Multimetallic FeCoNiOx Nanoparticles Covered with Nitrogen-Doped Graphene Layers as Trifunctional Catalysts for Hydrogen Evolution and Oxygen Reduction and Evolution
Multimetallic FeCoNiOx Nanoparticles Covered with Nitrogen-Doped Graphene Layers as Trifunctional Catalysts for Hydrogen Evolution and Oxygen Reduction and Evolution
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DOI：
10.1021/acsanm.0c01434
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发表时间：
2020-07-24
影响因子：
5.9
通讯作者：
Zhang, Sheng S.
中科院分区：
文献类型：
--
作者：
Jiang, Rongzhong;Baker, David R.;Zhang, Sheng S.
本文介绍了一种单核双壳功能材料(FeCoNiOx@NG)的合成及其催化性能。石墨烯壳层富含缺陷，这些缺陷在促进催化过程和反应物传输方面发挥了重要作用。该材料在碱性电解液中对氧还原反应(ORR)、析氧反应(OER)和析氢反应(OER)表现出高度的三官能团催化活性。催化剂的多功能催化活性归因于催化剂的多金属性。薄层尖晶石氧化物富含氧空位，提高了析氧反应的催化活性，提高了稳定性。ORR。活性和稳定性与10%的铂/碳相当，OER性能与IR黑相当。对该功能材料的应用进行了探索。设计、组装了一种以FeCoNiOx@NG为正极催化剂的锌/空气电池。锌/空气电池表现出良好的充电循环性能，这与OER/ORR催化循环的优异性能相对应。
This Article demonstrates the synthesis and catalysis of a functional material with one core and dual shells containing an alloyed FeCoNi core covered with a thin layer of spinel oxides and encapsulated in nitrogen-doped graphene layers (FeCoNiOx@NG). The graphene shell is enriched with defects that play an important role in facilitating the catalytic process and reactant transport. This material shows highly trifunctional catalytic activity for the oxygen reduction reaction (ORR), oirygen evolution reaction (OER), and hydrogen evolutiort action in an alkaline electrolyte solution. The multifunctional catalytic activity is attributed to the catalyst's multinietallic property. The thin layer of spinel oxides is enriched with oxygen vacancies that increase the catalytic activity for the oxygen evolution reaction and enhance the stability. The ORR. activity and stability is comparable to that of 10% Pt/C, and the OER performance is comparable to that of Ir-black. An application of this functional material is explored. A zinc/air battery with FeCoNiOx@NG as the cathode catalyst is designed, assembled, and tested. The zinc/air battert exhibits a good rechargeable cycling performance, which corresponds to the excellent capability of OER/ORR catalytic cycles.