Demonstrating the potential of yttrium-doped barium zirconate electrolyte for high-performance fuel cells
- Demonstrating the potential of yttrium-doped barium zirconate electrolyte for high-performance fuel cells
- 김병국; 이종호; 손지원; 홍종섭; 김동환; 배기호; 장동영; 최형종; 심준형
- Proton conducting ceramic fuel cell; Barium Zirconate; Thin film; multi-scale-architecturing
- Issue Date
- Nature Communications
- VOL 8-14553-9
- In reducing the high operating temperatures (≥800  °C) of solid-oxide fuel cells, use of protonic ceramics as an alternative electrolyte material is attractive due to their high conductivity and low activation energy in a low-temperature regime (≤600  °C). Among many protonic ceramics, yttrium-doped barium zirconate has attracted attention due to its excellent chemical stability, which is the main issue in protonic-ceramic fuel cells. However, poor sinterability of yttrium-doped barium zirconate discourages its fabrication as a thin-film electrolyte and integration on porous anode supports, both of which are essential to achieve high performance. Here we fabricate a protonic-ceramic fuel cell using a thin-film-deposited yttrium-doped barium zirconate electrolyte with no impeding grain boundaries owing to the columnar structure tightly integrated with nanogranular cathode and nanoporous anode supports, which to the best of our knowledge exhibits a record high-power output of up to an order of magnitude higher than those of other reported barium zirconate-based fuel cells.
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