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A novel process has been introduced to synthesize an alternately stacked Ca3Co4O9/γ-Na0.66CoO2 composite with nanostructured layers and high c-axis orientation. The thickness of each layer is about 60–100 nm. The maximum power factor at 1000 K is 6.3 × 10−4 W m−1 K2, which is about 50% higher than that of conventional Ca3Co4O9 ceramics.

Graphical abstract: Topotactic synthesis of alternately stacked Ca3Co4O9/γ-Na0.66CoO2 composite with nanoscale layer structure

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