Supporting Information Controlled synthesis of porous Co3O4-C hybrid nanosheet arrays and their application in lithium ion batteries

a Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, Sichuan, China 10 b Sichuan New Material Research Center, Mianyang,621000, China The formation of Co3O4 nanosheets (NS) is also verified by the FTIR result, as shown in Figure S1. In precursor, strong absorptions are observed in the 2850-2950 cm-1 range, corresponding to C-H bands, and at 1050-1125 cm-1, corresponding to (CH2), (C-O) bands. The precursor contains stretching vibrations bands of Co-O (519 cm-1) and Co-OH (973 cm-1). The band at 1624 cm-1 corresponds to the angular deformation of molecular water. After annealing at 450 °C for 2 h in N2 flow, the bands of the precursor disappeared and two 15 very strong peaks centered at 576 cm-1 and 672 cm-1 characteristic of spinel Co3O4. For both FTIR curves of the precursor and the obtained Co3O4, the broad band between 3440 cm-1 and 3500 cm-1, could be assigned to the OH stretching and bending modes of water and surface hydroxyl groups.