 |
Recently, the Chinese Academy of Sciences Dalian Institute of Chemical Physics, State Key Laboratory of Catalysis and the Clean Energy National Laboratory of the Department of Solar Energy Research Li Can, 100-person plan scholar Fan Fengji and Ph.D. Zhu Jian, etc., have independently developed a nanometer surface photovoltage imaging system. For the first time, photoelectric imaging of the photogenerated charge of different crystal faces of a single photocatalyst particle was realized. It was found that there are different space charge layer built-in electric fields between the semiconductor particles. The built-in electric field can promote highly anisotropic separation of photogenerated charge. The results were published online in the journal German Applied Chemistry.
Photocatalytic water decomposition is generally considered as one of the ideal approaches to solve the energy crisis and environmental pollution in the future, and photoelectron-hole effective separation is the key to achieving efficient photo-chemical conversion of solar energy. The establishment of an effective photovoltaic system for the separation and transmission of photogenerated charge has become an important measure for the development of a highly efficient artificial light synthesis catalyst system and is an important direction for scientists in this field. In recent years, Li Can's research team has made unremitting efforts to solve this core scientific problem: by constructing a CdS/MoS2 heterojunction, better photocatalytic activity for hydrogen production than Pt/CdS photocatalyst supported by a traditional noble metal Pt (J. Am. Chem. Soc., 2008, 130, 7176-7177); It is reported for the first time in the world that the use of ultraviolet Raman spectroscopy is sensitive to the surface phase and can significantly increase the “heterojunction†between the different phases of TiO2. Enhancing the photocatalytic activity of hydrogen production; based on this, it was found that the “heterojunction†constructed with semiconductor photocatalysts based on α, β-Ga 2 O 3 can promote the photocatalytic decomposition of pure water to hydrogen production, and the use of ultrafast spectroscopy is preliminary. The nature of its photocatalytic activity was revealed (Angew. Chem. Int. Ed., 2012, 51, 13089-13092); subsequently, the research group found that BiVO4 semiconductor photocatalytic materials with regular crystal surface exposure existed between different crystal planes. Photogenerated Charge Separation Effects (Nature Comm., 2013, 4, 1432).
In order to further reveal the key scientific issues of the above-mentioned system—the spatial characteristics of photogenerated charge separation and migration, the team developed a nano-photoelectricity imaging system for the study of the spatial distribution of photogenerated charge on the surface of micro-nanoscale and single semiconductor catalyst grains— Spatially resolved surface photovoltage spectra. The researchers used this instrument to observe the difference in surface potential of different crystal planes on the BiVO4 particles. Under light excitation, spatial resolution surface photovoltage spectroscopy reveals that there are different space charge layer built-in electric fields on different crystal planes of semiconductor particles. The presence of such an electric field can enable single-crystal semiconductor photocatalysts to exhibit more than 70-fold differential hole transport anisotropy, and further use of fluorescence imaging corroborates this result. This intrinsic physical property may be the main reason for the separation of photogenerated charges between different crystal planes. This work reveals the nature of photocatalyst's photo-induced charge separation from the micro-nano scale, and provides a scientific basis for the further development of high-efficiency solar photocatalytic hydrogen production and carbon dioxide reduction and other artificial photosynthetic systems.
This work was supported by the National Natural Science Fund, the "973" Project of the Ministry of Science and Technology and the Collaborative Innovation Center for Energy Materials Chemistry (2011 · iChEM) of the Ministry of Education.
Advantages of LED Grow Light for Marijuana
Long lifetime
Recommended useful lifetime of 50, 000 hours for LED lights the equivalent of
burning a light for 18 hours A day, 365 days a year for seven years and seven months.
Energy efficient
Save 70~85% on power than HID lighting, no need extra blowers and Air conditioning systems for cooling.
Better for plant growth
Plants can use nearly all of the light emitted from LED Lights.
Only about 35% of the light generated by metal halide lamps is useful for plant growth.
Low heat output
LED lights produce very little heat.thermalelectric separation technology and modular fans can control the generated heat amount to be a very low extent.
Features
Deep penetration : Good lighting penetration , can penetrate to the deep of the plants
Modular Internal Build: Fully upgradable, easy warranties
Thermal Management: Custom copper core heatsinks quickly dissipates heat for cool operating temperatures
Powerful: 2nd Generation ultra penetration 5W LEDs light deep into the canopy
Versatile: Power cord available in 85~265V and international plugs
Lighter weight: Much lighter than the same products in the marketplace, safer for hanging .
Plants: Suitable for both vegetative phrase and flowering phrase
Item Display
What is Full spectrum led chip ?
It is the newest trend for indoor plants. Advanced LED Grow Lights chip,not provide sigle color ,provide broad spectrum 400nm~840nm,simialr with sun light ,but most is red and blue,it is best for plant grow.This is a revolutionary step for Grow light which have previously been unable to act as the sole light source for the indoor garden.Suitable for all stages of plant growth.
Advtanges:
Upgraded Epistar chips,High Lumen,High penetration.
Plug with listed certificate safe to use.
The Plug you can choose
Ageing Test
Our Quality Control systems
Package
Application: Greenhouse, Hydroponics, Aeroponics, Home Garden, Farm, Vegetable Shed, Botanic Garden, Flower Exhibitions, Horticulture, Hydroponics, Hemp Cultivations , Medical Plants Cultivations, etc.
Warnings:
1.lndoor use only.
2.To avoid being damaged,do not use water or drip irrigation while using.
3.Sunshine lighting time should be 12-18 hours.
4.While irradiating the plants,the height of led grow lamp is not less than 10 inches,
low height will cause the destruction of plants.
5.Highly hang the lamp will weaken the energy and affect the growth cycle of the
plants, so the lamp should not be hung too high.
6.While taking care of the plants, please spray the leaves and branches 2-3 times everyday,
to ensure the the plants do not wrinkle a wither, and have no phenomenon of few fruit, and
hard pericarp.
Our Company
Trade Terms
Payment: T/T, L/C, Paypal, 30% deposits before production, 70% balance to be paid before deliverying(Western Union are welcome)
Sample will be delivered within 7 working days.
Discounts are offered based on order quanlityes.
MOQ:sample order are acceptable
Delivery ways:DHL,UPS,FedEx,TNT, door to door,by sea,by air,etc.
Professional dedicated to Research, Development, Design, Manufacture of Innovative, Intelligent control and high efficiency LED grow lighting for modern agriculture,Marijuana,greenhouse,hydroponics, etc.
Large Capacity Led Grow Light,Led Grow Light For Plant Growing,Led Plant Grow Light,Cob Led Plant Grow Light
Shenzhen Phlizon Technology Co.,Ltd. , https://www.szledaquariumlighting.com