{"id":1142,"date":"2010-07-01T14:19:58","date_gmt":"2010-07-01T18:19:58","guid":{"rendered":"https:\/\/wpmu2.mit.local\/?p=1142"},"modified":"2010-07-01T14:19:58","modified_gmt":"2010-07-01T18:19:58","slug":"microfabricated-thin-film-electrodes-for-solid-oxide-fuel-cells","status":"publish","type":"post","link":"https:\/\/wpmu2.mit.local\/microfabricated-thin-film-electrodes-for-solid-oxide-fuel-cells\/","title":{"rendered":"Microfabricated Thin-film Electrodes for Solid Oxide Fuel Cells"},"content":{"rendered":"

Micro-solid oxide fuel cells (SOFCs) are currently under intense investigation for portable power applications, such as notebook computers and mobile phones [1<\/a>]<\/sup> [2<\/a>]<\/sup>.\u00a0 In this work, thin-film SrTi1-x<\/sub>Fex<\/sub>O3<\/sub> (STF) cathodes were fabricated on top of single-crystal yttria-doped zirconia (YSZ) solid electrolyte substrate by a pulsed laser deposition (PLD), (see Figure 1), and their material and morphological properties were systematically investigated in relation to the cathodic performance of the STF.<\/p>\n

Impedance spectra were collected on symmetrical cells of the type STF\/YSZ\/STF. Measurements were performed over the temperature range of 570 \u2013 650\u00b0C and the pO2<\/sub> range of 2×10-5<\/sup> \u2013 1 atm. The STF cathode was observed to exhibit typical mixed ionic-electronic behavior, demonstrating fast surface oxygen exchange kinetics comparable to those exhibited by other popular mixed ionic-electronic conductors such as (La,Sr)(Co,Fe)O3<\/sub>, thereby confirming the suitability of STF as a model mixed-conducting cathode material.<\/p>\n

The magnitude of the surface exchange coefficient, k<\/em>, was found to be only weakly dependent on the magnitudes of the electronic and ionic conductivities as well as carrier densities (over nearly five orders of magnitude change in sel<\/sub>) over the x values (0.05-1.0) examined in this study. On the other hand, an appreciable degree of Sr-excess near the surface of the STF thin film was found by means of XPS, indicating a possible correlation between the cathode performance and the surface chemistry.<\/p>\n

\"Figure<\/a>

Figure 1: A photograph (left) and a schematic illustration (right) of STF thin films deposited by pulsed layer deposition (PLD).<\/p><\/div>\n

\r\nReferences
  1. C.D. Baertsch, K.F. Jensen, J.L. Hertz, H.L. Tuller, S.T. Vengallatore, S.M. Spearing, and M.A. Schmidt, Journal of Materials Research<\/em> 19<\/strong> (9), 2604 (2004). [↩<\/a>]<\/li>
  2. D. Nikbin, The Fuel Cell Review<\/em> 3<\/strong>, 21 (2006). [↩<\/a>]<\/li><\/ol><\/div>","protected":false},"excerpt":{"rendered":"

    Micro-solid oxide fuel cells (SOFCs) are currently under intense investigation for portable power applications, such as notebook computers and mobile…<\/p>\n<\/div>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[70,4117],"_links":{"self":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts\/1142"}],"collection":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/comments?post=1142"}],"version-history":[{"count":4,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts\/1142\/revisions"}],"predecessor-version":[{"id":1148,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/posts\/1142\/revisions\/1148"}],"wp:attachment":[{"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/media?parent=1142"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/categories?post=1142"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpmu2.mit.local\/wp-json\/wp\/v2\/tags?post=1142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}