Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China.
Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China.
Sci Total Environ. 2021 Mar 10;759:143459. doi: 10.1016/j.scitotenv.2020.143459. Epub 2020 Nov 9.
Nowadays, it is a great challenge to minimize the negative impact of hazardous organic compounds in the environment. Highly efficient hydrogen peroxide (HO) production through electrochemical methods with gas diffusion electrodes (GDEs) is greatly demand for degradation of organic pollutants that present in drinking water and industrial wastewater. The GDEs as cathodic electrocatalyst manifest more cost-effective, lower energy consumption and higher oxygen utilization efficiency for HO production as compared to other carbonaceous cathodes due to its worthy chemical and physical characteristics. In recent years, the crucial research and practical application of GDE for degradation of organic pollutants have been well developed. In this review, we focus on the novel design, fundamental aspects, influence factors, and electrochemical properties of GDEs. Furthermore, we investigate the generation of HO through electrocatalytic processes and degradation mechanisms of refractory organic pollutants on GDEs. We describe the advanced methodologies towards electrochemical kinetics, which include the enhancement of GDEs electrochemical catalytic activity and mass transfer process. More importantly, we also highlight the other technologies assisted electrochemical process with GDEs to enlarge the practical application for water treatment. In addition, the developmental prospective and the existing research challenges of GDE-based electrocatalytic materials for real applications in HO production and wastewater treatment are forecasted. According to our best knowledge, only few review articles have discussed GDEs in detail for HO production and their applications for degradation of organic pollutants in water.
如今，如何将环境中有害有机化合物的负面影响降至最低是一个巨大的挑战。通过气体扩散电极（GDE）的电化学方法高效地生产过氧化氢（HO），对于降解饮用水和工业废水中存在的有机污染物具有很大的需求。与其他碳质阴极相比，GDE 作为阴极电催化剂在 HO 生产中具有更高的性价比、更低的能耗和更高的氧气利用率，这是由于其具有有价值的化学和物理特性。近年来，GDE 在降解有机污染物方面的关键研究和实际应用得到了很好的发展。在这篇综述中，我们重点介绍了 GDE 的新型设计、基本方面、影响因素和电化学特性。此外，我们还研究了通过电催化过程产生 HO 以及 GDE 上难处理有机污染物的降解机制。我们描述了电化学动力学的先进方法，包括增强 GDE 电化学催化活性和传质过程。更重要的是，我们还强调了其他技术辅助电化学过程与 GDE 一起扩大水处理的实际应用。此外，还预测了基于 GDE 的电催化材料在 HO 生产和废水处理中的实际应用的发展前景和存在的研究挑战。据我们所知，只有少数几篇综述文章详细讨论了 GDE 在 HO 生产及其在水中有机污染物降解方面的应用。
