Preparation of Co3O4 Nanosheet Supported on Ni Foam and Its Catalytic Performance for H2O2 Electroreduction†

doi:10.7503/cjcu20130504

Abstract

Abstract:

Ni foam supported Co₃O₄ nanosheet(Co₃O₄/Ni foam) electrode was prepared by electrodeposition, followed by a thermal treatment in air. The nanosheet was characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD), X-ray photoelectron spectrometry(XPS) and Fourier transform infrared spectrometry(FTIR). The catalytic performance of the obtained electrode for H₂O₂ electroreduction in KOH solution was evaluated by means of linear scan voltammetry and chronoamperometry. The results show a current density of 0.386 A/cm² in the solution containing 3.0 mol/L KOH and 0.4 mol/L H₂O₂ at -0.4 V(vs. Ag/AgCl). The chronoamperometric current densities remain nearly constant with a 1000 s test. The results indicate that Co₃O₄/Ni foam has considerable activity and stability for H₂O₂ electroreduction.

Key words: Co3O4, Nanosheet, Electrodeposition, H2O2, Electroreduction

CLC Number:

O646

TrendMD:

CHENG Kui, YANG Fan, YAN Peng, CAO Dianxue, YIN Jinling, WANG Guiling. Preparation of Co₃O₄ Nanosheet Supported on Ni Foam and Its Catalytic Performance for H₂O₂ Electroreduction^†[J]. Chem. J. Chinese Universities, 2014, 35(1): 110.

Figures/Tables 5

Fig.1 XRD patterns of Co3O4 nanosheet(a) and Co3O4(b)

Fig.2 SEM images of Ni foam supported Co3O4 nanosheet after calcined with different magnification(A—C) and green cobalt hydroxide precursor without calcination(D)

Fig.3 TEM(A) and HRTEM images(B) of Co3O4 nanosheet

Fig.4 XPS survey spectrum(A), Co2p XPS spectrum(B) and FTIR spectrum(C) of Co3O4 nanosheet

Fig.5 Cyclic voltammograms of Co3O4/Ni foam in 3.0 mol/L KOH at a scan rate of 50 mV/s(A), pola-rization curves for H2O2 electroreduction on the Co3O4/Ni foam electrode in different concentration of KOH+0.4 mol/L H2O2(scan rate: 10 mV/s)(B), in 3.0 mol/L KOH+different concentration of H2O2(scan rate: 10 mV/s)(C) and chronoamperometric curves for H2O2 electroreduction on the Co3O4/Ni foam electrode at different potentials in 3.0 mol/L KOH + 0.4 mol/L H2O2(D)

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Preparation of Co₃O₄ Nanosheet Supported on Ni Foam and Its Catalytic Performance for H₂O₂ Electroreduction^†

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