Nanosheets with mesopores on the surface have been prepared using molybdenum trioxide(α-MoO3).The effect of mesopores on the performance of the electrode remains elusive.The MoO3 nanosheets obtained in this study exh...Nanosheets with mesopores on the surface have been prepared using molybdenum trioxide(α-MoO3).The effect of mesopores on the performance of the electrode remains elusive.The MoO3 nanosheets obtained in this study exhibited great battery performance, including good capacity, prolonged recycling life cycles, and excellent rate performance;e.g., 780 mAh/g when charged under a super high current-density of 1000 m A/g.These nanosheets demonstrated excellent stability, maintaining a capacity of 1189 mAh/g after 20 cycles, and 1075 mAh/g after 50 cycles;thus preventing the capacity to decrease to values under the scanning rate of 100 mA/g.These high-purity MoO3 nanosheets are well-ordered and have dense mesopores on the surface;these micropores contribute to the excellent electrode performance of the host electrode materials;the performance parameters include prolonged battery life and capacity.Setting mesopores or active sites on the electrode surface can be an alternative way to obtain stable electrodes in the future.展开更多
The influence of microstructure homogeneity on the electrochemical performance for MmNi 3 5 Co 0 8 Mn 0 4 Al 0 3 alloy system was studied. It was found that technological parameters, such as tempe...The influence of microstructure homogeneity on the electrochemical performance for MmNi 3 5 Co 0 8 Mn 0 4 Al 0 3 alloy system was studied. It was found that technological parameters, such as temperature and refining time during alloy melting process have effects on the microstructure homogeneity and latter obviously influences the electrode performance, such as discharge potential plateau and cycle life of the alloys.展开更多
The effect of La alloying on the crystalline characteristics, electrochemical capacity and activity of AB2 type Zr-Cr-Ni hydride electrodes was investigated. It was found that La alloying was able to shorten the activ...The effect of La alloying on the crystalline characteristics, electrochemical capacity and activity of AB2 type Zr-Cr-Ni hydride electrodes was investigated. It was found that La alloying was able to shorten the activating process from 15 cycles of La-free alloy to 2 cycles, and that the main phase shifts from C14 to C15 by XRD analysis. It may be attributed to the modification of surface chemical states and change in internal microstructures. However, the cycling stability was also found to degrade severely for La-containing hydride electrode because of the collapse of its distorted lattice.展开更多
A novel plastic/multi-walled carbon nanotube（MWNTs）-nickel（Ni）-platinum（Pt） electrode（PMNP） is prepared by chemical-reducing Pt onto the surface of Ni film covered plastic/MWNTs（PM） substrate. The MWNTs are ...A novel plastic/multi-walled carbon nanotube（MWNTs）-nickel（Ni）-platinum（Pt） electrode（PMNP） is prepared by chemical-reducing Pt onto the surface of Ni film covered plastic/MWNTs（PM） substrate. The MWNTs are adhered by a piece of commercial double faced adhesive tape on the surface of plastic paper and the Ni film is prepared by a simple electrodeposition method. The morphology and phase structure of the PMNP electrode are characterized by scanning electron microscopy,transmission electron microscope and X-ray diffractometer. The catalytic activity of the PMNP electrode for Na BH4 electrooxidation is investigated by means of cyclic voltammetry and chronoamperometry. The catalyst combines tightly with the plastic paper and exhibits a good stability. MWNTs serve as both conductive material and hydrogen storage material and the Ni film and Pt are employed as electrochemical catalysts. The PMNP electrode exhibits a high electrocatalytic performance and the oxidation current density reaches to 10.76 A/（mg·cm） in 0.1 mol/dm3 Na BH4at0 V,which is much higher than those in the previous reports. The using of waste plastic reduces the discarding of white pollution and consumption of metal resources.展开更多
A new procedure for developing high performance enzyme electrode is described. The procedure is based on the covalently binding of horseradish peroxidase to a self-assembling monolayer on a gold electrode. An enhanced...A new procedure for developing high performance enzyme electrode is described. The procedure is based on the covalently binding of horseradish peroxidase to a self-assembling monolayer on a gold electrode. An enhanced catalytic current is observed with addition of hydrogen peroxide into phosphate buffer solution (PBS) in the presence of mediators. The electrode exhibits high sensitivity and a wide linear range to hydrogen peroxide.展开更多
