Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, PR China.
Chemosphere. 2021 Jul;275:130060. doi: 10.1016/j.chemosphere.2021.130060. Epub 2021 Feb 22.
Significant efforts have been made to achieve efficient HO generation via oxygen reduction reaction (ORR). Here, the acetylene black (AB)-based gas diffusion electrodes (GDEs) modified by PTFE were fabricated and applied in a closed autoclave for HO generation for the first time. The surface morphology, BET, XPS, cyclic voltammetry curves and linear scanning voltammetry curves of GDEs were all characterized. Additionally, the HO generation experiments of GDEs and the relationship between HO yield and BET surface area (S), double layer capacitance (C) were all investigated. It could be found that the S and C of GDEs kept a good linear relationship with HO content, and 2#GDE (AB:PTFE = 1:3) possessed the optimal HO generation capacity. Also, the effect of oxygen pressure and current density on HO production was evaluated detailedly, indicating higher oxygen pressure was beneficial to the HO generation and the preferable current density was 20 mA cm due to the side reactions. And all the HO electro-generation experiments exhibited a higher oxygen utilization efficiency (0.77%-2.93%). Finally, the efficient and synergetic electro-catalytic degradation of isophorone was achieved by self-made PbO anode and GDE.
已经做出了巨大努力，通过氧还原反应（ORR）来实现高效的 HO 生成。在这里，首次制备了基于乙炔黑（AB）的聚四氟乙烯（PTFE）改性气体扩散电极（GDE），并将其应用于封闭高压釜中进行 HO 生成。对 GDE 的表面形貌、BET、XPS、循环伏安曲线和线性扫描伏安曲线进行了表征。此外，还研究了 GDE 的 HO 生成实验以及 HO 产率与 BET 表面积（S）、双层电容（C）之间的关系。结果表明，GDE 的 S 和 C 与 HO 含量保持良好的线性关系，2#GDE（AB：PTFE=1：3）具有最佳的 HO 生成能力。还详细评估了氧气压力和电流密度对 HO 生成的影响，结果表明较高的氧气压力有利于 HO 的生成，而由于副反应，优选的电流密度为 20 mA cm。所有的 HO 电化学生成实验均表现出较高的氧气利用率（0.77%-2.93%）。最后，通过自制的 PbO 阳极和 GDE 实现了异佛尔酮的高效协同电催化降解。
