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Chang B.,Zhejiang Sci-Tech University | Chang B.,Huanghe Science and Technology College | Wang Y.,Zhejiang Sci-Tech University | Pei K.,Zhejiang Sci-Tech University | And 2 more authors.
RSC Advances | Year: 2014

Thanks to the unique architectural design, nanosized porous carbon materials exhibit better behavior as electrical double-layer capacitors than conventional carbon-base materials. In this work, porous carbon sphere (PCS) materials with superior porosity and uniform nanospherical morphology were successfully prepared by means of a facile chemical activation route. The analysis of pore structure and morphology of the resultant PCS were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2sorption technology and electron microscope. The results indicated that this PCS material possess remarkable porosity, extremely large surface area (∼2500 m2g-1), large pore volume (1.37 cm3g-1) and narrow pore distribution (2.73 nm). The well-developed mesoporous structure and high surface area benefited the PCS to exhibit an excellent charge storage capacity with a specific capacitance of 196 F g-1in 2 M KOH at a current density of 0.5 A g-1and long-term cycling stability over 1000 cycles. Compared with ordered mesoporous carbon and other porous carbon materials, PCS present an enhanced electrochemical performance, which could be attributed to its high surface area and well-developed mesoporosity, as well as its nanospherical morphology, favoring the ion accumulation on the electrode surface and facilitating fast electrolyte ion transportation. This journal is © the Partner Organisations 2014.


Wang Y.,Zhejiang Sci-Tech University | Chang B.,Zhejiang Sci-Tech University | Guan D.,Zhejiang Sci-Tech University | Pei K.,Zhejiang Sci-Tech University | And 3 more authors.
Materials Letters | Year: 2014

A nanospherical porous NiO electrode material was successfully prepared by a nanocasting method using porous carbon nanospheres as a hard template. The obtained porous NiO materials were characterized with high crystalline degree, larger surface area than 200 m2g-1, 5-6 nm mesoporous channels and nanospherical morphology with 500-700 nm in diameter, which render them excellent electrochemical performance. The galvanostatic charge-discharge measurements demonstrated that the optimal electrode possessed a high specific capacitance of 1201 F g-1 at a discharge current density of 0.5 A g-1. In addition, specific capacitances at different discharge current densities indicated a good capacitance at high current density and electrochemical impedance spectra suggested low charge transfer resistance of the electrodes. It also exhibited cycling stability of 70% capacity retention after 500 continuous charge/discharge cycles. © 2014 Elsevier B.V.


Liu Y.,Zhejiang Academy of Agricultural Sciences | Wang Y.,Zhejiang Academy of Agricultural Sciences | Lu H.,Zhejiang Academy of Agricultural Sciences | Chen Y.,Zhejiang Academy of Agricultural Sciences | And 4 more authors.
Ying yong sheng tai xue bao = The journal of applied ecology / Zhongguo sheng tai xue xue hui, Zhongguo ke xue yuan Shenyang ying yong sheng tai yan jiu suo zhu ban | Year: 2013

A field experiment was conducted to investigate the effects of rice straw returning and rice straw biochar and life rubbish biochar application on the greenhouse gas (CH4, CO2 and N2O) emission from paddy soil, its physical and chemical properties, and rice grain yield. Compared with rice straw returning, applying rice straw biochar decreased the cumulative CH4 and N2O emissions from paddy soil significantly by 64.2% - 78.5% and 16.3% - 18.4%, respectively. Whether planting rice or not, the cumulative N2O emission from paddy soil under the applications of rice straw biochar and life rubbish biochar was decreased significantly, compared with that without biochar amendment. Under the condition of no rice planting, applying life rubbish biochar reduced the cumulative CO2 emission significantly by 25.3%. Rice straw biochar was superior to life rubbish biochar in improving soil pH and available potassium content. Both rice straw biochar and life rubbish biochar could increase the soil organic carbon content significantly, but had less effects on the soil bulk density, total nitrogen and available phosphorus contents, cation exchange capacity (CEC), and grain yield. It was suggested that compared with rice straw returning, straw biochar was more effective in improving rice grain yield.


