期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 615, 期 -, 页码 273-281出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.01.088
关键词
FeNi3 alloy; Graphene carbon dots; Fe sites; Synergistic effect; Oxygen evolution reaction
资金
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [20KJB150043]
- Xuzhou science and technology plan project of China [KC21294]
This study demonstrates the tuning of morphology and conductivity of non-noble metal nanocatalysts FeNi3 alloy via the introduction of graphene carbon dots (GCDs), leading to enhanced electrocatalytic performance for oxygen evolution reaction (OER). The active sites dominated by Fe and the synergistic effect of GCDs contribute to the improved OER activity.
Realizing the simultaneous morphology and electrical conductivity tuning of non-noble metal nanocatalysts is urgently desired for promoting their intrinsic activity toward oxygen evolution reaction (OER), while it is still challenging. Herein, we have demonstrated that the morphology and conductivity of FeNi3 alloy can be finely tailored via introducing the graphene carbon dots (GCDs). Benefitting from the enlarged active areas, significantly improved electrical conductivity, and strong synergistic coupling effect, the optimized FeNi3@GCDs(-10) shows extraordinary electrocatalytic performance towards OER by delivering a current density of 10 mA cm(-2) with the overpotential of 238 mV, as well as small Tafel slope of 48.7 mV dec(-1). Density functional theory (DFT) calculations reveal that Fe is the dominated active sites for boosting water dissociation. In addition, the incorporation of GCDs can also strength the adsorption of *O and lower the energy barrier for the transformation from *OH to *O, thereby optimizing the free energy of *O and greatly promoting the OER activity. (C) 2022 Elsevier Inc. All rights reserved.& nbsp;
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