Abstract:

The Cu_1-xCo_xO(0.02≤x≤0.14) composite oxide electrodes are prepared by reactive DC magnetron sputtering. Techniques of X-ray diffraction (XRD), energy-dispersive spectrometry (EDS) and scanning electron microscope (SEM) are adopted to confirm the crystal structure, chemical composition and surface morphology of deposits. The electrochemical characteristics of deposits are further explored by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS).The XRD spectrum analysis shows that the deposits have a CuO monoclinic crystal structure without appearance of cobalt oxide isolated phase. Based on the electrochemical study, the Cu_1-xCo_xO electrode exhibits better catalytic activity than CuO and Co₃O₄ electrodes for oxygen evolution reaction (OER).The increase in OER activity of the Cu_1-xCo_xO electrode is attributed to its better catalysis, enlarged surface roughness and decreased resistance according to the results of electrochemical analysis together with SEM. Moreover, the power of 45 W (Co)-100 W (Cu) is chosen for the best conditions to prepare the deposits.

Key words:

析氧反应, 磁控溅射, 水电解

摘要：

采用直流反应磁控溅射法制备了Cu_1-xCo_xO（0.02≤x≤0.14）复合氧化物电极。利用XRD、EDS和SEM分析技术对沉积氧化物的晶体结构、化学组成及表面形貌进行了表征，并利用循环伏安、线性扫描及电化学交流阻抗对沉积氧化物电极的电化学性能进行了测试。XRD分析结果显示复合氧化物Cu_1-xCo_xO具有CuO单斜晶体结构,不存在氧化钴独立相。电化学测试结果表明Cu_1-xCo_xO复合氧化物电极对水氧化反应的催化活性远高于CuO和Co₃O₄电极，更好的催化活性、较低的电阻和高的表面粗糙度是Cu_1-xCo_xO复合氧化物电极催化活性提高的主要原因。生成最优Cu_1-xCo_xO（0.02≤x≤0.14）复合氧化物的溅射功率为45 W（Co）、100 W（Cu）。

关键词:

析氧反应, 磁控溅射, 水电解