrolyte H2SO4/PVA, and the capacitance of micro‐supercapacitors retain a stability over 98% after 10 000 cycles. Thus, such micro‐supercapacitors with excellent electrochemical performance can be almost compared with the AECs and will be the next‐generation capacitors for AC line filters. 相似文献
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Layer‐by‐Layer Assembled Heteroatom‐Doped Graphene Films with Ultrahigh Volumetric Capacitance and Rate Capability for Micro‐Supercapacitors 下载免费PDF全文
Zhong‐Shuai Wu Khaled Parvez Andreas Winter Henning Vieker Xianjie Liu Sheng Han Andrey Turchanin Xinliang Feng Klaus Müllen 《Advanced materials (Deerfield Beach, Fla.)》2014,26(26):4552-4558
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Panpan Zhang Yang Li Gang Wang Faxing Wang Sheng Yang Feng Zhu Xiaodong Zhuang Oliver G. Schmidt Xinliang Feng 《Advanced materials (Deerfield Beach, Fla.)》2019,31(3)
On‐chip micro‐supercapacitors (MSCs), as promising power candidates for microdevices, typically exhibit high power density, large charge/discharge rates, and long cycling lifetimes. However, as for most reported MSCs, the unsatisfactory areal energy density (<10 µWh cm?2) still hinders their practical applications. Herein, a new‐type Zn‐ion hybrid MSC with ultrahigh areal energy density and long‐term durability is demonstrated. Benefiting from fast ion adsorption/desorption on the capacitor‐type activated‐carbon cathode and reversible Zn stripping/plating on the battery‐type electrodeposited Zn‐nanosheet anode, the fabricated Zn‐ion hybrid MSCs exhibit remarkable areal capacitance of 1297 mF cm?2 at 0.16 mA cm?2 (259.4 F g?1 at a current density of 0.05 A g?1), landmark areal energy density (115.4 µWh cm?2 at 0.16 mW cm?2), and a superb cycling stability without noticeable decay after 10 000 cycles. This work will inspire the fabrication and development of new high‐performance microenergy devices based on novel device design. 相似文献
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Liujun Cao Shubin Yang Wei Gao Zheng Liu Yongji Gong Lulu Ma Gang Shi Sidong Lei Yunhuai Zhang Shengtao Zhang Robert Vajtai Pulickel M. Ajayan 《Small (Weinheim an der Bergstrasse, Germany)》2013,9(17):2905-2910
Micrometer‐sized electrochemical capacitors have recently attracted attention due to their possible applications in micro‐electronic devices. Here, a new approach to large‐scale fabrication of high‐capacitance, two‐dimensional MoS2 film‐based micro‐supercapacitors is demonstrated via simple and low‐cost spray painting of MoS2 nanosheets on Si/SiO2 chip and subsequent laser patterning. The obtained micro‐supercapacitors are well defined by ten interdigitated electrodes (five electrodes per polarity) with 4.5 mm length, 820 μm wide for each electrode, 200 μm spacing between two electrodes and the thickness of electrode is ~0.45 μm. The optimum MoS2‐based micro‐supercapacitor exhibits excellent electrochemical performance for energy storage with aqueous electrolytes, with a high area capacitance of 8 mF cm?2 (volumetric capacitance of 178 F cm?3) and excellent cyclic performance, superior to reported graphene‐based micro‐supercapacitors. This strategy could provide a good opportunity to develop various micro‐/nanosized energy storage devices to satisfy the requirements of portable, flexible, and transparent micro‐electronic devices. 相似文献
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Alternating Stacked Graphene‐Conducting Polymer Compact Films with Ultrahigh Areal and Volumetric Capacitances for High‐Energy Micro‐Supercapacitors 下载免费PDF全文
Zhong‐Shuai Wu Khaled Parvez Shuang Li Sheng Yang Zhaoyang Liu Shaohua Liu Xinliang Feng Klaus Müllen 《Advanced materials (Deerfield Beach, Fla.)》2015,27(27):4054-4061
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Scalable Self‐Propagating High‐Temperature Synthesis of Graphene for Supercapacitors with Superior Power Density and Cyclic Stability 下载免费PDF全文
Chen Li Xiong Zhang Kai Wang Xianzhong Sun Guanghua Liu Jiangtao Li Huanfang Tian Jianqi Li Yanwei Ma 《Advanced materials (Deerfield Beach, Fla.)》2017,29(7)
