The material demonstrates a specific capacitance of 844.8 C g ⁻¹ at a current density of 1 A g ⁻¹ . In addition, the hydrogen evolution reaction performance of the material is 92.7 mV at 10 mA cm ⁻² , with a Tafel slope of 147.86 mV dec ⁻¹ .

NiMoO₄ is an excellent candidate for supercapacitor electrodes, but poor cycle life, low electrical conductivity, and small practical capacitance limit its further development. Therefore, in this paper, we fabricate NiMoO₄@MnCo₂O₄ composites based on a two-step hydrothermal method. As a supercapacitor electrode, the sample can reach 3000 mF/cm² at 1 mA/cm². The asymmetric supercapacitor (ASC), NiMoO₄@MnCo₂O₄//AC, can be constructed with activated carbon (AC) as the negative electrode, the device can reach a maximum energy density of 90.89 mWh/cm³ at a power density of 3726.7 mW/cm³ and the capacitance retention can achieve 78.4% after 10,000 cycles.

High-entropy alloys have attracted widespread attention from researchers worldwide due to their unique microstructure and outstanding mechanical properties, making them a prominent focus in the field of metallurgy. Among the various high-entropy alloys, the CoCrCuNi system was among the first alloys discovered, and it has shown significant progress in development. By employing different preparation and heat treatment processes, researchers have obtained alloys with diverse performances. The addition of various alloying elements or other components can lead to pronounced variations in the properties of CoCrCuNi high-entropy alloys. This work provides a comprehensive review of recent research progress on CoCrCuNi high-entropy alloys. It covers the preparation methods, thermodynamic and kinetic simulation calculations, as well as discussions on heat treatment processes and the influence of alloying elements on the microstructure and mechanical properties of CoCrCuNi high-entropy alloys. Finally, the review concludes with a prospective analysis and predictions for the potential applications and future directions in developing novel high-entropy alloys.

This research is to use hydrothermal method to synthesize several CuCo ₂ S ₄ /NF and CuCo ₂ O ₄ /NF catalysts. The influence of urea and NH ₄ F ratio on the microstructure and HER catalytic activity of CuCo ₂ S ₄ /NF catalyst has been discussed in detail.