Wang Y.F.,Nanjing Agricultural University | Wang Y.F.,Zhejiang Academy of Agricultural Sciences | Shao L.L.,Zhejiang Academy of Agricultural Sciences | Shao L.L.,Zhejiang Biochar Engineering Technology Research Center | And 9 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2014

Interplanting grass is one of the important orchard floor management measures for avoiding negative potential effects, such as soil erosion, soil organic matter decrease, soil fertility reduction and deterioration of fruit quality induced by traditional orchard clean cultivation activities. The effect of interplanting grass on soil organic carbon and its active components is very critical for implementing soil ecological management, promoting the system of organic fruit production and improving the soil quality in orchards. Therefore, this study focused on addressing the issues relating to the effect of interplanting ryegrass (Lolium perenne L.) and hair vetch (Vicia villosa Roth) in peach orchard on soil total organic carbon (TOC) and its fractions, including microbial biomass carbon (MBC), water-soluble organic carbon (WSOC), light fraction organic carbon (LFOC), heavy fraction organic carbon (HFOC) and aggregates organic carbon. The results showed that compared to the clean cultivation control (CK), TOC, MBC and WSOC in interplanting ryegrass treatment (RG) were significantly increased by 5.13%, 76.4% and 18.1%, respectively. For hair vetch treatment (HV), LFOC and HFOC were significantly increased by 11.3% and decreased by 13.2% respectively when they are compared with CK. However, soil TOC, MBC and WSOC had no significant changes in HV. In addition, RG significantly raised the content of larger size fraction (>74 μm) aggregates of soil organic carbon, and reduced the smaller size fraction (<2000 μm). As for TOC improvement effect, interplanting ryegrass seemed to be better than hair vetch in peach orchard. MBC, WSOC, LFOC and HFOC can be served as sensitive indices for characterizing the changes of soil quality and soil organic carbon in peach orchards. © 2014, Science Press. All rights reserved.


Liu Y.-X.,Zhejiang Academy of Agricultural Sciences | Liu Y.-X.,Zhejiang Biochar Engineering Technology Research Center | Wang Y.-F.,Zhejiang Academy of Agricultural Sciences | Wang Y.-F.,Nanjing Agricultural University | And 12 more authors.
Chinese Journal of Applied Ecology | Year: 2013

A field experiment was conducted to investigate the effects of rice straw returning and rice straw biochar and life rubbish biochar application on the greenhouse gas (CH4, CO2 and N2O) emission from paddy soil, its physical and chemical properties, and rice grain yield. Compared with rice straw returning, applying rice straw biochar decreased the cumulative CH4 and N2O emissions from paddy soil significantly by 64.2%-78.5% and 16.3%-18.4%, respectively. Whether planting rice or not, the cumulative N2O emission from paddy soil under the applications of rice straw biochar and life rubbish biochar was decreased significantly, compared with that without biochar amendment. Under the condition of no rice planting, applying life rubbish biochar reduced the cumulative CO2 emission significantly by 25.3%. Rice straw biochar was superior to life rubbish biochar in improving soil pH and available potassium content. Both rice straw biochar and life rubbish biochar could increase the soil organic carbon content significantly, but had less effects on the soil bulk density, total nitrogen and available phosphorus contents, cation exchange capacity (CEC), and grain yield. It was suggested that compared with rice straw returning, straw biochar was more effective in improving rice grain yield.


PubMed | Zhejiang Biochar Engineering Technology Research Center and Zhejiang Academy of Agricultural Sciences
Type: Journal Article | Journal: Ying yong sheng tai xue bao = The journal of applied ecology | Year: 2014

A field experiment was conducted to investigate the effects of rice straw returning and rice straw biochar and life rubbish biochar application on the greenhouse gas (CH4, CO2 and N2O) emission from paddy soil, its physical and chemical properties, and rice grain yield. Compared with rice straw returning, applying rice straw biochar decreased the cumulative CH4 and N2O emissions from paddy soil significantly by 64.2% - 78.5% and 16.3% - 18.4%, respectively. Whether planting rice or not, the cumulative N2O emission from paddy soil under the applications of rice straw biochar and life rubbish biochar was decreased significantly, compared with that without biochar amendment. Under the condition of no rice planting, applying life rubbish biochar reduced the cumulative CO2 emission significantly by 25.3%. Rice straw biochar was superior to life rubbish biochar in improving soil pH and available potassium content. Both rice straw biochar and life rubbish biochar could increase the soil organic carbon content significantly, but had less effects on the soil bulk density, total nitrogen and available phosphorus contents, cation exchange capacity (CEC), and grain yield. It was suggested that compared with rice straw returning, straw biochar was more effective in improving rice grain yield.

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