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:4/17/2017)... , April 17, 2017 NXT-ID, Inc. ... company, announces the filing of its 2016 Annual Report on Form ... Exchange Commission. ... Form 10-K is available in the Investor Relations section of the ... on the SEC,s website at http://www.sec.gov . 2016 ...
(Date:4/13/2017)... PUNE, India , April 13, 2017 According ... Identity Proofing, Identity Authentication, Identity Analytics, Identity Administration, and Authorization), Service, Authentication ... by MarketsandMarkets™, the IAM Market is expected to grow from USD 14.30 ... Annual Growth Rate (CAGR) of 17.3%. ... ...
(Date:4/11/2017)... , Apr. 11, 2017 Research and Markets ... 2017-2021" report to their offering. ... The global eye tracking market to grow at a CAGR ... Global Eye Tracking Market 2017-2021, has been prepared based on an ... the market landscape and its growth prospects over the coming years. ...
Breaking Biology News(10 mins):
(Date:10/9/2017)... ... October 09, 2017 , ... The Giving Tree Wellness Center ... the needs of consumers who are incorporating medical marijuana into their wellness and ... , As operators of two successful Valley dispensaries, The Giving Tree’s two founders, ...
(Date:10/7/2017)... ... October 06, 2017 , ... ... advanced instruments and applications consulting for microscopy and surface analysis, Nanoscience Instruments ... consulting, Nanoscience Analytical offers a broad range of contract analysis services for ...
(Date:10/7/2017)... Oct. 6, 2017  The 2017 Nobel Prize ... scientists, Jacques Dubochet, Joachim Frank and ... cryo-electron microscopy (cryo-EM) have helped to ... structural biology community. The winners worked with systems ... routinely produce highly resolved, three-dimensional images of protein ...
(Date:10/6/2017)... ... October 06, 2017 , ... On Tuesday, October 24th, ABC² ... the first-ever adaptive clinical trial for glioblastoma (GBM). The featured speaker will be ... and open to the public, but registration is required. , WHAT: ABC² ...
Breaking Biology Technology: