Honeycomb spherical metallic 1T-MoS 2 was fabricated as an efficient counter electrode (CE) for quantum dot sensitized solar cells (QDSSCs) via facile hydrothermal method using environment-friendly F127 as soft templates. Electrochemical tests show that the interface charge transfer resistance ( R ct ) of 1T-MoS 2 is only 0.66 Ω with 3% template, demonstrating its superior electrocatalytic activity for S n 2− reduction. The power conversion efficiency of QDSSCs assembled with Ti-mesh substrate MoS 2 CEs reached 6.03%. The outstanding performance is mainly ascribed to the unique morphological advantage and intrinsically excellent conductivity, catalytic activity and hydrophilicity of 1T-MoS 2 . The honeycomb spherical 1T-MoS 2 increases the specific surface area and provides rich catalytic active sites and electrolyte transport channels, also enhances the stability of 1T-MoS 2 . The experimental results reveal 1T-MoS 2 is expected to be a competitive CE material for efficient QDSSCs.
This work introduces an effective, inexpensive and large-scale production route to the fabrication of a novel honeycomb-spherical Co 3 O 4 -TiO 2 nanocomposite anode material for use in rechargeable lithium ion batteries. The microstructure and phase composition of the Co 3 O 4 -TiO 2 product were characterized systematically. The Co 3 O 4 -TiO 2 nanocomposite electrode yielded fairly high reversible capacity of ∼1000 mAh/g at 200 mA/g after 100 cycles. Moreover, the electrode exhibited extraordinary rate ability and could regain its original specific capaities as reversing to the low current densities. Meanwhile, when being applied as anode material in full cells, it still achieved remarkably improved electrochemical performance compared with traditional graphite material. Noticeably, in-situ XRD measurement verified the conversion mechanism for the Co 3 O 4 -TiO 2 electrode. The likely contributing factors to these outstanding electrochemical properties of the Co 3 O 4 -TiO 2 nanocomposite could be related to the distinctive morphology including interlaced Co 3 O 4 nanoflakes (NFs) and the TiO 2 nanoparticles (NPs), which contains superior structural stability and allows more channels for the Li + insertion/extraction reaction. This research shows that the as-prepared Co 3 O 4 -TiO 2 nanocomposite could be suitable for use as a favorable cycle performance anode material for lithium ion batteries.
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