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1. Halogen-controlled synthesis of nickel hydroxide halide for electrode active materials | |||
LI Weining,ZOU Xuefeng,XIANG Bin | |||
Chemistry 16 April 2021 | |||
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Abstract:The performance of the material is closely related to its morphology and composition. In this research, we used halogen anions to control the solvothermal process to synthesize a series of halogen hydroxy nickel and studied their electrochemical performance. We find that halogen anions have a huge impact on morphology, composition and performance of the product. Specially, Ni(OH)Cl is a micro-flower with a large specific surface area composed of ultra-thin nano-sheets. In the three-electrode system, the Ni(OH)Cl electrode exhibits higher specific capacity (142 mAh g-1 at the current densities of 1 A g-1) than other electrodes due to its special morphology and structure. When assembled an asymmetric supercapacitor (Ni(OH)Cl//rGO ASC) by employing nickel hydroxychloride, rGO and 2M KOH aqueous solution as the positive electrode, the negative electrode, and the electrolyte, respectively. The device demonstrated a high energy density of 66 Wh kg?1 at a power density of 800W kg?1 and maintained at an energy density of 35.4 Wh kg?1 even with a high power density of 8000 W kg?1. This research will provide a new idea for controlling the morphology and composition of materials. | |||
TO cite this article:LI Weining,ZOU Xuefeng,XIANG Bin. Halogen-controlled synthesis of nickel hydroxide halide for electrode active materials[OL].[16 April 2021] http://en.paper.edu.cn/en_releasepaper/content/4754602 |
2. Interface-driven synthesis of CuO@CN LDH on copper foam for high-performance supercapacitors | |||
SONG Tingting,ZOU Xuefeng,XIANG Bin | |||
Chemistry 11 April 2021 | |||
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Abstract:Under the condition of not using a binder, the active material can be directly grown on the conductive base material as the electrode of the capacitor. The internal space structure of this electrode material makes the ion transport area easy to diffuse and brings more active sites, which leads to its excellent electrical conductivity and the formation of a prominent conductive network. However, the adhesion between the active material and the substrate is weak and even easy to fall off, resulting in poor cycling performance of the capacitor To solve this problem, we provide a novel strategy. The Co-Ni double hydroxide core-shell structure was gradually formed by the pre-oxidation of copper foam, an interface-modulated copper foam framework surface, re-oxidation and electrodeposition. Furthermore,it was founded that the adhesive force of CuO grown free-standing on copper foam is enhanced in this way. The specific capacity of the prepared core-shell nanohybrid (POCF@CuO@CN LDH) by the two-step oxidation method was 4027.28 F g-1 at 1 A g-1, and that of the core-shell nanohybrid (OCF@CuO@CN LDH) prepared by the direct oxidation method was 2377.50 F g-1 at 1 A g-1. The former is 1.7 times than the latter. The POCF@CuO@CN LDH electrode has a capacitance retention rate of 80.84 % after 10000 cycles at 20 A g-1 with excellent multiplicity performance and long cycle stability. The as-assembled POCF@CuO@CN LDH//RGO asymmetric supercapacitor (ASC) provides a excellent energy density of 41.73 Wh kg-1 at a power density of 800.13 W kg-1 and a capacitance retention rate of 73.17 % after 10000 cycles at 5 A g-1. In addition, a commercial 1W light-emitting diode indicator with blue light can be energized for 4 minutes when two ultra-capacitor devices connected in series are linked in series. As such, it can be suggested that the two-step oxidation method, which provides a strategy for the integration of nanocomposite materials and substrates with strong interfacial adhesion, may have great potential in high-performance electrochemical devices. | |||
TO cite this article:SONG Tingting,ZOU Xuefeng,XIANG Bin. Interface-driven synthesis of CuO@CN LDH on copper foam for high-performance supercapacitors[OL].[11 April 2021] http://en.paper.edu.cn/en_releasepaper/content/4754601 |
3. Modulating Prussian Blue Analogues-derived Binary Metal Oxides for Efficient Oxygen Evolution Catalysts | |||
XIAO Shenghuan,YANG Yang,ZHANG Yunhuai | |||
Chemistry 18 May 2020 | |||
