The Unique Rodriguez-Baker Dataon Hydrogen Storage in Graphite Nanofibers Might Be True

摘要

A new simplified method has been used of evaluation of hydrogen diffusioncharacteristics from a temperature programmed desorption spectrum (TPD peaks).Thermodynamic and diffusion characteristics of two hydrogen desorption processes(TPD peaks # II and # III) are obtained from the Atsumi H, et al. data (1988-2003) onisotropic graphite charged at 3-60 kPa and elevated temperatures, - that is used as thebase for description and interpretation of known data on hydrogen storage in novelcarbon nanomaterials with sp 2 hybridization (as in graphite).Revealing of the chemisorption nature of the hydrogen sorption processes (TPD peaksof # II and # III types) is done by the use of the 'ab initio' molecular orbital studyresults (Yang FH, et al. (2002)).Thermodynamic and diffusion characteristics of two hydrogen desorption processes(corresponding to extrapolated characteristics of TPD peaks # II and # III) are obtained(I) from the Orimo S, et al. data (1999-2003) on mechanically prepared nanocrystallinegraphite charged at 1 MPa (under ball milling), and (ii) from the Bashkin I.O., OssipyanYu.A., et al. data (2003-2004) on nanofibers charged at 9 Gpa.Thermodynamic and diffusion characteristics of three hydrogen desorption processes('peak' # V (extremely anomalous), and two TPD peaks of # II and # III types) areobtained from the Rodriguez-Baker, et al. data (1997-1999) on nanofibers charged at～10 MPa; 'peak' # V could satisfy with the known technological requirements for thehydrogen on-board storage for fuel cell-powered non-pollution vehicles.Thermodynamic and diffusion characteristics of the hydrogen sorption process (as TPDpeak # II type) in carbon single-walled and multi-walled nanotubes are obtained fromdata of 1997-2003.A possibility is considered of revealing the physico-chemical nature and truemanifestation regimes of the hydrogen sorption process (an anomalous 'peak' # V) andits use for a radical solution of the hydrogen on-board problem.