This tutorial review introduces different types of POPs and their classification and functions for Li-chemistry-based batteries. In situ characterization studies are also discussed to highlight their importance and applicability for POPs.

Photocatalytic water splitting was observed on black phosphorus/BiVO₄ heterostructure under visible light irradiation.

In this work, planar inorganic perovskite solar cells (PSCs) with the simple structure of glass/ITO/SnO₂/CsPbI₂Br/C have been fabricated.

The optoelectronic and defect properties of mixed-halide CsPbI₂Br were explored, both α-phase and β-phase CsPbI₂Br possess better thermal and phase stability than CsPbI₃ due to the mixture of halide elements.

Fiber gas sensing techniques have been applied for a wide range of industrial applications. In this paper, the basic fiber gas sensing principles and the development of different fibers have been introduced. In various specialty fibers, hollow-core photonic crystal fibers (HC-PCFs) can overcome the fundamental limits of solid fibers and have attracted intense interest recently. Here, we focus on the review of HC-PCF gas sensing, including the light-guiding mechanisms of HC-PCFs, various sensing configurations, microfabrication approaches, and recent research advances including the mid-infrared gas sensors via hollow core anti-resonant fibers. This review gives a detailed and deep understanding of HC-PCF gas sensors and will promote more practical applications of HC-PCFs in the near future.