新型的钛基Ni-Sn/Ti电极的制备及对甲醇氧化反应的电催化活性

利用电热法，一步制备出新型的钛基Ni-Sn/Ti电极(Ni8Sn/Ti, Ni7Sn3/Ti 和 Ni/Ti)。扫描电镜（SEM）图像表明，催化剂以片状的纳米颗粒形式沉积于钛基体上。利用电化学伏安技术、电位阶跃法和电化学交流阻抗谱（EIS），研究了这些电极在1mol.L�1NaOH溶液中对甲醇氧化反应的电催化活性。研究表明，与Ni7Sn3/Ti，Ni/Ti以及多晶镍电极相比，Ni8Sn/Ti电极对甲醇氧化反应表现出更高的阳极氧化电流和更低的起始电位。EIS分析表明，在本文所考察的阳极电位和甲醇浓度下，Ni8Sn/Ti电极对甲醇氧化反应显示出极低的电荷传递电阻。结果表明，这种新型的钛基Ni8Sn/Ti电极对甲醇氧化反应具有极高的电催化活性。

Fabrication of Novel Titanium‐supported Ni‐Sn Catalysts for Methanol Electro‐oxidation

Novel titanium‐supported Ni‐Sn/Ti electrodes (Ni₈Sn/Ti, Ni₇Sn₃/Ti and Ni/Ti) have been prepared using a hydrothermal method by a one step process. The scanning electron microscopy (SEM) images show that the catalyst particles are present as nano‐scale flakes. Their electrochemical activity for methanol oxidation in 1 mol·L^?1 NaOH was evaluated using voltammetric techniques, chronoamperometric measurements and electrochemical impedance spectra (EIS). It was found that the Ni₈Sn/Ti electrode presents higher anodic currents and lower onset potential for methanol oxidation than Ni₇Sn₃/Ti, Ni/Ti and polycrystalline Ni electrodes. The EIS data indicate that under conditions of various anodic potentials and methanol concentrations, the Ni₈Sn/Ti electrode displays significantly lower charge transfer resistances and high electrocatalytic activity towards methanol oxidation.