Important Considerations in Plasmon-Enhanced Electrochemical Conversion at Voltage-Biased Electrodes.

In this perspective we compare plasmon-enhanced electrochemical conversion (PEEC) with photoelectrochemistry (PEC). PEEC is the oxidation or reduction of a reactant at the illuminated surface of a plasmonic metal (or other conductive material) while a potential bias is applied. PEC uses solar light to generate photoexcited electron-hole pairs to drive an electrochemical reaction at a biased or unbiased semiconductor photoelectrode. The mechanism of photoexcitation of charge carriers is different between PEEC and PEC. Here we explore how this difference affects the response of PEEC and PEC systems to changes in light, temperature, and surface morphology of the photoelectrode

Space Laser Power Transmission System Studies

Power transmission by laser technique is addressed. Space to Earth and space to space configurations are considered

SOLAR POWERED ADSORPTION COOLING SYSTEM USING ACTIVATED MEDIA FOR EQUATORIAL HUMID CLIMATE

Starting from the project background to its problem statement and objective, the writer explored and explained the basic theoretical information behind the topic aborted in this project (solar adsorption cooling system using activated media for equatorial humid climate), as well as the methodology to be used in order to accomplish the desired output. This project is about designing a solar powered adsorption cooling system that fits the needs and cooling requirements of a typical house under the equatorial humid climate. Kuala Lumpur, Malaysia was chosen and all the relevant data concerning the design of the refrigeration system shall take into account its climate properties. A few adsorbent candidates were compared using relevant criteria that suits for this current application, and final choice was the activated carbon for presenting better results among the other adsorbents. The same was done to select adsorbates and the final choice was the refrigerant R600 (N-butane). Adsorption analysis on this pair was done following the ideal cycle and based on the calculations and results obtained, could be noticed that the SCE of the system can go up to 27 KJ/Kg while the COP up to 0.169 (Optimum value). Under these results could be concluded that this system is capable to keep up with the house cooling load demand which presents a value of 6.03 KW

TechNews digests: Jan - Nov 2008

TechNews is a technology, news and analysis service aimed at anyone in the education sector keen to stay informed about technology developments, trends and issues. TechNews focuses on emerging technologies and other technology news. TechNews service : digests september 2004 till May 2010 Analysis pieces and News combined publish every 2 to 3 month

Solar adsorption cooling system using activated media for equatorial humid climate

Starting from the project background to its problem statement and objective, the writer explored and explained the basic theoretical information behind the topic aborted in this project (solar adsorption cooling system using activated media for equatorial humid climate), as well as the methodology to be used in order to accomplish the desired output. This project is about designing a solar powered adsorption cooling system that fits the needs and cooling requirements of a typical house under the equatorial humid climate. Kuala Lumpur, Malaysia was chosen and all the relevant data concerning the design of the refrigeration system shall take into account its climate properties. A few adsorbent candidates were compared using relevant criteria that suits for this current application, and final choice was the activated carbon for presenting better results among the other adsorbents. The same was done to select adsorbates and the final choice was the refrigerant R600 (N-butane). Adsorption analysis on this pair was done following the ideal cycle and based on the calculatious and results obtained, could be noticed that the SCE of the system can go up to 27 KJ/Kg while the COP up to 0.169 (Optimum value). Under these results could be concluded that this system is capable to keep up with the house cooling load demand which presents a value of 6.03 KW

Understanding macroscale functionality of metal halide perovskites in terms of nanoscale heterogeneities

Hybrid metal halide perovskites have shown an unprecedented rise as semiconductor building blocks for solar energy conversion and light-emitting applications. Currently, the field moves empirically towards more and more complex chemical compositions, including mixed halide quadruple cation compounds that allow optical properties to be tuned and show promise for better stability. Despite tremendous progress in the field, there is a need for better understanding of mechanisms of efficiency loss and instabilities to facilitate rational optimization of composition. Starting from the device level and then diving into nanoscale properties, we highlight how structural and compositional heterogeneities affect macroscopic optoelectronic characteristics. Furthermore, we provide an overview of some of the advanced spectroscopy and imaging methods that are used to probe disorder and non-uniformities. A unique feature of hybrid halide perovskite compounds is the propensity for these heterogeneities to evolve in space and time under relatively mild illumination and applied electric fields, such as those found within active devices. This introduces an additional challenge for characterization and calls for application of complimentary probes that can aid in correlating the properties of local disorder with macroscopic function, with the ultimate goal of rationally tailoring synthesis towards optimal structures and compositions