Constructing highly active surface-nanostructured core/bi-shell La1.2Sr0.8Ni0.5Mn0.5O4+δ cathode for protonic ceramic fuel cells

Highly Efficient A- and B-Site-Doped Ruddlesden–Popper Perovskite Oxide Nd2–xSrxNi0.9Cu0.1O4+δ as a Cathode for PCFCs

“…In the Ni 2p core-level spectra (Figure b), the spin–orbit splitting shows a doublet of 2p 1/2 and 2p 3/2 excitation. Double peaks near 854.4 and 872.03 eV belong to Ni 2+ , while another group of double peaks at around 856.40 and 874.81 eV originate from Ni 3+ , and its satellite peaks located around 860.8 and 878.39 eV were also observed. − The Ni element in NSNC exists in a mixed valence state of 2 + /3 + , confirming that the introduction of Sr 2+ at the A-site can lead to extra charged point defects. To maintain the electrical neutrality of the lattice structure, Ni 2+ is oxidized to Ni 3+ to form charge compensation.…”

Ameliorating La0.5Sr1.5MnO4 with Ni-doping to enhance cathode electrocatalysis for proton-conducting solid oxide fuel cells

“…K 2 NiF 4 -type LSMN/LSMO and perovskite structured BaZr 0.1 Ce 0.7 -Y 0.2 O 3Àd (BZCY) powders were synthesized via a citric acid-nitrate gel combustion process described elsewhere in detail. 5,18 The raw materials are as follows, La 2 O 3 , Sr(NO 3 ) 3 , MnCO 3 , Ni(NO 3 ) 3 Á 6H 2 O, BaCO 3 , Zr(NO 2 ) 4 Á5H 2 O, Ce(NO 3 ) 3 Á6H 2 O, and Y(NO 4 ) 3 Á 6H 2 O. The three pure phase materials were obtained by calcining corresponding as-prepared ash-like powders at 1100, 1100 and 1000 1C for 3 h in air, and their phase structure parameters were analyzed by an X-ray diffractometer (XRD, DX-2700BH).…”

“…[1][2][3][4] However, their limited cathode electrocatalytic activity, derived from notoriously sluggish oxygen reduction reaction (ORR) kinetics, dominates the cell polarization loss and performance degradation when the operation temperature decreases. [5][6][7] Then, developing new highly catalytic active cathode materials with good durability is significant, which is also a main topic in this field.…”

Segregation and interdiffusion processes in perovskites: a review of recent advances

“…8, where there is also a deciency in the B-sublattice, which can provide a huge oxygen introduction capacity and electron mobility. 164 Layered materials characterized by cation ordering in LnBaCo 2 O 5+d undergo surface and near-surface redistribution due to segregation of the divalent cation of the alkaline earth metal. These processes can occur at the stages of solution deposition, sintering and prolonged exposure to elevated temperatures.…”

“…8, where there is also a deficiency in the B-sublattice, which can provide a huge oxygen introduction capacity and electron mobility. 164…”