Zinc-polyiodide redox flow battery(RFB)systems with highly soluble triiodide/iodide(I_(3)^(-)/I^(-))couples have demonstrated significantly enhanced energy densities.However,their low power density has limited their b...Zinc-polyiodide redox flow battery(RFB)systems with highly soluble triiodide/iodide(I_(3)^(-)/I^(-))couples have demonstrated significantly enhanced energy densities.However,their low power density has limited their broad application.In this work,MoS_(2)nanoplates were in situ grafted onto graphite felt(GF)surfaces to accelerate the I_(3)^(-)/I^(-)redox reaction.The hexagonal phase MoS_(2)with enlarged interlayer spacing can facilitate the diffusion of the electrolyte,and the defects on the MoS_(2)nanoplates can serve as very effective catalytic active sites.Cyclic voltammetry testing revealed the high catalytic performance of MoS_(2)in the I_(3)^(-)/I^(-)redox reaction.A non-flow cell with the MoS_(2)-modified GF serving as a positive electrode showed a higher energy efficiency than that of pristine GF;increases of about 10.2%and 10.9%at current densities of 30 mA cm^(-2)and 40 mA cm^(-2)were obtained with the optimized electrode,respectively.展开更多
As the key component of electrochemical energy storage devices, an electrode with superior ions transport pores is the important premise for high electrochemical performance. In this paper, we developed a unique solut...As the key component of electrochemical energy storage devices, an electrode with superior ions transport pores is the important premise for high electrochemical performance. In this paper, we developed a unique solution process to prepare freestanding TiO_2/graphene hydrogel electrode with tunable density and porous structures. By incorporating room temperature ionic liquids（RTILs）, even upon drying, the non-volatile RTILs that remained in the gel film would preserve the efficient ion transport channels and prevent the electrode from closely stacking, to develop dense yet porous structures. As a result, the dense TiO_2/graphene gel film as an electrode for lithium ion battery displayed a good gravimetric electrochemical performance and more importantly a high volumetric performance.展开更多
A novel 1D/2D hybrid design is reported for synthesizing a high performance NiCo-hydroxide nanowires/reduced graphene oxide(NiCo-NWs/G)composite.The oxygen-containing groups on the graphene oxide surface can act as an...A novel 1D/2D hybrid design is reported for synthesizing a high performance NiCo-hydroxide nanowires/reduced graphene oxide(NiCo-NWs/G)composite.The oxygen-containing groups on the graphene oxide surface can act as anchoring sites for uniformly adsorbing the metal seeds,leading to the dispersed formation of thin NiCo-NWs on the graphene surface.The existence of graphene in NiCo-NWs/G can provide a conductive network to boost the faradaic reactions.In addition,the bimetallic NiCo-NWs possess rich redox reaction sites and the thin nanowire structure ensures that electrons can move rapidly from the reaction sites to the current collectors.Owing to the synergic effects of 1D NiCo-NWs and 2D graphene,the developed NiCo-NWs/G electrode exhibits an excellent performance of 1449 F g^(-1) at a current density of 1 A g^(-1),a high rate capability of 61%at 20 A g^(-1),and a good cycling stability in 6 M KOH electrolyte.Moreover,the asymmetric supercapacitor with NiCo-NWs/G as a positive electrode and active carbon as a negative electrode delivers a high energy density of 42.1 W h kg^(-1) at a power density of 0.8 kW kg^(-1).This work may pave a promising new way for the development of 1D/2D composites based on pseudocapacitive hydroxides and carbon materials for high-performance asymmetric supercapacitors.展开更多
基金financially supported by the National Natural Science Foundation of China (No.51771125)。
文摘Nanosheets with mesopores on the surface have been prepared using molybdenum trioxide(α-MoO3).The effect of mesopores on the performance of the electrode remains elusive.The MoO3 nanosheets obtained in this study exhibited great battery performance, including good capacity, prolonged recycling life cycles, and excellent rate performance;e.g., 780 mAh/g when charged under a super high current-density of 1000 m A/g.These nanosheets demonstrated excellent stability, maintaining a capacity of 1189 mAh/g after 20 cycles, and 1075 mAh/g after 50 cycles;thus preventing the capacity to decrease to values under the scanning rate of 100 mA/g.These high-purity MoO3 nanosheets are well-ordered and have dense mesopores on the surface;these micropores contribute to the excellent electrode performance of the host electrode materials;the performance parameters include prolonged battery life and capacity.Setting mesopores or active sites on the electrode surface can be an alternative way to obtain stable electrodes in the future.
文摘The influence of microstructure homogeneity on the electrochemical performance for MmNi 3 5 Co 0 8 Mn 0 4 Al 0 3 alloy system was studied. It was found that technological parameters, such as temperature and refining time during alloy melting process have effects on the microstructure homogeneity and latter obviously influences the electrode performance, such as discharge potential plateau and cycle life of the alloys.
文摘The effect of La alloying on the crystalline characteristics, electrochemical capacity and activity of AB2 type Zr-Cr-Ni hydride electrodes was investigated. It was found that La alloying was able to shorten the activating process from 15 cycles of La-free alloy to 2 cycles, and that the main phase shifts from C14 to C15 by XRD analysis. It may be attributed to the modification of surface chemical states and change in internal microstructures. However, the cycling stability was also found to degrade severely for La-containing hydride electrode because of the collapse of its distorted lattice.
