Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Hanover Trade Fair: Hydrogen Technology made by Fraunhofer - Weather-Resistant Miniature Fuel Cells and Durable SOFC Stacks

01.04.2005


SOFC stack (solid oxide fuel cell) with 20 single cells for use in decentralised power supply. Source: Fraunhofer IKTS


Fuel-cell stack during a low-temperature test. Source: Fraunhofer ISE


The newest Fraunhofer developments in hydrogen technology can be seen at the Hydrogen + Fuel Cells Stand at the Hanover Trade Fair. The Fraunhofer Institute for Ceramic Technologies and Sintered Materials IKTS will display durable SOFC stacks with a power of 1 kWel. The fuel cells are intended for application in distributed power supplies and can be operated with either fossil fuels or biogas. In addition, an extremely thin Ag/Zn micro-battery for integration in sensor cards will be presented. The Fraunhofer Institute for Solar Energy Systems ISE will display a weather-resistant, near-industrial prototype of a miniature fuel-cell system for the temperature range from -20 °C to +40 °C. The target markets are applications in off-grid measurement and controls technology, where the trend is clearly towards decentralised power supplies for the system components.

The extremely thin micro-battery developed by Fraunhofer IKTS, which is less than 0.5 mm thick, is designed for mobile, highly integrated and inexpensive applications, preferably in credit-card format. It is intended to be integrated into miniaturised electronic products, together with sensors, electronics and data interfaces. The primary battery consists of a silver oxide cathode and a zinc anode, which are deposited with thick-film technology onto the current collectors. The flexibility of thick-film technology enables electrochemical cells with differing capacities to be constructed. The capacity of the extremely thin power supplies is 15 mAh, the cell voltage is 1.5 V.

Widespread application of high-temperature solid oxide fuel cells SOFC in decentralised power supplies demands that the long-term stability and the electric contacts in the cathode chamber be improved, and that the currently high costs be reduced. Fraunhofer IKTS has been conducting research on SOFC for more than ten years and can now present stacks with a power of 1 kWel, which have a predicted lifetime of 40 000 hours. The high overall efficiency value of the SOFC, around 80 %, is a particular advantage.



In distributed applications in combined heat and power CHP systems, stack units in the power range between 1 and 5 kWel are needed. The remaining system components are responsible for purification and supply of the fuel gas, distribution and use of the heat, and voltage conversion to 220 V AC. These systems are designed for electricity and heat cogeneration in free-standing houses and apartment blocks, with only natural gas or biogas being required as the primary energy source.

Fraunhofer ISE is developing miniature fuel-cell systems in the low power range and recently extended their application range to extreme operating temperatures and air humidity values. Outdoor temperatures below freezing and high summer temperatures around 40 °C present additional challenges to the researchers. Because the reaction moisture in the fuel cell freezes and forms ice at low temperatures, and on the other hand, the membrane-electrode assembly dries out at high temperatures, it has not been possible previously to operate fuel cells under these conditions. Fraunhofer ISE has now succeeded in reproducing these extreme operating conditions in a fully automated fuel-cell test stand with an integrated climatic chamber, allowing appropriate solutions to be developed. By ingeniously guiding hot and cold air currents through the novel casing, the system heating or cooling is supported as required. With the help of innovative, microprocessor controls, the fuel cell system can now start reliably at -20 °C and still operate safely at temperatures to above 40 °C .

Hanover Trade Fair 11th-15th April 2005, Hall 13, Stand H58/7

Information Material:
Fraunhofer ISE, Press and Public Relations
Tel. +49 (0) 7 61/45 88 -51 50,
e-mail: info@ise.fraunhofer.de

Project leader at Fraunhofer IKTS
Dr Peter Otschik
Tel.: +49 (0) 3 51/25 53 506
e-mail: peter.otschik@ikts.fraunhofer.de

Project leader at Fraunhofer ISE
Dr Carsten Agert
Tel.: +49 (0) 7 61/45 88-53 46
e-mail: carsten.agert@ise.fraunhofer.de

Karin Schneider | idw
Further information:
http://www.ise.fraunhofer.de

More articles from Power and Electrical Engineering:

nachricht Supersonic waves may help electronics beat the heat
18.05.2018 | DOE/Oak Ridge National Laboratory

nachricht Researchers control the properties of graphene transistors using pressure
17.05.2018 | Columbia University

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Research reveals how order first appears in liquid crystals

23.05.2018 | Life Sciences

Space-like gravity weakens biochemical signals in muscle formation

23.05.2018 | Life Sciences

NIST puts the optical microscope under the microscope to achieve atomic accuracy

23.05.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>