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Abstract:Oxygen evolution reaction (OER) is closely related to numerous energy-related applications so that developing high-activity, durable and cost-effective electrocatalysts for OER has been an inevitable trend. Prussian blue analogues (PBAs), a kind of metal organic frameworks (MOFs), which have been paid more attention in the filed of electrocatalysis because of unique framework structure and adjustable components. Herein, we synthesis a series of Ni-Co PBAs via modulating metal ratio by a coprecipitation method and then anneal the as-prepared Ni-Co PBAs, which used as OER catalysts. We found that as the increasing of nickel content, the size of catalysts decreases, which resulting in an increasing of specific surface area and electrochemical active sites, thereby improving the performance of OER. Furthermore, benefiting from the minimum size with largest specific area, largest electrochemical active surface area with different and abundant active sites, the Ni-Co-31 oxides shows a small overpotential of 340 mV at a current density of 10 mAocm-2, a small Tafel slope of 89 mVodec-1, which is superior to other catalysts prepared. This work proves the great significance of PBAs derivatives with different metal ratios for OER performance, which is meaningful for the preparation and mass production of efficient electrocatalysts. | |||
TO cite this article:XIAO Shenghuan,YANG Yang,ZHANG Yunhuai. Modulating Prussian Blue Analogues-derived Binary Metal Oxides for Efficient Oxygen Evolution Catalysts[OL].[18 May 2020] http://en.paper.edu.cn/en_releasepaper/content/4752128 |
4. Electrochemical Decontamination of Platinum Nanocrystals and its Electrocatalytic Performances for Methanol | |||
LU Leilei,DU Baozhong,YANG Rong,LIU Yuyao,LI Yukang | |||
Chemistry 20 April 2017 | |||
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Abstract:This work focused on the decontamination of polyvinylpyrrolidone(PVP) on platinum by electrochemical treatment. Pt nanocrystals were synthesized by colloidal method using chloroplatinic acid as the metal precursor and PVP K30 as a stabilizer. Spherical, cubic, octahedral and cuboctahedral Pt nanocrystals were obtained by adding different concentrations of silver nitrate to the above colloidal solution. The morphology of Pt nanocrystals was characterized by transmission electron microscope (TEM). It was found that the as-prepared Pt nanocrystals were well dispersed with a narrow size distribution. Electrochemical decontamination was applied to the Pt nanocrystals by short pulse potential step before electrocatalytic performance measurements. Repeating potential steps were set up between high voltage and low voltage. As the potential step proceeding, Pt surface sites were exposed gradually, which could be confirmed from the more and more clear hydrogen and oxygen adsorption/desorption peaks of the cyclic voltammograms (CV). The electrocatalytic activity of the electrochemically cleaned Pt nanocrystals was characterized by CV and chronoamperometry measurements. It was found that cuboctahedral Pt nanocrystals showed the best catalytic activity for methanol electrooxidation. This study put forward a simply and effective electrochemical decontamination method of the Pt surfaces capped by PVP. | |||
TO cite this article:LU Leilei,DU Baozhong,YANG Rong, et al. Electrochemical Decontamination of Platinum Nanocrystals and its Electrocatalytic Performances for Methanol[OL].[20 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4727458 |
5. Study on Synthesis and Electrochemical Performance of PMo-PDDA-GO Composite | |||
Ding Chao ,Gu Dawei,Lu Yi ,Xu Tianye ,Sun Hongshun,Li Jishu, Wang Lei,Shen Linjiang | |||
Chemistry 28 March 2017 | |||
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Abstract:A series of composites containing polyoxometalate (PMo), poly (diallyldimethylammonium chloride) (PDDA), and graphene oxide (GO) with different oxidation degrees were prepared in a two-step self-assembly process. The resulting polyoxometalate-poly (diallyldimethylammonium chloride)-graphene oxide (PPGx, x = 1 to 5) composites and their precursors (PDDA-GOx, x = 1 to 5) were analyzed with AFM, XRD, and FTIR spectroscopy. The self-assembly process was schematically summarized. The interspace distance between GO sheets in PPGx increased when the oxidation degree of GO increased. This increase in interspace distance was accompanied by a rapid decrease in the electrical conductivity of PPGx. At a sufficient high oxidation degree (x > 3), PDDA was completely inserted into the interspace of the laminated structure of the GO sheets in PPGx. The experimental results indicated that PDDA acted as a bridge, increasing electrostatic interaction between PMo anions and the GO sheets and causing many PMo anions to become anchored on the GO sheets. The electrochemical performances of the PPGx composites were greatly enhanced by the immobilization of PMo anions on GO sheets via PDDA, resulting in a much larger specific capacitance and a remarkably enhanced cycling stabilityIn this paper. | |||
