Name: probing and mapping electrode surfaces in solid oxide fuel cells
Uploaded: 2012-09-20T13:00:00
Description: Watch this Scientific Journal Video about Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells at JoVE.com

Dette arbejde blev støttet af HeteroFoaM Center, en Energy Frontier Research Center finansieret af det amerikanske Department of Energy, Office of Science, Office of Basic Energi Videnskaber (BES) under Award Number DE-SC0001061.

1. Fremstilling af en YSZ-embedded Mesh Anode Cell <ol><li> Afvej to portioner af 0,2 g YSZ pulver. </li><li> Komprimere én batch YSZ pulver i en cylindrisk rustfrit stålform (13 mm i diameter) med en uniaksial tør presse ved et tryk på 50 MPa i 30 sek. </li><li> Skær en &lt;1 cm stykke af Ni mesh og placere den på overfladen af ​​YSZ disk inde i formen. </li><li> Tilføje den anden 0,2 g YSZ pulver oven på Ni-mesh inde i formen og flade overflade af pulveret under anvendelse af en vædder. </li><li> Uniaks...

<ol>
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Svovlforgiftning Analysis Impedans spektre vist i figur 5 antyder, at svovlforgiftning er en overflade eller grænseflade-fænomen snarere end en, der påvirker størstedelen af materialet. Præcist vil hurtig forgiftning af Ni mesh elektrode (figur 6) skyldes direkte eksponering af Ni elektrode til brændgas og efterfølgende svovl adsorption, gasdiffusion ikke begrænse hastigheden af denne proces, såvel som i tilfælde af en tykt porøst Ni / YSZ anode. St?...

<table border="1"><tbody><tr><td> Navn på reagens / Material </td><td> Firma </td><td> Catalog Number </td><td> Kommentarer </td></tr><tr><td> Nikkel mesh </td><td> Alfa Aesar </td><td> CAS: 7440-02-0 </td><td></td></tr><tr><td> Ni Folie </td><td> Alfa Aesar </td><td> CAS: 7440-02-0 </td><td></td></tr><tr><td> YSZ pulver </td><td> TOSOH </td><td> Delaftale nr.: S800888B </td><td></td></tr><tr><td> Ag pasta </td><td> Heraeus </td><td> C8710 </td><td></td></tr><tr><td> Bariumoxid </td><td> Sigma-Aldrich </td><td> 1304-28-5 </td><td></td></tr><tr><td> Sølvtråd </td><td> Alfa Aesar </td><td> 7440-22-4 </td><td></td></tr><tr><td> Acetone </td><td> VWR </td><td> 67-64-1 </td><td></td></tr><tr><td> Ethanol </td><td> Alfa Aesar </td><td> 64-17-5 </td><td&gt; </td></tr><tr><td> UHP H 2 </td><td> Airgas </td><td></td><td> 99,999% renhed </td></tr><tr><td> 100 ppm H2S / H2 </td><td> Airgas </td><td></td><td> Certificeret specielt miks </td></tr><tr><td> n-type Si AFM tip </td><td> MikroMasch </td><td> NSC16 </td><td> 10 nm næseradius </td></tr><tr><td> Au belagt AFM spids </td><td> MikroMasch </td><td> CSC11/Au/Cr </td><td> 20-30 nm næseradius </td></tr><tr><td> Raman-spektrometer </td><td> Renishaw </td><td> RM1000 </td><td></td></tr><tr><td> Ar ion laser </td><td> ModuLaser </td><td> StellarPro 150 </td><td></td></tr><tr><td> He-Ne laser </td><td> Thorlabs </td><td> HPL170 </td><td></td></tr><tr><td> Atomic Force Microscope </td><td> Veeco </td><td> Nanoscope IIIA </td><td></td></tr><tr><td> Flytning Raman Stage </td><td> Forudgående videnskabelig </td><td> H101RNSW </td><td></td></tr><tr><td> Optisk mikroskop </td><td> Leica </td><td> DMLM </td><td></td></tr><tr><td> Scanningselektronmikroskop </td><td> LEO </td><td> 1550 </td><td></td></tr><tr><td> Tube Furnace </td><td> Anvendt Test Systems </td><td> 2110 </td><td></td></tr><tr><td> Polermaskine </td><td> Allied højteknologiske produkter </td><td> MetPrep </td><td></td></tr><tr><td> 6 um formalingsmedier </td><td> Allied højteknologiske produkter </td><td> 50-50040M </td><td></td></tr><tr><td> 3 um Polering medier </td><td> Allied højteknologiske produkter </td><td> 90-30020 </td><td></td></tr><tr><td> 1 um Polering medier </td><td> Allied højteknologiske produkter </td><td> 90-30015 </td><td></td></tr><tr><td> 0,1 uM Polering medier </td><td> Allied højteknologiske produkter </td><td> 90-32000 </td><td></td></tr><tr><td> Raman kammer </td><td> Harrick Scientific </td><td> HTRC </td><td></td></tr></tbody></table>

