Performance degradation of SmBaCo2O5+δ cathode induced by chromium deposition for solid oxide fuel cells

Solid oxide electrolysis cells – current material development and industrial application

“…The authors concluded that the Cr deposition was induced by the segregated BaO on the SBCO surface, leading to the formation of BaCrO 4 . 331 Similar results were observed for NdBaCo 2 O 5+ δ (NBC) and PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+ δ (BSCF), although the authors found that LNO (La 2 NiO 4+ δ )-infiltrated PBSCF improved tolerance to Cr poisoning. This result highlights the possibility of Cr-poisoning-resistive oxygen electrodes in the absence of nucleating agents (Sr, Ba, Mn).…”

“…Short-term Cr-poisoning tests of around 160 h on symmetrical cells with SFM oxygen electrodes showed Cr species poisoning the electrode surface, resulting in the formation of SrCrO 4 after the direct reaction of the Sr with Cr 2 O 3 and gaseous CrO 3 . 330 The reactivity with chromium was studied by looking at SmBaCo 2 O 5+ δ (SBC) 331 and later PrBaCo 2 O 5+ δ (PBC) 309 (Fig. 19a–h).…”

Progress in Developing LnBaCo2O5+δ as an Oxygen Reduction Catalyst for Solid Oxide Fuel Cells

“…According to Lee et al [206], the segregation originates from the dopant's elastic and electrostatic interactions with the host lattice. A slight size mismatch between the dopant and host cations could reduce this segregation, promoting a more stable cathode surface [205][206][207][208][209][210][211][212][213][214][215]. Nonetheless, the majority of research on the surface microstructure of double perovskite cathodes relies on basic sintering processes in the air, which differs significantly from actual battery operating conditions.…”

A review of Solid Oxide Fuel Cell cathode materials with respect to their resistance to the effects of chromium poisoning

“…There exist a handful of Cr-poisoning studies that relate to the LnBaCo 2 O 5+δ (Ln=Lanthanide) subset of double perovskites. Wei and co-authors first studied the reactivity of chromium with SBCO (SmBaCo 2 O 5+δ ) [246] before later studying its reactivity with PBCO (PrBaCo 2 O 5+δ ) [247]. In both instances, the formation of BaCrO 4 was observed to have a notable effect upon the electrochemical performance of the cathode.…”