42results about How to "Increased electrochemical active sites" patented technology

The invention discloses an LDH-based supercapacitor composite electrode material, a preparation method and an application. The MnCo LDH nanowire array based on nickel foam was first prepared by hydrothermal method; then the MnCo LDH / C rough nanowire array based on nickel foam was prepared by calcination and carbonization; and then the NiMn ‑LDH nanosheets and MnCo‑LDH / C nanowires are combined to form a three-dimensional core-shell structure. Compared with other nanostructures such as nanoparticles, the formation of a three-dimensional core-shell nanowire array is conducive to giving full play to its electrochemical activity; the composite material is used as a super When the capacitor electrode material is applied, it can be used as a pseudocapacitive electrode material with high specific capacitance and rate charge and discharge performance; at the same time, it can also be used as anode material for supercapacitor devices with high energy density.

The invention provides a preparation method of a composite electrode material. The preparation method comprises the following steps of performing mixing on soluble divalent nickel salt, soluble divalent cobalt salt, hexamethylene tetramine, lanthanum manganate and a solvent to obtain a mixed liquid; adding foamy nickel into the mixed liquid to be subjected to a hydrothermal reaction to obtain a precursor; and performing drying and annealing on the precursor in sequence to obtain the composite electrode material. A core-shell nanometer flower structure is grown on the conductive substrate foamynickel to be directly used as an electrode, so that use of a conductive agent and a binder in the conventional coating method can be avoided, and extra contact resistance is lowered; and through a synergistic effect of NiCo<2>O<4> and LaMnO<3>, the potential window is expanded and the energy density of a supercapacitor is improved.

The invention provides a modified sepiolite modified electrode and a preparation method and application thereof. The preparation method specifically comprises the steps that sepiolite raw ores are subjected to nitrogen-doped carbon modification with glucose as a carbon source and ethidene diamine as a nitrogen source, and then the specific area is increased through HF etching and HCl acidizing; and finally, in-situ Ag doping is conducted, and thus the novel sea-urchin-shaped Cu2O modified sepiolite modified electrode is obtained. Through the methods of nitrogen-doped carbon modification, HF etching, Cu2O assembling, Ag doping and the like, the specific area of a material is increased, electrical conductivity is improved, and thus the electrochemical property is significantly improved; andthe modified sepiolite modified electrode has rapid response to the H2O2 concentration, the low application potential is -0.45 V, the wide detection range is 1.0*10<-6>-3.295*10<-3> M, the low detection limit is 2.0*10<-8> M, and meanwhile, the modified sepiolite modified electrode has the advantages of repeatability, reproducibility, good stability, high anti-jamming capability and the like, andhas quite wide application prospects.