碳纤维纸负载CuSnBi复合电极催化材料的制备及其CO_(2)与水共电解制氧性能

Preparation of Carbon Fiber Paper Supported CuSnBi Composite Electrode Catalytic Material and Its Performance for Oxygen Generation by Co-electrolysis of CO_(2)and H_(2)O

氧气供应和CO_(2)消除对于密闭空间内工作人员的生命安全与工作效能至关重要。虽然在电力供应充足的情况下电解水制氧技术优势明显,但反应生成的氢气存在安全隐患。本研究探讨了一种CO_(2)与水共电解制氧模式。该模式通过阴极将CO_(2)还原为甲酸,通过阳极生成纯氧,同时实现了CO_(2)的消除和氧气供应,并有效抑制了析氢反应发生。采用电沉积法在碳纤维纸上制备了CuSnBi催化材料作为共电解体系的阴极,甲酸的法拉第效率高达97.6%,电流密度高达41.5 mA·cm^(−2)。同时,单位面积电极产氧速率为2 mL·min^(−1)·cm^(−2)。据此可推算,20 cm×10 cm电极的产氧速率可达24 L·h^(−1)。与水电解制氧技术相比,CO_(2)与水共电解制氧优势明显,是一种极具应用潜力的密闭空间制氧技术。

Oxygen supply and carbon dioxide removal are crucial for the life safety and work efficiency of staff in confined spaces.Although the technology of oxygen generation by electrolysis of water has obvious advantages under the condition of sufficient power supply,the hydrogen gas generated by the reaction has hidden dangers.A co-electrolytic oxygen production model of CO_(2)and H_(2)O was studied.In this model,CO^(2)was reduced to formic acid by the cathode and pure oxygen was generated by the anode.Both CO^(2)elimination and oxygen supply were realized in this model,and hydrogen evolution reaction was effectively inhibited.CuSnBi material was prepared as the cathode of the co-electrolysis system by electrodeposition on carbon paper.The maximum Faraday efficiency was 97.6%and the maximum partial current density was 41.5 mA·cm^(−2).The oxygen production rate was 2 mL·min^(−1)·cm^(−2).It can be concluded that the oxygen production rate of 20 cm×10 cm is up to 24 L·h^(−1).Compared with the water electrolysis technology,co-electrolysis of CO^(2)and H_(2)O has obvious advantages in oxygen production,which is a promising oxygen generation technology in confined spaces.