Synthesis and characteristics of graphene oxide-derived carbon nanosheet-Pd nanosized particle composites.
Synthesis and characteristics of graphene oxide-derived carbon nanosheet-Pd nanosized particle composites.
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DOI：
10.1021/la9040166
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发表时间：
2010-03
期刊：
影响因子：
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通讯作者：
Zhong-liang Hu;M. Aizawa;Zheng‐Ming Wang;N. Yoshizawa;H. Hatori
中科院分区：
文献类型：
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作者：
Zhong-liang Hu;M. Aizawa;Zheng‐Ming Wang;N. Yoshizawa;H. Hatori
以氧化石墨（GO）和双乙二胺钯（Pd（en）（2）（2+））为前驱体，制备了碳纳米片（CNS）-钯纳米粒子（NP）复合材料，并对其结构和吸附性能进行了研究。发现Pd（en）（2）（2+）络合物离子可以高效地插入GO层中以形成含有大量Pd（约12重量%）的层状结构。通过随后的化学还原，Pd NP（尺寸为2-6 nm）良好地分散在CNS之间以形成CNS-Pd NP复合物并用作间隔物以增加复合物的孔隙率。氢吸附结果表明，Pd NPs和CNS在氢吸附中起重要作用，特别是在较低的温度下和具有缺陷位点的CNS，这使得H（2）吸附大于迄今报道的其他Pd负载的纳米碳材料。这种由CNSs稳定的具有大含量Pd NPs（20- 25wt%）的独特复合纳米结构有望应用于与H（2）相关的催化、传感等领域。
Carbon nanosheet (CNS)-Pd nanosized particle (NP) composites were synthesized by using graphite oxide (GO) and bis(ethylenediamine)palladium(II) (Pd(en)(2)(2+)) as the precursors, and their structure and adsorption properties were examined. It was found that the Pd(en)(2)(2+) complex ions can be intercalated into GO layers highly efficiently to form a layered structure containing a large amount of Pd (approximately 12 wt %). By the subsequent chemical reduction, Pd NPs (2-6 nm in size) are well dispersed between CNS to form a CNS-Pd NP composite and serve as spacers to increase the porosity of the composite. Hydrogen adsorption results demonstrate that both Pd NPs and CNS play important roles in hydrogen adsorption, particularly at a lower temperature and for CNS with deficient sites, which bring about a H(2) adsorption greater than those on other Pd-loaded nanocarbon materials reported so far. The unique composite nanostructure having large contents of Pd NPs (20-25 wt %) stabilized by CNSs is hopeful to be applied to the fields of H(2)-related catalysis, sensing, and so forth.