In-situ conversion of Ni2P/rGO from heterogeneous self-assembled NiO/rGO precursor with boosted pseudocapacitive performance  

作　　者：Ge Song Zonglin Yi Lijing Xie Zhihong Bi Qian Li Jingpeng Chen Qingqiang Kong Chengmeng Chen 

机构地区：[1]CAS Key Laboratory of Carbon Materials,Institute of Coal Chemnistry,Chinese Academy of Sciences,Taiyuan 030001,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [4]Department of Chemical Engineering,Waterloo Institute of Nanotechnology,University of Waterloo,Waterloo,Ontario N2L 3G1,Canada [5]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Bejjing 100049,China

出　　处：《Chinese Chemical Letters》2020年第6期1392-1397,F0002,共7页中国化学快报（英文版）

基　　金：supported by the DNL Cooperation Fund,CAS(No.DNL201915);National Science Foundation for Excellent Young Scholars of China(No.21922815);National Natural Science Foundation of China(No.21975275);Key Research and Development(R&D)Projects of Shanxi Province(No.201903D121007)。

摘　　要：Two-dimensional(2 D)heterostructural Ni2 P/rGO is successfully fabricated by in-situ phosphating selfassembled NiO/rGO composites and shows the enhanced electrochemical performances.In this design,the rGO sheets effectively reduce the lattice strain created during the phase transformation from NiO to Ni2 P,thereby maintaining ultrathin nanostructures of Ni2 P.The resulting Ni2 P/rGO layered heterostructure gives the composite plenty of pores or channels,good electrical conductivity and well-exposed active sites.Density functional theory(DFT)calculation further demonstrates that the Fermi energy level and electron localize of near Ni atoms in Ni2 P is higher than that of NiO,which endow Ni2 P with faster and more reversible redox reactivity in dynamic.Benefiting from their structural and compositional merits,the as-synthesized Ni2 P/rGO exhibits high specific discharge capacity and excellent rate performance.Furthermore,a hybrid supercapacitor built with Ni2 P/rGO and activated carbon shows a high specific energy of 38.6 Wh/kg at specific power of 375 W/kg.

关 键 词：2D heterostructure Ni2P/rGO Electrochemical active SUPERCAPACITOR DFT 

分 类 号：TB33[一般工业技术—材料科学与工程] TM53[电气工程—电器]