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1. Study on Electrochemical Activation and Electrochemical Properties of Manganese Dioxide | |||
HU Xinju,ZHAO Li,XIANG Bin | |||
Chemical Engineering 07 April 2023 | |||
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Abstract:Preparation of nanorod structures using a simple hydrothermal method α-MnO2, and then apply a certain negative voltage to 1 M LiOH, 1 M NaOH and 1 M KOH alkaline electrolytes to prepare electrochemically activated α-MnO2。 The results show that under the activation of negative voltage, alkali metal ions in the electrolyte will be embedded α- In the lattice of MnO2, thereby improving the electrical conductivity of the material. In addition, the embedded alkali metal ions can increase α- The lattice spacing of MnO2 is conducive to full contact between the active substance and the electrolyte. In electrochemical testing, the optimal activation voltage for the three electrolyte solutions of 1 M LiOH, 1 M NaOH and 1 M KOH is -1.2 V. At this activation voltage, the specific capacitance after activation in the three solutions was 155.0 F g-1, 148.4 F g-1, and 140.8 F g-1, respectively, which increased by 210%, 197%, and 182% compared to the pure sample, respectively. At the same time, the cycle performance was improved from 74.6% of the pure sample to 96.9%, 89.4%, and 91.9% of the activated sample. After activation, the magnification performance of the sample is also improved compared to the pure sample. This indicates that electrochemical activation is feasible for the modification of manganese dioxide.???? | |||
TO cite this article:HU Xinju,ZHAO Li,XIANG Bin. Study on Electrochemical Activation and Electrochemical Properties of Manganese Dioxide[OL].[ 7 April 2023] http://en.paper.edu.cn/en_releasepaper/content/4760026 |
2. Sulfur doped cobalt hydroxide electrode for high-performance supercapacitors | |||
ZHAO Li,HU Xinju,XIANG Bin | |||
Chemical Engineering 02 April 2023 | |||
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Abstract:Sulfur-doped Co(OH)2 layered nano-sheet electrode materials were prepared by a simple one-step electrodeposition method using three substances, namely thiourea (TU), thioacetamide (TAA), and N-methylthiourea (N-MTU), as sulfur sources. The morphology, crystallinity, and electronic structure of Co(OH)2 materials changed with different sulfur source doping. Three-electrode electrochemical testing in 2 M KOH showed that the electrochemical performance of the materials improved significantly after being doped with the three kinds of sulfur sources. Among them, the material doped with TU as the sulfur source exhibited the highest specific capacitance (1687.27 F g-1 at 1 A g-1), while the materials doped with TAA and N-MTU as the sulfur sources had specific capacitances of 1478.18 F g-1 and 1007.27 F g-1, respectively. Compared with pure Co(OH)2 (678.18 F g-1 at 1 A g-1), the specific capacitance was significantly improved. The S-Co(OH)2 sample doped with TU was used as the positive electrode and FeOOH@rGO was used as the negative electrode to form an STU-Co(OH)2//FeOOH@rGO ASC, which achieved a high energy density of 61.1 Wh kg-1 at a power density of 800 W kg-1 and still maintained an 83% capacity retention rate after 5000 cycles, demonstrating good practical application ability. | |||
TO cite this article:ZHAO Li,HU Xinju,XIANG Bin. Sulfur doped cobalt hydroxide electrode for high-performance supercapacitors[OL].[ 2 April 2023] http://en.paper.edu.cn/en_releasepaper/content/4760160 |
3. Doping-driven electronic structure and conductivity modification of nickel sulfide | |||
XIAO Zhenyun,ZOU Xuefeng,XIANG bin | |||
Chemical Engineering 11 April 2021 | |||
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Abstract: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. | |||
TO cite this article:XIAO Zhenyun,ZOU Xuefeng,XIANG bin. Doping-driven electronic structure and conductivity modification of nickel sulfide[OL].[11 April 2021] http://en.paper.edu.cn/en_releasepaper/content/4754605 |
4. Self-assembled graphene films with various thicknesses as supercapacitor electrodes | |||
ZHU Jianbo,CHEN Wenjing,GUAN Sinan,ZHAO Xiayi,CHEN Xueye,ZU Jiasheng | |||
Chemical Engineering 03 June 2020 | |||
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Abstract:In this paper,Graphene have attracted considerable attention as the supercapacitor material due to its high electronic conductivity and large ion-accessible surface area. Herein, self-assembled reduced grapheneoxide (rGO) films with various controllable thicknesses and mass loadings are facilely prepared via a scalable vacuum filtration method. The rGO film electrodes with considerable mass loading of 6.7 mg cm-2 exhibit high specific capacitance of 173.4 F g-1 (1.16 F cm-2) at 1 A g-1 in 6 M KOH aqueous electrolyte, indicating the high utilization of the rGO active material. Moreover, quasi-solid supercapacitors fabricated with the rGO film electrode and PVA/KOH gel electrolyte shows a high capacitance of 1.03 F cm-2 and a large energy density of 0.073 mWh cm-2 at the power density of 3.3 mW cm-2, as well as excellent cycling stability of 85.6% retention after 10000 cycles. Such remarkable performance suggests that the rGO films are promising electrode materials for supercapacitor application. | |||
