Intermediate Temperature Anode‐Supported Fuel Cell Based on BaCe_0.9Y_0.1O₃ Electrolyte with Novel Pr₂NiO₄ Cathode

Abstract

A proton conducting ceramic fuel cell (PCFC) operating at intermediate temperature has been developed that incorporates electrolyte and electrode materials prepared by flash combustion (yttrium‐doped barium cerate) and auto‐ignition (praseodymium nickelate) methods. The fuel cell components were assembled using an anode‐support approach, with the anode and proton ceramic layers prepared by co‐pressing and co‐firing, and subsequent deposition of the cathode by screen‐printing onto the proton ceramic surface. When the fuel cell was fed with moist hydrogen and air, a high Open Circuit Voltage (OCV > 1.1 V) was observed at T > 550 °C, which was stable for 300 h (end of test), indicating excellent gas‐tightness of the proton ceramic layer. The power density of the fuel cell increased with temperature of operation, providing more than 130 mW cm–2 at 650 °C. Symmetric cells incorporating Ni‐BCY10 cermet and BCY10 electrolyte on the one hand, and Pr2NiO4 + δ and BCY10 electrolyte on the other hand, were also characterised and area specific resistances of 0.06 Ω cm2 for the anode material and 1–2 Ω cm2 for the cathode material were obtained at 600 °C.

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

“…Since the phase structure of Pr 2 NiO 4 at 750 °C was actually not stable, [ 299,300 ] [ 301 ] In addition to the application as a cathode for SOFCs based on oxygen ion conductors, Pr 2 NiO 4 was even more extensively applied as a cathode for SOFCs based on protonic conductors. [ 281,[302][303][304][305][306] Among the LnNi 2 O 4 (Ln = La, Pr, Nd) series, Pr 2 NiO 4 also showed the highest activity for ORR on proton conducting electrolytes. [ 303 ] Moreover, the polarization resistance, specifi cally at low frequency region, of Pr 2 NiO 4 cathode reduced by introducing water into air.…”

“…The power density of the fuel cell increased with operation temperature and reached more than 130 mW cm −2 at 650 °C. [ 302 ] Although the ORR activity of Nd 2 NiO 4 was inferior to that of Pr 2 NiO 4 material, it showed good phase stability under fuel cell operating conditions, in terms of resistances against Cr contamination and CO 2 poisoning. [307][308][309][310] Egger and coworkers investigated the long-term oxygen exchange kinetics of Nd 2 NiO 4 under H 2 O-and CO 2 -containing atmospheres at 700 °C.…”

Optimization of the Lanthanum Tungstate/Pr2NiO4 Half Cell for Application in Proton Conducting Solid Oxide Fuel Cells

“…The compatibility of the new proton conductor "La 6 (BSCF) with a view to using these materials, respectively, as electrolyte and cathode materials in proton conducting fuel cells (PC SOFC) have been recently studied [1]. The lowest value of area specific resistance (ASR) was obtained for LSM and was about 4.3 X cm 2 at 750°C in humidified air (p H 2 O = 0.023 atm).…”

“…La 6 WO 12 , recently reformulated La 28-x W 4+x O 54+3x/2 exhibits a good level of protonic conductivity and chemical stability toward acidic gases. It is therefore a potential material for use as electrolyte in proton conducting solid oxide fuel cells (PC-SOFC).…”

Структура, стабильность и термомеханические свойства Ca-замещенного Pr-=SUB=-2-=/SUB=-NiO-=SUB=-4+delta-=/SUB=-

“…По данным, представленным в литературе, наимень-шие значения поляризационного сопротивления среди слоистых никелатов также имеют катоды на основе Pr 2 NiO 4+δ [7][8][9]. Кроме того, для Pr 2 NiO 4+δ были по-лучены косвенные свидетельства наличия смешанного [10], что открывает перспективы для его использования в ТОТЭ на основе не только кислород-ионных [11], но и протонпроводящих элек- [12]. Однако остается нерешенной проблема стабильности электродов на основе слоистого никела-та празеодима.…”