Supporting Information

Supercapacitor Electrode of Nano-Co3O4 Decorated with Gold

Nanoparticles via In-Situ Reduction Method

Yongtao Tan, Ying Liu, Lingbin Kong, Long Kang, Fen Ran*State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, P. R. China*Corresponding author: Fen Ran (ranfen@163.com; or ranfen@lut.cn)

Figure S1 XPS spectra of Co3O4 and AuNP/nano-Co3O4

Figure S2 CV and GCD curves of nano-Co3O4

Figure S3 GCD curves of AuNP/nano-Co3O4

Figure S4 The equivalent circuit

Table S1 Fitted equivalent circuit elements of samples

Sample Rs(Ω) Cdl(F) Rct(Ω) CF(F)

Nano-Co3O4 0.846 0.0021 0.323 0.262AuNP/nano-Co3O4 0.724 0.0023 0.311 0.305

Figure S5 XRD patterns of AuNP/nano-Co3O4 with different Au nanoparticles content

Figure S6 CV and GCD of AC // AC device

Figure S7 CV and GCD of nano-Co3O4 // AC device (0~1.4 V)

Figure S8 CV (0~1.6 V) and GCD (0~1.5 V) of nano-Co3O4 // AC device

Figure S9 CV and GCD of AuNP/nano-Co3O4 // AC device (0~1.4 V)

Figure S10 SCs of the devices tested at different current density