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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Water Oxidation on Spinel NiCo2O4 Nanoneedles Anode: Microstructures, Specific Surface Character, and the Enhanced Electrocatalytic Performance
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Water Oxidation on Spinel NiCo2O4 Nanoneedles Anode: Microstructures, Specific Surface Character, and the Enhanced Electrocatalytic Performance

机译：尖晶石NiCo2O4纳米阳极上的水氧化：微观结构，比表面特征和增强的电催化性能

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摘要

Aiming to improve the electrochemical catalytic performance of the spinel NiCo2O4 as water oxidation catalyst, solvothermal method was employed in this work to fabricate NiCo2O4 directly on conductive substrate FTO as integrated anode. By simply altering the solvent in the precursor solution, NiCo2O4 with different morphology was obtained. The electrocatalytic water oxidation behavior of both NiCo2O4 nanoneedles (NNs) and NiCo2O4 nanosheets (NSs) were investigated in analytical scale, and the results showed that NiCo2O4 NNs exhibited enhanced catalytic performance with lower onset potential, larger current density, and faster kinetics in water oxidation process compared with NiCo2O4 NSs. Meanwhile, both the anodes presented excellent stability in the basic conditions which favored oxygen evolution. The reasons for the superior catalytic activity of NiCo2O4 NNs were also discussed in depth by investigating the surface elements composition and distribution, as well as the different chemical state of the surface adsorbed oxygen. It suggested that the NiCo2O4 NNs anode surface which was better hydroxylated and had more physic- and chemisorbed water was beneficial for enhanced water oxidation performance. It was believed that the present work may provide valuable experimental foundation and an exemplary method for improving the activity of water oxidation catalyst.
机译：为了提高尖晶石NiCo2O4作为水氧化催化剂的电化学催化性能，本文采用溶剂热法在导电基片FTO上直接制备NiCo2O4作为集成阳极。通过简单地改变前体溶液中的溶剂，就获得了具有不同形态的NiCo2O4。以分析规模研究了NiCo2O4纳米针（NNs）和NiCo2O4纳米片（NSs）的电催化水氧化行为，结果表明NiCo2O4 NNs表现出增强的催化性能，具有较低的起始电势，较大的电流密度和更快的水氧化动力学。与NiCo2O4 NSs比较。同时，两个阳极在有利于析氧的基本条件下均表现出优异的稳定性。通过研究表面元素的组成和分布，以及表面吸附的氧气的不同化学状态，还深入讨论了NiCo2O4 NNs具有优异催化活性的原因。这表明NiCo2O4 NNs阳极表面的羟基化程度更高，具有更多的物理和化学吸附水，对增强水的氧化性能是有利的。可以认为，本发明可以提供有价值的实验基础和提高水氧化催化剂活性的示例性方法。

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