When the effect of porosity was analyzed in detail in this process, both the volumes and the predominant sizes of ultramicropores were taken into consideration to account for extensive and intensive effects (based on their influence of physical adsorption of oxygen), the dependence of the number of electron transfer on the volume of ultramicropores showed an increasing trend for the nitrogen-modified N-modified) carbons (R 2 = 0.99) and a decreasing one for the non-N-modified samples (R 2 = 0.87).
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