Table 2. The Equivalent circuit parameters deducted by fitting Nyquist plots.

Sample	L (×10−7H)	Rs (Ω)	Rct (Ω)	CPE1 (×10−3 Ω)−1	CPE2 (×10−3 Ω)−1	n1	n2
M30	5.23	1.01	0.55	0.41	50.50	0.78	0.81
M60	8.98	1.10	0.71	2.98	47.40	0.62	0.78
M90	8.33	1.48	0.92	1.89	56.00	0.67	0.76
G01	9.98	1.10	0.40	1.08	35.60	0.64	0.78
G03	3.14	1.10	0.32	0.39	32.5	0.81	0.83
G06	3.79	1.30	0.36	0.56	28.3	0.76	0.85