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Doping-driven electronic structure and conductivity modification of nickel sulfide
XIAO Zhenyun 1,ZOU Xuefeng 2,XIANG bin 3 *
1.School of Chemistry and Chemical Engineering, Chongqing Univertsity,Chongqiong 401331;Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018;Chemical Process Intensification and Reaction, Chongqing University, Chongqing 400044
2.School of Chemistry and Chemical Engineering, Chongqing Univertsity,Chongqiong 401331 ;
3. Guizhou Provincial Key Laborat ory of Computational Nano - Material Science, Guizhou Education University, Guiyang 550018
*Correspondence author
#Submitted by
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Funding: none
Opened online:19 April 2021
Accepted by: none
Citation: XIAO Zhenyun,ZOU Xuefeng,XIANG bin.Doping-driven electronic structure and conductivity modification of nickel sulfide[OL]. [19 April 2021] http://en.paper.edu.cn/en_releasepaper/content/4754605
 
 
The lack of electrical conductivity limits the electrochemical kinetic rate of the electrode material, resulting in the inability to reach its theoretical capacity. A facile method was adopted to improve intrinsic conductivity of hybrid nickel sulfide, with the usage of doping of transitional metal atoms Co, Mn and Ag. Through the introduction of heteroatoms, the electronic structure of the electrode material is modified and the electrical conductivity is significantly improved, thus enhancing its electrochemical performance. The improvement of conductivity are attributed to the forming of intermediate bands of transition metal and redistribution of electrons, and the result was demonstrated by experimental and density functional theory (DFT) calculations. As a result, the Co doped nickel sulfide with a 0.5% doping amount reach the highest specific capacitance of 2874 F/g at 1 A/g, increasing specific capacitance of 653 F/g as 29.4% of the specific capacity of non-doped nickel sulfide. The Co doped nickel sulfide also exhibits remarkable cycling stability compared with non-doped nickel sulfide. The assembled 2% Co-doped nickel sulfide//rGO, 0.5% Mn-doped nickel sulfide//rGO and 0.5% Ag-doped nickel sulfide//rGO asymmetric supercapacitors show a specific energy density of 36.6, 36.1 and 36.0 Wh/Kg at a power density of 800 Wh/Kg. This study will be a useful insight for fabrication of high performance pseudocapacitive materials.
Keywords:Chemical Engineering; Doping; Nickel Sulfide; Supercapacitors
 
 
 

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