Olivaceous two-dimensional (2D) multi-layer graphene-like Co 3 O 4 thin sheets (CQU-Chen-Co-O-1) with vertically aligned nanosheet as basic building units were first prepared10 on a large scale by direct hydrothermal decomposition of the mixed aqueous solution of cobalt (II) nitrate and acetic acid without the assistance of any template or surfactant. The resulting products exhibited excellent pseudocapacitive performance with high specific capacitance of 1752 and 1862 15 F·g -1 at 5 mVs -1 and 1 A·g -1 , respectively, as well as good rate capability (63.64% capacitance surplus) and high cycling performance (99.5% surplus after 2000 cycles). 65 85Herein, a simple route for 2D multi-layer graphene-like Co 3 O 4 thin sheets (CQU-Chen-Co-O-1) with vertically

Amorphous 3D nanoflake array-assembled porous 2D cobalt–oxalate coordination polymer thin sheets (CQU-Chen-OA-Co-1-1) with excellent pseudocapacitive performance were reported for the first time.

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