title: Strongly Coupled FeNi Alloys/NiFe2O4@Carbonitride Layers-Assembled Microboxes for Enhanced Oxygen Evolution Reaction.
abstract: Hydrogen produced from electrocatalytic water splitting is a promising route due to the sustainable powers derived from the solar and wind energy. However, the sluggish kinetics at the anode for water splitting makes the highly effective and inexpensive electrocatalysts desirable in oxygen evolution reaction (OER) by structure and composition modulations. Metal-organic frameworks (MOFs) have been intensively used as the templates/precursors to synthesize complex hollow structures for various energy-related applications. Herein, an effective and facile template-engaged strategy originated from bimetal MOFs is developed to construct hollow microcubes assembled by interconnected nanopolyhedron, consisting of intimately dominant FeNi alloys coupled with a small NiFe2O4oxide, which was confined within carbonitride outer shell (denoted as FeNi/NiFe2O4@NC) via one-step annealing treatment. The optimized FeNi/NiFe2O4@NC exhibits excellent electrocatalytic performances toward OER in alkaline media, showing 10 mA·cm-2at η = 316 mV, lower Tafel slope (60 mV·dec-1), and excellent durability without decay after 5000 CV cycles, which also surpasses the IrO2catalyst and most of non-noble catalysts in the OER, demonstrating a great perspective. The superior OER performance is ascribed to the hollow interior for fast mass transport, in situ formed strong coupling between FeNi alloys and NiFe2O4for electron transfer, and the protection of carbonitride layers for long stability.
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
authors.forename: Yangde
authors.initials: Y
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
authors.forename: Xiaoping
authors.identifier: http://orcid.org/0000-0003-2289-8133
authors.initials: X
authors.lastname: Dai
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
authors.forename: Mengzhao
authors.initials: M
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
authors.forename: Jiaxi
authors.initials: J
authors.lastname: Yong
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Qiao
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
authors.forename: Axiang
authors.initials: A
authors.lastname: Jin
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
authors.forename: Zhanzhao
authors.initials: Z
authors.lastname: Li
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
authors.forename: Xingliang
authors.initials: X
authors.lastname: Huang
authors.affiliation: National Institute of Metrology , Beijing 100013, China.
authors.forename: Hai
authors.initials: H
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
keywords: NiFe2O4 oxide; carbonitride layers; iron−nickel alloy; microboxes; oxygen evolution reaction