Recent developments on anode materials for magnesium-ion batteries:a review

In recent years,there has been significant growth in the demand for secondary batteries,and researchers are increasingly taking an interest in the development of nextgeneration battery systems.Magnesium-ion batteries(MIBs)have been recognized as the optimal alternative to lithium-ion batteries(LIBs)due to their low cost,superior safety,and environment-friendliness.However,research and development on rechargeable MIBs are still underway as some serious problems need to be resolved.One of the most serious obstacles is the generation of an irreversible passivation layer on the surface of the Mg anode during cycling.In addition to exploring new electrolytes for MIBs,alternative anode materials for MIBs might be an effective solution to this issue.In this review,the composition and working principle of MIBs have been discussed.In addition,recent advances in the area of anode materials(metals and their alloys,metal oxides,and two-dimensional materials)available for MIBs and the corresponding Mg-storage mechanisms have also been summarized.Further,feasible strategies,including structural design,dimension reduction,and introduction of the second phase,have been employed to design high-performance MIB anodes.

Three-dimensional graphene and its composite for gas sensors

As a two-dimensional(2D)material,graphene shows excellent advantages in the field of gas sensors due to its inherent large specific surface area and unique electrical properties.However,in the practical application of gas detection,graphene sheet is easy to form irreversible agglomeration and has some limitations such as low sensitivity,long response time and slow recovery speed,which greatly reduce its gas sensing performance.As a gas sensing material,three-dimensional(3D)porous graphene has been extensively studied in recent years owing to its larger specific surface area and stable structure.In order to synthesize graphene with different three-dimensional structures,many methods have been developed.Herein,the synthesis and assembly of three-dimensional graphene and its composites were reviewed,with emphasis on the application of three-dimensional graphene and its composites in the field of gas sensors.The challenges and development prospects of three-dimensional graphene materials in the application of gas sensors were briefly described.