Figure 9. Temperature cycling characteristics of Li-doped multiwall nanotubes in an H2/Ar gas mixture with dry air added to the input gas stream. The solid curve shows the cycling behavior in H2/Ar with additional N2; the N2 by itself has essentially no effect on the cycling characteristic compared with that in H2/Ar alone. The first cycle (dash-dot curve) and second cycle (dashed curve) after introducing 0.5 sccm of dry air to the input gas trace the evolution of greatly enhanced cycling magnitude. Reprinted with permission from [66], F. E. Pinkerton et al., J. Phys. Chem. B 104, 9460 (2000). © 2000, American Chemical Society.

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