水热工艺条件对纳米Ni-Ti-O/泡沫镍复合电极电催化性能影响

Effect of hydrothermal process on electrocatalytsis performance of Nano Ni-Ti-O/Ni foam composite electrodes

采用了水热合成法在泡沫镍支架表面制备了Ni-Ti-O纳米结构。通过扫描电镜(SEM)和循环伏安法研究了镍支架上Ni-Ti-O纳米结构的微观形貌和对甲醇的催化氧化性能。研究结果表明HCl浓度对纳米Ni-Ti-O的形成有重要影响。浓度低时,获得的纳米片量偏少,性能较差。如果浓度过高,会破坏Ni的整体结构也会导致性能下降。随温度的上升和保温时间的延长,电化学性能先升后降。在含5 mL钛酸丁酯、3 mLHCl和72 mLH_2O的水热体系中,80℃水热保温6 h后制备出来的样品具有最优的甲醇催化性能。

Ni-Ti-O nanostructure was fabricated on the surface of Ni foam by hydrothermal method. Scanning electron microscopy（SEM） and cyclic voltammetry （CV） ware used to in- vestigate the Ni-Ti-O nanostructure and the methanol catalytsis performance of electrodes. The resuhs show HC1 concentration has an important effect on the formation of nano Ni-Ti- O. When the concentration is low, the amount of nano Ni-Ti-O is less and the performance is worse. If the concentration is too high, it will damage the overall structure of Ni foam re- sulting to degradation of performance. With the increase of temperature and the prolonging ofholding time, the electrochemical performance firstly increases and then decreases. The sam-ples prepared with the solution system with 5 mLTBT,3 mLHC1 and 72 mLH2O at 80 ℃ for6 h has the best methanol catalytic performance.