气候变化领域集成服务门户(CCPortal): A reduced graphene oxide/mixed-valence manganese oxide composite electrode for tailorable and surface mountable supercapacitors with high capacitance and super-long life

CCPortal

DOI	10.1039/c6ee03773a
	A reduced graphene oxide/mixed-valence manganese oxide composite electrode for tailorable and surface mountable supercapacitors with high capacitance and super-long life
	Wang Y.; Lai W.; Wang N.; Jiang Z.; Wang X.; Zou P.; Lin Z.; Fan H.J.; Kang F.; Wong C.-P.; Yang C.
发表日期	2017
ISSN	17545692
起始页码	941
结束页码	949
卷号	10 期号:4
英文摘要	Developing supercapacitor electrodes with an ultra-long cycle life and a high specific capacitance is critical to the future energy storage devices. Herein, we report a scalable synthesis technology of mixed-valence manganese oxide nanoparticles anchored to reduced graphene oxide (rGO/MnOx) as the high-performance supercapacitor electrodes. First, 2-dimensional (2D) δ-MnO2 nanosheets are formed on a graphene oxide (GO) template, which is then in situ reduced by hydrazine vapour to mixed-valence manganese oxide nanoparticles evenly distributed on a rGO conductive network. The obtained rGO/MnOx electrode material exhibits a high specific capacitance of 202 F g-1 (mass loading of 2 mg cm-2), a large areal specific capacitance of 2.5 F cm-2 (mass loading of up to 19 mg cm-2), and a super-long-life stability of 106% capacitance retention after 115 000 charge/discharge cycles. By using an ionic liquid electrolyte and an activated carbon anode, asymmetric supercapacitors (AScs) are also constructed and can be packaged into a high performance miniaturized energy storage component in either a tailorable or surface mountable configuration. Our ASc shows superior performance characteristics, with typical figures of merit including maximum energy densities of 47.9 W h kg-1 at 270 W kg-1 and 19.1 W h kg-1 at the maximum power density of 20.8 kW kg-1. The capacitance retention of the ASc is 96% after 80 000 charge/discharge cycles, which is the most excellent stability performance in an ionic liquid electrolyte as compared with the recently reported pseudo-supercapacitors. This technology may find vast applications in future miniaturized portable and wearable electronics. © The Royal Society of Chemistry 2017.
英文关键词	Activated carbon; Anodes; Capacitance; Carbon; Electrodes; Electrolytes; Electrolytic capacitors; Energy storage; Graphene; Ionic liquids; Manganese; Nanoparticles; Oxides; Supercapacitor; Synthesis (chemical); Wearable technology; Asymmetric supercapacitor; Charge/discharge cycle; Energy storage components; High specific capacitances; Ionic liquid electrolytes; Performance characteristics; Reduced graphene oxides; Supercapacitor electrodes; Manganese oxide; activated carbon; composite; electrode; electrolyte; electronic equipment; ionic liquid; manganese oxide; nanoparticle; oxide; performance assessment
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190489
作者单位	Division of Energy and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China; State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China; School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332, United States; School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
推荐引用方式 GB/T 7714	Wang Y.,Lai W.,Wang N.,et al. A reduced graphene oxide/mixed-valence manganese oxide composite electrode for tailorable and surface mountable supercapacitors with high capacitance and super-long life[J],2017,10(4).
APA	Wang Y..,Lai W..,Wang N..,Jiang Z..,Wang X..,...&Yang C..(2017).A reduced graphene oxide/mixed-valence manganese oxide composite electrode for tailorable and surface mountable supercapacitors with high capacitance and super-long life.Energy & Environmental Science,10(4).
MLA	Wang Y.,et al."A reduced graphene oxide/mixed-valence manganese oxide composite electrode for tailorable and surface mountable supercapacitors with high capacitance and super-long life".Energy & Environmental Science 10.4(2017).