According to the Nikkei BP news agency, TU Ilmenau, HZB, Fraunhofer ISE, and California Institute of Technology A team of researchers from the institute announced that the energy conversion efficiency of solar to H2 was achieved at Solar-To-Hydrogen (STH), one of the artificial photosynthesis technologies that separate hydrogen (H2) from solar-powered water. 14%. It is said that the durability is more than 40 hours. Its technical details have been published in the academic journal Nature Communications.
Conversion efficiency of 15%, it will exceed fossil fuels
STH is a technology that uses the same components as a solar cell to electrolyze water instead of electricity to generate H2. If the conversion efficiency of more than 15%, and durability of more than 1000 hours, it is expected to cost less than 4 US dollars / kg of H2, its benefits may be better than the fossil fuel H2. The National Renewable Energy Laboratory (NREL) at the Department of Energy's (DOE) Institute accelerated STH research and development from the second half of the 2000s, proposing a 2015 conversion efficiency of 15% and a durability of about six months Actually 875 hours), 20% by 2020, durability of 2 years (actual 3500 hours), 25% by 2025 and durability of 10 years (actually 17500 hours).
However, the previous highest conversion efficiency was 12.4% reached in 1998 17 years ago, and the durability was less than 24 hours. In recent research, although the durability is longer, there are more development cases with the conversion efficiency below 10%. In general, STH conversion efficiency and durability of this shift, while improving both is not easy.
Durability increased from a few seconds to more than 40 hours
The trial is made of III-V compound double junction STH components. When a catalyst layer is laminated on the surface of a Window layer made of AlInP, high conversion efficiency is obtained by "forming a layer surface with a processing precision of 1 nm or less" (Matthias May, first author, Ilmenauer Polytechnic Institute). But the initial durability of only a few seconds. Allegedly spent a year to improve, eventually achieving more than 40 hours of durability.
Developed STH element with 14% conversion efficiency
Hans-Joachim Lewerenz, a member of the research team and a professor at the Joint Photonics Center at the California Institute of Technology, said, "We are approaching the goal of 15% conversion efficiency and durability of more than 1,000 hours." If we are pushing to reduce the number of carriers The success of the loss study, then the conversion efficiency is expected to reach more than 17%. "
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