针对目前低浓度氯化钠电解过程中存在的氧化物尺寸稳定阳极(DSA)使用寿命短以及Pt电极使用量高的问题,本研究通过磁控溅射法制备了具有沿[111]方向择优生长的Pt/Ti电极.SEM结果显示,磁控Pt表面平整,分散均匀,粒度大小为10 nm;通过XPS表征,未见到基体Ti的特征峰,说明其表面覆盖度好.电化学循环伏安曲线(CV)显示,磁控Pt的电化学面积最小,仅为1.08cm2,接近电极表观面积;磁控Pt氧区吸附电量和氢区吸附电量的比仅为0.83,说明其对氧吸附能力较差,不利于发生析氧反应.在单位电化学面积上,当电极电势为1.6 V时,磁控Pt的析氯电流达到0.085 A/cm2,分别是电沉积Pt和热分解Pt的3.27和49.0倍,说明磁控Pt单位活性位点上具有很高的析氯反应活性.在此基础上,进一步研究表明磁控Pt电极析氯反应的Tafel斜率为44.3 mV/dec,其析氯反应机理符合Volmer-Heyrovsky机理,速控步骤为电化学复合脱附步骤.
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