Preparation And Energy Storage Of N-doped Holey Graphene

Improving the performance of energy storage technologies is one very effective way to solve environmental and energy problems in the development of human encountered,which is also the hotspot of scientific research.In this work,we present a simple and scalable route to prepare N-doped holey graphene（NhG）through one“Bottom-up”approach.The as-obtained NhG in our job owns amount of in-plane holes,high specific surface area and high nitrogen content.More importantly,the prepared NhG deliver high volumetric capacity for both lithium ion battery anode and supercapacitor electrode.The main contents of this paper are as follows:1.We proposed a simple and fast one-step strategy for the fabrication of N-CDs with good fluorescence properties.Through study of the electrochemical properties of N-CDs as lithium ion battery anode it is found that the prepared N-CDs not suitable for electrochemical energy storage material due to excessive surface functional groups and defects and poor conductivity.2.In this paper,the Solution combustion synthesis（SCS）was firstly used to prepared NhG succussfully.The as-obtained NhG owned amount of in-plane holes,a high SSA and high stack density.The as-obtained NhG owning high N content could transform to very high-density stacking structure(1.59 g cm^-3)just though drying in normal condition.3.The as-obtained NhG presented super-high volumetric capacitances for supercapacitors.Notably,the maximum gravimetric and volumetric capacitances of the NhG are 250 F g^-1 and 397 F cm^-3 for supercapacitor respectively at 0.5 A g^-1using 6 M KOH as the electrolyte in three-electrode systemis,which are highest numbers reported for carbon based material.4.We further improved the CSC route to prepare NhG,Zn（NO₃）₂·6（H₂O）was instead of Mg（NO₃）₂·6（H₂O）,glucose was instead of sucrose.The as-obtained NhG shown high N content and could transform to very high-density stacking structure(NhG-m,1.26 g cm^-3)just though drying in normal condition.5.The as-obtained Densely-stacked NhG prepared by improved SCS route deliver super-high volumetric capacitance for Li-ion battery.The electrodes based on NhG-m for lithium ion battery anode exhibited the highest volumetric capacity(1385mAh cm^-3 at 0.1 A g^-1)to the best of our knowledge in reported graphene electrodes for Li-ion batteries.