Table 1. Electrochemical results of the various samples with different alkali etching time.

Samples	Massloading(mg cm−2)	Electrochemicalsurface area (F cm−2)	Arealcapacitance(F cm−2)	Specificcapacitance(F g−1)
Co(OH)2@CoAl LDH	19.1	1.34	13.44	744.8
Co(OH)2@PLDH-6	17.3	1.64	17.21	995.3
Co(OH)2@PLDH-12	16.9	1.91	20.30	1201.4
Co(OH)2@PLDH-18	13.7	2.33	23.75	1734
Co(OH)2@PLDH-24	13.4	2.48	21.84	1626
Co(OH)2@PLDH-48	12.2	2.61	16.45	1353.2