Measurement Methods for Surface Tension

Oxidation rate of Fe and electrochemical performance of Fe–air solid oxide rechargeable battery using LaGaO3 based oxide ion conductor

“…8,9 Recently, Xu et al reported application of tubular solid oxide fuel cells using Y 2 O 3 stabilized ZrO 2 electrolyte to redox of Fe at 1073 K 10,11 and we also proposed that the Fe-air rechargeable battery using oxide ion conductor as an electrolyte. [12][13][14] The cell using LaGaO 3 -based high oxide ion conductor showed large capacity (1163 mAh g Fe 21 ) with operating temperature at 873 K. [14][15][16] On this battery, Fe is oxidized and reduced by using H 2 /H 2 O as redox mediator and reaction of this battery proceeds with the following equations at 873 K as we reported. 15 Air electrode; 1/2O 2 + 2e…”

Ga-doped Ca12Al14O33mayenite oxide ion conductors: synthesis, defects, and electrical properties

“…[1][2][3] The oxide ion conducting electrolyte plays a key role in the working temperature of a SOFC. [4][5][6] The yttrium-stabilized ZrO 2 (YSZ), as the traditional and most widely used electrolyte in industry, can be applied only at a temperature higher than 750 C. [7][8][9] This high-working temperature raises issues concerning undesired reactions between the electrolyte and electrode materials, and also creates thermal stresses during thermal cycling. Thus, the development of new oxide ion conductors with considerably high conductivity for use in intermediate temperature (500-750 C) SOFCs is an urgent and pressing need.…”

Enthalpy of formation and thermodynamic insights into yttrium doped BaZrO3

“…28 YBZ has a perovskite structure, ABO 3 , which is ideally cubic where the A-site is usually occupied by a divalent cation (A ¼ Ba, Pb, Ca) and the B-site by a tetravalent cation (B ¼ Zr, Ce, Ti), with coordination numbers of 12 and 6, respectively. 29,30 As described, the structure does not include protons, and for their incorporation the perovskite host matrix has to be doped by a trivalent cation on the B-site which will create oxygen vacancies ðV $$ o Þ as charge compensating defects. Upon exposure to humid atmosphere, water molecule will dissociate into a hydroxyl group and a proton, which will ll an oxygen vacancy and bond to a lattice oxygen ðO Â o Þ, respectively.…”