Cyclic voltammetry potential window results in volts (V) at 400 mV s⁻¹ scan speed in 0.15 M H₂SO₄ and 1 M KOH at 200 μA threshold.

Fe at%	0.15 M H2SO4			1 M KOH
	E pa	E pc	Pot. window	E pa	E pc	Pot. window
ta-C	2.7	−2.5	5.2	1.8	−2.3	4.0
2	2.4	−1.2	3.6	1.4	−1.8	3.1
5	2.4	−1.1	3.5	1.1	−1.8	2.8
10	2.2	−1.1	3.3	1.0	−1.7	2.7