The Ammonia-Driven Phase Transition in Bulk and Nanostructured Potassium Graphite KC24


We report the synthesis of nanostructured stage-2 potassium graphite, KC24, by intercalation of turbostratic graphite nanofibers produced from an electrospun polymer, and compare its properties with exfoliated graphite-based KC24. The nanostructured KC24 sample has low crystalline order and slightly increased interlayer spacing of 8.76 Å, compared with 8.65 Å in the bulk sample, indicating minimal registration of the graphite planes. Time-resolved time-of-flight neutron diffraction on both nanostructured and bulk KC24 under ammoniation is suggestive of a more homogeneous and faster pressure-modulated phase transition to the ternary ammoniated potassium-graphite in the nanostructured material. Following ammoniation, negligible hydrogen uptake is observed at 50 K.

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Lovell, A., Kurban, Z., Stephen, M.B. et al. The Ammonia-Driven Phase Transition in Bulk and Nanostructured Potassium Graphite KC24 . MRS Online Proceedings Library 1216, 204 (2009).

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