In situ grown CoS on nickel foam pre-deposited with sulphur as an efficient OER electrocatalyst,New Journal of Chemistry

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In situ grown CoS on nickel foam pre-deposited with sulphur as an efficient OER electrocatalyst
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-12-16 , DOI: 10.1039/d0nj05156j
Rui Guo _{1,

2,

3,

4,

5} , Shengqi Zhang _{1,

2,

3,

4,

6} , Hui Wen _{1,

2,

3,

4,

6} , Zhiyuan Ni _{1,

2,

3,

4} , Yan He _{1,

2,

3,

4,

6} , Tao Yu _{1,

2,

3,

4,

6} , Junhua You _{1,

4,

7,

8}

Affiliation

CoS-related catalysts usually have good OER activity, but require very complicated preparation processes, so the corresponding mechanism analysis will proceed with difficulty. In this work, a NiCo-150 composite catalyst is prepared via a simple two-step electrodeposition method with an outstanding OER performance of 145 mV@10 mA cm⁻² and 337 mV@50 mA cm⁻². The Ni-150 composite catalyst shows a good OER performance, but the OER performance is further improved after electrodepositing CoS, and is better than that of a simple CoS/NF composite catalyst. The experimental results show that this pre-deposition in situ growth technique effectively reduces the internal resistance of the electrochemical process and significantly increases the electrochemically active sites by controlling the morphology. In order to explain the catalytic mechanism, the valence changes of Co, Ni, and S were detected by XAS measurements. The results show that the Co ion may be the most important active center.

中文翻译：

在硫预沉积的泡沫镍上原位生长CoS作为有效的OER电催化剂

与CoS有关的催化剂通常具有良好的OER活性，但需要非常复杂的制备过程，因此将难以进行相应的机理分析。在这项工作中，通过简单的两步电沉积方法制备了NiCo-150复合催化剂，其出色的OER性能为145 mV @ 10 mA cm ^-2和337 mV @ 50 mA cm ^-2。Ni-150复合催化剂具有良好的OER性能，但电沉积CoS后的OER性能得到进一步提高，并且比简单的CoS / NF复合催化剂更好。实验结果表明，这种预沉积原位生长技术有效地降低了电化学过程的内阻，并通过控制形态来显着增加了电化学活性位。为了解释催化机理，通过XAS测量检测了Co，Ni和S的化合价变化。结果表明，Co离子可能是最重要的活性中心。

更新日期：2021-01-12

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