化学还原氧化石墨烯修饰PbO2电极及催化降解酸性红G

为了提高Ti/PbO₂电极的稳定性与催化氧化能力，将化学还原氧化石墨烯（RGO）以共沉积的方法修饰于β-PbO₂层.通过扫描电镜（SEM），X射线衍射仪（XRD），循环伏安法（CV），电化学交流阻抗（EIS），产羟基自由基（·OH）能力，强化寿命等测试方法对电极性能进行表征，并以酸性红G（ARG）为目标降解物，评估PbO₂-RGO电极的催化效果.结果表明，电极经RGO改性后晶型仍为β-PbO₂，析氧过电位由1.60V升至1.83V，膜阻抗由144 Ω/cm²降至16.2 Ω/cm²，强化寿命提升了43.6%.通过ARG降解实验表明，改性后的PbO₂-RGO电极催化性能均有所提高，其中PbO₂-RGO（0.05）电极具有最优的催化能力，120min内对ARG的脱色率可达到98.5%，同时对COD的去除率可达76.89%.

Chemically reduced graphene oxide modified PbO2 electrodes and the degradation of acidic red G

It is important to improve the stability and catalytic capacity of Ti/PbO₂ electrode for long term running of electrochemical process. In the present work chemically reduced graphene oxide (RGO) was included into β-PbO₂ layer by using codeposition method to improve the performance of the electrode. The modified electrode was characterized by using scanning electron microscopy (SEM), X-ray diffractometry (XRD), cyclic voltammetry (CV) and electrochemical alternating impedance (EIS). Its capacity in producing hydroxyl radical (·OH) and lifetime was also checked. The catalytic effect of the PbO₂-RGO electrode was evaluated using acidic red G (ARG) as the target degradant. The results showed that the modified PbO₂-RGO electrode was β-PbO₂ in nature. After modification the oxygenation overpotential increased from 1.60V to 1.83V, While the membrane impedance decreased from 144 Ω/cm² to 16.2 Ω/cm² with an increment of lifespan by 43.6%. The ARG degradation experiments demonstrated significant improvement on catalytic performance after electrode modification. Under optimized condition PbO₂-RGO (0.05) electrode achieved decolorization of ARG for 98.5% and COD removal of 76.89% within 120min.