Zhaohuan Wei

Composition engineering of spinel high-entropy oxide self-supported electrodes. FeCoNiCrAl-HEO achieves excellent OER performance through enhanced orbital hybridization and a moderate d-band center.

A Ni ₃ S ₂ @FeOOH heterojunction electrocatalyst selectively enriches OH ⁻ while repelling Cl ⁻ during the OER and in situ SO ₄ ²⁻ leaching drives efficient self-reconstruction, promoting the formation of high-valence metal active sites.

M–NiFe(OH)_x are synthesized by room temperature corrosion engineering, which can operate for thousands of hours at a current density of 1000 mA cm⁻² without activity decay.

The rapid growth of renewable energy sources and the expanding market for electric vehicles (EVs) have escalated the demand for safe lithium-ion batteries (LIBs) with excellent performance. But the limitations of safety issues and energy density for LIBs continue to be obstacles to their future use. Recently, single-ion covalent-organic-framework-based (COF-based) solid electrolytes have emerged as a promising avenue to address the limitations of traditional liquid electrolytes and enhance the performance of LIBs. COFs have a porous structure and abundant electron-donating groups, enabling the construction of an available ionic conductive network. So, COFs are the subject of extensive and in-depth investigation, especially in terms of the impacts their adjustable porous structure and tunable chemistry on the research of ionic transport thermodynamics and transport kinetics. In this perspective, we present a comprehensive and significant overview of the recent development progress of single-ion COF-based solid electrolytes, highlighting their rare performance and potential applications in solid lithium batteries. This review illustrates the merits of single-ion conducting solid electrolytes and single-ion COF conductor-based solid electrolytes. Furthermore, the properties of anionic, cationic, and hybrid single-ion COF-based conducting electrolytes are discussed, and their electrochemical performance is also compared when applied in Li-ion batteries. Finally, to solve challenges in COF-based Li-ion batteries, strategies are provided to obtain a high lifespan, rate performance, and stable and safe batteries. This work is promising to offer valuable insights for researchers and the energy storage industry.

Co-modification of ZnO and KB is effective in improving the electrochemical performance of the cells. When the rate of ZnO and KB equals 6 : 3 in mass, the modified Zn//Zn and Zn//MnO₂ showed excellent electrochemical performance.

A high energy efficiency, low charging voltage cathode is of great significance for the development of non-aqueous lithium-oxygen batteries. Non-stoichiometric manganese dioxide (MnO_2-x) and chromium trioxide (Cr₂O₃) are known to have good catalytic activities for the discharging and charging processes, respectively. In this work, we prepared a cathode based on Cr₂O₃ decorated MnO_2-x nanosheets via a simple anodic electrodeposition-electrostatic adsorption-calcination process. This combined fabrication process allowed the simultaneous introduction of abundant oxygen vacancies and trivalent manganese into the MnO_2-x nanosheets, with a uniform load of a small amount of Cr₂O₃ on the surface of the MnO_2-x nanosheets. Therefore, the Cr₂O₃/MnO_2-x electrode exhibited a high catalytic effect for both discharging and charging, while providing high energy efficiency and low charge voltage. Experimental results show that the as-prepared Cr₂O₃/MnO_2-x cathode could provide a specific capacity of 6,779 mA·h·g⁻¹ with a terminal charge voltage of 3.84 V, and energy efficiency of 78%, at a current density of 200 mA·g⁻¹. The Cr₂O₃/MnO_2-x electrode also showed good rate capability and cycle stability. All the results suggest that the as-prepared Cr₂O₃/MnO_2-x nanosheet electrode has great prospects in non-aqueous lithium-oxygen batteries.