EIS fitting results.

Solution	Time (h)	C 1 (μF cm−2)	CPE1−n	R ct (Ω cm2)	C 2 (μF cm−2)	CPE2−n	R f (Ω cm2)	R t (Ω cm2)
Blank	1	87.9	0.87	22 745	—	—	—	22 745
	6	97.8	0.86	13 883	—	—	—	13 883
	24	111.8	0.83	9656	—	—	—	9656
	48	122.7	0.83	8613	—	—	—	8613
	72	123.4	0.83	1313	905.7	0.60	6176	7489
	168	153.2	0.81	763	2138.1	0.64	4706	5469
With WKI	1	384.9	0.80	295 400	—	—	—	295 400
	6	139.1	0.79	32 013	—	—	—	32 013
	24	130.9	0.78	25 073	—	—	—	25 073
	48	120.6	0.74	23 933	—	—	—	23 933
	72	122.8	0.72	20 524	—	—	—	20 524
	168	75.1	0.68	64 440	—	—	—	64 440