High-entropy alloys (HEAs) have a wide range of applications due to their excellent physical and chemical properties. However, traditional synthesis routes always require high temperatures over 923 K or have high equipment requirements. Here, we developed a liquid metal gallium (Ga)-mediated strategy using only a commercial vortex mixer and metal powders to synthesize HEAs near room temperature (303 K) with low power (7 W). A variety of HEAs were successfully prepared, and the yield can be expanded to over 10 g each time. The mechanistic investigation proved that Ga continued to flow under the mechanical force and exposed fresh surfaces to contact the metal, thereby promoting the process of metal dissolution in Ga and forming HEAs. These as-prepared HEAs can be used for catalysis in electrochemical oxygen evolution reactions with low overpotential and high durability. This strategy provides an innovative method for low-energy synthesis of HEAs at room temperature.
Yingying Lei,Mingru Su,Shijie Wang,Jianchun Wu,Yu Zhou,Aichun Dou,Xueli Chen,Yunjian Liu
WNb12O33 with a ReO3 shear structure offers high lithium storage capacity but suffers from poor electron/ion transport. Hence, exploring an effective strategy aimed at enhancing intrinsic conductivity while maintaining a robust crystal framework is a significant challenge for advancing WNb12O33 as a promising anode. Here, a pseudo-Jahn–Teller effect-driven local structural distortion regulation strategy is demonstrated in WNb12O33 through quantifying Cu2+ occupancy at Nb sites in NbO6 octahedra. XRD results reveal the change in crystal structure symmetry. The DFT calculation confirms the alteration of the bandgap and Nb–O bond length, which not only exhibits enhanced electronic conductivity but also optimizes the adsorption behavior of Li+. Accordingly, the Cu2+-doped WNb12O33 offers a high reversible specific capacity of 272.6 mAh g–1, along with the Li+ diffusion coefficient promoted to 5.26 × 10–12 cm2 s–1. Moreover, it exhibits remarkable structural stability during the cycling process, featuring a reversible single-phase transition. As a result, Cu0.05WNb11.95O33 material provides high-rate capacity (147.2 mAh g–1 at 10 A g–1) and cycling performance (84.3% capacity retention at 5 A g–1 after 1000 cycles). This work provides a new perspective for the design and customization of shear structures and a basis for the rapid energy storage applications of WNb12O33.
危险品化学品经营许可证（带存储）