Oxygen evolution on Co3O4 and Li-doped Co3O4 coated electrodes in an alkaline solution
Oxygen evolution on Co3O4 and Li-doped Co3O4 coated electrodes in an alkaline solution
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DOI：
10.1016/s0360-3199(98)00120-7
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发表时间：
1999-08
影响因子：
7.2
通讯作者：
C. Bocca;G. Cerisola;E. Magnone;A. Barbucci
中科院分区：
文献类型：
--
作者：
C. Bocca;G. Cerisola;E. Magnone;A. Barbucci
在 60°C、15 wt% NaOH 溶液中，研究了 Co3O4、Li 掺杂 Co3O4 和钙钛矿型氧化物 (LaNiO3) 电极上的析氧反应 (OER)。通过不同的制备技术获得了钴和锂掺杂的钴氧化物，并将其应用于化学酸洗镍板。通过X射线粉末衍射对所得相进行结构表征。在电化学老化（21 天，150 mA cm−2）之前和之后对电极进行电化学测量。研究了涂层制剂与其电催化活性之间的相关性。所研究电极的效率似乎取决于制备方法。在大多数情况下，观察到 OER 的两个塔菲尔斜率。这种行为是根据表面氧化物价态的变化来解释的。
The oxygen evolution reaction (OER) was investigated at 60°C in 15 wt% NaOH solution on Co3O4, Li-doped Co3O4and perovskite-type oxide (LaNiO3) electrodes. Cobalt and Li-doped cobalt oxides were obtained by different preparation techniques and were applied to chemically-pickled nickel plates. The obtained phases were structurally characterized by X-ray powder diffraction. The electrodes were subjected to electrochemical measurements, before and after electrochemical ageing (21 days, 150 mA cm−2). The correlation between the coating preparations and their electrocatalytic activity was investigated. The efficiency of the studied electrodes seems to depend on the preparation method. Two Tafel slopes for the OER were observed in most cases. This behaviour was interpreted on the basis of a change in the valence state of the surface oxide.