Ba-doped Pr2NiO4+δ electrodes for proton-conducting electrochemical cells. Part 2: Transport and electrochemical properties

A new layered barium cobaltite electrode for protonic ceramic cells

“…The calculated electrode polarisation resistance, R pol , of 0.5 U cm 2 at 600 °C is very competitive with other PCC oxygen electrodes. 14,16,50,[55][56][57][58] However, a direct estimation of this value requires attention, given the electronic transport number of the electrolyte substrate. We will delve deeper into this aspect in the upcoming section.…”

“…Barium-containing compositions are interesting cathode options due to their high basicity, as discussed for doped lanthanum nickelates. 13 In this respect, Tarutin et al 14 studied Ba-doped Pr 2 NiO 4+ δ electrodes, indicating the Pr 1.8 Ba 0.2 NiO 4+ δ composition as the optimised sample when considering the transport and electrochemical properties. Notably, they observed a polarisation resistance ( R pol ) of ∼2 Ω cm 2 at 600 °C ( p H 2 O = 0.03 atm in air) using impedance spectroscopy in a symmetrical cell configuration (BaCe 0.5 Zr 0.3 Y 0.1 Yb 0.1 O 3− δ electrolyte).…”

Balancing the triple conductivity of zinc-doped cathodes for proton-conducting solid oxide fuel cells

“…15,16 Nonetheless, BFO's deciency in proton conductivity leads to a limitation in the extension of triple phase boundaries (TPBs) to the whole cathode area, thereby constraining their length and contributing to a sluggish cathode ORR rate. [17][18][19] An effective strategy involves integrating proton conductors into BFO cathode materials, thereby converting them into triple-conducting oxides, consequently boosting the rate of the ORR. 20,21 BaCeO 3−d (BCO), a frequently used electrolyte material, is commonly blended with BFO to create composite cathodes that exhibit triple-conducting capabilities.…”

Exploring the potential of triple conducting perovskite cathodes for high-performance solid oxide fuel cells: a comprehensive review

“…However, these materials face some issues such as high operating temperatures or lower open circuit voltages caused by current leakage. 6,7 An alternative option to oxygen ion conducting electrolytes is perovskite proton conducting electrolytes, which exhibit high proton conductivity when exposed to hydrogen and/or water vapor atmospheres at high temperature. 4,8 A proton migrates easily by the Grotthuss mechanism in the high temperature proton conductor lattice leading to smaller values of activation energy compared to oxygen-ion conductors, and thus larger conductivity values in the intermediate temperature range.…”