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

Published online by Cambridge University Press:  31 January 2011

Arthur Lovell ,
Zeynep Kurban ,
Stephen M. Bennington ,
Gadipelli Srinivas ,
Neal T. Skipper ,
Ron I. Smith ,
Derek Jenkins ,
Christopher A. Howard  and
Laurent Chapon
Arthur Lovell
Affiliation:
[email protected], STFC-RAL, ISIS, Didcot, United Kingdom
Zeynep Kurban
Affiliation:
[email protected], STFC-RAL, ISIS, Didcot, United Kingdom
Stephen M. Bennington
Affiliation:
[email protected], STFC-RAL, ISIS, Didcot, United Kingdom
Gadipelli Srinivas
Affiliation:
[email protected], UCL, Physics and Astronomy, London, United Kingdom
Neal T. Skipper
Affiliation:
[email protected], UCL, Physics and Astronomy, London, United Kingdom
Ron I. Smith
Affiliation:
[email protected], STFC-RAL, ISIS, Didcot, United Kingdom
Derek Jenkins
Affiliation:
[email protected], STFC-RAL, MNTC, Didcot, United Kingdom
Christopher A. Howard
Affiliation:
[email protected], UCL, Physics and Astronomy, London, United Kingdom
Laurent Chapon
Affiliation:
[email protected], STFC-RAL, ISIS, Didcot, United Kingdom
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Abstract

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.

Keywords

phase transformationintercalationnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1216: Symposium W – Hydrogen Storage Materials , 2009 , 1216-W02-04
Copyright
Copyright © Materials Research Society 2010

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