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- Bursell, MartinKTH,Kemiteknik (författare)
La0.6Ca0.4CoO3, La0.1Ca0.9MnO3 and LaNiO3 as bifunctional oxygen electrodes
- Artikel/kapitelEngelska2002
Förlag, utgivningsår, omfång ...
- 2002
- printrdacarrier
Nummerbeteckningar
- LIBRIS-ID:oai:DiVA.org:kth-21515
- https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-21515URI
- https://doi.org/10.1016/S0013-4686(02)00002-6DOI
Kompletterande språkuppgifter
- Språk:engelska
- Sammanfattning på:engelska
Ingår i deldatabas
- SwePubSwePub
Klassifikation
Anmärkningar
- QC 20100525
- A series of perovskite catalysts was investigated for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline electrolyte and at room temperature, supplied by oxygen or air. A meniscus cell was used to screen-test candidate catalysts for their bifunctionality and assess their activity for ORR at 3 mm depth of immersion (DOI) in the electrolyte. Based on the meniscus data LaNiO3, La0.1Ca0.9MnO3 and La0.6Ca0.4CoO3 were selected for further assessment in microelectrode and half-cell studies. Activity tests for the ORR and OER, Tafel slopes at high current densities and apparent activation energies for the ORR were determined using a microelectrode technique on samples of the selected perovskites, La0.1Ca0.9MnO3, La0.6Ca0.4CoO3 and LaNiO3 with and without graphite support. Tafel slopes of ca. 120 mV per decade and apparent activation energies of approximately 18 kcal mol(-1) were measured at high cathodic current densities. Cycle-life and performance of La0.1Ca0.9MnO3, La0.6Ca0.4CoO3 and LaNiO3-based gas-diffusion electrodes in half-cell configurations were tested at a constant current density of 25 mA cm(-2) With subsequent and intermittent polarizations. Similar activities resulted in the ORR, while increased numbers of cycles were observed for the La0.1Ca0.9MnO3-based electrode. Furthermore, electrode material compositions, especially PTFE contents were optimized to conform to the establishment of the three phase interactions of the electrode structure, Transmission Electron microscopy (TEM) and BET-surface area analyses were carried out in order to find out the morphological and surface properties of the perovskite materials.
Ämnesord och genrebeteckningar
- bifunctional electrode
- perovskite
- microelectrode
- gas-diffusion electrode
- stability
- activity
- alkaline fuel-cells
- reduction
- evolution
- perovskites
- platinum
- iridium
- nickel
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Pirjamali, M. (författare)
- Kiros, YohannesKTH,Kemiteknik(Swepub:kth)u1josffr (författare)
- KTHKemiteknik (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Electrochimica Acta47:10, s. 1651-16600013-46861873-3859
Internetlänk
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- Bursell, Martin
- Pirjamali, M.
- Kiros, Yohannes
- Artiklar i publikationen
- Electrochimica A ...
- Av lärosätet
- Kungliga Tekniska Högskolan
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