Details

Autor(en) / Beteiligte

• Chockalingam, Rajalekshmi
• Ganguli, Ashok Kumar
• Basu, Suddhasatwa

Titel

Praseodymium and gadolinium doped ceria as a cathode material for low temperature solid oxide fuel cells

Ist Teil von

• Journal of power sources, 2014-03, Vol.250, p.80-89

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2014

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Mixed ionic electronic conducting praseodymium and gadolinium doped ceria (PrxCe0.95−xGd0.05O2−δ (0.15 ≤ x ≤ 0.40)) compositions have been studied as a cathode material for low temperature solid oxide fuel cells. Four compositions of PrxCe0.95−xGd0.05O2−δ (PCGO) have been prepared by varying the praseodymium content. Phase formation, thermal expansion, ionic conductivity, electronic conductivity, ionic transference number and electrochemical performance have been investigated. X-ray diffraction results indicate that PCGO samples crystallize in the fluorite structure, and the lattice volume decreases with increasing praseodymium content, x. The coefficient of thermal expansion increases with increasing x, and at x = 0.2 shows an optimum value of 12 × 10−6 K−1. Ionic transference number decrease while electronic conductivity increase with increasing x. It has been found that electronic contribution to the total conductivity is higher than ionic contribution for all compositions. The praseodymium doping with cerium dioxide introduces impurity bands within the ceria band gap and facilitates the electronic transition from valance band to conduction band through praseodymium impurity levels. The single cell with configuration, Pr0.2Ce0.75−xGd0.05O2−δ–Ce0.80Gd0.20O2−δ∥Ce0.80Gd0.20O2−δ∥NiO–Ce0.80Gd0.20O2−δ delivers a maximum power density of 98 mW cm−2 at 650 °C. •PrxCe0.95−xGd0.05O2−δ (0.15 ≤ x ≤ 0.4) is investigated as cathode for LT-SOFC.•The composition x = 0.2 exhibited compatible CTE value with that of GDC.•The composition x = 0.2 demonstrated optimum electronic and ionic conductivity.•Single cell with PCGO cathode delivered maximum power density 98 mW cm−2 at 650 °C.