One-dimensional hierarchical nanostructures of NiCo2O4, NiCo2S4 and NiCo2Se4 with superior electrocatalytic activities toward efficient oxygen evolution reaction
| Autor: | Gibaek Lee, Shrine Maria Nithya Jeghan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Tafel equation
Materials science Mechanical Engineering Oxygen evolution Sulfidation Bioengineering 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Hydrothermal circulation 0104 chemical sciences chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials Selenide Water splitting General Materials Science Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Nanotechnology. 31:295405 |
| ISSN: | 1361-6528 0957-4484 |
| DOI: | 10.1088/1361-6528/ab8667 |
| Popis: | Oxygen evolution reaction (OER), a sluggish multistep process in electrochemical water splitting, is still a challenging issue to achieve with cheap, earth-abundant non-precious and non-polluting materials. In this work, three different electrocatalysts, specifically NiCo2O4, NiCo2 S4, and NiCo2 Se4, synthesized by simple hydrothermal process, show excellent OER activity. This report not only projects OER performances but also demonstrates a modified method for the transformation of NiCo2O4 to NiCo2 S4 and NiCo2 Se4 via sulfidation and selenization reactions. The well crystalline, porous nature of NiCo2O4, NiCo2 S4, and NiCo2Se4 electrocatalysts with one dimensional (1D) structural morphology affords overpotentials of 346 mV, 309 mV and 270 mV at current density of 10 mA cm-2 in 1 M KOH. In particular, NiCo2Se4 exhibits a low overpotential as well as a smaller Tafel slope of 63 mV dec-1, leading to robust stability in alkaline conditions. The abundant active sites, large mass and size of NiCo2Se4 enhances the performance of the OER. This type of selenide-based material with low toxicity is also an advantage for eco-friendly applications. |
| Databáze: | OpenAIRE |
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