TO cite this article:ZHU Jianbo,CHEN Wenjing,GUAN Sinan, et al. Self-assembled graphene films with various thicknesses as supercapacitor electrodes[OL].[ 3 June 2020] http://en.paper.edu.cn/en_releasepaper/content/4752297 |
5. Preparation and Application of CMC-PVA/CS-PVA bipolar membranes modified by PAN-FePc (COOH)8 | |||
LI Zhonggui,CHEN Riyao | |||
Chemical Engineering 07 April 2015 | |||
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Abstract:In this paper, the polyacrylonitrile (PAN)-iron octocarboxyphthalocyanine (FePc(COOH)8) nanofibers were prepared using electrospinning technique and introduced into the interlayer of a carboxymethyl cellulose (CMC)-polyvinyl alcohol (PVA)/chitosan (CS)-polyvinyl alcohol bipolar membrane (BPM), which was characterized using SEM, contact angle measurement, current-voltage characteristics, AC impedance spectroscopy and so on. The experimental results showed that after modification by PAN-FePc(COOH)8 nanofibers, the membrane impedance of the BPM and its cell voltage were decreased. That indicated that the water splitting efficiency in the interlayer of the BPM was increased. Then the prepared CMC-PVA/PAN-FePc(COOH)8/CS-PVA BPM was used in the electro-oxidized preparation of dialdehydle starch (DAS). The experimental results indicated that a current density of 20mAocm-2 was suitable to obtain high current efficiency. When the electrolysis time was 3h at a current density of 20 mAocm-2 , the current efficiency of the CMC-PVA/PAN-FePc(COOH)8/CS-PVA BPM-equipped cell was as high as 67%. | |||
TO cite this article:LI Zhonggui,CHEN Riyao. Preparation and Application of CMC-PVA/CS-PVA bipolar membranes modified by PAN-FePc (COOH)8[OL].[ 7 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4637992 |
6. Effects of Carbon on Structure and Electrochemical Performance of Li2FeSiO4 Cathode Materials for Lithium-ion Batteries | |||
ZUO Pengjian,CHENG Guangyu,WANG Tao,LI Chunxiao,YIN Geping | |||
Chemical Engineering 02 January 2012 | |||
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Abstract:Li2FeSiO4/C composite cathode material was prepared by solid-state method with sucrose as carbon source. The effects of carbon content on structure and electrochemical performance of Li2FeSiO4/C cathode materials for lithium-ion batteries were investigated. The materials were characterized comparatively by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), galvanostatic charge-discharge, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV), respectively. The SEM images showed that the Li2FeSiO4/C consists of partially agglomerated nanoparticles with an average particle size of 100 nm. TEM images confirmed that a carbon layer was formed on the surface of Li2FeSiO4/C particles, which aimed to enhance the electronic conductivity of the material as well as inhibit the agglomeration during annealing process. The electrochemical measurement results revealed that the Li2FeSiO4/C composite with 7.5wt % carbon shows a good electrochemical performance with an initial discharge capacity of 141 mAhog-1 at 0.1C, and remains a discharge capacity of 103.6 mAhog-1 at 0.5C after 50 cycles. | |||
TO cite this article:ZUO Pengjian,CHENG Guangyu,WANG Tao, et al. Effects of Carbon on Structure and Electrochemical Performance of Li2FeSiO4 Cathode Materials for Lithium-ion Batteries[J]. |
7. Effect of anode composition on the electrochemical properties of the direct hydrazine fuel cell | |||
Ye Liqiang,Li Zhoupeng | |||
Chemical Engineering 09 June 2010 | |||
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Abstract:A composite catalyst has been prepared by mixing Ni powder, surface-treated Zr-Ni alloy and Pd/C and used as the anode catalyst in the direct hydrazine fuel cell (DHFC). The catalytic activity of these catalysts is evaluated by linear potential sweep, electrochemical impedance spectra (EIS) analysis, polarization measurement. A maximum power density of 106 mW cm-2 has been achieved by using the composite catalyst as the anode catalyst and Pt/C as the cathode catalyst at 0.407 V under ambient conditions. It is found that the composite catalyst shows lower polarization than other catalysts. Results from linear potential sweep and EIS confirm that the cell performance is determined by the anode electrocatalysis towards the oxidation of hydrazine. | |||
TO cite this article:Ye Liqiang,Li Zhoupeng. Effect of anode composition on the electrochemical properties of the direct hydrazine fuel cell[OL].[ 9 June 2010] http://en.paper.edu.cn/en_releasepaper/content/4375570 |
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