Carhons were prepared at different temperatures by pyrolytic treatment of phenolformaldehyde resin molded with ZnCl2 in advance. X-ray structure analyses have shown that these carbon are essentially amorphous with rat...Carhons were prepared at different temperatures by pyrolytic treatment of phenolformaldehyde resin molded with ZnCl2 in advance. X-ray structure analyses have shown that these carbon are essentially amorphous with rather loose structure of molecular size order with an interlayer distance of 0.36—0.37 nm. Using electrochemical methods, we have studied the insertion of lithium within these materials. Resole resins, heated to 580 ℃, have a reversible capacity of about 400 mA·h/g, which is beyond the theoretical capacity of graphite（372 mA·h/g） and discover that carbons with a smaller crystallite size and large interlayer distance have the larger discharge capacity.展开更多
A new method for the synthesis of the tit1e compounds 6 is described in this paper. Compounds 6 were obtained by an one-pot reaction process from β-dione and its analogues, 2-bromoethanol and carbon disulfide with po...A new method for the synthesis of the tit1e compounds 6 is described in this paper. Compounds 6 were obtained by an one-pot reaction process from β-dione and its analogues, 2-bromoethanol and carbon disulfide with potassium carbonate as the base. The possible mechanism is discussed. In this mechanism, a monoanion intermediate 3 is proposed, it reacts with 2-bromoethanol by a sequential nucleophilic and electrophilic reaction process to build the key intermediate 5. 6 is formed by the elimination of hydrosulfide from 5.展开更多
A new precusor of activated carbon material--sugar was pyrolyzed under many different conditions. Experiments were carried out to search for optimal pyrolyzing conditions. It was found that sugar should be carbonized ...A new precusor of activated carbon material--sugar was pyrolyzed under many different conditions. Experiments were carried out to search for optimal pyrolyzing conditions. It was found that sugar should be carbonized at 700 ℃ and activated with potassium hydroxide at 800 ℃. The activated carbon prepared from pyrolytic treatment of sugar is therefore potential candidates as electrode material of electric double layer capacitor.展开更多
Electric double layer capacitors using activated carbon as their electrodes are peculiar power sources with a high reliability, it is extremely resistant to oxidation, chemical and heat treatment. In this paper, we ha...Electric double layer capacitors using activated carbon as their electrodes are peculiar power sources with a high reliability, it is extremely resistant to oxidation, chemical and heat treatment. In this paper, we have developed the material of electric double layer capacitors prepared from pyrolytic treatment of phenol formaldehyde resin. The experiment results of its electrochemical properties show that this kind of capacitor has a large capacity, good cycle life and can be used in a large scale.展开更多
文摘Carhons were prepared at different temperatures by pyrolytic treatment of phenolformaldehyde resin molded with ZnCl2 in advance. X-ray structure analyses have shown that these carbon are essentially amorphous with rather loose structure of molecular size order with an interlayer distance of 0.36—0.37 nm. Using electrochemical methods, we have studied the insertion of lithium within these materials. Resole resins, heated to 580 ℃, have a reversible capacity of about 400 mA·h/g, which is beyond the theoretical capacity of graphite（372 mA·h/g） and discover that carbons with a smaller crystallite size and large interlayer distance have the larger discharge capacity.
文摘A new method for the synthesis of the tit1e compounds 6 is described in this paper. Compounds 6 were obtained by an one-pot reaction process from β-dione and its analogues, 2-bromoethanol and carbon disulfide with potassium carbonate as the base. The possible mechanism is discussed. In this mechanism, a monoanion intermediate 3 is proposed, it reacts with 2-bromoethanol by a sequential nucleophilic and electrophilic reaction process to build the key intermediate 5. 6 is formed by the elimination of hydrosulfide from 5.
文摘A new precusor of activated carbon material--sugar was pyrolyzed under many different conditions. Experiments were carried out to search for optimal pyrolyzing conditions. It was found that sugar should be carbonized at 700 ℃ and activated with potassium hydroxide at 800 ℃. The activated carbon prepared from pyrolytic treatment of sugar is therefore potential candidates as electrode material of electric double layer capacitor.
文摘Electric double layer capacitors using activated carbon as their electrodes are peculiar power sources with a high reliability, it is extremely resistant to oxidation, chemical and heat treatment. In this paper, we have developed the material of electric double layer capacitors prepared from pyrolytic treatment of phenol formaldehyde resin. The experiment results of its electrochemical properties show that this kind of capacitor has a large capacity, good cycle life and can be used in a large scale.
