Halogen perovskite, a novel semiconductor material that has gained momentum in the energy sector, has also emerged in the field of electromagnetic wave (EMW) protection. Inorganic halogen perovskites are expected to perform well owing to their excellent stability and dielectric properties. In this study, a CsPbBr₃/Carbon nanotubes (CNTs) composite is designed using a convenient antisolvent method. In addition to an ultrawide absorption bandwidth (5.56 GHz) and ultrahigh absorption strength (|Reflection loss| = 51.74 dB), the composite shows excellent thermal stability and environmental tolerance. In an air environment, its EMW‐absorbing performance can be maintained at a high level at a temperature below 400 °C. CNTs build an efficient conductive network between CsPbBr₃ to enhance the conduction loss of the composite, while it brings more defects and vacancies to the surface of CsPbBr₃ to form electrical polarization centers which improving the polarization loss of the composite. This is the first study of the application of inorganic halogen perovskites in the field of EMW absorption. The excellent EMW‐absorbing performance and stability of CsPbBr₃/CNTs demonstrate the great potential of inorganic halogen perovskites in the field of EMW absorption and provide a valuable reference and feasible strategy for regulating and controlling the EMW‐absorbing performance of perovskite materials.

To cope with the explosive increase in electromagnetic radiation intensity caused by the widespread use of electronic information equipment, high-performance electromagnetic wave (EMW)-absorbing materials that can adapt to various frequency bands of EMW are also facing great demand. In this paper, CH₃NH₃PbI₃/graphene (MG) high-performance EMW-absorbing materials were innovatively synthesized by taking organic–inorganic hybrid perovskite (OIHP) with high equilibrium holes, electron mobility, and accessible synthesis as the main body, graphene as the intergranular component, and adjusting the component ratio. When the component ratio was 16:1, the thickness of the absorber was 1.87 mm, and MG’s effective EMW absorption width reached 6.04 GHz (11.96–18.00 GHz), achieving complete coverage of the Ku frequency band. As the main body of the composite, CH₃NH₃PbI₃ played the role of the polarization density center, and the defects and vacancies in the crystal significantly increased the polarization loss intensity; graphene, as a typical two-dimensional material distributed in the crystal gap, built an efficient electron transfer channel, which significantly improved the electrical conductivity loss strength. This work effectively broadened the EMW absorption frequency band of OIHP and promoted the research process of new EMW-absorbing materials based on OIPH.

With the increasing influence of electromagnetic radiation on precision instruments and organisms, there is an urgent need for research on lightweight and high-strength electromagnetic wave absorbing materials. This study has probed into a new composite absorbing material based on reduced graphene oxide (rGO)-NiMnO₃, where the like-core-shell NiMnO₃ is anchored on the rGO nanosheets to significantly improve the electromagnetic wave dissipation ability of the composite material using the inter-component dipole polarization and interface polarization. At the same time, NiMnO₃ can effectively adjust the impedance matching ratio of rGO so that electromagnetic waves can effectively enter the absorbing material. At a thickness of 3.73 mm, the maximum absorption strength of rGO-NiMnO₃ reaches −61.4 dB at 6.6 GHz; at a thickness of 2.5 mm, the adequate absorption bandwidth is 10.04–18.00 GHz, achieving a full coverage for the Ku band. As a new option for preparing lightweight and broadband electromagnetic wave absorbing materials, rGO-NiMnO₃ is an ideal material for electromagnetic wave protection.

To enhance the purification of exhaust gas, a g-C₃N₄/CeO₂/Bi₂O₃ dual type-II heterojunction photocatalysis was designed and prepared to suppress the recombination of electron–hole pairs and improve light energy utilization. The dual type-II heterojunction structure effectively reduced the bandgap (Eg) from 2.5 eV to 2.04 eV, thereby extending the light absorption of photocatalysis into the visible region. Following the design of the heterojunction, a self-cleaning process was developed and applied to asphalt pavement rut plates to evaluate its efficiency in degrading vehicle exhaust under real-road conditions. The coating was systematically characterized in terms of exhaust degradation efficiency, hardness, adhesion, water resistance, freeze–thaw durability, and skid resistance. Under 60 min of natural light irradiation, the purification efficiencies for HC, CO, CO₂, and NO_x reached 22.60%, 19.27%, 14.83%, and 50.01%, respectively. After three-repetition tests, the efficiencies remained high at 21.75%, 19.04%, 14.66%, and 49.83%, demonstrating excellent photocatalytic stability. All other road-performance indicators met the relevant China national standards. The application of this self-cleaning coating in road infrastructure presents a viable strategy for environmental remediation in transportation systems.

Perovskite solar cells (PSCs) employing three‐dimensional/two‐dimensional (3D/2D) heterostructures achieve high efficiencies but suffer from limited operational stability. Combining high‐throughput experiments with first‐principles simulations, we unveil that 2D perovskites are intrinsically susceptible to thermal degradation due to the deprotonation of spacer cations and subsequent escape of hydrogen iodide. Through artificial intelligence analysis of 278 distinct perovskites, we identify the surface electrostatic properties and molecular polarity of spacer cations as the key descriptors governing thermal resilience. Finally, we discover a bi‐cationic 2D perovskite that integrates low‐polarity phenylethylammonium with high‐polarity pentafluorophenylethylammonium (5FBA), synergistically resolving phase segregation and thermal degradation beyond what either cation can achieve alone. The bi‐cationic 3D/2D perovskite film stack shows suppressed ion migration owing to the robust interaction between 5FBA and 3D perovskite. Consequently, the resulting PSCs retain over 92% of their initial efficiency after 1500 h of thermal aging at 85°C and over 90% after 2000 h of continuous operation under 1‐Sun illumination.