TO cite this article:Ding Chao ,Gu Dawei,Lu Yi , et al. Study on Synthesis and Electrochemical Performance of PMo-PDDA-GO Composite[OL].[28 March 2017] http://en.paper.edu.cn/en_releasepaper/content/4723025 |
6. Promising porous carbons derived from lotus seedpods with outstanding supercapacitance performance | |||
LIU Bei,ZHOU Xiahong,CHEN Hongbiao,LIU Yijiang,LI Huaming | |||
Chemistry 08 April 2016 | |||
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Abstract:Biomass-derived porous carbons are widely regarded as one of the most promising electrode materials for supercapacitors owing to their natural abundance and low-cost. Herein, we present a facile approach to synthesize promising porous carbons via a two-step fabrication process using lotus seedpods (LS) as the biomass precursor. Firstly, the LS is hydrothermally treated in a KOH aqueous solution. After filtration and drying, the hydrothermal product is directly subjected to simultaneous pyrolysis and activation, giving LS-derived porous carbon materials. The morphology, structure and textural properties of the carbon materials are investigated by scanning electron microscopy, transmission electron microscopy, and N2 sorption isotherms. The porous carbon prepared under optimal conditions exhibits a relatively high BET surface area of 1813 m2 g-1 and an average pore size of 3.30 nm. Such porous carbon shows outstanding capacitive performance (402 F g-1 at 0.5 A g-1), good rate capability and excellent cycling stability (95.4% of capacitance retention after 10,000 cycles) in 6 M KOH electrolyte. More importantly, the as-assembled symmetric supercapacitor delivers a high energy density of 12.5 Wh kg-1 at power density of 260 W kg-1. | |||
TO cite this article:LIU Bei,ZHOU Xiahong,CHEN Hongbiao, et al. Promising porous carbons derived from lotus seedpods with outstanding supercapacitance performance[OL].[ 8 April 2016] http://en.paper.edu.cn/en_releasepaper/content/4683049 |
7. An photoelectrochemical sensing platform structured with absorbing hematin on carbon nanohorns superstructures for roxarsone determination | |||
YAN Huixiang,ZHANG Shupei,XU Guifang,GONG Lingshan,ZHANG Qingrong,LI Yilin,DAI Hong | |||
Chemistry 30 March 2015 | |||
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Abstract:In this paper, a new proposal for designing sensitive photoeletrochemical sensor with a ternary hybrid film developed by absorbing hematin on carbon nanohorns superstructures and poly-L-lysine complex support to achieve quantificational detection of 4-Hydrox-3-nitrobenzenenearsonic acid (HNBAA) was offered. Here, hematin with easy acquirement, good biocompatibility and strong visible light harvesting capability, was introduced as photosensitizer for photoelectrochemical determination. Additionally, the complex support composed by fascicled superstructures of carbon nanohorns which possessed many superiors, such as excellent electronic conductivity, large specific area and adsorption etc, and poly-L-lysine which could form hydrogen bond with hematin performed excellent immobilization action of hematin. Due to the synergistic effect and surface enhancement effect, complex support provided a charge-transfer matrix to catch and transport excited electron from hematin rapidly, which was benefit to baffle photogenerated electron-hole recombination and improve photoelectrochemical signal in visible light region effectively. HNBAA, as a photogenerated hole scavenger, enhanced the photoelectrochemical response again. Furthermore, the excellent sensitivity and broad linear detection range to HNBAA of this sensor with good stability and high selectivity, satisfied reproducibility and acceptable accuracy was propitious to practical application of sample analysis, and the good biocompatibility of modified materials and low applied potential on this sensor laid a foundation for its promising application. | |||
TO cite this article:YAN Huixiang,ZHANG Shupei,XU Guifang, et al. An photoelectrochemical sensing platform structured with absorbing hematin on carbon nanohorns superstructures for roxarsone determination[OL].[30 March 2015] http://en.paper.edu.cn/en_releasepaper/content/4635258 |
8. Cyclic Voltammetry and Thermodynamic Properties of Ln3+ in 1-Butyl-3-methylimidazolium Bromide Ionic Liquid | |||
