Figure 5. Relationship between ∆GH* and φ on (A) M-N4-CNT(4, 4); (B) M-N4-CNT(5, 5); (C) M-N4-CNT(6, 6) and (D) M-N4-CNT(7, 7). ∆GH*: Gibbs free energy of hydrogen adsorption; R2: coefficient of determination; CNT: carbon nanotube.
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