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Ultrahigh electrocatalytic oxygen evolution by iron-nickel sulfide nanosheets/reduced graphene oxide nanohybrids with an optimized autoxidation process
- Source :
- Nano Energy. 43:300-309
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Iron-nickel-based electrocatalysts are a group of noble-metal-free and high-performance candidate for oxygen evolution reaction (OER), and autoxidation always occurs in their OER process. Autoxidation is a double-edged sword: it could in-situ generate high-catalytic activity sites to accelerate OER, but it also results in the attenuation of conductivity and the dissolution of active components. In this work, we propose a new strategy to relieve the negative impacts of autoxidation on OER through designing three-dimensional (3D) iron-nickel sulfide nanosheets/reduced graphene oxide (FeNiS2 NS/rGO) nanohybrids via a one-pot colloidal method, which enabled the well dispersion and strong coupling of FeNiS2 NS on the rGO. Such an interconnected 3D architecture could facilitate excellent electron transport, provide large amounts of active sites and prevent the dissolution of active components. The FeNiS2 NS/rGO delivered extremely low overpotentials of 270 mV and 200 mV to reach a current density of 10 mA cm−2, and rapid kinetics with Tafe slope of 38 mV dec−1 and 40 mV dec−1 for OER in 0.1 and 1.0 M KOH, respectively. Moreover, they could retain a great stability without activity loss over long-term continuous electrolysis and long-ageing time under air conditions. This work provides an efficient approach to resolve the autoxidation problem of FeNiS2 NS in the OER process and develops a promising earth-abundant OER electrocatalyst towards practical applications.
- Subjects :
- Electrolysis
Nickel sulfide
Materials science
Autoxidation
Renewable Energy, Sustainability and the Environment
Graphene
Inorganic chemistry
Oxide
Oxygen evolution
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Electrocatalyst
01 natural sciences
0104 chemical sciences
law.invention
chemistry.chemical_compound
chemistry
Chemical engineering
law
General Materials Science
Electrical and Electronic Engineering
0210 nano-technology
Nanosheet
Subjects
Details
- ISSN :
- 22112855
- Volume :
- 43
- Database :
- OpenAIRE
- Journal :
- Nano Energy
- Accession number :
- edsair.doi...........91a377d126865307f2642d68a8acca79
- Full Text :
- https://doi.org/10.1016/j.nanoen.2017.11.049