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首页> 外文期刊>Journal of Materials Research >Influence of high-temperature treatment of granular activated carbon on its structure and electrochemical behavior in aqueous electrolyte solution
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Influence of high-temperature treatment of granular activated carbon on its structure and electrochemical behavior in aqueous electrolyte solution

机译：颗粒状活性炭的高温处理对其在电解质水溶液中的结构和电化学行为的影响

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摘要

Activated carbon Norit R3-ex (demineralized) was annealed at various temperatures (950-2700 ℃) in an argon atmosphere. The changes of the porosity of the products were characterized on the basis of N_2 adsorption isotherms (at 77 K). The texture of the samples was investigated by x-ray diffraction, Raman spectroscopy, and scanning electron microscopy. The presence of surface oxygen (Fourier transform infrared) and its content in the surface layer (from energy dispersive spectroscopy) were determined. The electrical resistivity of powdered samples was measured. Cyclovoltammetry of carbon (powdered electrodes) were carried out and the electrical double-layer capacitances were estimated from the cyclic voltammetry curves. Heat treatment increased the degree of crystallization of the samples, which was correlated with changes in their conductivity. A rapid drop in porosity (at 1800-2100 ℃) took place in parallel with a decrease in the electrical double layer capacity. The presence of surface oxygen as a result of oxygen chemisorption on freshly annealed carbon samples was confirmed using several methods.
机译：活性炭Norit R3-ex（脱盐）在氩气中于各种温度（950-2700℃）下退火。根据N_2吸附等温线（在77 K下）表征产物的孔隙率变化。通过X射线衍射，拉曼光谱和扫描电子显微镜研究样品的质地。确定表面氧的存在（傅立叶变换红外）及其在表面层中的含量（来自能量色散光谱法）。测量粉末状样品的电阻率。进行了碳（粉状电极）的循环伏安法，并根据循环伏安法曲线估算了双层电容。热处理增加了样品的结晶度，这与它们电导率的变化相关。孔隙率快速下降（在1800-2100℃）与双电层容量的下降同时发生。使用几种方法可以确定由于氧气在新鲜退火的碳样品上的化学吸附而导致的表面氧的存在。

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  • 来源
    《Journal of Materials Research》 |2010年第8期|P.1617-1628|共12页
  • 作者

    Stanislaw Biniak; rnMaciej Pakula; rnAndrzej Swiatkowski; rnMichal Bystrzejewski; rnStanislaw Blazewicz;

  • 作者单位

    Nicolaus Copernicus University, 87-100 Torun, Poland;

    rnNaval University of Gdynia, 81-103 Gdynia, Poland;

    rnMilitary University of Technology, 00-908 Warsaw, Poland;

    rnWarsaw University, 02-093 Warsaw, Poland;

    rnUniversity of Mining and Metallurgy, 30-059 Cracow, Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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