Functionally Graphene-based Materials Using For Energy Storage And Conversion

Graphene has attracted increasing attention from scientists in various fields due to its uniquely physical and chemical properties.Recent research is carrying out rapidly about graphene-based supporting/active material for advanced energy storage and conversion systems.The structural regulation and functionalization of graphene are efficient strategy for improving the performance of energy storage and conversion systems.Herein,we have developed diverse of functional graphene and explore its application in energy storage and conversion systems.We have first reported the monoatomic-thick graphitic carbon nitride?g-C₃N₄?dots,which intimately contacted to the basal plane of the graphene sheet to form composite?MTCG?.The electrocatalytic activity of the MTCG in the oxygen reduction reaction is found to rival that of the commercial Pt/C catalyst in terms of the catalytic current density and half-wave potential.The density functional theory calculations confirm the catalytic improvement of the MTCG originates from the efficient reduction of OOH^-.the current work is expected to provide new insights in developing next-generation,highly efficient catalysts for the oxygen reduction reaction.We have prepared the N-doped,high density,holey graphene monolith?NHGM?anode,which prepared by shrinking the N-containing holey graphene hydrogel under drying and annealing treatment.The dense and porous microstructure of NHGM provides efficient electron and ion transport pathways as well as a high packing density(1.1 g cm^-3).Thus,the NHGM has high volumetric capacities(1052 mAhcm^-3),superior stability and high rate capability.It is worth noting that the first Coulombic efficiency of NHGM is ca.70%,which is obviously superior to that of graphene anode.This makes our graphene-based electrode material an important step toward practical applications.A new type of responsive battery with the fascinating feature of pressure perceptibility has been developed,which can spontaneously,timely and reliably control the power outputs?e.g.,current and voltage?in response to pressure changes.The device design is based on graphene-coated sponge,which serves as pressure-sensitive air cathode and endows the whole system with the capability of self-controlled energy release.The responsive batteries exhibit superior battery performance with high open-circuit voltage?1.31 V?,and competitive areal capacity of 1.25 mAhcm^-2.This work presents an important move towards next-generation intelligent energy storage devices with energy management function.