Metal-organic-framework-derived porous 3D heterogeneous NiFex/NiFe2O4@NC nanoflowers as highly stable and efficient electrocatalysts for the oxygen-evolution reaction
Metal-organic-framework-derived porous 3D heterogeneous NiFex/NiFe2O4@NC nanoflowers as highly stable and efficient electrocatalysts for the oxygen-evolution reaction
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金属有机骨架衍生的多孔3D异质NiFex/NiFe2O4@NC纳米花作为析氧反应的高度稳定和高效的电催化剂
DOI：
10.1039/c9ta08077e
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发表时间：
2019
影响因子：
11.9
通讯作者：
Zhou Zhen
中科院分区：
文献类型：
--
作者：
Zhao Jia;Zhang Xu;Liu Ming;Jiang Yi Zhan;Wang Min;Li Zhao Yang;Zhou Zhen
开发具有优异析氧反应（OER）性能的廉价电催化剂是扩大水分解化学应用的关键。然而，同时考虑活性和稳定性的催化剂通常难以制造。在此，在金属有机框架（MOF）热解后，通过简单的部分氧化过程，将异质NiFex/NiFe2O4纳米花成功嵌入具有多孔3D超结构的N掺杂石墨碳（NC）基质中。优化的多相NiFex/NiFe2O4@NC纳米花催化剂表现出较高的OER性能，在10 mA cm−2下具有262 mV的低过电势，并且在1 M KOH作为电解质中具有出色的长期稳定性（150小时），这主要归因于其固有的多相和3D多孔结构。第一性原理计算证实，与单组分催化剂相比，NiFex/NiFe2O4@NC 需要较低的过电势来促进 OER，这进一步表明该材料是一种有前途的低成本、高效 OER 电催化剂候选材料。
The development of inexpensive electrocatalysts with excellent oxygen-evolution reaction (OER) performance is the key to expanding the applications of water-splitting chemistry. However, catalysts that simultaneously take into account activity and stability are generally difficult to fabricate. Herein, heterogeneous NiFex/NiFe2O4 nanoflowers were successfully embedded in an N-doped graphitic carbon (NC) matrix with a porous 3D superstructure in a simple partial oxidation process after the pyrolysis of a metal–organic framework (MOF). The optimized heterogeneous NiFex/NiFe2O4@NC nanoflower catalyst exhibited high OER performance in terms of its low overpotential of 262 mV at 10 mA cm−2 and outstanding long-term stability (for 150 h) in 1 M KOH as the electrolyte, which are mainly ascribable to its intrinsic heterogeneous and 3D porous structure. First-principles computations confirmed that NiFex/NiFe2O4@NC requires a lower overpotential to promote OER, compared with those of single-component catalysts, which further highlights that this material is a promising low-cost and highly efficient OER electrocatalyst candidate.