A Membrane-Free and Energy-Efficient Three-Step Chlor-Alkali Electrolysis with Higher-Purity NaOH Production

被引：20
作者：
Zhao, Along [1 ]
Zhong, Faping [2 ]
Feng, Xiangming [3 ]
Chen, Weihua [3 ]
Ai, Xinping [1 ]
Yang, Harai [1 ]
Cao, Yuliang [1 ]
机构：
[1] Wuhan Univ, Hubei Key Lab Electrochem Power Sources, Coll Chem & Mol Sci, Wuhan 430072, Hubei, Peoples R China
[2] Natl Engn Res Ctr Adv Energy Storage Mat, Changsha 410205, Hunan, Peoples R China
[3] Zhengzhou Univ, Coll Chem & Mol Engn, Zhengzhou 450001, Henan, Peoples R China
来源：
ACS APPLIED MATERIALS & INTERFACES | 2019年 / 11卷 / 48期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
chlor-alkali electrolysis; membrane-free; three-step electrolysis; oxygen reducing cathode; energy efficiency; OXYGEN DEPOLARIZED CATHODES; LITHIUM RECOVERY; SODIUM; NA0.44MNO2; HISTORY; LIFE; POLYANILINE; BATTERIES; CATALYST; CELL;
D O I：
10.1021/acsami.9b16754
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Conventional chlor-alkali processes are energy-consuming and environmentally unfriendly. To deal with this problem, we developed a three-step electrolysis (TSE) for a cleaner, energy-saving, and lower-cost chlor-alkali process. This new chlor-alkali process consists of three independent steps: a NaOH-production step in a Na0.44MnO2/oxygendepolarizing cathode cell (step I), a Na+ and CI- extraction step in a Ag/Na0.44-xMnO2 cell (step II), and a CI2-production step in a graphite/AgCl cell (step III). This technology avoids the use of expensive ion-exchange membrane and toxic electrode materials, providing a great prospect to create a cleaner, energy-saving, and lower-cost chlor-alkali electrolysis process. This electrochemical ion coupling/decoupling technology can also be extended to other salt solutions (Na2SO4/NaNO3) to produce corresponding alkali (NaOH) and acid (H2SO4/HNO3), which has potential significance in the chlor-alkali industry.
引用
收藏
页码：45126 / 45132
页数：7
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