Efficient catalysts for oxygen evolution derived from cobalt-based alloy nanochains†,Catalysis Science & Technology

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Efficient catalysts for oxygen evolution derived from cobalt-based alloy nanochains†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-03-28 00:00:00 , DOI: 10.1039/c8cy00226f
Xiaotao Yuan _{1,

2,

3,

4,

5} , Xin Wang _{1,

2,

3,

4,

5} , Muhammad Sohail Riaz _{1,

2,

3,

4,

5} , Chenlong Dong _{1,

2,

3,

4,

5} , Zhe Zhang _{1,

2,

3,

4,

5} , Fuqiang Huang _{1,

2,

3,

4,

5}

Affiliation

One-dimensional nanomaterials are widely used in electrocatalysis owing to their high charge transfer efficiency. In this work, Co–Fe alloy nanochains are presented as efficient catalysts for the oxygen evolution reaction. The nanochains with uniform nanospheres coupled to each other can range up to several micrometers. A metal–metal oxide heterostructure is attained when the alloy is exposed to the air or oxidized by the electrochemical process. The metal can inject electrons into the surface oxide, which changes the work function of the oxide and improves its catalytic efficiency. Series of samples with different compositions (Co, Co7Fe3, Co5Fe5, Co3Fe7, and Fe) were prepared and the effect of Fe/Co ratio on the catalytic activity was studied. Co7Fe3 exhibits the optimal performance with an onset point of 1.50 V (vs. RHE) and an overpotential of 365 mV at 10 mA cm⁻². The nanochains also exhibit excellent stability with 92.0% current retention after a long-term chronoamperometry test. Cobalt-based alloys with other metals (Ti, Nb, and Mo) are synthesized by the same method and they have also shown promising application in the oxygen evolution reaction.

中文翻译：

钴基合金纳米链产生的高效氧气释放催化剂†

一维纳米材料由于其高的电荷转移效率而被广泛用于电催化。在这项工作中，提出了Co-Fe合金纳米链作为氧释放反应的有效催化剂。具有彼此耦合的均匀纳米球的纳米链的范围可以高达几微米。当合金暴露于空气中或被电化学过程氧化时，就会获得金属-金属氧化物的异质结构。金属可以将电子注入表面氧化物中，从而改变氧化物的功函数并提高其催化效率。制备了一系列具有不同组成（Co，Co7Fe3，Co5Fe5，Co3Fe7和Fe）的样品，并研究了Fe / Co比对催化活性的影响。Co7Fe3表现出最佳性能，起始点为1.50 V（vs.RHE）和在10 mA cm ^-2时365 mV的过电势。经过长期计时电流法测试，纳米链还具有出色的稳定性，电流保持率为92.0％。钴基合金与其他金属（Ti，Nb和Mo）的合成方法也相同，它们在氧释放反应中也显示出了广阔的应用前景。

更新日期：2018-03-28

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