probing and mapping electrode surfaces in solid oxide fuel cells

Fastoxidbrændselsceller (SOFC) er potentielt den mest effektive og omkostningseffektive løsning ved anvendelse af et bredt udvalg af brændsler ud over hydrogen 1-7. Udførelsen af ​​SOFC og satserne for mange kemiske og energi transformationsprocesser i energilagring og konverteringsenheder i almindelighed er primært begrænset af ladning og masse transfer langs elektrodeoverflader og på tværs af grænseflader. Desværre er mekanistisk forståelse af disse processer stadig mangler, hvilket især skyldes vanskeligheden ved at karakterisere disse processer under in situ-betingelser. Denne mangel på viden er en væsentligste hindring for SOFC kommercialisering. Udviklingen af værktøjer til sondering og kortlægge overflade kemier relevante for elektrode reaktioner er afgørende for at udrede de mekanismer overfladeprocesser og opnå rationelt design af nye elektrode materialer til mere effektiv energilagring og konvertering 2. Blandt de relativt få in situ &lt;/ Em&gt; overflade analysemetoder, kan Raman spektroskopi udføres selv med høje temperaturer og barske stemninger, hvilket gør den ideel til at karakterisere kemiske processer der er relevante for SOFC anode ydeevne og nedbrydning 8-12. Det kan også bruges sammen med elektrokemiske målinger, som potentielt giver direkte korrelation mellem elektrokemi at overfladekemi i et operativsystem celle. Korrekt in situ Raman kortlægning målinger vil være nyttigt for pin-pointing vigtige anode reaktionsmekanismer grund af dens følsomhed over for de relevante arter, herunder anode forringelse af ydeevnen gennem carbon deposition 8, 10, 13, 14 (&quot;forkoksning&quot;) og svovlforgiftning 11, 15 og den måde, hvorpå overflademodifikationer afværge denne nedbrydning 16. Den nuværende arbejde viser betydelige fremskridt hen imod denne evne. Desuden giver familien af ​​scanning probe mikroskopi (SPM) teknikker en særlig tilgang at afhøre den elektrode overflade med nanoskala opløsning. Udover den overfladetopografi, der rutinemæssigt indsamlet af AFM og STM, kan andre egenskaber, såsom lokale elektroniske tilstande, ion diffusionskoefficient og overfladepotentiale også undersøges, 17-22. I dette arbejde blev elektrokemiske målinger, Raman spektroskopi, og SPM anvendes i forbindelse med en hidtil ukendt testelektroden platform, der består af en Ni mesh elektrode indlejret i en yttriumoxid-stabiliseret zirkoniumoxid (YSZ) elektrolyt. Cell præstationstests og impedansspektroskopi under brændstof indeholdende H2S blev karakteriseret, og Raman kortlægning blev anvendt til yderligere at belyse beskaffenheden af svovlforgiftning. In situ Raman kontrol blev anvendt til at undersøge koksdannelse adfærd. Endelig atomic force mikroskopi (AFM) og elektrostatisk force microscopy (EFM) blev anvendt til yderligere at visualisere carbonaflejring på nanoskala. Fra denne forskning, ønsker vi at producere et mere fuldstændigt billede af SOFC anode.

Svovlforgiftning Analysis Vist i figur 4 er typiske IV og IP-kurver af en celle med en Ni mesh elektrode under H2 og 20 ppm H2S tilstand. Det er klart, kan indførelsen af selv bare et par ppm H 2 S forgifte Ni-YSZ anode og forårsage betydelig forringelse af ydeevnen. For at mere intensivt forstå forgiftning adfærd Ni-YSZ anode, blev AC impedansspektroskopi af cellen udført under tomgangsspænding (OCV) betingels...

Watch this Scientific Journal Video about Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells at JoVE.com

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

Vi præsenterer en unik platform til at karakterisere elektrodeoverflader i fastoxidbrændselsceller (SOFC), der tillader samtidig udførelse af flere teknikker til karakterisering (<em&gt; Fx in situ</em&gt; Raman spektroskopi og scanning probe mikroskopi sammen elektrokemiske målinger). Supplerende oplysninger fra disse analyser kan bidrage til at fremme mod en dybere forståelse af elektrode reaktion og nedbrydningsmekanismer, der giver indsigt i rationelt design af bedre materialer til SOFC.

Sondering og kortlægning elektrodeoverflader i Solid Oxide Fuel Cells

Solid oxide fuel cells (SOFCs) are potentially the most efficient and cost-effective solution to utilization of a wide variety of fuels beyond hydrogen ...

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