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Zhiyuan Xiong Xiawei Yun Ling Qiu Youyi Sun Bo Tang Zijun He Jing Xiao Dwayne Chung Tuck Wah Ng Hao Yan Ranran Zhang Xiaogong Wang Dan Li 《Advanced materials (Deerfield Beach, Fla.)》2019,31(16)
Properly controlling the rheological properties of nanoparticle inks is crucial to their printability. Here, it is reported that colloidal gels containing a dynamic network of graphene oxide (GO) sheets can display unusual rheological properties after high‐rate shearing. When mixed with polyaniline nanofiber dispersions, the GO network not only facilitates the gelation process but also serves as an effective energy‐transmission network to allow fast structural recovery after the gel is deformed by high‐rate shearing. This extraordinary fast recovery phenomenon has made it possible to use the conventional air‐brush spray technique to print the gel with high‐throughput and high fidelity on nonplanar flexible surfaces. The as‐printed micro‐supercapacitors exhibit an areal capacitance 4–6 times higher than traditionally spray‐printed ones. This work highlights the hidden potential of 2D materials as functional yet highly efficient rheological enhancers to facilitate industrial processing of nanomaterial‐based devices. 相似文献
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Nano‐RuO2‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density 下载免费PDF全文
Shengli Zhai Chaojun Wang Huseyin Enis Karahan Yanqing Wang Xuncai Chen Xiao Sui Qianwei Huang Xiaozhou Liao Xin Wang Yuan Chen 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(29)
Compactness and versatility of fiber‐based micro‐supercapacitors (FMSCs) make them promising for emerging wearable electronic devices as energy storage solutions. But, increasing the energy storage capacity of microscale fiber electrodes, while retaining their high power density, remains a significant challenge. Here, this issue is addressed by incorporating ultrahigh mass loading of ruthenium oxide (RuO2) nanoparticles (up to 42.5 wt%) uniformly on nanocarbon‐based microfibers composed largely of holey reduced graphene oxide (HrGO) with a lower amount of single‐walled carbon nanotubes as nanospacers. This facile approach involes (1) space‐confined hydrothermal assembly of highly porous but 3D interconnected carbon structure, (2) impregnating wet carbon structures with aqueous Ru3+ ions, and (3) anchoring RuO2 nanoparticles on HrGO surfaces. Solid‐state FMSCs assembled using those fibers demonstrate a specific volumetric capacitance of 199 F cm?3 at 2 mV s?1. Fabricated FMSCs also deliver an ultrahigh energy density of 27.3 mWh cm?3, the highest among those reported for FMSCs to date. Furthermore, integrating 20 pieces of FMSCs with two commercial flexible solar cells as a self‐powering energy system, a light‐emitting diode panel can be lit up stably. The current work highlights the excellent potential of nano‐RuO2‐decorated HrGO composite fibers for constructing micro‐supercapacitors with high energy density for wearable electronic devices. 相似文献
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Graphene‐Based Linear Tandem Micro‐Supercapacitors with Metal‐Free Current Collectors and High‐Voltage Output 下载免费PDF全文
Xiaoyu Shi Zhong‐Shuai Wu Jieqiong Qin Shuanghao Zheng Sen Wang Feng Zhou Chenglin Sun Xinhe Bao 《Advanced materials (Deerfield Beach, Fla.)》2017,29(44)
