ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Jie Jin,Man Li,Mengting Tang,Yang Li,Yangyang Liu,Hui Cao,Feihu Li
Hybrid capacitive deionization (HCDI) is an emerging and promising technology for water desalination and has been extensively explored in recent years. Designing a structure-tailorable electrode material has been proved to be a valid strategy for achieving a higher salt adsorption capacity (SAC). In this study, MnO2 materials with tailorable phase compositions and crystallinities were prepared hydrothermally and then evaluated as electrodes for removal of ions from a NaCl solution in a membrane-free HCDI cell. MnO2 electrode materials tested in the HCDI system include poorly crystalline δ-MnO2 along with abundant amorphous phases (MnO2-1h); crystalline δ-MnO2 with plentiful amorphous MnO2 (MnO2-2h); MnO2 mixtures of α-, δ-, and amorphous MnO2 (MnO2-5h); and α-MnO2 nanowires with minor amorphous MnO2 (MnO2-12h). Our results revealed that the phase composition and the crystallinity of MnO2 materials govern their specific capacitances and thus the SAC values. When the cell voltage is 1.2 V, the lamellar-structured poorly crystalline MnO2-1h electrode with the lowest crystallinity demonstrates the highest SACs of 13.84 mg g–1 in 100 mg L–1 NaCl (1.71 mM) and 21.32 mg g–1 in 500 mg L–1 NaCl (8.56 mM) solutions, respectively. The desalination efficiencies of the MnO2−1h electrode are remarkable and much greater than other MnO2-based electrodes under similar conditions (e.g., NaCl concentrations, cell voltage, etc.). This study sheds light on the significance of understanding the fundamentals of both the phase composition and crystallinity in defining the desalination performance of MnO2 electrodes.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Pengcheng Yin,Yucheng Yang,Shu Zhang,Zhao Hu,Dawei Li,Feihu Li
The potential of capacitive deionization (CDI) for sustainable desalination depends critically on breakthroughs in electrode materials. Defect-rich titanium (sub) oxides (anatase TiO₂(A), Ti₂O₃, Ti₃O₅, Ti₄O₇) offer compelling advantages, including tunable capacity, low environmental impact, and robustness. This study provides a systematic comparison of their structural features, electrochemical responses, and desalination efficacy. Electrochemical characterization results show anatase TiO₂(A) leads in specific capacitance (252.5 F g −1 at 0.3 A g −1 ), while Ti₃O₅’s highest oxygen vacancy minimizes charge transfer resistance and maximizes ion migration rates. In desalination trials, TiO₂ delivers a maximum salt adsorption capacity of 37.1 mg g −1 (500 mg L −1 NaCl, 1.2 V). All electrodes exhibit outstanding cycling stability (capacity retentions >83.5 %), affirming their practical potential. Correlation analysis discloses the oxygen vacancy-driven charge transfer mechanism inside these electrodes and establishes a structure-performance relationship. Overall, this work establishes fundamental structure-property relationships that underpin future electrode innovation via the oxygen vacancy-engineering strategy, which represents a promising pathway for advancing CDI performance boundaries.
研究领域:
材料科学
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环境工程
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电化学
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水脱盐
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能量存储
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DOI
高影响因子
DESALINATION
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2023
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IF 9.9
Xueying Gao,Zhenzhen Fu,Yanfei Sun,Dewei Wang,Xiaoxuan Wang,Zishan Hou,Jinrui Wang,Xia Liu,Shiyu Wang,Shuyun Yao,Huiying Zhang,Shuyuan Li,Zheng Tang,Weijie Fu,Kaiqi Nie,Jiangzhou Xie,Zhiyu Yang,Yi-Ming Yan
While MnO 2 has been identified as a potent agent in the desalination process , its efficacy is significantly impeded by its inherent poor electrical conductivity and substantial ion diffusion barriers . By orchestrating an interfacial electron bridge within the MnO 2 /g-C 3 N 4 heterostructure , reinforced through N p z -Mn d z 2 orbital hybridization, we have managed to significantly boost both SAC and SAR in the HCDI process. The reinforced N p z -Mn d z 2 orbital hybridization triggers a substantial electron transition from g-C 3 N 4 to MnO 2 , culminating in a high Mn d z 2 electron occupancy. Further analysis reveals the formation of a Mn N chemical bond at the MnO 2 /g-C 3 N 4 interface, operating as an essential electron transfer bridge from g-C 3 N 4 to MnO 2 . This process concurrently initiates a rise in the Mn d z 2 orbital energy level, equipping the Mn d z 2 electron with superior redox activity. With these enhancements, the manufactured MnO 2 /g-C 3 N 4 exhibits exemplary performance, boasting an improved SAC of 68 mg g −1 and SAR of 3.6 mg g −1 min −1 with a decreased energy consumption of 0.7224 kWh kg −1 at 1.2 V. This innovative work offers an unconventional roadmap for activating electron redox activity and thereby accelerating charge transfer in transition metal oxides .
