scholarly journals Rational design of quinones for high power density biofuel cells

2015 ◽  
Vol 6 (8) ◽  
pp. 4867-4875 ◽  
Author(s):  
Ross D. Milton ◽  
David P. Hickey ◽  
Sofiene Abdellaoui ◽  
Koun Lim ◽  
Fei Wu ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
Rational Design ◽  
Biofuel Cells ◽  
High Power Density ◽  
Power Densities

Rationally designing quinones to label GDH and create a redox hydrogel that delivers high OCP, current and power densities.

scholarly journals Near-field thermophotovoltaics for efficient heat to electricity conversion at high power density

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rohith Mittapally ◽  
Byungjun Lee ◽  
Linxiao Zhu ◽  
Amin Reihani ◽  
Ju Won Lim ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Efficiency ◽  
Near Field ◽  
Electrical Power ◽  
Photovoltaic Cells ◽  
High Power Density ◽  
Pv Cell ◽  
Electrical Power Output ◽  
Power Densities

AbstractThermophotovoltaic approaches that take advantage of near-field evanescent modes are being actively explored due to their potential for high-power density and high-efficiency energy conversion. However, progress towards functional near-field thermophotovoltaic devices has been limited by challenges in creating thermally robust planar emitters and photovoltaic cells designed for near-field thermal radiation. Here, we demonstrate record power densities of ~5 kW/m2 at an efficiency of 6.8%, where the efficiency of the system is defined as the ratio of the electrical power output of the PV cell to the radiative heat transfer from the emitter to the PV cell. This was accomplished by developing novel emitter devices that can sustain temperatures as high as 1270 K and positioning them into the near-field (<100 nm) of custom-fabricated InGaAs-based thin film photovoltaic cells. In addition to demonstrating efficient heat-to-electricity conversion at high power density, we report the performance of thermophotovoltaic devices across a range of emitter temperatures (~800 K–1270 K) and gap sizes (70 nm–7 µm). The methods and insights achieved in this work represent a critical step towards understanding the fundamental principles of harvesting thermal energy in the near-field.

scholarly journals Hierarchical Carbon Microtube@Nanotube Core–Shell Structure for High-Performance Oxygen Electrocatalysis and Zn–Air Battery

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenfu Xie ◽  
Jianming Li ◽  
Yuke Song ◽  
Shijin Li ◽  
Jianbo Li ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
High Power ◽  
High Performance ◽  
Rational Design ◽  
Specific Capacity ◽  
High Mass ◽  
Core Shell ◽  
High Power Density ◽  
Mass Loading

AbstractZinc–air batteries (ZABs) hold tremendous promise for clean and efficient energy storage with the merits of high theoretical energy density and environmental friendliness. However, the performance of practical ZABs is still unsatisfactory because of the inevitably decreased activity of electrocatalysts when assembly into a thick electrode with high mass loading. Herein, we report a hierarchical electrocatalyst based on carbon microtube@nanotube core–shell nanostructure (CMT@CNT), which demonstrates superior electrocatalytic activity for oxygen reduction reaction and oxygen evolution reaction with a small potential gap of 0.678 V. Remarkably, when being employed as air–cathode in ZAB, the CMT@CNT presents an excellent performance with a high power density (160.6 mW cm−2), specific capacity (781.7 mAhg Zn −1 ) as well as long cycle stability (117 h, 351 cycles). Moreover, the ZAB performance of CMT@CNT is maintained well even under high mass loading (3 mg cm−2, three times as much as traditional usage), which could afford high power density and energy density for advanced electronic equipment. We believe that this work is promising for the rational design of hierarchical structured electrocatalysts for advanced metal-air batteries.

High Power-Density SiC Converter

2008 ◽  
Vol 600-603 ◽  
pp. 1223-1226 ◽  
Author(s):  
Shin Ichi Kinouchi ◽  
Hiroshi Nakatake ◽  
T. Kitamura ◽  
S. Azuma ◽  
S. Tominaga ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
Power Loss ◽  
Cooling System ◽  
High Power Density ◽  
Loss Reduction ◽  
Effective Volume ◽  
Similar Rating ◽  
Power Densities ◽  
System Volume

A compact SiC converter having power densities about 9 W/cm3 is designed and fabricated. It is confirmed that the converter operates in a thermally permissive range. The power loss of the module of the converter measured under motor operations is less than 50% of the similar-rating Si module loss. The shrink of the effective volume of DC-link capacitor is necessary to achieve the high power-density SiC converter, in addition to the decrease of the cooling system volume due to the loss reduction caused by SiC devices.

High Power-Density 4H-SiC RF MOSFETs

2006 ◽  
Vol 527-529 ◽  
pp. 1277-1280 ◽  
Author(s):  
G. Gudjónsson ◽  
Fredrik Allerstam ◽  
H.Ö. Ólafsson ◽  
Per Åke Nilsson ◽  
Hans Hjelmgren ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
Cutoff Frequency ◽  
Double Gate ◽  
High Power Density ◽  
Rf Power ◽  
Drain Voltage ◽  
Power Mosfets ◽  
First Time ◽  
Power Densities

We have made a 4H-SiC RF power MOSFETs with cutoff frequency up to 12 GHz, delivering RF power of 1.9 W/mm at 3 GHz. The transistors withstand 200 V drain voltage, are normally-off, and show no gate lag, which is often encountered in SiC MESFETs. The measured devices have a single drain finger and a double gate finger and a total gate width of 0.8 mm. To our knowledge this is the first time that power densities above 1 W/mm at 3 GHz are reported for SiC MOSFETs.

Soft, stretchable, high power density electronic skin-based biofuel cells for scavenging energy from human sweat

2017 ◽  
Vol 10 (7) ◽  
pp. 1581-1589 ◽  
Author(s):  
Amay J. Bandodkar ◽  
Jung-Min You ◽  
Nam-Heon Kim ◽  
Yue Gu ◽  
Rajan Kumar ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
Biofuel Cells ◽  
Biofuel Cell ◽  
High Power Density ◽  
Human Sweat ◽  
Electronic Skin

A soft, stretchable wearable biofuel cell producing ∼1 mW power from sweat is presented.

Welding with high brilliance lasers and high power density

2010 ◽  
Author(s):  
Andreas Patschger ◽  
Markus Franz ◽  
Jens Bliedtner ◽  
Jean Pierre Bergmann
Keyword(s):  
Power Density ◽  
High Power ◽  
High Power Density
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