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Electrosynthesis of >20 g/L H2O2 from Air
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-12-14 , DOI: 10.1021/acsestengg.1c00366
Huihui Li 1, 2 , Estefanny Quispe-Cardenas 2 , Shasha Yang 2 , Lifeng Yin 1 , Yang Yang 2
Affiliation  

Hydrogen peroxide (HP) production via electrochemical oxygen reduction reaction (ORR-HP) is a critical reaction for energy storage and environmental remediation. The onsite production of high-concentration H2O2 using gas diffusion electrodes (GDEs) fed by air is especially attractive. However, many studies indicate that the air–GDE combination could not produce concentrated H2O2, as the [H2O2] leveled off or even decreased with the increasing reaction time. This study proves that the limiting factors are not the oxygen concentration in the air but the anodic and cathodic depletion of the as-formed H2O2. We proved that the anodic depletion could be excluded by adopting a divided electrolytic cell. Furthermore, we demonstrated that applying poly(tetrafluoroethylene) (PTFE) as an overcoating rather than a catalyst binder could effectively mitigate the cathodic decomposition pathways. Beyond that, we further developed a composite electrospun PTFE (E-PTFE)/carbon black (CB)/GDE electrode featuring the electrospun PTFE (E-PTFE) nanofibrous overcoating. The E-PTFE coating provides abundant triphase active sites and excludes the cathodic depletion reaction, enabling the production of >20 g/L H2O2 at a current efficiency of 86.6%. Finally, we demonstrated the efficacy of the ORR-HP device in lake water remediation. Cyanobacteria and microcystin-LR were readily removed along with the onsite production of H2O2.

中文翻译:

从空气中电合成 >20 g/L H2O2

通过电化学氧还原反应 (ORR-HP) 生产过氧化氢 (HP) 是储能和环境修复的关键反应。使用由空气供给的气体扩散电极 (GDE)现场生产高浓度 H 2 O 2尤其具有吸引力。然而,许多研究表明,空气-GDE 组合不能产生浓缩的 H 2 O 2,​​因为 [H 2 O 2 ] 随着反应时间的增加趋于平稳甚至下降。这项研究证明,限制因素不是空气中的氧气浓度,而是形成的 H 2 O 2的阳极和阴极消耗。. 我们证明了通过采用分隔式电解池可以排除阳极耗尽。此外,我们证明了使用聚(四氟乙烯)(PTFE)作为外涂层而不是催化剂粘合剂可以有效地缓解阴极分解途径。除此之外,我们还开发了一种复合电纺 PTFE (E-PTFE)/炭黑 (CB)/GDE 电极,具有电纺 PTFE (E-PTFE) 纳米纤维外涂层。E-PTFE 涂层提供了丰富的三相活性位点并排除了阴极耗尽反应,从而能够生产 >20 g/LH 2 O 2电流效率为 86.6%。最后,我们展示了 ORR-HP 装置在湖水修复中的功效。随着 H 2 O 2的现场生产,蓝藻和微囊藻毒素-LR 很容易被去除。
更新日期:2022-02-11
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