Printable supercapacitors are regarded as a promising class of microscale power source, but are facing challenges derived from conventional sandwich‐like geometry. Herein, the printable fabrication of new‐type planar graphene‐based linear tandem micro‐supercapacitors (LTMSs) on diverse substrates with symmetric and asymmetric configuration, high‐voltage output, tailored capacitance, and outstanding flexibility is demonstrated. The resulting graphene‐based LTMSs consisting of 10 micro‐supercapacitors (MSs) present efficient high‐voltage output of 8.0 V, suggestive of superior uniformity of the entire integrated device. Meanwhile, LTMSs possess remarkable flexibility without obvious capacitance degradation under different bending states. Moreover, areal capacitance of LTMSs can be sufficiently modulated by incorporating polyaniline‐based pseudocapacitive nanosheets into graphene electrodes, showing enhanced capacitance of 7.6 mF cm?2. To further improve the voltage output and energy density, asymmetric LTMSs are fabricated through controlled printing of linear‐patterned graphene as negative electrodes and MnO2 nanosheets as positive electrodes. Notably, the asymmetric LTMSs from three serially connected MSs are easily extended to 5.4 V, triple voltage output of the single cell (1.8 V), suggestive of the versatile applicability of this technique. Therefore, this work offers numerous opportunities of graphene and analogous nanosheets for one‐step scalable fabrication of flexible tandem energy storage devices integrating with printed electronics on same substrate. 相似文献
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Tao Cheng You‐Wei Wu Ya‐Li Chen Yi‐Zhou Zhang Wen‐Yong Lai Wei Huang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(34)
Flexible planar micro‐supercapacitors (MSCs) with unique loose and porous nanofiber‐like electrode structures are fabricated by combining electrochemical deposition with inkjet printing. Benefiting from the resulting porous nanofiber‐like structures, the areal capacitance of the inkjet‐printed flexible planar MSCs is obviously enhanced to 46.6 mF cm?2, which is among the highest values ever reported for MSCs. The complicated fabrication process is successfully averted as compared with previously reported best‐performing planar MSCs. Besides excellent electrochemical performance, the resultant MSCs also show superior mechanical flexibility. The as‐fabricated MSCs can be highly bent to 180° 1000 times with the capacitance retention still up to 86.8%. Intriguingly, because of the remarkable patterning capability of inkjet printing, various modular MSCs in serial and in parallel can be directly and facilely inkjet‐printed without using external metal interconnects and tedious procedures. As a consequence, the electrochemical performance can be largely enhanced to better meet the demands of practical applications. Additionally, flexible serial MSCs with exquisite and aesthetic patterns are also inkjet‐printed, showing great potential in fashionable wearable electronics. The results suggest a feasible strategy for the facile and cost‐effective fabrication of high‐performance flexible MSCs via inkjet printing. 相似文献
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Yongting Qiu Mingzhen Hou Jingchang Gao Haili Zhai Haimin Liu Mengmeng Jin Xiang Liu Linfei Lai 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(45)
Cost‐effective synthesis of carbon nanospheres with a desirable mesoporous network for diversified energy storage applications remains a challenge. Herein, a direct templating strategy is developed to fabricate monodispersed N‐doped mesoporous carbon nanospheres (NMCSs) with an average particle size of 100 nm, a pore diameter of 4 nm, and a specific area of 1093 m2 g?1. Hexadecyl trimethyl ammonium bromide and tetraethyl orthosilicate not only play key roles in the evolution of mesopores but also guide the assembly of phenolic resins to generate carbon nanospheres. Benefiting from the high surface area and optimum mesopore structure, NMCSs deliver a large specific capacitance up to 433 F g?1 in 1 m H2SO4. The NMCS electrodes–based symmetric sandwich supercapacitor has an output voltage of 1.4 V in polyvinyl alcohol/H2SO4 gel electrolyte and delivers an energy density of 10.9 Wh kg?1 at a power density of 14014.5 W kg?1. Notably, NMCSs can be directly applied through the mask‐assisted casting technique by a doctor blade to fabricate micro‐supercapacitors. The micro‐supercapacitors exhibit excellent mechanical flexibility, long‐term stability, and reliable power output. 相似文献
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