Results for “Sr(PPd)2” | Engineering Papers

DOE OSTI2020

Materials Data on Sr(PPd)2 by Materials Project

Sr(PdP)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr2+ is bonded to eight equivalent P3- atoms to form SrP8 hexagonal bipyramids that share corners with sixteen equivalent PdP4 tetrahedra, edges with four equivalent SrP8 hexagonal bipyramids, edges with eight equivalent PdP4 tetrahedra, and faces with four equivalent SrP8 hexagonal bipyramids. All Sr–P bond lengths are 3.23 Å. Pd2+ is bonded to four equivalent P3- atoms to form PdP4 tetrahedra that share corners with eight equivalent SrP8 hexagonal bipyramids, corners with four equivalent PdP4 tetrahedra, edges with four equivalent SrP8 hexagonal bipyramids, and edges with four equivalent PdP4 tetrahedra. All Pd–P bond lengths are 2.52 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Sr2+, four equivalent Pd2+, and one P3- atom. The P–P bond length is 2.25 Å.

36 MATERIALS SCIENCE↗

DOE OSTI2024

A redox-reversible A/B-site co-doped BaFeO 3 electrode for direct hydrocarbon solid oxide fuel cells

Solid oxide fuel cells (SOFCs) can directly convert the chemical energy in fuel to electrical energy with fuel flexibility; however, the conventional nickel-based anodes face great challenges due to coking upon direct oxidation of hydrocarbon fuels and redox instability. Thus, developing new anode materials which can provide high coking resistance as well as redox stability is crucial. In this work, Ba 0.6 La 0.4 Fe 0.8 Mo 0.1 Ni 0.1 O 3-δ (BLFMN) has been synthesized in air using a sol–gel combustion method, resulting in a dual phase consisting of a cubic BLFMN main phase and scheelite BaMoO 4 (BMO 4 ) secondary phase. By heat-treating the BLFMN dual phase in H 2 at 800 °C for 5 h, a metallic nanoparticle-decorated BLFMN triple phase compound comprising cubic BLFMN, cubic BaMoO 3 (BMO 3 ) and in situ exsolved FeNi 3 alloy was obtained. BLFMN was subsequently investigated as an electrode material for La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 3-δ (LSGM) electrolyte (300 μm) supported SOFCs. Symmetrical cells using BLFMN as electrodes with the cell configuration of BLFMN//LSGM//BLFMN showed excellent redox reversibility and a peak power density (PPD) of 1.32 W cm -2 at 850 °C when using H 2 as fuel. Single cell with the cell configuration of BLFMN//LSGM//LSCF (La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ ) reached PPD of 1.61 and 0.41 W cm -2 at 850 °C when operating with H 2 and CH 4 fuel, respectively. Moreover, the single cell exhibit excellent stability (over 300 h) upon direct oxidation of hydrocarbon fuels of CH 4 and C 3 H 8 . This study indicates that BLFMN is a promising redox reversible and coking resistant anode for SOFCs.

08 HYDROGEN↗