YANG Xiao,HE Ling,TAO Guohong | |||
Chemistry 20 January 2014 | |||
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Abstract:In this paper, the cyclic voltammograms and thermodynamic properties of Eu(III), Sm(III), Dy(III) and Nd(III) in 1-butyl-3-methylimidazolium bromide ionic liquid were studied at GC working electrode in the temperature range of 298-373 K. The cyclic voltammograms of these lanthanide ions were composed of quasi-reversible waves and the current intensity increases with the temperature increased. At 373 K, the cathodic peak and anode peak potentials of Eu(III), Sm(III), Dy(III) and Nd(III) were -0.664 V, -0.511 V, -0.521 V, -0.508 V and -0.410 V, 0.293 V, 0.280 V, 0.269 V, respectively, while were due to the reduction of Ln(III) (Ln= Eu, Sm, Dy, Nd) to Ln(II) and the oxidation of Ln(II) to Ln(III). The diffusion coefficients, transfer coefficients and charge transfer rate constants of these trivalents were estimated. Moreover, the apparent standard potentials and some thermodynamic properties of the reduction of Ln(III) to Ln(II) were also investigated. | |||
TO cite this article:YANG Xiao,HE Ling,TAO Guohong. Cyclic Voltammetry and Thermodynamic Properties of Ln3+ in 1-Butyl-3-methylimidazolium Bromide Ionic Liquid[OL].[20 January 2014] http://en.paper.edu.cn/en_releasepaper/content/4582496 |
9. Electrocarboxylation of haloacetophenones at Ag electrode | |||
WANG Huan,Xu Xiaoming,LAN Yangchun,WANG Huimei,LU Jiaxing | |||
Chemistry 08 October 2013 | |||
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Abstract:Electrocarboxylation of haloacetophenones 1 has been carried out in an undivided cell equipted with Ag cathode and Mg sacrificial anode in N,N-dimethylformamide (DMF). Cyclic voltammetry was also used to investigate the electroreduction behavior of haloacetophenones at Ag electrode. The cleavage of C-X bond was more favored for the electrocatalytic ability of Ag. Thus, 4-acetyl benzoate 2 was obtained as the principal product, accompanied by acetophenone 3 and 2-hydroxy-2-phenylpropionate 4. The performances of process have been found to be dependent on the synthesis conditions, such as cathode material, supporting electrolyte, electric charge, current density and the temperature. Higher yields were obtained by changing from chloro to bromo to iodo derivatives, and from ortho to para to meta isomer. | |||
TO cite this article:WANG Huan,Xu Xiaoming,LAN Yangchun, et al. Electrocarboxylation of haloacetophenones at Ag electrode[OL].[ 8 October 2013] http://en.paper.edu.cn/en_releasepaper/content/4563209 |
10. Synthesis and characterization of Lead sulfate/ graphene nano sheets composites as anode materials for lead acid battery | |||
MA Jingliang,WANG Dianlong | |||
Chemistry 16 January 2013 | |||
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Abstract:In this paper, we have used a simple impregnation way to synthesize lead sulfate/graphene nano sheets (GNS) composites in order to make lead sulfate available for being used as negative active materials of lead acid battery. Compared with pure lead sulfate electrodes, the composite electrodes display higher specific capacity and rechargeable performance under high rates charge and discharge. The electrochemical characteristic of the composites electrode has been investigated by cyclic voltammetry (CV) and battery tests. The cyclic voltammetry results show that capacitive effect of graphene nano sheets becomes more obvious with the increases of scanning rates, meanwhile hydrogen evolution also enhances. The battery charge-discharge curves confirm that graphene nano sheets can help improve the capacity of lead sulfate, and graphene nano sheets improve the charging voltage. The composites are characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) whose results show that lead sulfate particles are well dispersed on surface of graphene nano sheets instead of agglomerate whether for raw materials or negative active materials after charge and discharge. The morphologies characterization and electrochemical tests demonstrate that synthetic composites can be used as negative active materials and graphene nano sheets can promote dispersion and electrochemical performance of lead sulfate. | |||
TO cite this article:MA Jingliang,WANG Dianlong. Synthesis and characterization of Lead sulfate/ graphene nano sheets composites as anode materials for lead acid battery[OL].[16 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4515367 |
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