Structural Engineering of Cobalt‐Free Perovskite Enables Efficient and Durable Oxygen Reduction in Solid Oxide Fuel Cells

Abstract

Figure 6. a) Optimized structure and b) charge density map of BSFP perovskite.

Cobalt-Free Double Perovskite Oxide as a Promising Cathode for Solid Oxide Fuel Cells

“…In general, the oxygen-related species in the perovskite lattice play important roles in the ORR for cathode materials. , XPS is conducted to investigate the effect of Ga doping on oxygen-related species. As shown in Figure a, the O 1s spectra at binding energies from 526 to 537.5 eV are suggested to be divided into the contributions of lattice oxygen (O 2– , ∼528.6 eV), reactive oxygen species (O 2 2– and O – , ∼530.5 eV), adsorbed oxygen and hydroxyl groups (OH – and CO 3 2– , ∼531.5 eV), and adsorbed molecular water or carbonates (H 2 O, ∼ 32.5 eV) .…”

“…In general, the oxygen-related species in the perovskite lattice play important roles in the ORR for cathode materials. 15,37 XPS is conducted to investigate the effect of Ga doping on oxygen-related species. As shown in Figure 5a, the O 1s spectra at binding energies from 526 to 537.…”

Facile Approach to Enhance Activity and CO2 Resistance of a Novel Cobalt-Free Perovskite Cathode for Solid Oxide Fuel Cells

“…The cross-sectional morphology of cells and composition of elements were characterized by scanning electron microscopy (SEM, Hitachi, SU8220) equipped with an energy-dispersive X-ray spectroscopy (EDX) detector. The oxygen nonstoichiometry at elevated temperatures was quantified using the iodometric titration method coupled with thermogravimetric analysis (TGA, Netzsch, TG 209 F3) with the detailed description presented in our previous study . As for a bar-shaped dense specimen with the geometric dimensions of ∼ 2 mm × 5 mm × 12 mm, the electrical conductivity was measured by the four-probe DC technique, and electrical conductivity relaxation (ECR) was utilized to survey the chemical bulk diffusion coefficient ( D chem ) and chemical surface exchange kinetics ( k chem ).…”

A Highly Efficient and Robust Bifunctional Perovskite‐Type Air Electrode with Triple‐Conducting Behavior for Low‐Temperature Solid Oxide Fuel Cells

“…In an attempt to overcome this fatal defect, significant efforts are underway to develop highly efficient alternatives for LT‐SOFCs, especially for cathode material, which is mainly responsible for overall polarization loss of cells. [ 5–7 ]…”

“…In an attempt to overcome this fatal defect, significant efforts are underway to develop highly efficient alternatives for LT-SOFCs, especially for cathode material, which is mainly responsible for overall polarization loss of cells. [5][6][7] In retrospect, numerous perovskite-type oxides with mixed ionic-electronic conducting nature have been employed for oxygen-ion conducting SOFCs (O-SOFCs), as well as proton conducting SOFCs (H-SOFCs). [8][9][10][11][12] Unlike the traditional pure electronic conductor where the reaction active sites only locate at the threephase boundary, mixed ionic-electronic conducting perovskites can extend the active area to entire phase surface, thereby achieving desirable oxygen reduction reaction (ORR) activity.…”