铂纳米线阵列电极对肼的电催化性能

Electric catalytic properties of platinum nanowire arrays electrode for hydrazine

以阳极氧化铝为模板,采用直流电沉积法制备了铂纳米线阵列电极。用扫描电子显微镜,X射线衍射等手段对铂纳米线阵列电极的形貌与结构进行了表征,同时应用循环伏安法和计时电流法测试研究了其对肼的电催化氧化性能.结果表明,铂能够在氧化铝模板孔洞中完整地沉积生长,且纳米线直径与氧化铝模板孔径一致,约为50nm;铂纳米线阵列电极对肼有明显的电催化活性,且其催化活性与肼浓度及扫描速率有关,肼浓度越大,催化活性越高,当肼浓度为50mmol/L时,电流密度可达48mA/cm2,约是铂柱电极的3倍;扫描速率越快,电流密度越大,且与峰电流密度的平方根成正比.铂纳米线阵列电极对肼也具有良好的催化稳定性和耐受性.

Platinum （Pt） nanowires array electrodes were prepared by direct current electro‐deposition in anodic aluminum oxide （AAO） template .The morphology and microstructures of the Pt/AAO were characterized by X‐ray diffraction and field‐emission scanning electron microscope ,the electro catalytic oxidation activities of hydrazine on Pt/AAO nanowire arrays electrodes were investigated and contrasted with that of Pt column electrode by cyclic voltammetry and chronoamperometry .The results indicate that Pt is deposited in AAO completely ,and the diameter of nanowires is about 50 nm ,consisting with that of AAO hole;for hydrazine ,Pt nanowires array electrodes have obvious electriccatalytic activity , and its catalytic activity is associated with hydrazine concentration and the scanning rate;the larger is the hydrazine concentration ,the higher is the catalytic activity ;when the concentration of hydrazine is 50mmol/L ,the current density is about up to 48 mA/cm2 ,three times that of Pt column electrode;meanwhile ,the faster is the scanning rate ,the greater is the current density ,and the scanning rate is proportional to the square root of the peak current density .Pt nanowire arrays electrodes for hydrazine also have better catalytic stability and tolerance .