Crystal structure, electrical and electrochemical properties of Cu co-doped Pr1.3Sr0.7NiO4+ mixed ionic-electronic conductors (MIECs)

Ruddlesden–Popper-Structured (Pr0.9La0.1)2(Ni0.8Cu0.2)O4+δ: An Effective Oxygen Electrode Material for Proton-Conducting Solid Oxide Electrolysis Cells

“…At the same time, due to the doping of Cu 2+ , the lattice expansion along the cdirection promotes the transition of O 2− from the interstitial site it occupies to the equivalent site nearby, and the anisotropic thermal motion of the top oxygen causes the ion conductivity to increase. 29 Therefore, the PLNCu sample has good electronic and ionic conductivities. The maximum conductivity of PLNCu at 450 °C is 260 S cm −1 , which is higher than those for La 2 NiO 4+δ , La 1.7 Ca 0.3 NiO 4+δ , Pr 2 NiO 4+δ , Pr 1.7 Ca 0.3 NiO 4+δ , Nd 2 NiO 4+δ , and Nd 1.7 Ca 0.3 NiO 4+δ .…”

“…The lattice shrinkage along the a – b direction due to Cu 2+ doping makes the small polaron transition from Ni 3+ to Ni 2+ /Cu 2+ with lower activation energy in the (NiCu)-O layer, thereby increasing the electronic conductivity. At the same time, due to the doping of Cu 2+ , the lattice expansion along the c -direction promotes the transition of O 2– from the interstitial site it occupies to the equivalent site nearby, and the anisotropic thermal motion of the top oxygen causes the ion conductivity to increase . Therefore, the PLNCu sample has good electronic and ionic conductivities.…”

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

“…Cu 2+ doping has been found to improve electronic and ionic conduction by promoting small polaron jumping and the jump of O 2− . 127 Wang et al synthesized (Pr 0.9 La 0.1 ) 2 (Ni 0.8 Cu 0.2 )O 4+ δ (PLNCu), which showed enhanced electrical conductivity and stability in long-term tests. 128 Ai et al doped Ba to obtain a series of Pr 2− x Ba x Ni 0.6 Cu 0.4 O 4+ δ ( x = 0, 0.1, 0.2, 0.3) perovskites, which showed an increase in electronic conductivity with increasing Ba content.…”

Heterointerface Effect in Accelerating the Cathodic Oxygen Reduction for Intermediate-Temperature Solid Oxide Fuel Cells

“…In A 2 BO 4 materials, Ln 2 NiO 4+δ (Ln = La, Pr, Nd) material is the most widely studied cathode material. Pr 2 NiO 4 (PNO) had the lowest polarization resistance and the highest oxygen surface exchange coefficient (k*) and diffusion coefficient (D*) therein ( Bansod et al, 2018 ; Kim et al, 2019 ). However, its thermal stability was poor, and it was easy to decompose during operation.…”