基金supported by the Fundamental Research Funds for the Central Universities (HEUCF201403018)the Heilongjiang Postdoctoral Fund (LBHZ13059)+1 种基金the China Postdoctoral Science Foundation (2014M561332)the National Natural Science Foundation of China (21403044)
文摘A novel plastic/multi-walled carbon nanotube（MWNTs）-nickel（Ni）-platinum（Pt） electrode（PMNP） is prepared by chemical-reducing Pt onto the surface of Ni film covered plastic/MWNTs（PM） substrate. The MWNTs are adhered by a piece of commercial double faced adhesive tape on the surface of plastic paper and the Ni film is prepared by a simple electrodeposition method. The morphology and phase structure of the PMNP electrode are characterized by scanning electron microscopy,transmission electron microscope and X-ray diffractometer. The catalytic activity of the PMNP electrode for Na BH4 electrooxidation is investigated by means of cyclic voltammetry and chronoamperometry. The catalyst combines tightly with the plastic paper and exhibits a good stability. MWNTs serve as both conductive material and hydrogen storage material and the Ni film and Pt are employed as electrochemical catalysts. The PMNP electrode exhibits a high electrocatalytic performance and the oxidation current density reaches to 10.76 A/（mg·cm） in 0.1 mol/dm3 Na BH4at0 V,which is much higher than those in the previous reports. The using of waste plastic reduces the discarding of white pollution and consumption of metal resources.
文摘A new procedure for developing high performance enzyme electrode is described. The procedure is based on the covalently binding of horseradish peroxidase to a self-assembling monolayer on a gold electrode. An enhanced catalytic current is observed with addition of hydrogen peroxide into phosphate buffer solution (PBS) in the presence of mediators. The electrode exhibits high sensitivity and a wide linear range to hydrogen peroxide.
基金National Key R&D Program of China(2016YFB0901500,2016YFB0101201)National Natural Science Foundation of China(21805141,11704114,61427901 and 51771094)+1 种基金Ministry of Education of China(B12015)Tianjin High-Tech(No.18JCZDJC31500)。
文摘Zinc-polyiodide redox flow battery(RFB)systems with highly soluble triiodide/iodide(I_(3)^(-)/I^(-))couples have demonstrated significantly enhanced energy densities.However,their low power density has limited their broad application.In this work,MoS_(2)nanoplates were in situ grafted onto graphite felt(GF)surfaces to accelerate the I_(3)^(-)/I^(-)redox reaction.The hexagonal phase MoS_(2)with enlarged interlayer spacing can facilitate the diffusion of the electrolyte,and the defects on the MoS_(2)nanoplates can serve as very effective catalytic active sites.Cyclic voltammetry testing revealed the high catalytic performance of MoS_(2)in the I_(3)^(-)/I^(-)redox reaction.A non-flow cell with the MoS_(2)-modified GF serving as a positive electrode showed a higher energy efficiency than that of pristine GF;increases of about 10.2%and 10.9%at current densities of 30 mA cm^(-2)and 40 mA cm^(-2)were obtained with the optimized electrode,respectively.
基金supported by grants from the National Natural Science Foundation of China(21303251)Innovation Program of Shanghai Municipal Education Commission(16SG17)the Shenzhen Science and Technology Foundation(JCYJ201419122040621)
文摘As the key component of electrochemical energy storage devices, an electrode with superior ions transport pores is the important premise for high electrochemical performance. In this paper, we developed a unique solution process to prepare freestanding TiO_2/graphene hydrogel electrode with tunable density and porous structures. By incorporating room temperature ionic liquids（RTILs）, even upon drying, the non-volatile RTILs that remained in the gel film would preserve the efficient ion transport channels and prevent the electrode from closely stacking, to develop dense yet porous structures. As a result, the dense TiO_2/graphene gel film as an electrode for lithium ion battery displayed a good gravimetric electrochemical performance and more importantly a high volumetric performance.
基金supported by the National Science Foundation of China(51802251)the National Key Research&Development Program(2018YFB0604604)+3 种基金the China Postdoctoral Science Foundation(2018M631168 and 2019M651118)the Natural Science Foundation of Liaoning Province(2019-ZD-0020)the Doctoral Start-up Foundation of Liaoning Province(20170520263)the Fundamental Research Funds for the Central Universities(DUT18RC(4)059 and DUT19JC54).
文摘A novel 1D/2D hybrid design is reported for synthesizing a high performance NiCo-hydroxide nanowires/reduced graphene oxide(NiCo-NWs/G)composite.The oxygen-containing groups on the graphene oxide surface can act as anchoring sites for uniformly adsorbing the metal seeds,leading to the dispersed formation of thin NiCo-NWs on the graphene surface.The existence of graphene in NiCo-NWs/G can provide a conductive network to boost the faradaic reactions.In addition,the bimetallic NiCo-NWs possess rich redox reaction sites and the thin nanowire structure ensures that electrons can move rapidly from the reaction sites to the current collectors.Owing to the synergic effects of 1D NiCo-NWs and 2D graphene,the developed NiCo-NWs/G electrode exhibits an excellent performance of 1449 F g^(-1) at a current density of 1 A g^(-1),a high rate capability of 61%at 20 A g^(-1),and a good cycling stability in 6 M KOH electrolyte.Moreover,the asymmetric supercapacitor with NiCo-NWs/G as a positive electrode and active carbon as a negative electrode delivers a high energy density of 42.1 W h kg^(-1) at a power density of 0.8 kW kg^(-1).This work may pave a promising new way for the development of 1D/2D composites based on pseudocapacitive hydroxides and carbon materials for high-performance asymmetric supercapacitors.
