Topic
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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TL;DR: In this article, the authors developed a facile synchronization strategy to prepare a N-doped and oxygen vacancy-rich NiCo2O4 microporous nanograss (N-Ov-NCO MiNG), with adjustable superficial nanoporous architecture and electronic structure.
83 citations
TL;DR: In this article, a one-dimensional heat conduction problem was solved to obtain a correlation among melt depth, power density, and laser irradiation time, based on this correlation, the dynamics of melting, a relationship between the melt depth and power density and an average melting velocity were expressed by simple analytic formulas.
Abstract: Melting is encountered in almost all laser materials processing. This article deals with a one-dimensional heat conduction problem to investigate the melting rate during laser materials processing. The problem is solved approximately to obtain a correlation among melt depth, power density, and laser irradiation time. Based on this correlation, the dynamics of melting, a relationship between the melt depth and power density and an average melting velocity are expressed by simple analytic formulas. These expressions are further simplified for high power densities (I⩾109 W/m2). The times to reach the melting and boiling temperatures at the surface of the workpiece are also calculated.
83 citations
TL;DR: In this article, uniform nanosheet-based carambola-like Ni@Ni.5Co1.5S2 was successfully synthesized and assembled into an asymmetric supercapacitor device with a high specific capacitance of 109 F g −1 at a current density of 1 A g−1.
Abstract: Studies on supercapacitor devices constitute one of the most meaningful research topics in hastening the industrialization of electrode materials. Herein, uniform nanosheet-based carambola-like Ni@Ni1.5Co1.5S2 was successfully synthesized and assembled into an asymmetric supercapacitor device with a high specific capacitance of 109 F g–1 at a current density of 1 A g–1. The large mass loading of this device, at ∼20 mg cm–2, is compatible with the industry standard and considerably higher than those obtained in previous reports. The Ni@Ni1.5Co1.5S2-based supercapacitor device exhibited excellent cycling stability with virtually no decrease in capacitance after 2000 cycles, and achieved a high energy density of 65.7 W h kg–1 at a power density of 22.2 W kg–1 and a high power density of 3 kW kg–1 at energy density of 6.2 W h kg–1. These outstanding characteristics of Ni@Ni1.5Co1.5S2 as an electrode material for supercapacitor devices verify its promising applicability in the energy storage field.
83 citations
TL;DR: In this paper, a low-cost, one-mask technique is used to fabricate planar coils and the planar spring, which can provide an alternative for processes such as lithographie galvanoformung abformung (LIGA), SU-8 molding and MEMS electroplating.
Abstract: This paper presents the modeling, simulation, fabrication and experimental results of a vibration-based electromagnetic power generator (EMPG). A novel, low-cost, one-mask technique is used to fabricate the planar coils and the planar spring. This fabrication technique can provide an alternative for processes such as lithographie galvanoformung abformung (LIGA) or SU-8 molding and MEMS electroplating. Commercially available copper foils of 20 µm and 350 µm thicknesses are used for the planar coils and planar spring, respectively. The design with planar coils on either side of the magnets provides enhanced power generation for the same footprint of the device. The harvester's overall volume is 1 cm3. Excitation of the EMPG, at the fundamental frequency of 371 Hz, base acceleration of 13.5 g and base amplitude of 24.4 µm, yields an open circuit voltage of 60.1 mV, as well as 46.3 mV load voltage and 10.7 µW power for a 100 Ω load resistance. At a matching impedance of 7.5 Ω the device produced a maximum power of 23.56 µW and a power density of 23.56 µW cm−3. The simulations based on the analytical model of the device show good agreement with the experimental results.
83 citations
TL;DR: This study highlights an ultrahigh-power-density Zn-air fuel cell with robust stability that shows the best stability under high-current-density discharging and superior power density compared to most reported non-noble-metal electrocatalysts.
Abstract: Metal-air fuel cells with high energy density, eco-friendliness, and low cost bring significantly high security to future power systems. However, the impending challenges of low power density and high-current-density stability limit their widespread applications. In this study, an ultrahigh-power-density Zn-air fuel cell with robust stability is highlighted. Benefiting from the water-resistance effect of the confined nanopores, the highly active cobalt cluster electrocatalysts reside in specific nanopores and possess stable triple-phase reaction areas, leading to the synergistic optimization of electron conduction, oxygen gas diffusion, and ion transport for electrocatalysis. As a result, the as-established Zn-air fuel cell shows the best stability under high-current-density discharging (>90 h at 100 mA cm-2 ) and superior power density (peak power density: >300 mW cm-2 , specific power: 500 Wgcat -1 ) compared to most reported non-noble-metal electrocatalysts. The findings will provide new insights in the rational design of electrocatalysts for advanced metal-air fuel cell systems.
83 citations