氧气浓度需要根据场景的不同进行调控，低氧环境则要对氧气含量进行控制，通常利用电化学方法除氧，高效安全的同时，也无其余副产物的出现。然而传统电化学控氧技术以氧还原反应为核心，除氧装置是以气体扩散电极与液体电解质为主要组成部分，电极会随着运行时长的增加而发热，并且液体电解质对于装置的密封性要求极高，稍有不慎则会出现漏液等问题，为解决这一问题，本课题通过优选制备催化剂，调整气体扩散电极各结构层的组成配方等手段，获得了更具循环稳定性的控氧装置电极组件；通过合成并应用以凝胶聚合物电解质为代表的固态电解质替代电解液；探索制备了高效半固态/全固态电化学控氧装置，有效提升了传统电化学控氧装置的安全性与环保性。

以催化性能较好的金属银负载于活性炭上制备Ag/C催化剂，高温烧结后的银原子与碳颗粒共价结合，使得催化剂粒子均匀性好，具有较好的氧还原活性。当粘结剂聚四氟乙烯质量份数为100时，活性炭为30-40份，乙炔黑质量份数为5-25份之间时制备防水透气层，此时膜层纤维化程度最高，并且均匀包覆于活性炭表面。气体扩散电极能够在电流密度为0.2 A/cm²条件下以0.809 V运行。以氢氧化钾作为电解液构建控氧装置，在密封空间内的控氧速率可达到26.77 ml·min^-1。

制备PAA-KOH凝胶聚合物电解质，分别改变凝胶中四种组分含量与浓度探索凝胶最佳配比，结果发现氢氧化剂为4 M，在3 g 丙烯酸中加入0.5 g 交联剂N'N亚甲基双丙烯酰胺，4 wt%的过硫酸钾水溶液为引发剂时，所制备的凝胶各项性能都最佳。聚合物的离子电导率为3.763×10^-2 S·cm^-1。活化能为9.949 kJ·mol^-1，在与气体扩散电极组装为控氧元件后搭建控氧装置，其控氧速率为12.12 ml·min^-1，低于液体电解质。经过26 min在30 L中的箱体内氧浓度可下降1%，并且能够在电流密度为0.08 A/cm²持续运行100 h，电压涨幅仅为95.79%。

Oxygen concentration needs to be regulated according to the scenario, and the low oxygen environment is to control the oxygen content, usually using electrochemical methods for oxygen removal, which is efficient and safe without the appearance of the remaining by-products. However, the conventional electrochemical oxygen control technology is based on the oxygen reduction reaction as the core, and the oxygen removal device is composed of gas diffusion electrode and liquid electrolyte as the main components, the electrode will heat up as the operation time increases, and the liquid electrolyte requires a high sealing of the device, and the slightest mistake will lead to leakage and other problems. In order to solve this problem, the electrode assembly of oxygen control device is made more stable by selecting the catalyst and adjusting the composition of each structural layer of the gas diffusion electrode, etc. By synthesizing and applying the solid electrolyte represented by the gel polymer electrolyte to replace the electrolyte, and exploring the preparation of high-efficiency semi-solid/all-solid electrochemical oxygen control device, the safety and environmental protection of the traditional electrochemical oxygen control device are effectively improved.

Ag/C catalysts were prepared by loading metallic silver with good catalytic performance on activated carbon. The silver atoms were covalently combined with carbon particles after high temperature sintering, resulting in good uniformity of catalyst particles and better oxygen reduction activity. When the binder PTFE is 100 parts by mass, the activated carbon is 30-40 parts by mass, and the acetylene black is 5-25 parts by mass, the waterproof and breathable layer is prepared, and the membrane layer is the most fibrous and evenly coated on the surface of the activated carbon. The gas diffusion electrode was capable of operating at 0.809 V at a current density of 0.2 A·cm^-2. The oxygen control device was constructed using potassium hydroxide as the electrolyte, and the oxygen control rate in the sealed space could reach 26.77 ml·min^-1.

The PAA-KOH gel polymer electrolyte was prepared, and the optimum ratio of the gel was explored by varying the content and concentration of each of the four components in the gel. It was found that the best performance of the prepared gel was obtained when the hydroxide was 4 M, 0.5 g of the cross-linking agent N'N methylenebisacrylamide was added to 3 g of acrylic acid, and 4wt% of aqueous potassium persulfate was used as the initiator. The ionic conductivity of the polymer was 3.763×10^-2 S·cm^-1. The activation energy was 9.949 kJ·mol^-1, and the oxygen control rate was 12.12 ml·min^-1, which was lower than that of the liquid electrolyte, after assembling with the gas diffusion electrode as an oxygen control element to build an oxygen control device. After 26 min in 30 L in the chamber oxygen concentration can be reduced by 1%, and can be operated continuously at a current density of 0.08 A·cm^-2 for 100 h with a voltage rise of only 95.79%.

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