采用阳极电沉积方法在Mn-Mo氧化物阳极基础上,通过向镀液中加入稀土CeCl3制备了Mn-Mo-Ce氧化物阳极材料,采用循环伏安、Tafel极化曲线和电化学阻抗谱等电化学方法测试了Mn-Mo-Ce氧化物阳极的电催化性能;采用加速寿命实验及对氧化物阳极表面形貌观察,研究了Mn-Mo-Ce氧化物阳极材料在海水介质中的稳定性能.结果表明:稀土Ce的掺杂在一定程度上细化了Mn-Mo-Ce氧化物的微观结构,镀层结合致密,表面均匀分布有细小胞状物,微裂纹细密且数量较多,使电极表面的活性点数量增多,增大了真实表面积,提高了Mn-Mo-Ce氧化物电极的电催化性能;Mn-Mo-Ce氧化物阳极电解过程以氧化物溶解及剥落为主要破坏形式,Mn-Mo-Ce氧化物电极在海水介质中具有较好的稳定性,加速电解寿命可达1595 h,比Mn-Mo氧化物阳极高约207 h.
Mn-Mo-Ce oxide anode material was prepared on Mn-Mo oxide anode by electrodeposition in an electrolyte with addition of CeCl3.The electrocatalytic properties of Mn-Mo-Ce oxide anode were assessed by methods of cyclic voltammetry,Tafel polarization curves and electrochemical impedance spectroscopy.The durability of the Mn-Mo-Ce oxide anode in sea water was examined by accelerated test and the surface morphology of the oxide anode was characterized by SEM.Results show that with the doping of Ce-oxide,the formed Mn-Mo-Ce oxide coating is dense with a fine microstructure,of which on the surface there exists uniformly distributed fine vesiculates and a large number of microcracks,therewith resulting in the increase of the real surface area and the number of active points on the surface and in turn enhance the electrocatalytic performance of Mn-Mo-Ce oxide electrode.The main destruction form of the Mn-Mo-Ce oxide in the anode electrolysis process is dissolution and spallation of oxides.Mn-Mo-Ce oxide electrode has good durability in sea water,with a life time up to 1595 h,i.e.about 207 h higher than that of Mn-Mo oxide anode.
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