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Power density

About: Power density is a research topic. Over the lifetime, 9534 publications have been published within this topic receiving 197264 citations. The topic is also known as: volumic power & volume power density.


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Journal ArticleDOI
TL;DR: A three dimensional porous framework-like N-doped carbon (PFNC) with a high specific surface area was successfully fabricated through ammonia doping and graphitization based on pomelo peel and exhibits an enhanced specific capacitance and superior cycling performance.
Abstract: A three dimensional (3D) porous framework-like N-doped carbon (PFNC) with a high specific surface area was successfully fabricated through ammonia doping and graphitization based on pomelo peel. The obtained PFNC exhibits an enhanced specific capacitance (260 F g–1 at 1 A g–1) and superior cycling performance (capacitance retention of 84.2% after 10000 cycles at 10 A g–1) on account of numerous voids and pores which supply sufficient pathways for ion diffusion during cycling. Furthermore, a fabricated asymmetric PFNC//PFN device based on PFNC and porous flake-like NiO (PFN) arrays achieves a specific capacitance of 88.8 F g–1 at 0.4 A g–1 and an energy density of 27.75 Wh kg–1 at a power density of 300 W kg–1 and still retains 44 F g–1 at 10 A g–1 and 13.75 Wh kg–1 at power density of 7500 W kg–1. It is important that the device is able to supply two light-emitting diodes for 25 min, which demonstrates great application potential.

102 citations

Journal ArticleDOI
TL;DR: It is demonstrated that, as a result of harvesting energy from both electrochemical neutralization and electrochemical Zn oxidation, the as-developed hybrid cell can deliver a power density of up to 80 mW cm-2 and an energy density of 934 Wh kg-1 and maintain long-term stability for H2 production with an output voltage of 1.16 V.
Abstract: An alkaline-acid Zn-H2 O fuel cell is proposed for the simultaneous generation of electricity with an open circuit voltage of about 1.25 V and production of H2 with almost 100 % Faradic efficiency. We demonstrate that, as a result of harvesting energy from both electrochemical neutralization and electrochemical Zn oxidation, the as-developed hybrid cell can deliver a power density of up to 80 mW cm-2 and an energy density of 934 Wh kg-1 and maintain long-term stability for H2 production with an output voltage of 1.16 V at a current density of 10 mA cm-2 .

102 citations

Journal ArticleDOI
TL;DR: In this article, a symmetric Na-ion pseudocapacitor with a power density exceeding 5.4 kW kg−1 at 11.7 A g−1, a cycling life retention of 64.5% after 10 000 cycles at 1.17 A g −1, and an energy density of 26 Wh kg− 1 at 0.585 Ag−1 is reported.
Abstract: Batteries and supercapacitors are critical devices for electrical energy storage with wide applications from portable electronics to transportation and grid. However, rechargeable batteries are typically limited in power density, while supercapacitors suffer low energy density. Here, a novel symmetric Na-ion pseudocapacitor with a power density exceeding 5.4 kW kg−1 at 11.7 A g−1, a cycling life retention of 64.5% after 10 000 cycles at 1.17 A g−1, and an energy density of 26 Wh kg−1 at 0.585 A g−1 is reported. Such a device operates on redox reactions occurring on both electrodes with an identical active material, viz., Na3V2(PO4)3 encapsulated inside nanoporous carbon. This device, in a full-cell scale utilizing highly reversible and high-rate Na-ion intercalational pseudocapacitance, can bridge the performance gap between batteries and supercapacitors. The characteristics of the device and the potentially low-cost production make it attractive for hybrid electric vehicles and low-maintenance energy storage systems.

102 citations

Journal ArticleDOI
24 Jul 2004-Langmuir
TL;DR: The fabrication and performance of a passive, microfluidics-based H2-O2 microfluidity fuel cell using thin film Pt electrodes embedded in a poly(dimethylsiloxane) (PDMS) device is described.
Abstract: We describe the fabrication and performance of a passive, microfluidics-based H2-O2 microfluidic fuel cell using thin film Pt electrodes embedded in a poly(dimethylsiloxane) (PDMS) device. The electrode array is fully immersed in a liquid electrolyte confined inside the microchannel network, which serves also as a thin gas-permeable membrane through which the reactants are fed to the electrodes. The cell operates at room temperature with a maximum power density of around 700 microW/cm(2), while its performance, as recorded by monitoring the corresponding polarization curves and the power density plots, is affected by the pH of the electrolyte, its concentration, the surface area of the Pt electrodes, and the thickness of the PDMS membrane. The best results were obtained in basic solutions using electrochemically roughened Pt electrodes, the roughness factor, R(f), of which was around 90 relative to a smooth Pt film. In addition, the operating lifetime of the fuel cell was found to be longer for the one using higher surface area electrodes.

102 citations

Journal ArticleDOI
TL;DR: In this paper, O3 antiferroelectric (AFE) bulk ceramics with both excellent energy storage and release properties were fabricated via the solid-state reaction method.
Abstract: Pb0.94La0.04[(Zr0.70Sn0.30)0.90Ti0.10]O3 antiferroelectric (AFE) bulk ceramics with both excellent energy storage and release properties were fabricated via the solid-state reaction method. The ceramics exhibited a high releasable energy density of 1.39 J/cm3, high efficiency of 92%, and good temperature stability under 104 kV/cm. Fast discharge current was measured, and a large current density up to 820 A/cm2 was achieved. The nonlinear dielectric behavior resulted in the variation of the discharge period of AFE ceramics. The stored charge was released completely due to the low remanent polarization, and the actually released energy density was about 1.0 J/cm3 in 400 ns. A high peak power density of 6.4 × 109 W/kg without a load resistor and an average power density of 3.16 × 108 W/kg with a 204.7 Ω load resistor were achieved in the rapid discharge process. The excellent energy storage and release properties indicate that the obtained antiferroelectric bulk ceramics are very promising for submicrosecond...

101 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023652
20221,294
2021519
2020594
2019595
2018600