生物质活性炭的微结构调控及其储氢性能研究  

Microstructure control and hydrogen storage of activated carbon derived from biomass waste

作　　者：周向阳[1,2] 耿振[2,3] 张存满[1,2] 王达斌[1,2] 胡振悦 

机构地区：[1]同济大学汽车学院,上海201804 [2]同济大学新能源汽车工程中心,上海201804 [3]同济大学材料科学与工程学院,上海201804

出　　处：《功能材料》2016年第3期1-6,共6页Journal of Functional Materials

基　　金：国家高技术研究与发展计划(863计划)资助项目(2012AA053305);科技部国际合作资助项目(2010DFA64080)

摘　　要：以生物质玉米芯为原料,采用氢氧化钾活化的方法制备了一系列具有高比表面积的活性炭.制备的样品通过热重和氮气吸脱附进行表征,并对样品进行了储氢性能测试.结果表明,碱碳比和活化温度对活性炭的比表面积和总孔容有很大影响,并且随碱碳比和活化温度的升高,活性炭中的微孔比例逐渐减小.储氢测试结果表明,碱碳比为4,活化温度为850℃时,样品的储氢性能最好（-196℃、0.1MPa下为3.21%,4.0MPa下为5.80%）.分析活性炭储氢量与微孔孔容的关系可知,吸附氢气最有效孔径随气体压力的变化而变化.0.1 MPa下,孔径为1.5-2nm 的孔最有利于氢气吸附,而更高压力下（4.0 MPa）,孔径为0.85-1.5nm 的孔型更有利于氢气吸附.A series of super activated carbon have been prepared by potassium hydroxide activation of corncob.The as-obtained samples were characterized by TGA together with N2-sorption and the hydrogen storage performance was investigated.The results show the surface area and total pore volume of the activated carbon were highly depended on the activation temperature and KOH/C ratio,and the ratio of microporous in activated carbon decreases with the increase of activation temperature and KOH/C ratio.The hydrogen uptake results showed the sample achieved the highest hydrogen adsorption(3.21wt% at-196 ℃,0.1 MPa and 5.80wt% at-196 ℃,4.0 MPa)when KOH/C ratio was 4and activation temperature was 850 ℃.Correlation analysis between the hydrogen storage capacity of the activated carbon and the micropore volume revealed that the most effective pore size for adsorbing H2 changed at different pressure.High-pressure(4.0 MPa)hydrogen adsorption mainly occurs in the pore size of 0.85-1.5nm which was different from the ambient pressure(the pore of 1.5-2nm was in favor of hydrogen adsorption).

关 键 词：玉米芯 氢氧化钾 活性炭 吸附储氢 

分 类 号：TB32[一般工业技术—材料科学与工程] TB34