研究领域:
材料科学
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环境科学
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电化学
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水处理
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DOI
高影响因子
DESALINATION
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2024
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IF 8.3
Guiying Tian,Jian Gao,Shuxiao Yan,Hui Wang,Ruilin Li,Jun Xiang,Wei Du,Lei Zhang,Na Tang
with the unprecedented demand for raw lithium, the spinel LiMn 2 O 4 has been widely studied for electrochemical Li-recovery from salt-lake brines, but its industrialization is hindered by the poor cyclability induced by manganese dissolution and Jahn-Teller distortion within octahedral structure. In this work, Cr-doped and carbon-coated LiMn 2 O 4 (C-LMO-Cr) electrodes prepared via coprecipitation-calcination method are employed to improve cycling stability and lithium selectivity for electrochemical Li-recovery. The results confirm the C-LMO-Cr electrode exhibits super-high retention rate of 98.76 % and 95.70 % of the initial capacity (27 mg·g −1 ) after 300 and 500 cycles, respectively. The carbon buffering on the C-LMO-Cr surface effectively impedes the initial manganese dissolution with the enhanced charge transfer. Moreover, the structural evolution from Raman/XPS analysis and theoretical calculations confirms that the shrinking lattice of the carbon-buffering LMO-Cr enhances Li + selectivity and Li + migration. When assembled in a hybrid capacitive deionization (HCDI) device, the optimal C-LMO-Cr electrode displays high adsorption capacity of ∼21 mg·g −1 , moderate energy consumption of 13 Wh·mol −1 (Li + ) with a remarkable increase in Mg/Li ratio from 1.67 to 158 in the original brine from Jiezechaka. Therefore, these results demonstrate a promising potential of C-LMO-Cr electrodes for long-acting electrochemical lithium-recovery from original brines.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
高影响因子
DESALINATION
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2025
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IF 9.8
Peipei Zhang,Haibing Zhang,Sufen Cui,Zhimin Jiang,Jun Yang,Minjie Shi
The emergence of hybrid capacitive deionization (HCDI), utilizing faradaic electrodes with pseudocapacitive properties, offers a promising electrochemical solution for water desalination and purification. Despite the increasing interest in organic materials for faradaic electrodes, their widespread use in HCDI devices is still hindered by obstacles about insufficient redox-active sites and low stability in aqueous environments. To address these challenges, we introduce a novel dual-functional redox-active polymer, named PZPS, which features a rigid conjugated backbone with dual-redox centers (C N and S O bonds). This unique molecular design, along with extensive π-electron delocalization across the strong polymeric structure, significantly improves pseudocapacitive Na + coordination and ensures remarkable stability in aqueous solution. As an electrode, the PZPS polymer exhibits an impressive specific capacitance and excellent cyclability, maintaining 98.04 % of its initial capacitance after 10,000 cycles. Consequently, a high-performance HCDI device with the PZPS electrode demonstrates impressive electrochemical desalination capabilities. It achieves a substantial salt removal capacity of 58.82 mg g −1 at 1.2 V, a rapid average removal rate of 1.96 mg g −1 min −1 , and remarkable regeneration stability (∼93.15 % after 50 cycles). These results highlight the electrochemical advantages of the PZPS-based HCDI device and underscore its significant potential for highly efficient desalination applications.
研究领域:
电化学
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环境工程
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材料科学
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水净化技术
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能量存储与转换
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DOI
高影响因子
危险品化学品经营许可证（带存储）