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Miniaturized Supercapacitors: Focused Ion Beam Reduced Graphene Oxide Supercapacitors with Enhanced Performance Metrics 下载免费PDF全文
Derrek E. Lobo Parama Chakraborty Banerjee Christopher D. Easton Mainak Majumder 《Liver Transplantation》2015,5(19)
Miniaturization of energy storage devices with enhanced performance metrics can reduce the footprint of microdevices being used in our daily life. Micro‐supercapacitor architectures with planar geometry provides several advantages, such as, the ability to control and reduce the distances ions travel between two electrodes, easy integration to microdevices, and offer the potential of being extended into 3D without compromising the interelectrode distances. Here, focused ion beam (FIB) technology is used to directly write miniaturized planar electrode systems of reduced graphene oxide (FIB‐rGO) on films of graphene oxide. Using optimized ion beam irradiation, interdigitated FIB‐rGO electrode designs with 40 μm long and 3.5 μm wide fingers with ultrasmall interelectrode spacing of 1 μm demonstrate a large capacitance (102 mF cm?2), ultrasmall time response (0.03 ms), low equivalent series resistance (0.35 mΩ cm2), and retain 95% of the capacitance after 1000 cycles at an ultrahigh current density of 45 mA cm?2. These performance metrics show remarkable improvements on several counts of supercapacitor performance over existing reports due to the miniaturized electrode dimensions and minimal damage to the graphene sheets. It is believed that these results can provide avenues for large‐scale fabrication of arrayed, planar, high‐performance micro‐supercapacitors with a small environmental footprint. 相似文献
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Lithium‐ion capacitors (LICs) with capacitor‐type cathodes and battery‐type anodes are considered a promising next‐generation advanced energy storages system that meet the requirements of high energy density and power density. However, the mismatch of charge‐storage capacity and electrode kinetics between positive and negative electrodes remains a challenge. Herein, layered SnS2/reduced graphene oxide (RGO) nanocomposites are developed for negative electrodes and a 2D B/N codoped carbon (BCN) nanosheet is designed for the positive electrode. The SnS2/RGO derived from SnS2‐bonded RGO of high conductivity exhibits a capacity of 1198 mA h g?1 at 100 mA g?1. Boron and nitrogen atoms in BCN are found to promote adsorption of anions, which enhance the pseudocapacitive contribution as well as expanding the voltage of LICs. A quantitative kinetics analysis indicates that the SnS2/RGO electrodes with a dominating capacitive mechanism and a diminished intercalation process, benefit the kinetic balance between the two electrodes. With this particular structure, the LIC is able to operate at the highest operating voltage for these devices recorded to date (4.5 V), exhibiting an energy density of 149.5 W h kg?1, a power density of 35 kW kg?1, and a capacity retention ratio of 90% after 10 000 cycles. 相似文献
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Jin Zhao Yi‐Zhou Zhang Fan Zhang Hanfeng Liang Fangwang Ming Husam N. Alshareef Zhiqiang Gao 《Liver Transplantation》2019,9(7)
The current Na+ storage performance of carbon‐based materials is still hindered by the sluggish Na+ ion transfer kinetics and low capacity. Graphene and its derivatives have been widely investigated as electrode materials in energy storage and conversion systems. However, as anode materials for sodium‐ion batteries (SIBs), the severe π–π restacking of graphene sheets usually results in compact structure with a small interlayer distance and a long ion transfer distance, thus leading to low capacity and poor rate capability. Herein, partially reduced holey graphene oxide is prepared by simple H2O2 treatment and subsequent low temperature reduction of graphene oxide, leading to large interlayer distance (0.434 nm), fast ion transport, and larger Na+ storage space. The partially remaining oxygenous groups can also contribute to the capacity by redox reaction. As anode material for SIBs, the optimized electrode delivers high reversible capacity, high rate capability (365 and 131 mAh g?1 at 0.1 and 10 A g?1, respectively), and good cycling performance (163 mAh g?1 after 3000 cycles at a current density of 2 A g?1), which is among the best reported performances for carbon‐based SIB anodes. 相似文献
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Supercapacitors: Large‐Scale Conductive Yarns Based on Twistable Korean Traditional Paper (Hanji) for Supercapacitor Applications: Toward High‐Performance Paper Supercapacitors (Adv. Energy Mater. 27/2018) 下载免费PDF全文
Young‐Jung Heo Ji Won Lee Yeong‐Rae Son Jong‐Hoon Lee Chang Su Yeo Tran Dai Lam Sang Yoon Park Soo‐Jin Park Le Hoang Sinh Min Kyoon Shin 《Liver Transplantation》2018,8(27)
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Batteries: An Operando Mechanistic Evaluation of a Solar‐Rechargeable Sodium‐Ion Intercalation Battery (Adv. Energy Mater. 19/2017) 下载免费PDF全文
Shi Nee Lou Neeraj Sharma Damian Goonetilleke Wibawa Hendra Saputera Thomas M. Leoni Paul Brockbank Sean Lim Da‐Wei Wang Jason Scott Rose Amal Yun Hau Ng 《Liver Transplantation》2017,7(19)
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Electrochemical Energy Storage: Ordered Network of Interconnected SnO2 Nanoparticles for Excellent Lithium‐Ion Storage (Adv. Energy Mater. 5/2015) 下载免费PDF全文
Vinodkumar Etacheri Gulaim A. Seisenbaeva James Caruthers Geoffrey Daniel Jean‐Marie Nedelec Vadim G. Kessler Vilas G. Pol 《Liver Transplantation》2015,5(5)
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Graphene Nanoribbons: Nitrogen‐Doped Graphene Nanoribbons with Surface Enriched Active Sites and Enhanced Performance for Dye‐Sensitized Solar Cells (Adv. Energy Mater. 11/2015) 下载免费PDF全文
Xiangtong Meng Chang Yu Xuedan Song Yang Liu Suxia Liang Zhiqiang Liu Ce Hao Jieshan Qiu 《Liver Transplantation》2015,5(11)
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Lyophilized 3D Lithium Vanadium Phosphate/Reduced Graphene Oxide Electrodes for Super Stable Lithium Ion Batteries 下载免费PDF全文
3D lithium vanadium phosphate/reduced graphene oxide porous structures are prepared using a facile lyophilization process. The 3D porous nature of these lyophilized electrodes along with their high surface area lead to high rate capability and specific capacity. A high specific discharge capacity of ≈192 mAh g?1 is observed at 0.5 C. The cycling performance is noteworthy, as these lyophilized samples at 0.5 and 1 C do not show any fading, even after 1000 and 5000 cycles, respectively. Capacity retention of ≈96.2% is observed at the end of 10 000 cycles at 20 C. This remarkable cycling performance is attributed to the structural stability of the 3D porous network and is confirmed using scanning electron microscopy and selected area electron diffraction after 10 000 cycles of consecutive charging and discharging at 20 C. 相似文献
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Sodium Ion Batteries: 3D Graphene Decorated NaTi2(PO4)3 Microspheres as a Superior High‐Rate and Ultracycle‐Stable Anode Material for Sodium Ion Batteries (Adv. Energy Mater. 19/2016) 下载免费PDF全文
Yongjin Fang Lifen Xiao Jiangfeng Qian Yuliang Cao Xinping Ai Yunhui Huang Hanxi Yang 《Liver Transplantation》2016,6(19)