Roles of reaction kinetics of CO₂ on a PrBaCo₂O_5.5+δ surfaces

Abstract

A symmetric PBCO/YSZ/PBCO cell (where PBCO refers to PrBaCo2O5.5+δ, and YSZ to yttria stabilized zirconia) was designed and fabricated for the investigation of the catalytic nature and reaction kinetics of CO2 on PBCO surfaces.

Design of Mixed Ionic-Electronic Materials for Permselective Membranes and Solid Oxide Fuel Cells Based on Their Oxygen and Hydrogen Mobility

“…As a result, the exchange with CO 2 proceeds 2–5 orders of magnitude faster compared to the exchange with O 2 . The CO 2 molecule is adsorbed on the surface of the oxide (Equation (33)): then interacts with a neighboring oxide anion to form the carbonate complex (Equation (34)): or with a neighboring oxygen vacancy to form the carboxylate complex (Equation (35)) [ 144 , 145 , 146 , 147 , 148 , 149 , 150 ]: or, especially at high temperatures, can dissociate to the adsorbed carbon monoxide molecule and adsorbed oxygen (Equation (36)) [ 150 , 151 , 152 , 153 ]: …”

“…or, especially at high temperatures, can dissociate to the adsorbed carbon monoxide molecule and adsorbed oxygen (Equation ( 36)) [150][151][152][153]:…”

“…In the authors' previous experimental works and reviews [55,58,69,[161][162][163][164], it has been demonstrated that temperature-programmed oxygen isotope exchange with 18 O 2 and C 18 O 2 allows one to describe the oxygen surfaceexchange mechanisms and bulk oxygen diffusion features, including the non-uniformity of bulk oxygen mobility, for many types of ceramic materials, and for SOFCs, permselective membranes and other applications. The most interesting feature of using C 18 O 2 as a 18 O-containing gas-phase reagent instead of 18 O 2 is its faster surface exchange with C 18 O 2 compared to that with 18 O 2 (as marked in Section 3.3) [58,[145][146][147][148], which generally allows one to avoid the limitation of the process by the surface exchange (i.e., to carry out the experiments in the diffusion-controlled or mixed-controlled regime) [153] and to obtain more detailed data on the oxygen bulk diffusion [58,69,161]. The comparison of various types of isotope exchange experiments with gas phase analysis is given in Table 1.…”

Design of Mixed Ionic-Electronic Materials for Permselective Membranes and Solid Oxide Fuel Cells Based on Their Oxygen and Hydrogen Mobility

“…or, especially at high temperatures, can dissociate to the adsorbed carbon monoxide molecule and adsorbed oxygen [114][115][116][117]:…”

Progress and prospects of reversible solid oxide fuel cell materials

“…(Zhang et al, 2016), La 0.3 Sr 0.7 Fe 0.7 Ti 0.3 O 3-d (Cao et al, 2016), La 0.9 Ca 0.1-Fe 0.9 Nb 0.1 O 3-d (Liu et al, 2017a(Liu et al, , 2017b, La 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3-d (LSFN) (Liu et al, 2017c;Tian et al, 2018b), La 0.8 Sr 0.2 FeO 3-d , (Yang et al, 2018b), La 0.5 Sr 0.5 Fe 0.95 V 0.05 O 3-d , (Zhou et al, 2018), Sr 2 Fe 1.5 Mo 0.5 O 6-d (SFM) (Li et al, 2016. Besides, some layered double perovskite oxides have also been used for research, such as PrBaMn 2 O 5+d (Shin et al, 2015) and PrBaCo 2 O 5+d (Xu et al, 2017). However, these two materials containing Ba element easily react with CO 2 to form BaCO 3 and their stability needs to be further verified.…”