期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 37, 页码 21338-21348出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta08077e
关键词
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资金
- National Natural Science Foundation of China (NSFC) [21701088]
- Natural Science Foundation of Tianjin City [17JCYBJC41000]
- GIMRT program of the Cooperative Research and Development Center for Advanced Materials, Institute for Materials Research, Tohoku University, Japan [19K0511]
- Nankai University
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.
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