Electrocatalytic reduction of oxygen on Co3O4: Effects of processing method
Electrocatalytic reduction of oxygen on Co3O4: Effects of processing method
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DOI：
10.1016/j.mset.2018.06.006
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发表时间：
2018-12
影响因子：
--
通讯作者：
H. Uskaikar;N. Shetti;Shweta J. Malode
中科院分区：
文献类型：
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作者：
H. Uskaikar;N. Shetti;Shweta J. Malode
本研究制备了用于氧还原反应的正极材料。采用肼基前驱体法合成了co3o4尖晶石氧化物。在311平面和晶格参数a = 8.06 Å衍射图中，x射线显示为立方晶体结构，相对强度为100%。通过原位前驱体法和玛瑙研钵和杵手工研磨，将这些氧化物负载在火神碳上。用SEM/EDAX对制备的Co3O4/C电极进行表征，了解其表面形貌。电化学测量采用循环伏安法和稳态极化技术。以Hg/HgO， OH−为参比电极，在碱性溶液（6 M KOH）中研究了氧还原反应。结果表明，与Pt/C相比，ORR在Co3O4/C上的活性较低，但与纯火神碳相比，ORR的活性较高。观察到光催化分解得到的Co3O4/C通过电子转移进行氧还原。
In this study, cathode materials for oxygen reduction reaction were produced. Co3O4spinel oxides were synthesized by hydrazine based precursor method. X-ray appearing for 311 plane and lattice parameter a = 8.06 Å diffraction pattern showed cubic crystalline structure with 100% relative intensity. These oxides were supported on vulcan carbon by in situ precursor method and by manually grinding in agate mortar and pestle. Prepared Co3O4/C electrodes were characterized by SEM/EDAX to understand the surface morphology. The electrochemical measurements were made using cyclic voltammetry and steady-state polarization techniques. Oxygen reduction reaction was studied in alkaline solution (6 M KOH) by using Hg/HgO, OH−as the reference electrode. The results have shown lower activity for the ORR on the Co3O4/C species compared to that on Pt/C, but higher activity compared to that of pure vulcan carbon. It is observed that oxygen reduction proceeds via 4 electron transfer for Co3O4/C obtained by photocatalytic decomposition.