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RISS 인기검색어
- 검색키워드
- 저자 : Rubloff, Gary W. (검색결과 6 건)
- 무료
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High to ultra-high power electrical energy storage
Sherrill, Stefanie A.,Banerjee, Parag,Rubloff, Gary W.,Lee, Sang Bok Royal Society of Chemistry 2011 Physical chemistry chemical physics Vol.13 No.46
<P>High power electrical energy storage systems are becoming critical devices for advanced energy storage technology. This is true in part due to their high rate capabilities and moderate energy densities which allow them to capture power efficiently from evanescent, renewable energy sources. High power systems include both electrochemical capacitors and electrostatic capacitors. These devices have fast charging and discharging rates, supplying energy within seconds or less. Recent research has focused on increasing power and energy density of the devices using advanced materials and novel architectural design. An increase in understanding of structure-property relationships in nanomaterials and interfaces and the ability to control nanostructures precisely has led to an immense improvement in the performance characteristics of these devices. In this review, we discuss the recent advances for both electrochemical and electrostatic capacitors as high power electrical energy storage systems, and propose directions and challenges for the future. We asses the opportunities in nanostructure-based high power electrical energy storage devices and include electrochemical and electrostatic capacitors for their potential to open the door to a new regime of power energy.</P> <P>Graphic Abstract</P><P>This article reviews recent advancements in electrochemical and electrostatic capacitors for high power energy storage with a focus on nanostructures and materials. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cp22659b'> </P>
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Nanotubular metal-insulator-metal capacitor arrays for energy storage
Banerjee, Parag,Perez, Israel,Henn-Lecordier, Laurent,Lee, Sang Bok,Rubloff, Gary W. Springer Science and Business Media LLC 2009 Nature nanotechnology Vol.4 No.5
<P>Nanostructured devices have the potential to serve as the basis for next-generation energy systems that make use of densely packed interfaces and thin films. One approach to making such devices is to build multilayer structures of large area inside the open volume of a nanostructured template. Here, we report the use of atomic layer deposition to fabricate arrays of metal-insulator-metal nanocapacitors in anodic aluminium oxide nanopores. These highly regular arrays have a capacitance per unit planar area of approximately 10 microF cm-2 for 1-microm-thick anodic aluminium oxide and approximately 100 microF cm-2 for 10-microm-thick anodic aluminium oxide, significantly exceeding previously reported values for metal-insulator-metal capacitors in porous templates. It should be possible to scale devices fabricated with this approach to make viable energy storage systems that provide both high energy density and high power density.</P>
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MnO<sub>2</sub>/TiN heterogeneous nanostructure design for electrochemical energy storage
Sherrill, Stefanie A.,Duay, Jonathon,Gui, Zhe,Banerjee, Parag,Rubloff, Gary W.,Lee, Sang Bok Royal Society of Chemistry 2011 Physical chemistry chemical physics Vol.13 No.33
<P>MnO<SUB>2</SUB>/TiN nanotubes are fabricated using facile deposition techniques to maximize the surface area of the electroactive material for use in electrochemical capacitors. Atomic layer deposition is used to deposit conformal nanotubes within an anodic aluminium oxide template. After template removal, the inner and outer surfaces of the TiN nanotubes are exposed for electrochemical deposition of manganese oxide. Electron microscopy shows that the MnO<SUB>2</SUB> is deposited on both the inside and outside of TiN nanotubes, forming the MnO<SUB>2</SUB>/TiN nanotubes. Cyclic voltammetry and galvanostatic charge–discharge curves are used to characterize the electrochemical properties of the MnO<SUB>2</SUB>/TiN nanotubes. Due to the close proximity of MnO<SUB>2</SUB> with the highly conductive TiN as well as the overall high surface area, the nanotubes show very high specific capacitance (662 F g<SUP>−1</SUP> reported at 45 A g<SUP>−1</SUP>) as a supercapacitor electrode material. The highly conductive and mechanically stable TiN greatly enhances the flow of electrons to the MnO<SUB>2</SUB> material, while the high aspect ratio nanostructure of TiN creates a large surface area for short diffusion paths for cations thus improving high power. Combining the favourable structural, electrical and energy properties of MnO<SUB>2</SUB> and TiN into one system allows for a promising electrode material for supercapacitors.</P> <P>Graphic Abstract</P><P>Atomic layer deposition and electrochemical deposition are combined to fabricate MnO<SUB>2</SUB>/TiN heterogeneous nanostructures for electrochemical energy storage. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cp21815h'> </P>
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Profile Evolution for Conformal Atomic Layer Deposition over Nanotopography
Cleveland, Erin R.,Banerjee, Parag,Perez, Israel,Lee, Sang Bok,Rubloff, Gary W. American Chemical Society 2010 ACS NANO Vol.4 No.8
<P>The self-limiting reactions which distinguish atomic layer deposition (ALD) provide ultrathin film deposition with superb conformality over the most challenging topography. This work addresses how the shapes (<I>i.e.</I>, surface profiles) of nanostructures are modified by the conformality of ALD. As a nanostructure template, we employ a highly scalloped surface formed during the first anodization of the porous anodic alumina (PAA) process, followed by removal of the alumina to expose a scalloped Al surface. SEM and AFM reveal evolution of surface profiles that change with ALD layer thickness, influenced by the way ALD conformality decorates the underlying topography. The evolution of surface profiles is modeled using a simple geometric 3D extrusion model, which replicates the measured complex surface topography. Excellent agreement is obtained between experimental data and the results from this model, suggesting that for this ALD system conformality is very high even on highly structured, sharp features of the initial template surface. Through modeling and experimentation, the benefits of ALD to manipulate complex surface topographies are recognized and will play an important role in the design and nanofabrication of next generation devices with increasingly high aspect ratios as well as nanoscale features.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-8/nn1009984/production/images/medium/nn-2010-009984_0009.gif'></P>
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