Promoting High-Temperature Oxygen Evolution Reaction via Infiltration of PrCoO_3−δ Nanoparticles

Abstract

The sluggish kinetics of the oxygen evolution reaction (OER) at the anode limits the performance of CO2 electrolysis in a solid oxide electrolysis cell (SOEC). As a result, much effort has been devoted to developing efficient catalysts for OER. Herein, a composite anode is exploited by infiltrating PrCoO3−δ (PC) nanoparticles onto the surface of Pr0.5Ba0.5Co0.7Fe0.2Ti0.1O3−δ-Gd0.2Ce0.8O2−δ (PBCFT-GDC). Electrochemical measurements, in situ X-ray photoelectron spectroscopy spectra, and physicochemical characterizations indicate that the addition of PC with high electrical conductivity could expand the triple-phase boundaries and motivate the oxygen spillover at PC/PBCFT-GDC interfaces, which further boosts the OER activity and CO2 electrolysis performance. With the PC infiltration amount increasing from 0 to 9 wt %, the maximum current density of 1.43 A cm–2 at 1.6 V and 800 °C is achieved for the SOEC with 6% PC/PBCFT-GDC anode, which is 43% higher than that of SOEC with bare PBCFT-GDC anode. This newly designed composite electrode material has a good application prospect as an active SOEC anode for CO2 electrolysis.

A/B-Site Management Strategy to Boost Electrocatalytic Overall Water Splitting on Perovskite Oxides in an Alkaline Medium

“…The Nyquist curve represents the sunken semicircle and shows the porous properties of the electrocatalyst according to the isophase elements in the equivalent circuit model. 54 Compared with other electrocatalysts, PSCR0.05 has the smallest radius, as shown in Figure S6. It shows that PSCR0.05 has the smallest charge transfer resistance R CT .…”

“…Nyquist curves and the fitted equivalent circuit model are shown in Figure e, where R s corresponds to solution impedance and R CT to charge transfer impedance. The Nyquist curve represents the sunken semicircle and shows the porous properties of the electrocatalyst according to the isophase elements in the equivalent circuit model . Compared with other electrocatalysts, PSCR0.05 has the smallest radius, as shown in Figure S6.…”

Tailoring Ion Ordering in Perovskite Oxide for High‐Temperature Oxygen Evolution Reaction

“…To further investigate the oxygen diffusion and evolution processes of PBCF x under anodic polarization, in situ O 1 s XPS spectra were collected at different conditions in Figure 3 [14] . The schematic of the measurement device is exhibited in our previous article [15] . The O 1 s spectra could be decomposed into four peaks in Figures 3a–c, which can be attributed to the lattice oxygen (O lat.…”

“…[14] The schematic of the measurement device is exhibited in our previous article. [15] The O 1s spectra could be decomposed into four peaks in Figures 3a-c, which can be attributed to the lattice oxygen (O lat. , � 528 eV), adsorbed highly oxidative oxygen species (O À /O 2 2À /O 2 À , � 530 eV), adsorbed hydroxyl groups or oxygen molecules (À OH/O 2 , � 531 eV), and adsorbed water (H 2 O, � 533 eV) from low binding energy to high binding energy, respectively.…”

Pr2Ni0.8Co0.2O4+δ impregnated La0.6Sr0.4CoO3−δ oxygen electrode for efficient CO2 electroreduction in solid oxide electrolysis cells

“…The two can be collectively referred to as adsorbed oxygen (O ads ), and the peak binding energy at 528.4 eV is attributed to lattice oxygen (O lat ). [28][29][30] The relative percentage content of O ads and O lat in LSC and PNCO 2 -LSC and the ratio between them are shown in Table 1. It can be seen from the table that the contents of O ads and O lat varied signicantly with impregnated PNCO, with the ratio of O ads to O lat increasing from 1.6 for LSC to 2.67 for PNCO 2 -LSC.…”