The invention relates to a hercynite composite material, a hercynite composite material modified glass-carbon electrode as well as a preparation method and application thereof. The preparation methodof the hercynite composite material comprises the following steps: mixing a ferric nitrate solution with an aluminum nitrate solution, stirring at 60-80 DEG C so as to obtain dry gel, further grindingthe dry gel into powder, and calcining so as to obtain hercynite; mixing aluminum nitrate with urea by using a graphene oxide solution, keeping the temperature at 150-200 DEG C, and further performing centrifugal treatment so as to obtain a hydrated alumina-reductive graphene oxide composite material; mixing the hercynite with the hydrated alumina-reductive graphene oxide composite material by using ethanol, and drying at 60-100 DEG C, thereby obtaining the hercynite composite material. The hercynite composite material can be adopted to modify a glass-carbon electrode, can be also applied todetection on heavy metal ions, and has the characteristics of being low in detection limit, wide in detection range, good in interference resistance, good in reproducibility, and the like.

Hercynite composite material, hercynite composite material modified glass-carbon electrode as well as preparation method and application thereof

A preparation method for a graphene/spinel LiMn2O4 nanometer composite material belongs to the field of preparation of lithium ion batteries cathode materials. Aiming at the problems that at present spinel LiMn2O4 is capable of improving the cycle performance through body doping and surface coating, but the price is reduction of specific capacity of an active material, the preparation method for the graphene/spinel LiMn2O4 nanometer composite material with high specific capacity and excellent electric cycle performance is provided. The preparation method employs a sol-gel process and a graphite oxide reduction process for preparing spinel LiMn2O4 nanocrystalline and graphene nanosheet, and employs a freeze drying process for preparing the graphene/spinel LiMn2O4 nanometer composite material. The preparation method is simple in process, and by preparing an electrode from the graphene/spinel LiMn2O4 nanometer composite material, the discharge specific capacity is 124.30 mAh*g , and the corresponding capacity maintenance rate is 96.66% after cycling is performed for 100 times, and good electrochemical performances are provided.

Preparation method for graphene/spinel LiMn2O4 nanometer composite material

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Preparation method for graphene/spinel LiMn2O4 nanometer composite material