Low-Temperature Synthesis of Lithium Lanthanum Titanate/Carbon Nanowires for Fast-Charging Li-Ion Batteries

High Entropy Pr-Doped Hollow NiFeP Nanoflowers Inlaid on N-rGO for Efficient and Durable Electrodes for Lithium-Ion Batteries and Direct Borohydride Fuel Cells

The selection and design of new electrode materials for energy conversion and storage are critical for improved performance, cost reduction, and mass manufacturing. A bifunctional anode with high catalytic activity and extended cycle stability is crucial for rechargeable lithium-ion batteries and direct borohydride fuel cells. Herein, a high entropy novel three-dimensional structured electrode with Pr-doped hollow NiFeP nanoflowers inlaid on N-rGO was prepared via a simple hydrothermal and self-assembly process. For optimization of Pr content, three (0.1, 0.5, and 0.8) different doping ratios were investigated. A lithium-ion battery assembled with NiPr0.5 FeP/N-rGO electrode achieved an outstanding specific capacity of 1.61 Ah g-1 at 0.2 A g-1 after 100 cycles with 99.3 % Coulombic efficiencies. A prolonged cycling stability of 1.02 Ah g-1 was maintained even after 1000 cycles at 0.5 A g-1 . In addition, a full cell battery with NiPr0.5 FeP/N-rGO∥LCO (Lithium cobalt oxide) delivered a promising cycling performance of 0.52 Ah g-1 after 200 cycles at 0.15 A g-1 . Subsequently, the NiPr0.5 FeP/N-rGO electrode in a direct borohydride fuel cell showed the highest peak power density of 93.70 mW cm-2 at 60 °C. Therefore, this work can be extended to develop advanced electrode for next-generation energy storage and conversion systems.

Electrospun green-emitting La2O2CO3:Tb3+ nanofibers and La2O2CO3:Tb3+/Eu3+ nanofibers with white-light emission and color-tuned photoluminescence

Color-tuned luminescence and white-light emission materials have attracted much attention owing to their broad application prospects. Generally, Tb³⁺ and Eu³⁺ co-doped phosphors have color-tuned luminescence, but white-light emission is rarely achieved. In this work, color-tunable photoluminescence and white light emission are achieved in Tb³⁺ and Tb³⁺/Eu³⁺ doped monoclinic-phase La₂O₂CO₃ one-dimensional (1D) nanofibers synthesized by electrospinning united with succedent strictly controlling calcination procedure. The prepared samples own excellent fibrous morphology. La₂O₂CO₃:Tb³⁺ nanofibers are the superior green-emitting phosphors. To obtain 1D nanomaterials with color-tunable fluorescence, particularly those with white-light emission, Eu³⁺ ions are further selected and doped into La₂O₂CO₃:Tb³⁺ nanofibers to obtain La₂O₂CO₃:Tb³⁺/Eu³⁺ 1D nanofibers. The major emission peaks of La₂O₂CO₃:Tb³⁺/Eu³⁺ nanofibers at 487, 543, 596 and 616 nm are attributed to ⁵D₄→⁷F₆ (Tb³⁺), ⁵D₄→⁷F₅ (Tb³⁺), ⁵D₀→⁷F₁ (Eu³⁺) and ⁵D₀→⁷F₂ (Eu³⁺) energy levels transitions under 250-nm (for Tb³⁺ doping) and 274-nm (for Eu³⁺ doping) UV light excitation, respectively. At different wavelengths excitation, La₂O₂CO₃:Tb³⁺/Eu³⁺ nanofibers with excellent stability achieve color-tuned fluorescence and white-light emission with the help of energy transfer from Tb³⁺ to Eu³⁺ and tuning the doping concentration of Eu³⁺ ions. Formative mechanism and fabrication technique of La₂O₂CO₃:Tb³⁺/Eu³⁺ nanofibers are advanced. The design concept and manufacturing technique developed in this work may offer fresh insights for synthesizing other 1D nanofibers doped with rare earth ions to tune emitting fluorescent colors.

Double Perovskite La2 MnNiO6 as a High-Performance Anode for Lithium-Ion Batteries

Traditional lithium-ion batteries cannot meet the ever-increasing energy demands due to the unsatisfied graphite anode with sluggish electrochemical kinetics. Recently, the perovskite material family as anode attracts growing attention due to their advantages on specific capacity, rate capability, lifetime, and safety. Herein, a double perovskite La₂ MnNiO₆ synthesized by solid-state reaction method as a high-performance anode material for LIBs is reported. La₂ MnNiO₆ with an average operating potential of <0.8 V versus Li⁺ /Li exhibits a good rate capability. Besides, the Li|La₂ MnNiO₆ cells perform long cycle life without decay after 1000 cycles at 1C and a high cycling retention of 93% is observed after 3000 cycles at 6C. It reveals that this material maintains stable perovskite structure with cycling. Theoretical calculations further demonstrate the high electronic conductivity, low diffusion energy barrier, and structural stability of the lithiated La₂ MnNiO₆ . This study highlights the double perovskite type material as a promising anode for next-generation batteries.

Two-dimensional Layered Lithium Lanthanum Titanium Oxide/Graphene-like Composites as Electrodes for Lithium-Ion Batteries

Perovskite-structure (ABO3) Lithium Lanthanum Titanate (LixLa(2-x)/3TiO3, LLTO) is widely used in all solid state lithium ion batteries based on its high ionic conductivity. In this study, a two-dimensional LLTO nanosheet/graphene...