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 (FeCoNiO_x@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), oxygen evolution reaction (OER), and hydrogen evolution reaction in an alkaline electrolyte solution. The multifunctional catalytic activity is attributed to the catalyst’s multimetallic 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 FeCoNiO_x@NG as the cathode catalyst is designed, assembled, and tested. The zinc/air battery exhibits a good rechargeable cycling performance, which corresponds to the excellent capability of OER/ORR catalytic cycles.

中文翻译：

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掺氮石墨烯层覆盖的多金属FeCoNiO _x纳米颗粒作为三功能催化剂，用于氢气释放，氧还原和释放

本文展示了一种功能材料的合成和催化作用，该材料具有一个核和一个双壳，其中包含合金化的FeCoNi核，该核被一层尖晶石氧化物薄层覆盖，并包裹在掺氮的石墨烯层中（FeCoNiO _x@NG）。石墨烯壳富含缺陷，这些缺陷在促进催化过程和反应物运输中起着重要作用。该材料对碱性电解液中的氧还原反应（ORR），氧释放反应（OER）和氢释放反应显示出高度三官能的催化活性。多功能催化活性归因于催化剂的多金属性能。尖晶石氧化物的薄层富含氧空位，氧空位增加了氧释放反应的催化活性并增强了稳定性。ORR活性和稳定性与10％Pt / C相当，OER性能与Ir-black相当。探索了这种功能材料的应用。含FeCoNiO _x的锌/空气电池设计，组装和测试@NG作为阴极催化剂。锌/空气电池具有良好的可充电循环性能，这与OER / ORR催化循环的出色能力相对应。