Perspective on ultrathin layered Ni-doped MoS_(2) hybrid nanostructures for the enhancement of electrochemical properties in supercapacitors  

作　　者：Kamarajar Prakash Santhanakrishnan Harish Shanmugasundaram Kamalakannan Thirumalaisamy Logu Masaru Shimomura Jayaram Archana Mani Navaneethan 

机构地区：[1]Functional Materials and Energy Devices Laboratory,Department of Physics and Nanotechnology,SRM Institute of Science and Technology,Kattankulathur,Chennai 603203,Tamil Nadu,India [2]Graduate School of Science and Technology,Shizuoka University,3-5-1 Johoku,Naka-Ku,Hamamatsu,Shizuoka 432-11,Japan [3]SPECIFIC,Materials Research Centre,Faculty of Science and Engineering,Swansea University,Swansea,United Kingdom [4]Nanotechnology Research Center,SRM Institute of Science and Technology,Kattankulathur,Chennai 603203,Tamil Nadu,India

出　　处：《Journal of Energy Chemistry》2023年第5期335-349,I0008,共16页能源化学（英文版）

摘　　要：Over the last two decades,extensive study has been done on two-dimensional Molybdenum Sulphide(MoS_(2))due to its outstanding features in energy storage applications.Although MoS_(2)has a lot of active sulphur edges,the presence of inactive surfaces leads to limit conductivity and efficiency.Hence,in this article,we aimed to promote the additional active sites by doping various weight percentages(2%,4%,6%,8%and 10%)of Nickel(Ni)into the MoS_(2)matrix by simple hydrothermal technique,and their doping effects were investigated with the help of Physio-chemical analyses.X-ray diffraction(XRD)pattern,Raman,and chemical composition(XPS)analyses were used to confirm the Ni incorporation in MoS_(2)nanosheets.Microscopic investigations demonstrated that Ni-doped MoS_(2)nanosheets were vertically aligned with enhanced interlayer spacing.Cyclic voltammetry,Galvanostatic charge-discharge,and electrochemical impedance spectroscopy investigations were used to characterize the electrochemical characteristics.The 6%Ni-doped MoS_(2)electrode material showed better CSPof 528.7 F/g@1 A/g and excellent electrochemical stability(85%of capacitance retention after 10,000 cycles at 5 A/g)compared to other electrode materials.Furthermore,the solid-state asymmetric supercapacitor was assembled using Nidoped MoS_(2)and graphite as anode and cathode materials and analysed the electrochemical properties in the two-electrode system.To determine the impact of the Ni-atom on the MoS_(2)surface,firstprinciples computations were performed.Further,it was examined for electronic band structure,the projected density of states(PDOS)and Bader charge transfer analyses.

关 键 词：Ni-doped MoS_(2) SUPERCAPACITOR Cyclic voltammetry Specilic surface area Specific capacitance Stability 

分 类 号：TM53[电气工程—电器] TQ136.12[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程]