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Superior pseudocapacitive storage of a Novel Ni3Si2/ NiOOH/Graphene Nanostructure for an All‑Solid‑State Supercapacitor

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Nano-Micro Letters 2021年第1期13卷 15-28页

作者： Jing Ning Maoyang Xia Dong Wang Xin Feng Hong Zhou Jincheng Zhang Yue Hao The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Xidian UniversityXi’an 710071People’s Republic of China Shaanxi Joint Key Laboratory of Graphene Xidian UniversityXi’an 710071People’s Republic of China

Recent developments in the synthesis of graphene-based structures focus on continuous improvement of porous nanostructures,doping of thin films,and mechanisms for the construction of threedimensional ***,we synthesize creeper-like Ni3Si2/NiOOH/graphene nanostructures via low-pressure all-solid meltingreconstruction chemical vapor *** a carbon-rich atmosphere,high-energy atoms bombard the Ni and Si surface,and reduce the free energy in the thermodynamic equilibrium of solid Ni–Si particles,considerably catalyzing the growth of Ni–Si *** controlling the carbon source content,a Ni3Si2 single crystal with high crystallinity and good homogeneity is stably *** measurements indicate that the nanostructures exhibit an ultrahigh specific capacity of 835.3 C g^−1(1193.28 F g^−1)at 1 A g^−1;when integrated as an all-solidstate supercapacitor,it provides a remarkable energy density as high as 25.9 Wh kg^−1 at 750 W kg^−1,which can be attributed to the freestanding Ni3Si2/graphene skeleton providing a large specific area and NiOOH inhibits insulation on the electrode surface in an alkaline solution,thereby accelerating the electron exchange *** growth of the high-performance composite nanostructure is simple and controllable,enabling the large-scale production and application of microenergy storage devices.

关键词： pseudocapacitive storage Creeper-like Ni3Si2 NiOOH Graphene All-solid-state supercapacitors

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An in-situ self-etching enabled high-power electrode for aqueous zinc-ion batteries

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Journal of Energy Chemistry 2024年第1期88卷 399-408,I0009页

作者： Shuang Hou Dingtao Ma Yanyi Wang Kefeng Ouyang Sicheng Shen Hongwei Mi Lingzhi Zhao Peixin Zhang College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina Guangdong Provincial Engineering Technology Research Center for Low Carbon and Advanced Energy Materials School of Semiconductor Science and TechnologySouth China Normal UniversityFoshan 528225GuangdongChina SCNU Qingyuan Institute of Science and Technology Innovation Co. Ltd.Qingyuan 511517GuangdongChina

Sluggish storage kinetics is considered as the main bottleneck of cathode materials for fast-charging aqueous zinc-ion batteries(AZIBs).In this report,we propose a novel in-situ self-etching strategy to unlock the Palm tree-like vanadium oxide/carbon nanofiber membrane(P-VO/C)as a robust freestanding *** investigations including the finite element simulation,in-situ X-ray diffraction,and in-situ electrochemical impedance spectroscopy disclosed it an electrochemically induced phase transformation mechanism from VO to layered Zn_(x)V_(2)O_5·nH_(2)O,as well as superior storage kinetics with ultrahigh pseudocapacitive *** demonstrated,such electrode can remain a specific capacity of 285 mA h g^(-1)after 100 cycles at 1 A g^(-1),144.4 mA h g^(-1)after 1500 cycles at 30 A g^(-1),and even 97 mA h g^(-1)after 3000 cycles at 60 A g^(-1),***,an impressive power density of 78.9 kW kg^(-1)at the super-high current density of 100 A g^(-1)also can be *** design concept of in-situ self-etching free-standing electrode can provide a brand-new insight into extending the pseudocapacitive storage limit,so as to promote the development of high-power energy storage devices including but not limited to AZIBs.

关键词： In-situ self-etching Free-standing electrode pseudocapacitive storage High-power Zinc-ion batteries

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