Aiming at a tradeoff between the chemical stability of La2NiO4+δ (LNO) and the high electrochemical performances of Pr2NiO4+δ (PNO), La2−xPrxNiO4+δ mixed nickelates, further referred as LPNO, were studied as possible oxygen electrodes for solid oxide fuel cells (SOFCs). LPNO phases were synthesized using the modified citrate–nitrate route followed by a heat treatment at 1200°C for 12h under air. Structural characterizations of those K2NiF4-type compounds show the existence of two solid solutions with orthorhombic structure, namely a La-rich one from x=0 to 0.5 with Fmmm space group, and a Pr-rich one from x=1.0 to 2.0 with Bmab space group. The mixed ionic and electronic conducting (MIEC) properties of LPNO phases were investigated through the evolution of the oxygen over-stoichiometry, δ, measured as a function of temperature and pO2, the electrical conductivity, the diffusion and surface exchange coefficients versus x, showing that all compositions exhibit suitable characteristics as cathode materials for SOFCs. In particular, the electrochemical performances measured in symmetrical cells using LPNO materials sintered under low pO2, as requested in metal supported cell, (MSC-conditions) confirmed a decrease in polarization resistance values, Rp, from 0.93Ωcm2 (LNO) down to 0.15Ωcm2 (PNO) at 600°C with increasing x.
Solid State Ionics – Elsevier
Published: Oct 1, 2015
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.
All for just $49/month
Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.
Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.
It’s easy to organize your research with our built-in tools.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera