Pseudocapacitive desalination via valence engineering with spindle-like manganese oxide/carbon composites

作     者：Yingsheng Xu Shuhong Xiang Hengjian Mao Hongjian Zhou Guozhong Wang Haimin Zhang Huijun Zhao Yingsheng Xu;Shuhong Xiang;Hengjian Mao;Hongjian Zhou;Guozhong Wang;Haimin Zhang;Huijun Zhao

作者机构：Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei230026China Key Laboratory of Materials PhysicsCentre for Environmental and Energy NanomaterialsAnhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei230031China Centre for Clean Environment and EnergyGriffith UniversityGold Coast CampusQLD4222AustraliaSouthport 

基　　金：This work was financially supported by the National Key R&D Program of China(No.2017YFA0207202) the National Natural Science Foundation of China(Nos.51872291 and 51872292) 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2021年第14卷第12期

页      码：4878-4884页

摘      要：Manganese tetravalent oxide(MnO_(2)),a superstar Faradic electrode material,has been investigated extensively for capacitive desalination,enabling higher salt adsorption capacity compared to the great majority of carbonous ***,few works paid attention on the relationship between the valences of manganese oxide and their desalination *** the first time,we prepared the spindle-like manganese oxides/carbon composites with divalent(MnO@C),trivalent(Mn_(2)O_(3)@C)and divalent/trivalent(Mn_(3)O_(4)@C)manganese by pyrolysis of manganese carbonate precursor under different condition,*** electrochemical behavior in three-electrode system and electrosorption performance obtained in hybrid membrane capacitive deionization(HMCDI)cells assembled with capacitive carbon electrodes were systematically evaluated,*** salt adsorption capacity(as large as 31.3,22.2,and 18.9 mg·g^(−1))and corresponding average salt adsorption rates(0.83,0.53,and 1.71 mg·g^(−1)min−1)were achieved in 500 mg·L^(−1) NaCl solution for MnO@C,Mn_(2)O_(3)@C,and Mn_(3)O_(4)@C,*** fifteen electrosorption-desorption cycles,ex-situ water contact angle and morphology comparison analysis demonstrated the superior cycling durability of the manganese oxide electrodes and subtle difference between their surface ***,density functional theory(DFT)was also conducted to elaborate the disparity among the valence states of manganese(+2,+3 and +2/+3)for in-depth *** work introduced manganese oxide with various valences to blaze new trails for developing novel Faradic electrode materials with high-efficiency desalination performance by valence engineering.

主 题 词：capacitive deionization manganese oxides Faradic electrode desalination valence engineering 

学科分类：081704[081704] 07[理学] 070304[070304] 08[工学] 0817[工学-轻工类] 0703[理学-化学类] 

核心收录：

D　O　I：10.1007/s12274-021-3467-z

馆 藏 号：203103361...