We report a novel hollow porous hierarchical-architectured 0.5LiMnO·0.5LiMnCoNiO (LLO) for lithium-ion batteries (LIBs). The obtained lithium-rich layered oxides possess a large inner cavity, a permeable porous shell, and excellent structural robustness. In LIBs, such unique features are favorable for fast Li transportation and can provide sufficient contact between active materials and electrolytes, accommodate more Li, and improve the kinetics of the electrochemical reaction. The as-prepared LLO displays an extremely high initial discharge capacity (296.5 mAh g at 0.2 C), high rate capability (162.6 mAh g at 10 C), and excellent cycling stability (237.6 mAh g after 100 cycles at 0.5 C and 153.8 mAh g after 200 cycles at 10 C). These values are superior to most literature data.

A p–n heterostructured α-Fe2O3/MoS2 composite via Fe–S bonds was developed as a highly efficient CO2 photoreduction catalyst driven by visible light. The α-Fe2O3 nanoparticles were embedded between the flower-like MoS2 layers, benefitting for the uniform dispersion of themselves and meanwhile promoting the formation of 1T–MoS2. The construction of p–n heterostructure caused by Fe–S bonds led to the close contact between α-Fe2O3 and MoS2, in which α-Fe2O3 was capped with few MoS2 layers and enhanced the segregation and transportation of photoinduced electrons and holes. As a result, the 5FM photocatalyst (5 wt % α-Fe2O3 loading on MoS2) exhibited an excellent CO2 photoreduction performance, which obtained 121 μmol·h–1·g–1 of CH4 and 41 μmol·h–1·g–1 of CH3OH. During the photoreduction process, α-Fe2O3 species were the main active sites, confirmed by in situ diffuse reflectance infrared Fourier transform spectroscopy.

A simple, in situ, and one-pot hydrothermal strategy was applied for the successful manufacturing of heterostructured 2D/2D BiOCl/g-C3N4 photocatalysts, and outstanding photodegradation of Rhodamine B in the condition of visible-light irradiation over the composites emerged. The investigation of various BiOCl/g-C3N4 ratios influencing the activity implied that the optimized B2C1 (mole ratio of BiOCl/g-C3N4 with 2:1) exhibited the higher degradation efficiency than that of the rest of the composites, even higher than that of pure BiOCl and pure g-C3N4, which yielded over 90% in the initial 30 min and reached almost 100% during the whole 70 min irradiation process. Kinds of characterizations demonstrated that the enhancement of photodegradation performance was caused by the intimate contact between BiOCl and g-C3N4 to form the heterostructure, which could benefit the generation of abundant visible-light photoinduced carriers and help enhance their separation and then promote their transportation to the surface.

No abstract