TY - JOUR
T1 - Fluorination inductive effect enables rapid bulk proton diffusion in BaCo0.4Fe0.4Zr0.1Y0.1O3-δ perovskite oxide for high-activity protonic ceramic fuel cell cathode
AU - Ren, Rongzheng
AU - Yu, Xiaodan
AU - Wang, Zhenhua
AU - Xu, Chunming
AU - Song, Tinglu
AU - Sun, Wang
AU - Qiao, Jinshuo
AU - Sun, Kening
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/11/15
Y1 - 2022/11/15
N2 - Protonic ceramic fuel cells (PCFCs) have generated significant interest due to their weak temperature dependence and efficient energy conversion. However, traditional cathode materials show poor electrocatalytic activity at a low operating temperature due to their intrinsically slow proton diffusion, which is a long-standing issue that limits the output performance of PCFCs. Herein, the strategy of fluorinating a perovskite cathode is proposed for promoting proton transfer within the bulk of the cathode. This strategy is demonstrated in a fluorinated BaCo0.4Fe0.4Zr0.1Y0.1O3−δ (BCFZY) perovskite, which reveals a reduced polarization resistance and enhanced PCFC output performance, superior to those of newly reported PCFCs. Combing the experimental characterization and theoretical calculations, we found that the performance improvement was ascribed to the strong inductive effect of F−, which can increase the polarity the M−O bonding and decrease the O···H interaction, thus boosting the production of protonic defects and increasing the protonic diffusion coefficient.
AB - Protonic ceramic fuel cells (PCFCs) have generated significant interest due to their weak temperature dependence and efficient energy conversion. However, traditional cathode materials show poor electrocatalytic activity at a low operating temperature due to their intrinsically slow proton diffusion, which is a long-standing issue that limits the output performance of PCFCs. Herein, the strategy of fluorinating a perovskite cathode is proposed for promoting proton transfer within the bulk of the cathode. This strategy is demonstrated in a fluorinated BaCo0.4Fe0.4Zr0.1Y0.1O3−δ (BCFZY) perovskite, which reveals a reduced polarization resistance and enhanced PCFC output performance, superior to those of newly reported PCFCs. Combing the experimental characterization and theoretical calculations, we found that the performance improvement was ascribed to the strong inductive effect of F−, which can increase the polarity the M−O bonding and decrease the O···H interaction, thus boosting the production of protonic defects and increasing the protonic diffusion coefficient.
KW - Cathode
KW - Fluorination inductive effect
KW - Proton diffusion
KW - Protonic ceramic fuel cells
KW - Triple conducting oxides
UR - http://www.scopus.com/inward/record.url?scp=85134960838&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2022.121759
DO - 10.1016/j.apcatb.2022.121759
M3 - Article
AN - SCOPUS:85134960838
SN - 0926-3373
VL - 317
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 121759
ER -