摘要：
Electrochemical performances of LiCoO2 as a candidate material for supercapacitor are systematically investigated. LiCoO2 nanomaterials are synthesized via hydrothermal reaction with consequent calcination process. And the particle size increases as the calcination temperature rises.LCO-650 sample with the largest particle size displays the maximum capacitances of 817.5 Fg-1with the most outstanding capacity retention rate of 96.8% after 2000 cycles. It is shown that large particle size is beneficial to the electrochemical and structural stability of Li CoO2 materials. We speculate that the micron-sized waste LiCoO2 materials have great potential for supercapacitor application. It may provide a novel recovered approach for spent LIBs and effectively relieve the burdens on the resource waste and environment pollution.
期刊：
International Journal of Hydrogen Energy,2014年39(21):11055-11060 ISSN：0360-3199
通讯作者：
Ding, Liangzhong
作者机构：
[Jiao, Lifang; Yuan, Huatang; Zhao, Yanping] Nankai Univ, Inst New Energy Mat Chem, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Key Lab Adv Energy Mat Chem MOE,Tianjin Key Lab M, Tianjin 300071, Peoples R China.;[Zhong, Tongsheng; Ding, Liangzhong] Hunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China.
通讯机构：
[Ding, Liangzhong] H;Hunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China.
关键词：
LiBH4;Hydrogen storage;Catalysis;CoNiB
摘要：
2LiBH(4)/MgH2 system is a representative and promising reactive hydride composite for hydrogen storage. However, the high desorption temperature and sluggish desorption kinetics hamper its practical application. In our present report, we successfully introduce CoNiB nanoparticles as catalysts to improve the dehydrogenation performances of the 2LiBH(4)/MgH2 composite. The sample with CoNiB additives shows a significant desorption property. Temperature programmed desorption (TPD) measurement demonstrates that the peak decomposition temperatures of MgH2 and LiBH4 are lowered to be 315 degrees C and 417 degrees C for the CoNiB-doped 2LiBH(4)/MgH2. Isothermal dehydrogenation analysis demonstrates that approximately 10.2 wt% hydrogen can be released within 360 min at 400 degrees C. In addition, this study gives a preliminary evidence for understanding the CoNiB catalytic mechanism of 2LiBH(4)/MgH2 Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
摘要：
nbutyl phydroxybenzoate was synthesized by the esterification of nButyl alcohol with phydroxybenzoic acid in the presence of sodium bisulfate monohydrate. The results obtained indicate that sodium bisulfate monohydrate possesses a fairly high catalytic activity for the esterification reaction. The molar ratio of phydroxybenzoic acid/nbutyl alcohol and the effect of the amount of catalyst used and the reaction time on the yield of ester have been studied. The yield of the ester obtained under the typical reaction conditions (phydroxybenzoic acid/nbutyl alcohol/ sodium bisulfate = 1 mol/ 2 mol /0.072 mol, refluxing and watersegrating for 5 h) is 92.8%. Sodium bisulfate monohydrate catalyst can be easily recovered and reused.
摘要：
Benzil is an important photosensitive initiator of organic synthesis intermediates,medicinal intermediates and ultraviolet solidified resin (UVresin),and is usually prepared by oxidizing benzoin, The oxidizers and methods reported are mainly;(PhCH_2Et_3N)~+Br~-/(PhCO)_2O_2/MeCN~[1],DMSO/(COCL)_2 CH_2CL_2~[2],CrO_3·CH_3NH_2·HCl/Al_2O_3~[3], the metallorganic compound~[4],microwave radiation~[5],etc.The reaction conditions of some methods are harsh, the toxicity is heavy, the reaction reagent is expensive, the preparation is difficult, the aftertreatment is tedious or the conversion ratio of materials is low.Cupric compound is a kind of weak oxidizer.Up till now there is only the report of oxidizing benzoin with cupric sulfate-pyridine~[6] with cupric acetate-acetic acid~[7].This paper studies the problem of oxidizing benzoin by using cupric nitrate, cupric chloride, cupric sulfate,cupric acetate and cupric subcarbonate as oxidizers.The experimental results indicate that these cupric compounds can all oxidize benzoin into benzil in acetic acid solutions, and cupric nitrate is the best one.Its product has these adventages of fine color and luster,high yield, available raw material and simple and easy operation and it has the prospects of being used widely.
摘要：
1 INTRODUCTION
Catalytic hydrodechlorination is an elegant reaction for disposal of environmentally hazardous chlorocarbons,such as chloro-benzene[1].Development of a new catalyst with excellent stability is necessary due to the deactivation of supported noble metal catalysts[1].However the modification of catalytic properties of catalysts in hydrodechlorination reaction by introducing stable ligands to noble metals has been the least studied.Here the synthesis of Pd(Ⅱ) 2,9,16,23-symetrically tetrasubstituted phthalocyanines PdPTX4 (where X=-H,-NO2,-NH2 respectively) from phthalimide derivatives is reported,and their application as catalysts in hydrodechlorination of chlorobenzene,which is a representative environmentally hazardous materials is discussed.
