微波辅助超快速制备泡沫镍支撑的Fe-Ni复合氧化物促进甲醇催化氧化反应

Microwave-assisted ultra-fast preparation of Fe-Ni composite oxides supported by nickel foam as efficient catalysts for methanol oxidation reaction

本文通过微波辅助加热法快速制备了负载于泡沫镍的Fe-Ni复合氧化物(Fe-Ni/NF)。XRD图谱表明Fe-Ni/NF表面的Fe-Ni复合氧化物具有低结晶度的特征。采用循环伏安法观察了Fe-Ni/NF在碱性介质中的电催化特性。与单金属催化电极相比(Fe/NF、Ni/NF),Fe-Ni/NF具有更好的催化性能,在含有0.5mol/L CH_(3)OH的6mol/LKOH的电解液中,其初始氧化电位为0.41V vs.Hg/HgO,并且在0.6V vs.Hg/HgO电位下,阳极氧化电流密度为76.88mA/cm^(2)。Fe-Ni/NF电极具有良好的长期循环稳定性,1000次循环后甲醇的催化电流仍保持初始值的87%。Fe-Ni/NF电极有望成为碱性直接甲醇燃料电池的候选催化电极。

Fe-Ni composite oxides loaded on the surface of nickel foam(Fe-Ni/NF)are rapidly prepared by microwave-assisted heat-ing.XRD pattern shows that Fe-Ni composite oxide on the surface of Fe-Ni/NF has low crystallinity.The electrocatalytic properties of Fe-Ni/NF in an alkaline medium are investigated by cyclic voltammetry.Compared with the single metal catalyst electrodes(Fe/NF,Ni/NF),Fe-Ni/NF shows higher catalytic performance.In 6 mol/L KOH electrolyte with 0.5 mol/L CH_(3)OH,the onset poten-tial of Fe-Ni/NF is 0.41 V vs.Hg/HgO,and the anodic oxidation current density is 76.88 mA/cm^(2) at the potential of 0.6 V vs.Hg/HgO.Fe-Ni/NF electrode displays good long-term cycle stability,and the catalytic current of methanol remains 87%of the initial value after 1000 cycles.Fe-Ni/NF electrode is expected to be a candidate electrode for basic direct methanol fuel cells.