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1、?24?5?Vol.24 No.52 0 1 0?10?CHINESE JOURNAL OF MATERIALS RESEARCHOctober 2 0 1 0?1,2?1?2?21.?1000832.?49931?,?PMNPT?,?PMNPT?,?,?8 MPa?PMNPT?(NAC)?15%,?0.83%?1%?1.25%?36.5%?39.3%?43.9%?,?,?,?,?TQ424?1005-3093(2010)05-0550-05Influence of Piezoelectric Element on Hydrogen Adsorptionof Ptsupported Activ
2、ated CarbonLI Xuan1,2NI Wen1HUANG Jianyang2ZHANG Zheng21.State Key Laboratory for HighEfficient Mining and Safety of Metal Mines of Ministry of Education,School of Civil and Environment Engineering,University of Science and Technology Beijing,Beijng 100083,China2.Department of Materials Science and
3、Engineering,Michigan Technological University,Houghton,Michigan 49931,USAManuscript received February 24,2010;in revised form May 10,2010.*To correspondence should be addressed,Tel:(010)82376592,Email:ABSTRACTMixing Ptcoated activated carbon with secondary activated carbon as adsorbent wasused for h
4、ydrogen storage.Behaviors of hydrogen adsorption on Ptsupported activated carbon in thepresence of a piezoelectric element were investigated.Hydrogen storage in activated carbons can beincreased by secondary hydrogen spillover from a supported Pt catalyst.The piezoelectric element isable to autogeno
5、usly generate charges in hydrogen pressure.The observed adsorption enhancementsof NAC,Pt/NAC1,Pt/NAC2 and Pt/NAC3 are 15%,36.5%,39.3%and 43.9%,respectively.Thegreater enhancement observed from hydrogen adsorption on Pt/NAC samples can be attributed to chargesgenerated by PMNPT facilitate dissociatio
6、n of hydrogen molecules into hydrogen atoms.The easieraccessibility of the atomic orbital might favor the electron transfer from the atomic hydrogen to chargedcarbon.KEY WORDSinorganic nonmetallic materials,activated carbon,hydrogen adsorption,hydrogenspillover,piezoelectric element?,?1?,?2010?2?24?
7、2010?5?10?:?,?2,3?,?4?vander Waals?,?vander Waals?,?195?2 MPa?(BET?5?:?5515?:?5515?:?5513200 m2/g)?(?)?6.9%5,?1%610?Yang?1113,?:?,?,?14?Lueking?Yang?,?1519?Hwang?,?(hydrogencluster)20?Liu?21,?Shi?22,?,?,?,?,?1?:Norit A supra?(NAC)?5%(?,?)?(Pt/AC)?NAC?Pt/AC?,?,?NAC?Pt/AC?BET?(?Micromeritics ASAP2000?
8、)?1?PCTPro 2000?23?(PMNPT,Morgan Electro Ceramics,?d33?12002000 pC/N)?,?,?PMNPT?,?,?PCTPro 2000?,?(PCT?)?(21?)?,?8 MPa?3?,?3?2%5%?2,3,?BET?,?,?,?1000 m2/g?24?,?,?PMNPT?2?,PMNPT?1?1?,?8 MPa?Norit A Supra?1000 m2/g?(?)?0.233%,?0.83%?1%?1.25%?0.255%/1000 m2/g?0.281%/1000 m2/g?0.301%/1000 m2/g?,?,?,?25:
9、(1)?;(2)?;(3)?,?;?1?Table 1 BET surface area and of activated carbon samples(mass fraction)SampleMix ratio(NAC:Pt/NAC)Pt contentBET surface area/(m2/g)NAC1836Pt/AC5%535Pt/NAC15:10.83%1593Pt/NAC24:11%1522Pt/NAC33:11.25%1485552?24?552?24?552?24?1?Fig.1 Hydrogen adsorption of activated carbon sam-ples
10、with different Pt content under variouspressures?2?PMNPT?Fig.2 Hydrogen adsorption of activated carbon sam-ples with different Pt content and Pt undervarious pressures(4)?,?,?,?PMNPT?,?2?PMNPT?,?8 MPa?NAC?0.269%/1000 m2/g,PMNPT?15%?,?PMNPT?0.83%?1%?1.25%?0.349%/1000 m2/g?0.391%/1000 m2/g?0.433%/1000
11、 m2/g,PMNPT?36.5%?39.3%?43.9%?NAC?3?Pt?PMNPT?Fig.3 Hydrogen adsorption of activated carbon sam-ples with Pt and PMNPT under various pres-sures?1.25%?PMNPT?3?3?,?PMNPT?,?PMNPT?PMNPT?,NAC?PMNPT?,?NAC?NAC?,?;?(H)(H2)n),?NAC?,?HH?26,?HH?,?,?HH?,?,?PMNPT?,PMNPT?PMNPT?d33?,PMNPT?,?PMNPT?,?PMNPT?,?PMNPT?,?
12、,?HH?,?5?:?5535?:?5535?:?553?,?,?,?,?V+(H2)n?Co+(H2)n?Sc+(H2)n?Fe+(H2)16?Ti+(H2)16?Ni+(H2)n?Cu2+(H2)n?2729;?,?CuH2?AgH2?AuH2?AuH4?30?,?,?,PMNPT?3?,?21?8MPa?(NAC)?0.233%/1000 m2/g,?0.83%?1%?1.25%?0.255%/1000 m2/g?0.281%/1000 m2/g?0.301%/1000 m2/g?PMNPT?,?21?8 MPa?PMNPT?NAC?Pt/NAC1?Pt/NAC2?Pt/NAC3?15%
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