Synergistic effects of A-site deficiency and anion doping on Pr0.4Sr0.6Ni0.2Fe0.7Mo0.1O3 cathode for H2O electrolysis and CO2 electrolysis

In this work, a strategy of A-site deficiency and F-doping was proposed to prepare Pr 0.4 Sr 0.55 Ni 0.2 Fe 0.7 Mo 0.1 F 0.1 O 2.9 (PSNFMF) cathode. Compared with the reduced Pr 0.4 Sr 0.6 Ni 0.2 Fe 0.7 Mo 0.1 O 3 (R-PSNFM), the reduced PSNFMF facilitate the exsolution reaction and generate more oxygen vacancies . Moreover, at 800 °C, the chemical oxygen surface exchange coefficient ( k chem ) of R-PSNFMF is 4.31 × 10 −4  cm s −1 , 21.8% higher than the value of 3.54 × 10 −4  cm s −1 for R-PSNFM, and the oxygen chemical bulk diffusion coefficient ( D chem ) of R-PSNFMF is 34.21 × 10 −5  cm 2  s −1 , 24.3% higher than the value of 27.53 × 10 −5  cm 2  s −1 for R-PSNFM, suggesting faster oxygen transport kinetics are obtained for R-PSNFMF. Meanwhile, the synergistic effect of A-site deficiency and anion doping can also promote the electrolysis of H 2 O and CO 2 . For H 2 O electrolysis, the current density of R-PSNFMF based cell at 0.4 V (vs. OCV) is −0.75 A cm −2 , 31.6% higher than the value of −0.56 A cm −2 for R-PSNFM based cell. And for CO 2 electrolysis in harsh condition at 800 °C, the current density of R-PSNFMF based cell at 0.4 V (vs. OCV) is −0.43 A cm −2 , 38.7% higher than the value of −0.31 A cm −2 for R-PSNFM based cell.