Fuel cells are the foundation of this technology which, if it becomes industrially viable, would represent the beginning of an energy revolution that would replace the current fossil fuel based system by a model based on hydrogen. This would be an energy source that is practically endless and since it only generates water as a combustion by-product, it is ecologically friendly.
The function of fuel cells is similar to that of batteries, but while batteries only store energy in a closed chemical system, fuel cells produce energy by combusting hydrogen.
To accomplish this, fuel cells require an electrolyte that permits the flow of ions between the electrodes. The problem that scientists currently face is that a temperature of up to 800 degrees Celsius is needed to achieve a high enough ionic conductivity. Therefore the challenge they must overcome is how to reduce the working temperature of this technology to an acceptable range.
Colossal ionic conductivity
Towards this end, a research group at the Complutense University has produced a material with a new structure by alternating layers of an ion conductive material that is currently used in fuel cells (Yttria-stabilized zirconia) with a dielectric material (Strontium titanate). The combination of these two materials with very diverse crystalline structures has produced a rare atomic disposition full of gaps that act as a path for the flow of ions. This results in a colossal ionic conductivity at the transition surface between the two materials.
The image of the molecular structure of this material has been obtained at the Oak Ridge national laboratory (USA) using a scanning transmission electron microscope with a resolution of less than 0,1 nanometres (the approximate size of an hydrogen atom). The researchers were very surprised to see in the images a perfectly structured growth at the atomic level, in spite of the very different structures of the materials. As a matter of fact, this result was absolutely unexpected according to the experience gathered from the analysis of this type of structures.
An even greater surprise was the high degree of ionic conductivity, measured at the Universidad Complutense in collaboration with the Universidad Politécnica de Madrid. It is about a hundred million times higher than that of materials used at present for the fabrication of fuel cells. This characteristic could allow their use at room temperature, permitting extensive use of hydrogen as an alternative energy source.
Área de Cultura Científica | alfa
Electromagnetic water cloak eliminates drag and wake
12.12.2017 | Duke University
Two holograms in one surface
12.12.2017 | California Institute of Technology
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
14.12.2017 | Health and Medicine
14.12.2017 | Physics and Astronomy
14.12.2017 | Life Sciences