MoS2 /NiS Yolk-Shell Microsphere-Based Electrodes for Overall Water Splitting and Asymmetric Supercapacitor.
Qing QinLulu ChenTao WeiXien LiuPublished in: Small (Weinheim an der Bergstrasse, Germany) (2018)
Rational designing of the composition and structure of electrode material is of great significance for achieving highly efficient energy storage and conversion in electrochemical energy devices. Herein, MoS2 /NiS yolk-shell microspheres are successfully synthesized via a facile ionic liquid-assisted one-step hydrothermal method. With the favorable interface effect and hollow structure, the electrodes assembled with MoS2 /NiS hybrid microspheres present remarkably enhanced electrochemical performance for both overall water splitting and asymmetric supercapacitors. In particular, to deliver a current density of 10 mA cm-2 , the MoS2 /NiS-based electrolysis cell for overall water splitting only needs an output voltage of 1.64 V in the alkaline medium, lower than that of Pt/C-IrO2 -based electrolysis cells (1.70 V). As an electrode for supercapacitors, the MoS2 /NiS hybrid microspheres exhibit a specific capacitance of 1493 F g-1 at current density of 0.2 A g-1 , and remain 1165 F g-1 even at a large current density of 2 A g-1 , implying outstanding charge storage capacity and excellent rate performance. The MoS2 /NiS- and active carbon-based asymmetric supercapacitor manifests a maximum energy density of 31 Wh kg-1 at a power density of 155.7 W kg-1 , and remarkable cycling stability with a capacitance retention of approximately 100% after 10 000 cycles.
Keyphrases
- reduced graphene oxide
- gold nanoparticles
- solid state
- highly efficient
- ionic liquid
- molecularly imprinted
- room temperature
- quantum dots
- induced apoptosis
- stem cells
- visible light
- single cell
- carbon nanotubes
- cell proliferation
- mesenchymal stem cells
- cell death
- anaerobic digestion
- high resolution
- mass spectrometry
- endoplasmic reticulum stress