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Phase engineering of a donor-doped air electrode for reversible protonic ceramic electrochemical cells.
- Source :
- Advanced Powder Materials; Jun2024, Vol. 3 Issue 3, p1-9, 9p
- Publication Year :
- 2024
-
Abstract
- Reversible protonic ceramic electrochemical cells (R-PCECs) demonstrate great feasibility for efficient energy storage and conversion. One critical challenge for the development of R-PCECs is the design of novel air electrodes with the characteristics of high catalytic activity and acceptable durability. Here, we report a donor doping of Hf into the B-site of a cobalt-based double perovskite with a nominal formula of PrBa<subscript>0.8</subscript>Ca<subscript>0.2</subscript>Co<subscript>1.9</subscript>Hf<subscript>0.1</subscript>O<subscript>5+δ</subscript> (PBCCHf<subscript>0.1</subscript>), which is naturally reconfigured to a double perovskite PrBa<subscript>0.8-x</subscript>Ca<subscript>0.2</subscript>Co<subscript>1.9</subscript>Hf<subscript>0.1-x</subscript>O<subscript>5+δ</subscript> (PBCCHf<subscript>0.1-x</subscript>) backbone and nano-sized BaHfO<subscript>3</subscript> (BHO) on the surface of PBCCHf<subscript>0.1-x</subscript>. The air electrode demonstrates enhanced catalytic activity and durability (a stable polarization resistance of 0.269 Ω cm² for ~100 h at 600 °C), due likely to the fast surface exchange process and bulk diffusion process. When employed as an air electrode of R-PCECs, a cell with PBCCHf<subscript>0.1</subscript> air electrode demonstrates encouraging performances in modes of the fuel cell (FC) and electrolysis (EL) at 600 °C: a peak power density of 0.998 W cm<superscript>-2</superscript> and a current density of -1.613 A cm<superscript>-2</superscript> at 1.3 V (with acceptable Faradaic efficiencies). More importantly, the single-cell with PBCCHf<subscript>0.1</subscript> air electrode demonstrates good cycling stability, switching back and forth from FC mode to EL mode ±0.5 A cm<superscript>-2</superscript> for 200 h and 50 cycles. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 2772834X
- Volume :
- 3
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Advanced Powder Materials
- Publication Type :
- Academic Journal
- Accession number :
- 177921111
- Full Text :
- https://doi.org/10.1016/j.apmate.2024.100187