Related to three electrode system C = ∫ i(E )dE / (2v (E2 − E1 )) why do we use factor 2 in the denominator?

Can any one answer  C = ∫ idE / (2mv (E2 − E1 )).

In some papers they use factor 2 some did not use this,  why? What formula s are used for other electrode system?

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