3D flower-like NiCo-LDH microspheres synthesized via conformal alkaline hydrolysis strategy possess superior specific capacitance and stability, and the assembled HSC exhibits prominent power/energy density and durability.

Two-component composites consisting of transition metal copper oxide (CuO) and graphite carbon nitride (g-C ₃ N ₄ ) were successfully synthesized. This CuO/g-C ₃ N ₄ displays a high reversible specific capacity (1530.4 F g ⁻¹ , 2 A g ⁻¹ ) as an anode material.

Metal organic frameworks (MOFs) have been rapidly developed in the application of electrode materials due to their controllable morphology and ultra-high porosity. In this research, flower-like layered nickel-based bimetallic MOFs microspheres with different metal central ions were synthesized by solvothermal method. Compared with Ni-MOFs, the optimization of the specific capacitance of NiCo-MOFs and NiMn-MOFs was been confirmed. For example, the specific capacitance of NiCo-MOFs can reach 882 F·g⁻¹ at 0.5 A·g⁻¹ while maintaining satisfactory cycle life (the specific capacity remains 90.1% of the initial value after 3000 charge-discharge cycles at 5 A·g⁻¹). In addition, the NiCo-MOFs//AC HSCs, which are composed of NiCo-MOFs and activated carbon (AC), achieved a maximum energy density of 18.33 Wh·kg⁻¹ at a power density of 400 W·kg⁻¹, and showed satisfactory cycle life (82.4% after 3000 cycles). These outstanding electrochemical properties can be ascribed to the synergistic effect between metal ions, the optimized conductivity, and the unique layered stacked flower structure, which provides a smooth transmission channel for electrons/ions. In addition, this research gives a general method for the application of MOFs in the field of supercapacitors.

Electromagnetic wave radiation disrupts electronic devices and threatens human health. Microwave absorbing materials are essential for addressing electromagnetic pollution and military stealth applications. Advancement of electronics creates demand for absorbers with thin thickness, light weight, wide bandwidth, and strong absorption. Conventional materials suffer from poor impedance matching and limited loss mechanisms in the Ku band. Heterojunction engineering offers solutions through control of band alignment and charge distribution. The built-in electric field serves as a core mechanism for enhancing dielectric loss. However, limitations exist in understanding of formation mechanisms of built-in electric fields in multi-interface systems. This study develops a ZnNiCo-LDH/MXene composite with coral-inspired architecture. Construction of high-density Mott-Schottky interfaces occurs through electrostatic assembly of polar semiconductor units and conductive matrices. Vertical growth of flower-like LDH on MXene extends propagation paths of electromagnetic waves. This design creates continuous networks of built-in electric fields. Enhanced charge separation and interfacial polarization result. Performance demonstrates -49.6 dB reflection loss at 1.35 mm thickness. Effective bandwidth reaches 3.4 GHz across Ku-band frequencies. Radar cross-section simulations confirm -39.57 dB·m² signal suppression. These achievements meet requirements of advanced absorbers. The work establishes a new paradigm for manipulation of built-in electric fields through multi-interface engineering.

At present, the development of novel catalysts with high activity Selective Catalytic Reduction (SCR) reaction at the low temperature is still a challenge. In this work, the authors prepare CeO₂/quasi-MIL-101 catalysts with various amounts of deposited ceria by a double-solvent method, which are characterized by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and so on. The results show that the increase of Ce content has a great influence on the catalytic property of the catalyst. The introduction of Ce can promote the conversion between Cr³⁺ and Cr⁵⁺ and increase the proportion of lattice oxygen, which improves the activity of the catalyst. However, the catalyst will be peroxidized when the content of Ce is too high, resulting in the decline of the catalytic activity. This experiment indicates that CeO₂/quasi-MIL-101 plays a significant role in the NH₃-SCR process at the low temperature when the loading of Ce is 0.5%. This work has proved the potential of this kind of material in NH₃-SCR process at the low temperature, providing help for subsequent studies.

In this paper, a core–shell structure nickel disulfide and ZIF-67 composite electrode material (NiS₂/ZIF-67) was synthesized by a two-step method. Firstly, spherical NiS₂ was synthesized by a hydrothermal method, dispersed in methanol, then reacted and coated by adding cobalt ions and 2-methylimidazole to obtain the NiS₂/ZIF-67 core–shell composite. The NiS₂/ZIF-67 composite shows a high specific capacitance (1297.9 F g⁻¹ at 1 A g⁻¹) and excellent cycling durability (retaining 110.0% after 4000 cycles at 5 A g⁻¹). Furthermore, the corresponding hybrid supercapacitor (NiS₂/ZIF-67//AC HSC) has an energy density of 9.5 W h kg⁻¹ at 411.1 W kg⁻¹ (6 M KOH) and remarkable cycling stability (maintaining 133.3% after 5000 cycles). Its excellent electrochemical performance may be due to the core–shell structure and the synergistic effect between the transition metal sulfide and metal–organic framework. These results indicate that the NiS₂/ZIF-67 composite as an electrode material with a core–shell structure has potential application in high-efficiency supercapacitors.