Since "artificial leaf" concept put forward, the scientists have been high hopes to its, hope it can end up with a cheap since the control system,solar inverter and supply power for billions of the population in developing countries.
According to physicists organization network reported recently, the United States at the Massachusetts institute of technology (MIT), a research group on the efficiency of "artificial leaf" system limiting factor are analyzed in detail and design again, make it more close to reality,solar inverter and is expected to bring a practical, cheap commercial prototype.
Relevant papers published in the proceedings of the national scientific research.
"Artificial leaf" system combines two technologies: one is the standard silicon solar inverter, and converts solar inverter into electricity; 2 it is to connect the chemical catalyst on both sides of the battery.
Becomes a combination use of solar power inverter to split water into hydrogen and oxygen to the electrochemical devices, hydrogen produced by fuel cells or other device used to solar power inverter.
In this system, the solar power inverter system and electrochemical performance of the system are determined, therefore the combination of efficiency is also predictable.
In the thesis, the researchers describe their design a framework to guide people how to get the output power of solar grid tie inverter and electrochemical reaction system more effectively, proposed a more economic use of the existing solar grid tie inverter technology (such as silicon or cadmium telluride, and determine the efficiency of some threshold.
"This is a rather comprehensive analysis, survey of the existing technology on the market at present can do the best." MIT postdoctoral marc winkler said.
Research team has for the first time in 2011 show their "artificial leaf", but this time, the conversion efficiency is less than 4.7%.
New research is the "solar grid tie inverter" to continue.
MIT mechanical engineering associate professor Tony, Mr Boehner, who said, according to the latest analysis, using a single band gap semiconductor, such as crystalline silicon, and the combination of cobalt and nickel oxide catalyst, maximum conversion efficiency could reach 16% or higher.
"We are also very surprised." Winkler said, the traditional view, the characteristics of silicon solar cells, severely restricts their decomposition efficiency of water, but that is not the case.
Improving the efficiency of conversion from "solar grid tie inverter- fuel" is the key to combine appropriate battery with suitable catalysts, which requires a roadmap, guiding people how to matching can achieve the optimal.
Boehner said the sith with their design, to simulate the framework of traditional silicon based system, the maximum value of efficiency is about 16%; And for gallium arsenide battery system, limit efficiency can reach 18%.
没有评论:
发表评论