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Shaping triple-conducting semiconductor BaCo0.4Fe0.4Zr0.1Y0.1O3-? into an electrolyte for low-temperature solid oxide fuel cells.

ABSTRACT: Interest in low-temperature operation of solid oxide fuel cells is growing. Recent advances in perovskite phases have resulted in an efficient H+/O2-/e- triple-conducting electrode BaCo0.4Fe0.4Zr0.1Y0.1O3-? for low-temperature fuel cells. Here, we further develop BaCo0.4Fe0.4Zr0.1Y0.1O3-? for electrolyte applications by taking advantage of its high ionic conduction while suppressing its electronic conduction through constructing a BaCo0.4Fe0.4Zr0.1Y0.1O3-?-ZnO p-n heterostructure. With this approach, it has been demonstrated that BaCo0.4Fe0.4Zr0.1Y0.1O3-? can be applied in a fuel cell with good electrolyte functionality, achieving attractive ionic conductivity and cell performance. Further investigation confirms the hybrid H+/O2- conducting capability of BaCo0.4Fe0.4Zr0.1Y0.1O3-?-ZnO. An energy band alignment mechanism based on a p-n heterojunction is proposed to explain the suppression of electronic conductivity and promotion of ionic conductivity in the heterostructure. Our findings demonstrate that BaCo0.4Fe0.4Zr0.1Y0.1O3-? is not only a good electrode but also a highly promising electrolyte. The approach reveals insight for developing advanced low-temperature solid oxide fuel cell electrolytes.

SUBMITTER: Xia C 

PROVIDER: S-EPMC6461657 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Shaping triple-conducting semiconductor BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>O<sub>3-δ</sub> into an electrolyte for low-temperature solid oxide fuel cells.

Xia Chen C   Mi Youquan Y   Wang Baoyuan B   Lin Bin B   Chen Gang G   Zhu Bin B  

Nature communications 20190412 1

Interest in low-temperature operation of solid oxide fuel cells is growing. Recent advances in perovskite phases have resulted in an efficient H<sup>+</sup>/O<sup>2-</sup>/e<sup>-</sup> triple-conducting electrode BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>O<sub>3-δ</sub> for low-temperature fuel cells. Here, we further develop BaCo<sub>0.4</sub>Fe<sub>0.4</sub>Zr<sub>0.1</sub>Y<sub>0.1</sub>O<sub>3-δ</sub> for electrolyte applications by taking advantage of its high ionic  ...[more]

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