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Common-Ion Effect Triggered Highly Sustained Seawater Electrolysis with Additional NaCl Production

查看全文 作　　者：Pengsong [1]Li;Shiyuan [1]Wang;Imran Ahmed [1]Samo;Xingheng [1]Zhang;Zhaolei [1]Wang;Cheng [2]Wang;Yang [1]Li;Yiyun [3]Du;Yang [1]Zhong;Congtian [1]Cheng;Wenwen [4]Xu;Xijun [5]Liu;Yun [1]Kuang;Zhiyi [4,6]Lu;Xiaoming [1]Sun 高影响力作者 机构地区：[1]State Key Laboratory of Chemical Resource Engineering,Beijing Advanced Innovation Centre for Soft Matter Science and Engineering,College of Chemistry,Beijing University of Chemical Technology,Beijing 100029,China;[2]Chinese Research Academy of Environmental Sciences Institution,Beijing 100012,China;[3]State Nuclear Electric Power Planning Design&Research Institute Co.,Ltd.,Beijing,China;[4]Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo,315201 Zhejiang,China;[5]Center for Electron Microscopy and Tianjin Key Lab of Advanced Functional Porous Materials,Institute for New Energy Materials&Low-Carbon Technologies,School of Materials and Engineering,Tianjin University of Technology,Tianjin 300384,China;[6]University of Chinese Academy of Sciences,Beijing 100049,China高影响力机构 出　　处：《Research》索引2020年第1期,共9页高影响力期刊 基　　金：We acknowledge helpful discussion with Prof.Hongjie Dai.This work was supported by the National Natural Science Foundation of China(NSFC);the National Key Research and Development Project(Nos.2018YFB1502401 and 2018YFA0702002);the Royal Society and the Newton Fund through the Newton Advanced Fellowship award(NAF\R1\191294);the Program for Changjiang Scholars and Innovation Research Team in the University(No.IRT1205);the China Postdoctoral Science Foundation(No.BX20200336);the Fundamental Research Funds for the Central Universities;the long-term subsidy mechanism from the Ministry of Finance and the Ministry of Education of PRC. 摘　　要：Developing efficient seawater-electrolysis system for mass production of hydrogen is highly desirable due to the abundance of seawater.However,continuous electrolysis with seawater feeding boosts the concentration of sodium chloride in the electrolyzer,leading to severe electrode corrosion and chlorine evolution.Herein,the common-ion effect was utilized into the electrolyzer to depress the solubility of NaCl.Specifically,utilization of 6M NaOH halved the solubility of NaCl in the electrolyte,affording efficient,durable,and sustained seawater electrolysis in NaCl-saturated electrolytes with triple production of H_(2),O_(2),and crystalline NaCl.Ternary NiCoFe phosphide was employed as a bifunctional anode and cathode in simulative and Ca/Mg-free seawater-electrolysis systems,which could stably work under 500 mA/cm^(2) for over 100 h.We attribute the high stability to the increased Na^(+)concentration,which reduces the concentration of dissolved Cl-in the electrolyte according to the common-ion effect,resulting in crystallization of NaCl,eliminated anode corrosion,and chlorine oxidation during continuous supplementation of Ca/Mg-free seawater to the electrolysis system. 关 键 词：CORROSION CHLORINE ELECTROLYTE
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