Hollow core–shell NiCo2S4@MoS2 dodecahedrons with enhanced performance for supercapacitors and hydrogen evolution reaction
| Autor: | Zi-Wei Wang, Zhenquan Tan, Yu-Lan Meng, Fei-Fei Sun, Qiao-Feng Su, Xue-Zhi Song |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Chemistry Nanotechnology 02 engineering and technology General Chemistry Electrolyte Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance Catalysis Energy storage 0104 chemical sciences Nanomaterials chemistry.chemical_compound Materials Chemistry 0210 nano-technology Bifunctional Zeolitic imidazolate framework |
| Zdroj: | New Journal of Chemistry. 43:3601-3608 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/c8nj05814h |
| Popis: | The development of bifunctional electrochemically-active micro-/nanomaterials with heterostructures for both supercapacitors and hydrogen evolution reaction (HER) enables the possibility to integrate energy storage and conversion into one single system. Herein, heterostructural NiCo2S4@MoS2 materials have been successfully prepared using zeolitic imidazolate frameworks as templates, including transformation to bimetallic layered double hydroxide, and sequential sulfuration. The smart process entails an assembly of MoS2 nanosheets on NiCo2S4 nanobuilding blocks with hollow core–shell nanoarchitectures. Specifically, when tested as an electrode in a supercapacitor, it can deliver an increased specific capacitance of 860 F g−1 at a current density of 1 A g−1, superior rate capability and cyclic stability. Furthermore, the NiCo2S4@MoS2 heterostructure also efficiently electrocatalyzes the HER in an alkaline electrolyte with a low overpotential of 194 mV, a favorable HER kinetics and better long-term stability. Results of both scenarios attest to the enhanced electrochemical performance of the NiCo2S4@MoS2 heterostructure compared to its NiCo2S4 counterpart, which is attributed to the hollow porous core–shell structures, nanointerface engineering and the synergistic effect between NiCo2S4 and MoS2. This work will broaden our horizons in designing and fabricating multifunctional active materials for next generation energy storage and conversion applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|