Search results for "PCFC"
showing 4 items of 4 documents
DOUBLE BLIND PLACEBO CONTROLLED FOOD CHALLENGE USEFUL TO DISCONFIRM OVER ESTIMATED DIAGNOSIS OF CMPA IN CHILDREN
2009
Solid–Solid Interfaces in Protonic Ceramic Devices: A Critical Review
2020
The literature concerning protonic ceramic devices is critically reviewed focusing the reader's attention on the structure, composition, and phenomena taking place at solid-solid interfaces. These interfaces play a crucial role in the overall device performance, and the relevance of understanding the phenomena taking place at the interfaces for the further improvement of electrochemical protonic ceramic devices is therefore stressed. The grain boundaries and heterostructures in electrolytic membranes, the electrode-electrolyte contacts, and the interfaces within composite anode and cathode materials are all considered, with specific concern to advanced techniques of characterization and to …
X-ray Spectroscopy of (Ba,Sr,La)(Fe,Zn,Y)O3-δIdentifies Structural and Electronic Features Favoring Proton Uptake
2020
Mixed protonic–electronic conducting oxides are key functional materials for protonic ceramic fuel cells. Here, (Ba,Sr,La)(Fe,Zn,Y)O3−δ perovskites are comprehensively investigated by X-ray spectroscopy (in oxidized and reduced states). Extended X-ray absorption fine structure shows that Zn,Y doping strongly increases the tendency for Fe–O–Fe buckling. X-ray absorption near-edge spectroscopy at the Fe K-edge and X-ray Raman scattering at the O K edge demonstrate that both iron and oxygen states are involved when the samples are oxidized, and for the Zn,Y doped materials, the hole transfer from iron to oxygen is less pronounced. This can be correlated with the observation that these material…
Kobaltu un dzelzi saturošu perovskītu materiālu aprēķini, izmantojot AOLK metodi ar hibrīdiem blīvuma funkcionāļiem
2020
Degvielas šūnu tehnoloģijas ir daudzsološs videi draudzīgas alternatīvās enerģijas avots,taču šobrīd to galvenie ierobežojumi, kas liedz tās efektīvi izmantot, balstās augstajā darbatemperatūrā vai dārgmetālu izmantošanā. Darba temperatūras samazinājums ļautu būtis-ki samazināt izmaksas, kā arī palielinātu degvielas šūnu efektivitāti. To iespējams paveikt,izmantojot protonus vadošās keramiskās degvielas šūnas (PCFC), pretstatā pārējām cietvie-lu degvielas šūnām, kuras balstās uz oksīdu vadītspēju. Pretēji elektrolītu materiāliem [1],optimālos katodu materiālus vēl nepieciešams identificēt, meklējot cieto šķīdumu sastāvuar pietiekami augstu elektronu un protonu vadītspēju, kā arī izprast jon…