Synthesis and Characterization of Novel Nanoporous Metals

新型纳米多孔金属的合成与表征

• 批准号: 15550171
• 负责人: KANOH Hirofumi
• 金额: $ 2.11万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15550171/
• 关键词: nanoporous material; platinum; palladium; templating method; mesoporous silica; polyvinyl alcohol; methanol oxidation

Nanoporous metallic platinum with a high specific surface area of 91 m^2/g was synthesized by a templating method using nonporous silica nanoparticles. The templating reaction is constituted of four steps : 1)a coating reaction of a Pt compound on the silica surface, 2)reduction of the Pt compound, 3)dissolution of the silica by alkaline treatment, and 4)removal of residual carbon in the nanoporous platinum by heat treatment. Thus, nanoporous metallic platinum, stabilized by a small amount of carbon, can successfully be obtained by a relatively convenient synthetic process. The electrode of this material were prepared using a glassy carbon as a substrate : NanoPt/GC. The electrocatalytic activity of NanoPt/GC shows a similar activity for methanol oxidation to that of the electrode using a commercial Pt black, and stronger resistivity againt a CO poisoning effect.Nanoparticles of metallic palladium surrounded by carbonaceous components were synthesized using a polyvinyl alcohol(PVA) film. The PVA film was immersed in Pd(NO_3)_2 aqueous solution and Pd ions were impregnated into the network structure of PVA film by sonication. Since the hydroxyl group on the side chain causes reduction of palladium ions to metallic palladium simultaneously, the additional reduction process is not needed in this process. The removal of carbonaceous components was tried by heat treatment in N_2 atmosphere but much content of carbon resided. The particle size of Pd is about 10 nm, which is characterized by SEM and XRD. The moderate oxidation treatment should be applied for removal of such carbonaceous components.

使用非孔二氧化硅纳米颗粒合成了具有91 m^2/g的高特异性表面积的纳米多孔金属铂。模板反应由四个步骤组成：1）Pt化合物在二氧化硅表面上的涂层反应，2）PT化合物的还原，3）通过碱处理溶解二氧化硅，4）通过热处理去除纳米多孔铂中残留的碳。因此，可以通过相对方便的合成过程成功获得少量碳稳定的纳米多孔金属铂。使用玻璃碳作为底物制备该材料的电极：Nanopt/GC。 NanOPT/GC的电催化活性显示了使用商业PT黑色与电极的甲醇氧化相似的活性，并且再次使用聚乙烯基酒精（PVA）合成了由碳质成分包围的金属钯的纳米颗粒。 PVA膜被浸入PD（NO_3）_2水溶液中，PD离子通过超声处理将PD离子浸入PVA膜的网络结构中。由于侧链的羟基同时导致钯离子还原为金属钯，因此在此过程中不需要额外的还原过程。在N_2气氛中进行热处理尝试，但碳含量很大。 PD的粒径约为10 nm，其特征是SEM和XRD。中等氧化处理应用于去除此类碳质成分。

项目成果

Synthesis and characterization of nanoporous metallic platinum

纳米多孔金属铂的合成与表征

• 发表时间: 2005
• 期刊: Colloid Surf.A-Physicochem.Eng.Asp 253
• 作者: M.Asai;T.Onoe;H.Kanoh;K.Kaneko
• 通讯作者: K.Kaneko

Z.M.Wang, K.Hoshinoo, K.Shishibori, H.Kanoh, K.Ooi: "Surfactant-mediated synthesis of a novel nanoporous carbon-silica composite"Chemistry of Materials. 15・15. 2926-2935 (2003)

Z.M.Wang、K.Hoshinoo、K.Shishibori、H.Kanoh、K.Ooi：“新型纳米多孔碳-二氧化硅复合材料的表面活性剂介导合成”15・15 2926-2935（2003）。

Cluster-Associated Filling of Water in Hydrophobic Carbon Micropores

• DOI: 10.1021/jp048934n
• 发表时间: 2004-08
• 期刊: Journal of Physical Chemistry B
• 影响因子: 3.3
• 作者: Takako. Kimura;H. Kanoh;T. Kanda;T. Ohkubo;Y. Hattori;Yasuyuki Higaonna;R. Denoyel;K. Kaneko

Gaseous adsorption of a silica-pillared layered manganese oxide

二氧化硅柱层状氧化锰的气态吸附

• 发表时间: 2004
• 期刊: Journal of Colloid and Interface Science 269
• 作者: Z.M.Wang;N.Yamashita;H.Kanoh
• 通讯作者: H.Kanoh

Surfactant-mediated synthesis of a novel nanoporous carbon-silica composite

• DOI: 10.1021/cm020965c
• 发表时间: 2003-06
• 期刊: Chemistry of Materials
• 影响因子: 8.6
• 作者: Zheng‐Ming Wang;K. Hoshinoo;K. Shishibori;H. Kanoh;K. Ooi