Summary of the peak potentials obtained by different electrochemical techniques.

Electrochemical techniques	Reduction peak potentials/V
	II	A	B	C	D	E	III
CV	−2.02	−1.86	−1.80	−1.71	−1.58	−1.45	−0.11
20 Hz SWV	−2.00	−1.88	−1.79	−1.68	−1.59	−1.44	−0.14