Chemosphere ( IF 5.778 ) Pub Date : 2021-02-22 , DOI: 10.1016/j.chemosphere.2021.130060 Xiangdong Tan; Chengyu Jin; Wenjing Sun; Ying Zhao; Huangzhao Wei; Chenglin Sun
Significant efforts have been made to achieve efficient H2O2 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 H2O2 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 H2O2 generation experiments of GDEs and the relationship between H2O2 yield and BET surface area (SBET), double layer capacitance (Cdl) were all investigated. It could be found that the SBET and Cdl of GDEs kept a good linear relationship with H2O2 content, and 2#GDE (AB:PTFE = 1:3) possessed the optimal H2O2 generation capacity. Also, the effect of oxygen pressure and current density on H2O2 production was evaluated detailedly, indicating higher oxygen pressure was beneficial to the H2O2 generation and the preferable current density was 20 mA cm−2 due to the side reactions. And all the H2O2 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 PbO2 anode and GDE.
为了通过氧还原反应（ORR）产生有效的H 2 O 2，已经做出了巨大的努力。在此，制造了由PTFE改性的乙炔黑（AB）基气体扩散电极（GDE），并首次将其应用于密闭高压釜中，以产生H 2 O 2。表征了GDE的表面形态，BET，XPS，循环伏安曲线和线性扫描伏安曲线。此外，GDE的H 2 O 2生成实验以及H 2 O 2产率与BET表面积（S BET），双层电容（C dl）之间的关系）进行了调查。可以发现，GDEs的S BET和C dl与H 2 O 2含量保持良好的线性关系，而2＃GDE（AB：PTFE = 1：3）具有最佳的H 2 O 2产生能力。另外，详细评估了氧气压力和电流密度对H 2 O 2产生的影响，表明较高的氧气压力有利于H 2 O 2的产生，并且由于副反应，优选的电流密度为20mA cm -2。还有所有的H 2 O 2发电实验显示出更高的氧气利用率（0.77％–2.93％）。最后，通过自制的PbO 2阳极和GDE实现了异佛尔酮的高效协同电催化降解。