Citation: BAO Jin-Zhen, WANG Sen-Lin. Preparation of the Ni/NiCo₂O₄ Composite Electrode and Its Properties toward the Oxygen Evolution Reaction in Alkaline Media[J]. Acta Physico-Chimica Sinica, ;2011, 27(12): 2849-2856. doi: 10.3866/PKU.WHXB20112849 shu

Preparation of the Ni/NiCo₂O₄ Composite Electrode and Its Properties toward the Oxygen Evolution Reaction in Alkaline Media

1.
Department of Applied Chemistry, College of Materials Science and Engineering, Huaqiao University,Xiamen 361021, Fujian Province, P. R. China

Received Date: 20 June 2011
Available Online: 23 September 2011

A NiCo₂O₄ spinel composite oxide was obtained by co-precipitation. A Ni/NiCo₂O₄ composite coating was prepared by composite electrodeposition in a Ni plating solution by mixing with NiCo₂O₄ powder. The best plating conditions for the composite electrodeposition were investigated by changing factors such as the plating bath pH and the cathode current density j_k. The surface morphology, the NiCo₂O₄ content, and the structure of the Ni/NiCo₂O₄ composite coating were characterized by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and X-ray diffraction (XRD). As a result, the NiCo₂O₄ content in the Ni/NiCo₂O₄ composite coating was found to be the highest (30.6%, w) for a bath pH of 6.2 and a cathodic current density j_k of 100 mA·cm^-2. In 5 mol·L^-1 KOH solution the electrocatalytic properties toward the oxygen evolution reaction (OER) of the Ni/NiCo₂O₄ composite electrode was studied using cyclic voltammetry, electrochemical steady-state polarization, and electrochemical impendence spectroscopy (EIS). Compared with the Ni electrode, the electrocatalytic properties for the OER of the Ni/NiCo₂O₄ composite electrode improved greatly and the apparent activation energy was reduced to 53.2 kJ·mol^-1. The apparent exchange current density of the Ni/NiCo₂O₄ composite electrode toward the OER was 7 times as high as that of a nickel electrode. An electrochemical impendence spectroscopy analysis indicated that the oxygen evolution reaction of the Ni/NiCo₂O₄ composite electrode was co-controlled by an electrochemical step and a diffusion step. Constant potential electrolysis over extended periods for the OER shows that the stability of the Ni/NiCo₂O₄ composite electrode is od.
- Ni/NiCo₂O₄,
- Spinel,
- Composite electrodeposition,
- Oxygen evolution electrode,
- Stability
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沈阳化工大学材料科学与工程学院沈阳 110142

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Preparation of the Ni/NiCo₂O₄ Composite Electrode and Its Properties toward the Oxygen Evolution Reaction in Alkaline Media