Dr. Toshiyuki Mori, Group Leader of the Hetero-interface Design Group, Battery and Fuel Cell Field, Global Research Center for Environment and Energy Based on Materials Science (GREEN), National Institute for Materials Science (President: Sukekatsu Ushioda), and Dr. Zhipeng Li, a Postdoctoral Researcher at GREEN, in joint research with Prof. John Drennan of the University of Queensland Centre for Microscopy and Microanalysis (Australia), the Dalian Polytechnic University (China), and the Dalian Institute of Chemical Physics, Chinese Academy of Science (China), clarified for the first time the cluster structure which has an extremely large effect on the long-term stability of solid oxide fuel cells (SOFC) for independent distributed power generation. This result was achieved by transmission electron microscope (TEM) observation and computer simulation based on the results thereof.
Active development of fuel cells for home use and large-scale generating systems using SOFC has been underway up to the present. However, while it was possible to manufacture devices which sufficiently satisfied performance requirements, elements of instability remained from the viewpoints of reliability and life, and these were major obstacles to practical application.
In this experiment, the nanoscale defect structures of high performance specimens and specimens which exhibited serious deterioration in performance were observed using a high resolution transmission electron microscope (TEM), and their distinctive features were then analyzed in computer simulations. This research ascertained for the first time that a “new oxygen defect cluster structure” which has a structure different from the “oxygen defect (oxygen vacancy) cluster structure” long considered to be the cause of reduced performance, forms in the material, triggering a phase transition, and this has a negative impact on the reliability and durability of fuel cells.
Various puzzling phenomena in SOFC, had been un-explained until now. These are (1) reason why a crystal phase transition occurs together with performance deterioration, (2) reason why adequate reliability cannot be maintained, etc., and they can be interpreted rationally using a model of this oxygen defect cluster structure. As a result effective solutions to these problems can be proposed based on materials science, and the development of high performance, high reliability, long life SOFC materials for use in independent distributed generation is expected to become possible.
These results were published online on November 7 in “Rapid communications” in the journal of the American Institute of Physics, Physical Review B.
For graphite pellets, just add elbow grease
23.03.2018 | Rice University
23.03.2018 | Fraunhofer-Institut für Produktionstechnik und Automatisierung IPA
Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.
The "traffic situation" in space is very tense: the Earth is currently being orbited not only by countless satellites but also by a large volume of space...
An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.
The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...
In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.
Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.
They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...
A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...
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