Navigation Links
Unlocking fuel cell conductivity
Date:2/27/2013

Yttria stabilized zirconia, also known as YSZ, is a material of great interest because of its relatively high oxygen-ion based conductivity. In particular, it finds applications in electrochemical devices, such as solid oxide fuel cells and oxygen sensors. In a study published in EPJ B, Kia Ngai, from the University of Pisa in Italy, and colleagues from the Complutense University in Madrid, Spain, devised a model of the oxygen-ion dynamics that contribute to the conductivity of YSZ.

The problem is that fuel cells currently operate above 700 C, which strongly limits their use. Understanding oxygen-ion diffusion is key to helping lower operating temperature down to room temperature. Previous attempts to do so were done with the so-called coupling model (CM), describing simple physical concepts related to ion-ion interaction. This helped uncover the importance of ion-ion correlation in limiting long-range ion mobility, and thus conductivity.

The trouble is that experiments show that ionic conductivity in YSZ requires an activation energy that is much higher than that supplied by computer simulations describing independent ion hopping. Relying on the CM model, the authors first established a quantitative description of the ion dynamics in YSZ. Then they compared the predictions of the CM with experimental results and with simulations, particularly those of nanometric-scale thin films, published in the last ten years.

Thus, in their model, they established the connection between the level of the energy barrier for independent ion-hopping simulations and the level of activation energy measured experimentally for long-range movement of oxygen ions. In addition, they attributed an increase of the conductivity in nanometers-thick YSZ films to a decrease in the ion-ion correlations. This model could also be used to study the conductivity relaxation of so-called molten, glassy and crystalline ionic conductors and ambient temperature ionic liquids.


'/>"/>
Contact: Sophia Grein
sophia.grein@springer.com
49-622-148-78414
Springer
Source:Eurekalert

Related biology news :

1. Biologists unlocking the secrets of plant defenses, 1 piece at a time
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/22/2016)... Calif. , Dec. 20, 2016  As part of ... 23andMe, the leading personal genetics company, recently released its latest ... . The book focuses on the topics of inheritance ... Generation Science Standards (NGSS) taught in elementary school classrooms in ... in a series by illustrator Ariana Killoran , whose ...
(Date:12/19/2016)... TORONTO , 19 de diciembre de 2016  Mosaic Biomedicals ... el desarrollo acelerado de MSC-1, un anticuerpo humanizado que se espera ... en 2017, con múltiples sitios previstos a lo largo de Europa ... MSC-1 ... factor inhibidor de leucemia (LIF), una citoquina pleiotrópica que se sobreexpresa ...
(Date:12/15/2016)... Germany , December 15, 2016 ... today announced an agreement with NuData Security, an award-winning ... The partnership will enable clients to focus on good customer ... data protection regulation. ... In order to provide a one-stop fraud prevention ...
Breaking Biology News(10 mins):
(Date:1/12/2017)... WASHINGTON, DC , January 12, 2017 ... set up the world,s biggest facility for producing mycorrhizae. ... translated the nutrient tapping potential of mycorrhizae and developed ... ...      (Logo: http://mma.prnewswire.com/media/456932/PRNE_TERI_Logo.jpg) The TERI ...
(Date:1/12/2017)... ... January 12, 2017 , ... ... RURO has enhanced the platform to accommodate increasingly complex and sophisticated deployments, ... searching, and more. In addition to these improvements, the latest release brings ...
(Date:1/11/2017)... ... January 11, 2017 , ... Photonics industry and ... , are commending the U.S. Congress and President Obama for their recognition of ... of the American Innovation and Competitiveness Act (AICA). , The language of the ...
(Date:1/11/2017)... ... January 11, 2017 , ... Microbial ... ground-breaking microbiome studies. Its most recent microbiome impact grant award has been made ... the effect of long-term use of oral antibiotics, prescribed for skin conditions, on ...
Breaking Biology Technology: