Controllable Synthesis Of Heterostructure Nanomaterials For Their Electrochemical Property

In recent year,with the rapid development of science technology,Increasingly scarce of energy resources and the rapid increase in the demand for energy.Furthermore,environment pollution is continuously serious.One of the most effective ways to solve the energy and environment problem is to develop the high efficient and clean renewable energy.Nano materials as a kind of new energy materials,due to the unique performance of its own in thermodynamics,electrical,optical.especially in energy Storage（supercapacitor,lithium ion battery,solar cell）,it show a unique superiority compared with the traditional materials.In many energy storage devices,supercapacitors as one of the most important energy storage device,a series of advantages in high working voltage,light quality,small volume,long cycle life,fast charging-discharging and environment friendly.Therefore,in terms of energy storage has a very broad application prospects.In this paper,we successfully synthesized 3D-NiCo2O₄ @ NiMo O₄,Co₃O₄@Co MoO₄ nanowires,Flower-like NiCo2O₄ @ MnMoO₄ core-shell nanomaterials and MCo2O₄（M= Mn Fe NiCu Zn）nanowires in general method by using hydrothermal synthesis way.Such nanocomposites materials growth directly on the metal nickel foam substrate can not only directly as electrode,but also can be preparation of supercapacitor.We studied the electrochemical properties by electrochemical workstation.1.Integrated nanodevices with the capability of storing energy are widely applicable and have thus been studied extensively.To meet the demand for flexible integrated devices,asymmetric supercapacitors that simultaneously realize energy storage were fabricated by growing NiCo2O₄@NiMoO₄ hybrid nanowire on nickel foam,thus giving the positive electrode,and employing active carbon as the negative electrode.The as assembled integrated systems were characterized by an improved energy storage(areal specific capacitances of 6.30 F cm^-2 at 60 mA cm^-2 and specific capacitance up to 1242 F g^-2 at a current density of 10 mA cm^-2),enhanced power density and energy density by improving the potential window from 0 V to 1.6 V.Such flexible integrated devices might be used in smart and self-powered sensory,wearable,and portable electronics.2.In this work,hierarchical Co₃O₄@CoMoO₄ core/shell nanowire arrays on nickel foam for high-performance supercapacitors are fabricated by a facile ion exchange hydrothermal method.The Co₃O₄ nanowires are fully covered by ultrathin mesoporous CoMoO₄ nanosheets.A possible growth mechanism of the Co MoO₄ is that the molybdenum acid radical captures part Cobalt ions of the Co₃O₄ nanowires without annealing.When investigated as binder-free electrodes for supercapacitors（SCs）,such unique Co₃O₄@CoMoO₄ core/shell hybrid electrodes exhibit ultrahigh areal capacitances,which are several times larger than the pristine Co₃O₄ electrode.the electrode exhibits higher specific capacitance of 1112.51 F g-1 at a current density of 1 A g-1and excellent cycling stability（5000 cycles）.The remarkable electrochemical performance is attributed to the rational combination of two electroactive materials and the reasonable array configuration.3.In this paper,We demonstrate the design and fabrication of flower-like hierarchical NiCo2O₄@MnMoO₄ core-shell nanomaterials on nickel foam via a facile hydrothermal mathod for supercapacitor applications.The NiCo2O₄ nano-microspheres are fully covered by ultrathin mesoporous MnMoO₄ nanoflowers（NFRs）.A possible growth mechanism of the MnMoO₄ is that the molybdenum acid radical captures part Manganese ions of the MnMoO₄ NFRs.When investigated as binder-free electrodes for supercapacitors（SCs）,such unique NiCo2O₄@MnMoO₄ core/shell hybrid electrodes exhibit ultrahigh specific capacitances,which are several times larger than the pristine NiCo2O₄ electrode.the electrode exhibits higher specific capacitance of 1118 F g-1 at a current density of 1 A g-1 and excellent cycling stability（5000 cycles）.The remarkable electrochemical performance is attributed to the rational combination of two electroactive materials and the reasonable array configuration.4.energy materials sources have drawn considerable attention in recent years due to their non-renewable and wide applications.Among them,multi-heterogeneous materials with high capacity and low cost are especially attractive for supercapacitors.Recent attention has been focused on the synthesis and application of complex heterostructured nanomaterials,which can have superior electrochemical performance than single-structured materials.However,most of the Hierarchical nanostructure was via a hydrothermal synthesis process.Herein,In this work,we have for the first time fabricated a unique Hierarchical MCo2O₄（M= Mn Fe NiCu Zn）nanowires through a facile ion-exchange method.