一维亚微米多钼酸盐形貌可控合成及氧的电催化还原研究(英文)

Morphology-controlled Synthesis of 1D Submicro-structured Polyoxomolybdate Towards Electrocatalytic Oxygen Reduction

通过调节反应pH值和反应物种实现了一维亚微米多钼酸盐的控制合成,以钼酸铵和十二烷基苯磺酸钠为原料,在pH=6时制备出亚微米线,在pH=2时制备出亚微米棒,而以钼酸铵和氯化钠为原料,在pH=6时制备出纳米带.在pH=6时,纳米材料在长胶束内生长成亚微米线,而pH值降低至2时,过多的H+不仅会形成大量的Mo3O102-,还会使得胶束变短,因此使得亚微米材料变短,成为亚微米棒.在没有模板剂十二烷基苯磺酸钠时,多钼酸铵就会长成结构更为稳定的纳米带.循环伏安测试结果表明在有机溶剂中,多钼酸盐的亚微米棒对氧电催化还原具有优异活性.研究表明,由于有机醇能与电解质溶液中的H+反应,因此有机醇能显著促进一维多钼酸盐亚微米材料的氧的电催化活性.

1D submicro-structured polyoxomolybdate submicro-wires,submicro-rods and nanobelts were synthesized by altering the pH value and reactants.Submicro-wires could be obtained by reacting（NH 4） 6 Mo 7 O 24.4H 2 O with sodium dodecyl benzene sulfonate（SDBS） at pH = 6,and that for submicro-rods at pH = 2.However,nanobelts could be synthesized by reacting（NH 4） 6 Mo 7 O 24.4H 2 O with NaCl at pH = 6.In solution of pH = 6,polyoxomolybdate should grow up submicro-wires in long micelles.At pH = 2,not only more Mo 3 O 10 2,but also short micelles formed by excessive H ＋ cations,which leaded to the submicro-rods.Without template SDBS,polyoxomolybdate may exist in stable nanobelts.Cyclic voltammetry results indicated that polymolybdate submicro-rods exhibited excellent activity for oxygen electroreduction in organic solvent.Because alcohol could react with H ＋ in the electrolyte,the activity of oxygen electroreduction over polymolybdate could be obviously promoted in the presence of alcohol.