Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

First Elucidation of Cause of Long-Term Stability Deterioration in Solid Oxide Fuel Cells

25.11.2011
NIMS and the University of Queensland Centre for Microscopy and Microanalysis, the Dalian Polytechnic University and the Dalian Institute of Chemical Physics clarified for the first time the cluster structure which has an extremely large effect on the long-term stability of solid oxide fuel cells for independent distributed power generation.

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.

Mikiko Tanifuji | Research asia research news
Further information:
http://www.­nims.­go.­jp/­eng/­
http://www.researchsea.com

More articles from Materials Sciences:

nachricht Researchers devise microreactor to study formation of methane hydrate
23.08.2017 | NYU Tandon School of Engineering

nachricht Meter-sized single-crystal graphene growth becomes possible
22.08.2017 | Science China Press

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>