In acetonitrile solution that is 0.1 M in NBu 4 PF 6, the Fc + / Fc couple is + 0.641 V with respect to the normal hydrogen electrode.
2.
Any system or environment that accepts electrons from a normal hydrogen electrode is a half cell that is defined as having a positive redox potential; any system donating electrons to the hydrogen electrode is defined as having a negative redox potential.
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