Pseudocapacitive desalination via valence engineering with spindle-like manganese oxide/carbon composites
Xu, Yingsheng1,2; Xiang, Shuhong1,2; Mao, Hengjian1,2; Zhou, Hongjian2; Wang, Guozhong2; Zhang, Haimin2; Zhao, Huijun2,3
Source PublicationNANO RESEARCH
Corresponding AuthorZhou, Hongjian(hjzhou@issp.ac.cn) ; Zhang, Haimin(zhanghm@issp.ac.cn)
AbstractManganese tetravalent oxide (MnO2), a superstar Faradic electrode material, has been investigated extensively for capacitive desalination, enabling higher salt adsorption capacity compared to the great majority of carbonous electrodes. However, few works paid attention on the relationship between the valences of manganese oxide and their desalination performance. For the first time, we prepared the spindle-like manganese oxides/carbon composites with divalent (MnO@C), trivalent (Mn2O3@C) and divalent/ trivalent (Mn3O4@C) manganese by pyrolysis of manganese carbonate precursor under different condition, respectively. The 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, respectively. High 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, Mn2O3@C, and Mn3O4@C, respectively. During 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 redox. Furthermore, 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 understanding. This 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.
Keywordcapacitive deionization manganese oxides Faradic electrode desalination valence engineering
Indexed BySCI
Funding ProjectNational Key R&D Program of China[2017YFA0207202] ; National Natural Science Foundation of China[51872291] ; National Natural Science Foundation of China[51872292]
Funding OrganizationNational Key R&D Program of China ; National Natural Science Foundation of China
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
WOS SubjectChemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
WOS IDWOS:000652107900001
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Document Type期刊论文
Corresponding AuthorZhou, Hongjian; Zhang, Haimin
Affiliation1.Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Anhui Key Lab Nanomat & Nanotechnol, Ctr Environm & Energy Nanomat,Inst Solid State Ph, Key Lab Mat Phys,CAS Ctr Excellence Nanosci,HFIPS, Hefei 230031, Peoples R China
3.Griffith Univ, Ctr Clean Environm & Energy, Gold Coast Campus, Gold Coast, Qld 4222, Australia
Recommended Citation
GB/T 7714
Xu, Yingsheng,Xiang, Shuhong,Mao, Hengjian,et al. Pseudocapacitive desalination via valence engineering with spindle-like manganese oxide/carbon composites[J]. NANO RESEARCH,2021.
APA Xu, Yingsheng.,Xiang, Shuhong.,Mao, Hengjian.,Zhou, Hongjian.,Wang, Guozhong.,...&Zhao, Huijun.(2021).Pseudocapacitive desalination via valence engineering with spindle-like manganese oxide/carbon composites.NANO RESEARCH.
MLA Xu, Yingsheng,et al."Pseudocapacitive desalination via valence engineering with spindle-like manganese oxide/carbon composites".NANO RESEARCH (2021).
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