Scalable Production of Few-Layer Niobium Disulfide Nanosheets via Electrochemical Exfoliation for Energy-Efficient Hydrogen Evolution Reaction
| Autor: | Yange Suo, Kostya Ostrikov, Zhiguo Zhang, Lecheng Lei, Jincheng Si, Zhongjian Li, Qiang Zheng, Hanlin Chen, Yang Hou, Chaojun Lei, Bin Yang |
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| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Materials science Oxygen evolution 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Exfoliation joint 0104 chemical sciences Catalysis Chemical engineering Water splitting General Materials Science 0210 nano-technology Nanosheet Hydrogen production |
| Zdroj: | ACS Applied Materials & Interfaces. 11:13205-13213 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | Two-dimensional (2D) niobium disulfide (NbS2) materials feature unique physical and chemical properties leading to highly promising energy conversion applications. Herein, we developed a robust synthesis technique consisting of electrochemical exfoliation under alternating currents and subsequent liquid-phase exfoliation to prepare highly uniform few-layer NbS2 nanosheets. The obtained few-layer NbS2 material has a 2D nanosheet structure with an ultrathin thickness of ∼3 nm and a lateral size of ∼2 μm. Benefiting from their unique 2D structure and highly exposed active sites, the few-layer NbS2 nanosheets drop-casted on carbon paper exhibited excellent catalytic activity for the hydrogen evolution reaction (HER) in acid with an overpotential of 90 mV at a current density of 10 mA cm–2 and a low Tafel slope of 83 mV dec–1, which are superior to those reported for other NbS2-based HER electrocatalysts. Furthermore, few-layer NbS2 nanosheets are effective as bifunctional electrocatalysts for hydrogen production by overall water splitting, where the urea and hydrazine oxidation reactions replace the oxygen evolution reaction. |
| Databáze: | OpenAIRE |
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