电解铝CO_(2)资源化利用的隔膜电解池的设计  

Design of membrane electrolysis cell for CO_(2) electro-reduction utilized in electrolytic aluminum industry

作　　者：宋文康 沈风霞[1] 吴帅 华雅鑫 张金忠 施锦[1] SONG Wenkang;SHEN Fengxia;WU Shuai;HUA Yaxin;ZHANG Jinzhong;SHI Jin(College of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《化学研究》2024年第2期140-146,共7页Chemical Research

基　　金：国家自然科学基金资助项目(52164048)。

摘　　要：将工业废气中的CO_(2)转化为高值化学品,创造经济效益,是CO_(2)高排放行业迫切需要解决的重大现实问题。然而,由于缺乏工业适用的电化学反应装置,研究工作一直未取得实质性突破。针对上述问题,提出了一种新型隔膜电解池,可以在阴极上将CO_(2)电还原为CO,在阳极上将HCl氧化成Cl_2,所得CO、Cl_2用于合成光气。通过这种方法,不仅可以实现CO_(2)减排,还可以解决含HCl工业废气综合利用问题。为了提高电解CO_(2)制CO的效率,采用无氰电镀法制备了三维流通型Ag/Cu多孔修饰电极,通过提高电极比表面积,增加活性位点,将阴极电流密度提高至46.3 mA/cm^(2),生成CO的法拉第效率稳定在92.52%。本项研究在电能储存和CO_(2)减排领域具有重要理论研究价值和工程应用前景。The conversion of CO_(2) to high valuable chemicals using the renewable energy has attracted much attention in chemical industry.However,owing to the lack of efficient technology,no breakthrough has been achieved.In order to solve above problems,a new membrane electrolytic cell was proposed in this work.In the cell,CO_(2) can be reduced to CO at cathode and HCl can be oxidized to Cl_(2) at the anode.The obtained CO and Cl_(2) can be used to synthesize phosgene.In this way,not only can recycling of HCl waste gas be solved,but also CO_(2) emission reduction can be realized.In order to improve the efficiency of CO_(2) electroreduction,three-dimensional flowing Ag/Cu porous modified electrode was fabricated by cyanide-free electroplating method.The current density of the cathode reaction is increased to 46.3 mA/cm^(2) by expanding the specific surface area of the electrode and increasing the active sites on the electrode surface,the Faraday efficiency of CO generation is stable at 92.52%.This work has a high theoretical value and a promising perspective in storage of electric energy and reducing carbon dioxide emission.

关 键 词：隔膜电解池 CO_(2)电还原 含HCl废气循环利用 多孔修饰电极 

分 类 号：O646[理学—物理化学]