In the present communication,the electrooxidation of trioxane(1,3,5-trioxane) was studied as a new fuel for direct-oxidation-type fuel cells. Direct-oxidation-type fuel cells have attracted much attention in recent ye...In the present communication,the electrooxidation of trioxane(1,3,5-trioxane) was studied as a new fuel for direct-oxidation-type fuel cells. Direct-oxidation-type fuel cells have attracted much attention in recent years for the potential application as portable power sources;it can convert energy directly to electrical energy with high efficiency and low emission of pollution.Trioxane is a solid and favors the logistics of safe transportation as a fuel.The electro-oxidation and electro-sorption characteristics of this fuel at platinum electrode were investigated with electrochemical methods. The cyclic voltammetric result suggests that the electro-oxidation processes occur via chemisorption steps followed by surface reactions of adsorbed intermediates.The rate of electro-oxidation changed with the change of concentration of trioxane,acidity and temperature.The electro-oxidation of trioxane is carried out by an acid-catalyzed hydrolysis step in sulfuric acid solutions.展开更多
以升华物质2,4,6-三异丙基-1,3,5-三氧杂环己烷(ADD)为造孔剂,制备聚苯胺(PANI)包覆的中空核-壳结构硫复合物S@(ADD)@PANI。在化学制备的硫微粒上依次逐层包覆ADD和PANI,再在60℃下加热,使ADD挥发,制得S@(ADD)@PANI。SEM、透射扫描电镜(...以升华物质2,4,6-三异丙基-1,3,5-三氧杂环己烷(ADD)为造孔剂,制备聚苯胺(PANI)包覆的中空核-壳结构硫复合物S@(ADD)@PANI。在化学制备的硫微粒上依次逐层包覆ADD和PANI,再在60℃下加热,使ADD挥发,制得S@(ADD)@PANI。SEM、透射扫描电镜(TEM)和热重分析(TG)分析表明,制得的S@(ADD)@PANI的粒径约为1μm,硫含量为70. 7%。S@(ADD)@PANI的电化学性能优于化学制备硫。以200 m A/g的电流在1. 5~2. 8 V充放电,首次放电比容量为921 m Ah/g,第100次循环的放电比容量为500 m Ah/g。在相同的放电制度下,化学制备的硫电极的首次放电比容量为1 032. 4 m Ah/g,但稳定性差,第2次循环时的放电比容量就低于S@(ADD)@PANI,第100次循环的放电比容量下降到221. 9 m Ah/g。展开更多
文摘In the present communication,the electrooxidation of trioxane(1,3,5-trioxane) was studied as a new fuel for direct-oxidation-type fuel cells. Direct-oxidation-type fuel cells have attracted much attention in recent years for the potential application as portable power sources;it can convert energy directly to electrical energy with high efficiency and low emission of pollution.Trioxane is a solid and favors the logistics of safe transportation as a fuel.The electro-oxidation and electro-sorption characteristics of this fuel at platinum electrode were investigated with electrochemical methods. The cyclic voltammetric result suggests that the electro-oxidation processes occur via chemisorption steps followed by surface reactions of adsorbed intermediates.The rate of electro-oxidation changed with the change of concentration of trioxane,acidity and temperature.The electro-oxidation of trioxane is carried out by an acid-catalyzed hydrolysis step in sulfuric acid solutions.
文摘以升华物质2,4,6-三异丙基-1,3,5-三氧杂环己烷(ADD)为造孔剂,制备聚苯胺(PANI)包覆的中空核-壳结构硫复合物S@(ADD)@PANI。在化学制备的硫微粒上依次逐层包覆ADD和PANI,再在60℃下加热,使ADD挥发,制得S@(ADD)@PANI。SEM、透射扫描电镜(TEM)和热重分析(TG)分析表明,制得的S@(ADD)@PANI的粒径约为1μm,硫含量为70. 7%。S@(ADD)@PANI的电化学性能优于化学制备硫。以200 m A/g的电流在1. 5~2. 8 V充放电,首次放电比容量为921 m Ah/g,第100次循环的放电比容量为500 m Ah/g。在相同的放电制度下,化学制备的硫电极的首次放电比容量为1 032. 4 m Ah/g,但稳定性差,第2次循环时的放电比容量就低于S@(ADD)@PANI,第100次循环的放电比容量下降到221. 9 m Ah/g。
