Enhancing oxygen reduction reaction activity and CO2 tolerance of cathode for low-temperature solid oxide fuel cells by in situ formation of carbonates

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dc.contributor.authorRehman, AUen_AU
dc.contributor.authorLi, MRen_AU
dc.contributor.authorKnibbe, Ren_AU
dc.contributor.authorKhan, MSen_AU
dc.contributor.authorPeterson, VKen_AU
dc.contributor.authorBrand, HEAen_AU
dc.contributor.authorLi, ZHen_AU
dc.contributor.authorZhou, Wen_AU
dc.contributor.authorZhu, ZHen_AU
dc.date.accessioned2021-08-17T03:40:48Zen_AU
dc.date.available2021-08-17T03:40:48Zen_AU
dc.date.issued2019-07-31en_AU
dc.date.statistics2021-08-12en_AU
dc.description.abstractDevelopment of low-cost and cobalt-free efficient cathode materials for oxygen reduction reaction (ORR) remains one of the paramount motivations for material researchers at a low temperature (<650 °C). In particular, iron-based perovskite oxides show promise as electrocatalysts for ORR because Fe metal is cheaper and naturally abundant, exhibit matched thermal expansion with contacting components such as electrolytes, and show high tolerance in a CO2-containing atmosphere. Herein, we demonstrated a new mechanism, the in situ formation of alkali metal carbonates at the cathode surface. This new mechanism leads to an efficient and robust cobalt-free electrocatalyst (Sr0.95A0.05Fe0.8Nb0.1Ta0.1O3−δ, SAFNT5, A = Li, Na, and K) for the application of low-temperature solid oxide fuel cells (LT-SOFCs). Our results revealed that the formation of Li\K carbonates boosts the ORR activity with an area-specific resistance as low as 0.12 and 0.18 Ω cm2 at 600 °C, which show the highest performance of the cobalt-free single-phase cathode that has been ever reported so far. We also find that the chemical stability and tolerance of tested cathodes toward CO2 poisoning significantly improved with alkali carbonates, as compared to the pristine SrFe0.8Nb0.1Ta0.1O3−δ (SFNT) at 600 °C. This work demonstrates the conclusive role of alkali carbonates in developing highly efficient and stable cobalt-free cathodes for LT-SOFCs and CO2 neutralization. © 2019 American Chemical Societyen_AU
dc.identifier.citationRehman, A. U., Li, M., Knibbe, R., Khan, M. S., Peterson, V. K., Brand, H. E.A., Li, Z., Zhou, W., & Zhu, Z. (2019). Enhancing oxygen reduction reaction activity and CO2 tolerance of cathode for low-temperature solid oxide fuel cells by in situ formation of carbonates. ACS Applied Materials & Interfaces, 11(30), 26909-26919. doi:10.1021/acsami.9b07668en_AU
dc.identifier.issn1944-8252en_AU
dc.identifier.issue30en_AU
dc.identifier.journaltitleACS Applied Materials & Interfacesen_AU
dc.identifier.pagination26909-26919en_AU
dc.identifier.urihttps://doi.org/10.1021/acsami.9b07668en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11381en_AU
dc.identifier.volume11en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectRedox reactionsen_AU
dc.subjectElectrodesen_AU
dc.subjectCathodesen_AU
dc.subjectElectric conductivityen_AU
dc.subjectFuel cellsen_AU
dc.subjectDefectsen_AU
dc.subjectMaterialsen_AU
dc.subjectPerovskitesen_AU
dc.subjectOxygenen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectCarbonatesen_AU
dc.subjectAlkali metalsen_AU
dc.titleEnhancing oxygen reduction reaction activity and CO2 tolerance of cathode for low-temperature solid oxide fuel cells by in situ formation of carbonatesen_AU
dc.typeJournal Articleen_AU
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