Hierarchical non-woven fabric NiO/TiO 2 film is prepared using a facile two-step synthesis by electrospinning and subsequent hydrothermal reaction to yield TiO 2 film decorated with NiO nanosheets. As an anode material for Li-ion batteries, the NiO/TiO 2 composite exhibits discharge and charge capacities of 1251.3 and 1284.3 mA h g À1 , with good cycling performance and rate capability.Characterization shows that the NiO nanosheets are distributed on the surface of the TiO 2 nanofibers.The total specific capacity of NiO/TiO 2 is higher than the sum of pure TiO 2 and NiO, indicating a positive synergistic effect of TiO 2 and NiO on the improvement of electrochemical performance. The results suggest that non-woven fabric NiO/TiO 2 film is a promising anode material for lithium ion batteries.
Quasi‐two‐dimensional perovskite solar cells (quasi‐2D PSCs) have drawn significant attention and are rapidly developing owing to the impressive stability of the materials and devices. However, there are no reliable guidelines for designing and selecting suitable organic spacer cations to achieve high power conversion efficiency (PCE) in quasi‐2D PSCs. Herein, the effects of the spacer cations with different substituents, i.e., benzylamine (PMA), 4‐methoxybenzylamine (p‐MeOPMA), and 4‐fluorobenzylamine (p‐FPMA), on the optoelectronic properties and device performance of quasi‐2D perovskites are systematically investigated. It is found that the spacer cations with different substituents mainly affect the crystal growth and film quality of quasi‐2D perovskites. Interestingly, quasi‐2D perovskites based on p‐MeOPMA or p‐FPMA exhibit poor crystallinity and crystal orientation, while quasi‐2D perovskite based on the unsubstituted PMA shows improved crystallinity and crystal orientation, which enables suppressed trap densities and efficient charge transport. The PMA‐based quasi‐2D perovskite (nominal n = 3) solar cell exhibits the highest PCE of 13.58%. These results demonstrate that the rational regulation of organic spacer cations plays a crucial role in improving the crystallinity and crystal orientation of perovskite films and elucidate key guiding rules for organic spacer cations for high‐performance quasi‐2D PSCs.
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