Ni/NiCo2O4复合电极的制备及其在碱性介质中的析氧性能

doi:10.3866/PKU.WHXB20112849

摘要/Abstract

摘要： 采用共沉淀法制备尖晶石型复合氧化物NiCo₂O₄, 然后将其加入瓦特镀镍液中, 复合电沉积了Ni/NiCo₂O₄复合镀层. 通过改变镀液pH值、阴极电流密度j_k等条件, 探索复合电沉积的最佳工艺条件. 运用扫描电子显微镜(SEM)、能谱分析(EDS)和X射线衍射(XRD)表征了复合镀层的表面形貌、颗粒含量和结构. 结果表明: 在镀液pH=6.2 和j_k=100 mA·cm^-2的条件下所得Ni/NiCo₂O₄复合镀层中, NiCo₂O₄的含量达到最高(30.6%,w). 在5 mol·L^-1的KOH溶液中, 采用循环伏安、稳态极化和电化学阻抗法研究了电极的电催化析氧性能. 与镍电极对比, Ni/NiCo₂O₄复合电极的电催化析氧性能更高, 表观活化自由能降低了53.2 kJ·mol^-1, 其析氧反应的表观交换电流密度是镍电极的7倍. 电化学阻抗谱分析表明, Ni/NiCo₂O₄复合电极在碱性溶液中析氧反应由电化学步骤和扩散步骤联合控制. 恒电位长时间电解析氧实验表明, 该Ni/NiCo₂O₄复合电极在碱性溶液中的析氧具有高的稳定性.

关键词: Ni/NiCo₂O₄, 尖晶石, 复合电沉积, 析氧电极, 稳定性能

Abstract: 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 good.

Key words: Ni/NiCo₂O₄, Spinel, Composite electrodeposition, Oxygen evolution electrode, Stability

鲍晋珍, 王森林. Ni/NiCo₂O₄复合电极的制备及其在碱性介质中的析氧性能[J]. 物理化学学报, 2011, 27(12), 2849-2856. doi: 10.3866/PKU.WHXB20112849

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 Phys. -Chim. Sin. 2011, 27(12), 2849-2856. doi: 10.3866/PKU.WHXB20112849

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB20112849

https://www.whxb.pku.edu.cn/CN/Y2011/V27/I12/2849

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Ni/NiCo₂O₄复合电极的制备及其在碱性介质中的析氧性能

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

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