Xu Li, Wang Ye, Zhang Wen
School of Chemical Engineering and Technology, Tianjin University Tianjin 300350 People's Republic of China
Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin 300350 People's Republic of China.
RSC Adv. 2019 Nov 29;9(67):39242-39251. doi: 10.1039/c9ra05713g. eCollection 2019 Nov 27.
Developing effective electrodes with long service lifetime for electrochemical degradation of dyes is of paramount importance for their practical industrial applications. We constructed a novel SnO-Sb electrode (Ti/TiO-NW/SnO-Sb electrode) based on a uniform TiO network structure decorated Ti plate (Ti/TiO-NW) for a long-term electrocatalytic performance. The SnO-Sb coating layer on this electrode was grown on the Ti/TiO-NW by pulse electrodeposition. The introduction of the three-dimensional TiO-NW enhances the bonding strength between the Ti substrate and the SnO-Sb surface coating. An accelerated life test shows that the service life of Ti/TiO-NW/SnO-Sb electrode is 11.15 times longer than that of the traditional Ti/SnO-Sb electrode. The physicochemical properties of the electrodes were characterized through SEM, EDS, XRD and HRTEM. In addition, through LSV, EIS, CV and voltammetric charge analysis, it is found that compared with the traditional electrode, the Ti/TiO-NW/SnO-Sb electrode possesses a higher oxygen evolution potential, a lower charge transfer resistance and a larger electrochemical active surface area. Besides, this novel electrode also exhibits an outstanding electrocatalytic oxidation ability for degradation of acid red 73 in simulated sewage. After a 5 hours' test, the removal efficiency of acid red 73 and the COD reached 98.6% and 71.8%, respectively, which were superior to those of Ti/SnO-Sb electrode (89.1% and 58.8%). This study highlights the excellent stability of the Ti/TiO-NW/SnO-Sb electrode and provides an energy-efficient strategy for dye degradation.
开发具有长使用寿命的有效电极用于染料的电化学降解对于其实际工业应用至关重要。我们基于装饰有Ti板（Ti/TiO-NW）的均匀TiO网络结构构建了一种新型的SnO-Sb电极（Ti/TiO-NW/SnO-Sb电极），以实现长期的电催化性能。该电极上的SnO-Sb涂层通过脉冲电沉积在Ti/TiO-NW上生长。三维TiO-NW的引入增强了Ti基底与SnO-Sb表面涂层之间的结合强度。加速寿命测试表明，Ti/TiO-NW/SnO-Sb电极的使用寿命比传统的Ti/SnO-Sb电极长11.15倍。通过SEM、EDS、XRD和HRTEM对电极的物理化学性质进行了表征。此外，通过LSV、EIS、CV和伏安电荷分析发现，与传统电极相比，Ti/TiO-NW/SnO-Sb电极具有更高的析氧电位、更低的电荷转移电阻和更大的电化学活性表面积。此外，这种新型电极在模拟污水中对酸性红73的降解也表现出出色的电催化氧化能力。经过5小时的测试，酸性红73的去除效率和COD去除率分别达到98.6%和71.8%，优于Ti/SnO-Sb电极（89.1%和58.8%）。这项研究突出了Ti/TiO-NW/SnO-Sb电极的优异稳定性，并为染料降解提供了一种节能策略。
