Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Fuel Cell Innovation: Novel cathode materials for SOFC with high performance and ...

14.08.2013
... strong reliability at the intermediate temperature

Researchers from Ulsan National Institute of Science and Technology (UNIST), Georgia Institute of Technology and Dong-Eui University have developed a novel cathode material which has outstanding performance and robust reliability even at the intermediate temperature range.

Researchers from Ulsan National Institute of Science and Technology (UNIST), Georgia Institute of Technology and Dong-Eui University have developed a novel cathode material which has outstanding performance and robust reliability even at the intermediate temperature range.

This research was published in Scientific Reports on August 13. (Title: Highly Efficient and robust cathode materials for low-temperature solid fuel cells: PrBa0.5Sr0.5Co2-xFexO5+ä )

As high power density devices, fuel cells can convert chemical energy directly into electric power very efficiently and environmentally friendly. Solid oxide fuel cells (SOFCs), based on an oxide ion conducting electrolyte, have several advantages over other types of fuel cells, including relatively inexpensive material costs, low sensitivity to impurities in the fuel, and high overall efficiency.

To make SOFC technology more affordable, the operating temperature must be further reduced so that substantially less expensive materials may be used for the cell components. Also there will be more choices of materials for other components with lower operating temperature.

However, at the low operating temperature, the problem is that the efficiency drop by the cathode is especially dramatic than the one due to the anode and/or electrolyte. It means that the cathode, as a key component of SOFC, contributes the most to the polarization loss during intermediate temperature operation. As a result, the development of feasible low temperature SOFCs requires the generation of highly efficient cathode materials.,

A UNIST research team tried to co-dope Sr and Fe and succeeded in yielding remarkable out-performance to present materials at lower operating temperature. The optimized composition has facilitated excellent oxygen reduction reaction and the novel structure has created pore channels that dramatically enhance oxygen ion diffusion and surface oxygen exchange while maintaining excellent compatibility and stability under operating conditions.

“The hardest part of this research was finding optimum composition of Sr and Fe for the best performance and robustness,” said Prof. Kim. “Previously various researches trying to dope Sr to perovskite structure had been made by many other groups. But none of them was successful for the better performance at the low operating temperature.”

The new material developed by the UNIST research team led by Prof. Guntae Kim, could be used at significantly low temperature SOFC with higher efficiency and solid reliability than the previously reported materials.

This new novel cathode material enables the fuel cell designers have more flexible choices on the materials of fuel cell components, which leads to the lower fuel cell cost and, finally, to the step closer to the highly efficient and reliable fuel cells.

This research was supported by World Class University (WCU) program and Mid-career Researcher Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology and the New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning grant funded by the Ministry of Knowledge Economy.

Eunhee Song | Research asia research news
Further information:
http://www.unist.ac.kr
http://gunslab.unist.ac.kr/
http://www.researchsea.com

More articles from Materials Sciences:

nachricht Nagoya physicists resolve long-standing mystery of structure-less transition
21.08.2017 | Nagoya University

nachricht Scientists from the MSU studied new liquid-crystalline photochrom
21.08.2017 | Lomonosov Moscow State University

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

Molecular volume control

22.08.2017 | Life Sciences

When fish swim in the holodeck

22.08.2017 | Life Sciences

Biochemical 'fingerprints' reveal diabetes progression

22.08.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>