A Comprehensive Study on Hydroxyl Multiwalled Carbon Nanotubes Used as Catalysts for VO₂⁺/VO²⁺ Reaction in Vanadium Redox Flow Battery

Table 4

Fitted parameters resulting from the equivalent circuit model.

Different electrodes	R1 (Ω·cm^2)	Q (CPE)		R2 (Ω·cm^2)	W (S·s^5·cm^2)
		Q/Y⋅(S·s^−n)^−1	N (0 < n < 1)
Pristine GF	0.40	1.19 × 10^−3	0.74	1.26	0.11
MWCNTs/GF	0.27	2.34 × 10^−3	0.86	0.16	0.32
Hydroxyl MWCNTs/GF	0.23	4.53 × 10^−3	0.94	0.14	0.44