Iron, Copper and Nitrogen Co‐doped Carbon with Enhanced Electrocatalytic Activity towards Oxygen Reduction,ChemElectroChem

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Iron, Copper and Nitrogen Co‐doped Carbon with Enhanced Electrocatalytic Activity towards Oxygen Reduction
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-06-25 , DOI: 10.1002/celc.202000718
Sheng Song _{1,

2,

3} , Xiaoming Zhang _{1,

2} , Xinlong Xu _{1,

2,

3} , Chuchu Wu _{1,

2,

3} , Huanqiao Li _{1,

2} , Zhangxun Xia _{1,

2} , Shansheng Yu ₄ , Suli Wang _{1,

2} , Gongquan Sun _{1,

2}

Affiliation

Iron‐nitrogen‐doped carbon (Fe‐NC) is an ideal candidate to replace Pt‐based oxygen reduction reaction (ORR) electrocatalysts due to its low cost and comparably high intrinsic activity. To further enhance the ORR performance of Fe‐NC electrocatalysts, efforts have been focused on two main methods. One is to enhance the intrinsic activity of FeN_x sites through electronic and geometric regulation, and the other is to increase the density of active sites by introducing high‐nitrogen‐containing precursors or co‐doping methods. Herein, we report a strategy to further increase the Fe loading through the introduction of a trace amount of Cu atoms. Significant enhancement of the electrocatalytic ORR property is observed in the as‐prepared Fe and Cu co‐doped electrocatalyst with superior half‐wave potential (E_1/2) in both alkaline and acid electrolyte. Experimental and theoretical study reveals that the introduction of a trace amount of Cu atoms is beneficial for the formation of FeN₄ sites, owing to the reduced formation energy. This work opens up a wide avenue to further increase the Fe loading in Fe‐NC electrocatalysts through bimetal co‐doping method.

中文翻译：

铁，铜和氮共掺杂碳具有增强的氧还原电催化活性

掺铁氮碳（Fe-NC）成本低且内在活性较高，是替代基于Pt的氧还原反应（ORR）电催化剂的理想选择。为了进一步提高Fe-NC电催化剂的ORR性能，已将精力集中在两种主要方法上。一种是通过电子和几何调节来增强FeN _x位点的固有活性，另一种是通过引入高氮前体或共掺杂方法来提高活性位点的密度。在此，我们报告了一种通过引入痕量Cu原子进一步增加Fe含量的策略。在制备的具有优异的半波电势的Fe和Cu共掺杂电催化剂中观察到电催化ORR性能的显着增强（E_1/2）在碱性和酸性电解液中。实验和理论研究表明，由于降低了形成能，引入痕量的Cu原子有利于FeN ₄位的形成。这项工作为通过双金属共掺杂方法进一步增加Fe-NC电催化剂中的Fe含量开辟了广阔的渠道。

更新日期：2020-07-29

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