将含氮聚合物聚苯胺(PANI)均匀地担载到具有大比表面积、多级孔结构和高导电性的3D碳纳米笼(CNC)表面,再热解PANI制得了N掺杂位富集于表面、且具有优良导电性的碳基纳米材料.通过改变热解温度和前驱物中PANI的含量,对热解产物的表面N含...将含氮聚合物聚苯胺(PANI)均匀地担载到具有大比表面积、多级孔结构和高导电性的3D碳纳米笼(CNC)表面,再热解PANI制得了N掺杂位富集于表面、且具有优良导电性的碳基纳米材料.通过改变热解温度和前驱物中PANI的含量,对热解产物的表面N含量和导电性进行了调控.优化得到的NCNC-2-900催化剂具有优异的氧还原反应(ORR)催化性能,其起始电位高(-46 m V vs Ag/Ag Cl),明显优于体相N掺杂的CNC(-105 m V),且稳定性好(运行10 h后仍保留96%活性).该结果表明在保持良好导电性的同时增加表面N掺杂位是提高碳基材料ORR活性的有效途径.展开更多
A simple electrochemical method for the in situ preparation of homogeneously dispersed gold-polyaniline core/shell nanocomposite particles with controlled size on the highly oriented pyrolytic graphite(HOPG)was demons...A simple electrochemical method for the in situ preparation of homogeneously dispersed gold-polyaniline core/shell nanocomposite particles with controlled size on the highly oriented pyrolytic graphite(HOPG)was demonstrated.The HOPG surface was modified preferentially by covalent bonding of a two-dimensional 4-aminophenyl monolayer employing diazonium chemistry.AuCl4 -ions were attached to the Ar-NH2 termination and reduced electrochemically.This results in the formation of Au nuclei that could be further grown into gold nanoparticles.The formation of polyaniline as the shell wrap of Au nanoparticle was established by localized electro-polymerization.These core-shell nanocomposites prepared were characterized by AFM and cyclic voltammetry.The results show that the gold-polyaniline core-shell composites on HOPG have a mean particle size of 100 nm in diameter and the polyaniline shell thickness is about 15 nm.展开更多
文摘将含氮聚合物聚苯胺(PANI)均匀地担载到具有大比表面积、多级孔结构和高导电性的3D碳纳米笼(CNC)表面,再热解PANI制得了N掺杂位富集于表面、且具有优良导电性的碳基纳米材料.通过改变热解温度和前驱物中PANI的含量,对热解产物的表面N含量和导电性进行了调控.优化得到的NCNC-2-900催化剂具有优异的氧还原反应(ORR)催化性能,其起始电位高(-46 m V vs Ag/Ag Cl),明显优于体相N掺杂的CNC(-105 m V),且稳定性好(运行10 h后仍保留96%活性).该结果表明在保持良好导电性的同时增加表面N掺杂位是提高碳基材料ORR活性的有效途径.
基金Project(50721003)supported by the Creative Research Group of National Natural Science Foundation of ChinaProject(50825102)supported by the National Science Fund for Distinguished Young Scholars,China
文摘A simple electrochemical method for the in situ preparation of homogeneously dispersed gold-polyaniline core/shell nanocomposite particles with controlled size on the highly oriented pyrolytic graphite(HOPG)was demonstrated.The HOPG surface was modified preferentially by covalent bonding of a two-dimensional 4-aminophenyl monolayer employing diazonium chemistry.AuCl4 -ions were attached to the Ar-NH2 termination and reduced electrochemically.This results in the formation of Au nuclei that could be further grown into gold nanoparticles.The formation of polyaniline as the shell wrap of Au nanoparticle was established by localized electro-polymerization.These core-shell nanocomposites prepared were characterized by AFM and cyclic voltammetry.The results show that the gold-polyaniline core-shell composites on HOPG have a mean particle size of 100 nm in diameter and the polyaniline shell thickness is about 15 nm.
