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Activated carbon clothes for wide-voltage high-energy-density aqueous symmetric supercapacitors

Chinese Chemical Letters 2020年第6期31卷 1620-1624页

作者： Kwadwo Asare Owusu Zhaoyang Wang Longbing Qu Zi'ang Liu Jaafar Abdul-Aziz Mehrez Qiulong Wei Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Mechanical Engineering The University of MelbourneParkvilleVIC 3010Australia Department of Materials Science and Engineering University of California Los AngelesCA 90095-1595USA

Commercial carbon clothes have the potential to be utilized as supercapacitor electrodes due to their low cost and high ***,the negligible surface area of the carbon clothes serves as a serious impediment to their ***,we report a facile calcination activation method for carbon cloths to realize remarkable comprehensive electrochemical *** activated carbon cloths deliver a high areal capacitance(1700 mF/cm^2),good rate capability,and stable cycling performance up to 20,000 *** to the stability in the wide potential window,a designed symmetric capacitor can function in a cell voltage of 2.0 V and delivers high volumetric and gravimetric energy densities of 7.62 mWh/cm^3 and 18.2 Wh/kg,*** remarkable electrochemical performance is attributed to rich microporosity with high surface area,superior electrolyte wettability,and stability in wide potential window.

关键词： Activated carbon cloth Microporosity Aqueous symmetric supercapacitors Energy density voltage window

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Enabling 2.4-V aqueous supercapacitors through the rational design of an integrated electrode of hollow vanadium trioxide/carbon nanospheres

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Science China Materials 2021年第9期64卷 2163-2172页

作者： Kaiyang Zhang Yingchun Lin Lingfang Chen Jun Huang Li Wang Mengke Peng Xiannong Tang Ting Hu Kai Yuan Yiwang Chen Institute of Polymers and Energy Chemistry(IPEC) College of ChemistryNanchang UniversityNanchang 330031China School of Materials Science and Engineering Nanchang UniversityNanchang 330031China Institute of Advanced Scientific Research(iASR) Jiangxi Normal UniversityNanchang 330022China

Aqueous supercapacitors(SCs)exhibit several advantages,including high-power density,cycling durability,and safety;however,the shortage of low energy density inhibits their further *** an excellent performance upon using simple strategies would be beneficial,but remains ***,an integrated electrode of hollow V_(2)O_(3)/carbon nanospheres(H-V_(2)O_(3)/C)was designed and synthesized for *** introduction of carbon can increase the conductivity and stability,whereas the hollow structure endows H-V_(2)O_(3)/C with a high specific surface area and rapid transport of ***,the H-V_(2)O_(3)/C integrated electrode can simultaneously work in both negative and positive potential *** from these advantages,the H-V_(2)O_(3)/C integrated electrode exhibits a specific capacitance as high as 708.6 F g^(-1) in a wide voltage window of-1.1-1.3 ***,stemming from the multiple energy storage mechanisms,the aqueous integrated full SC device exhibits a wider potential window and higher energy density than the traditional(a)symmetric ***,the proposed device delivers a wide voltage window of 2.4 V with an energy density of 96.8 W h kg^(-1) at a power density of 1204.6 W kg^(-1),as well as superior cycling *** study enlightens the design and preparation of electrode materials,opening up a possible approach for developing wide-voltage aqueous SCs.

关键词： hollow nanosphere integrated electrode supercapacitor voltage window energy density

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