Dopant-designed conducting polymers for constructing a high-performance, electrochemical deionization system achieving low energy consumption and long cycle life

Huang, Hung-Yi; Tu, Yi-Heng; Yang, Yu-Hsiang; Lu, Yi-Ting; Hu, Chi‐Chang

doi:10.1016/j.cej.2023.141373

Cited by 12 publications

(7 citation statements)

References 69 publications

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“…Compared with other high-stability ECDI systems reported in the literature, 6,15,16,19,37,41–45 Fig. 8c and Table S4† showed that our PPy-DBS-1//PPy-ClO 4 system achieved the highest SAC performance with an acceptable cycle life.…”

Section: Resultsmentioning

confidence: 74%

“…In a previous study, 19 we found that the dopant size influenced the anion- or cation-exchange ability of PPy. Accordingly, LiClO 4 was chosen as the negative-electrode dopant salt for the PPy-ClO 4 electrode.…”

Section: Experimental and Methodsmentioning

confidence: 78%

“…According to our previous work, fine-tuning the mass loading of PPy-based electrodes demonstrated the potential to augment the desalination capacity of ECDI systems. 19 Fig. S12† and 5d illustrate the SAC and EC values across three PPy-based ECDI systems with regard to alterations in the mass loading of active materials.…”

Section: Resultsmentioning

confidence: 99%

“…It was observed that large dopants, such as 4-methylbenzene-sulfonic acid (p-TS), were effective in cation-capturing, whereas small dopants such as perchlorate (ClO 4 ) could move freely to facilitate the anion-exchange capability of the PPy-ClO 4 electrode. 19 That study laid the groundwork for a follow-up study of the interaction between PPy and doped ions in ECDI systems.…”

Section: Introductionmentioning

confidence: 99%

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Probing host–dopant interactions in conducting polymers for improved performance of electrochemical deionization

Huang,

Tu,

Yang

et al. 2024

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 74%

Section: Experimental and Methodsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Probing host–dopant interactions in conducting polymers for improved performance of electrochemical deionization

Huang,

Tu,

Yang

et al. 2024

J. Mater. Chem. A

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“…Unlike the use of electrostatic forces to form an electric double layer on electrodes, these materials rely on electron transfer between the electroactive materials and electrolytes as the driving force. Through this mechanism, ions can be effectively removed utilizing various mechanisms such as ion intercalation/insertion, − compound formation, , and charge compensation. , The success achieved by Faradaic materials has spurred the development of numerous types, including metal oxides, ,− conductive polymers, − Prussian blue analogues (PBAs), , organo-metallic compounds, metal–organic frameworks (MOFs), , and other derivatives or hybrid materials. By harnessing these Faradaic materials, the desalination performance of an ECDI system can be significantly enhanced, thereby advancing its prospects for commercialization.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study on the Ion-Selective Behavior of MnO_x for Electrochemical Deionization

Tu,

Huang,

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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Manganese oxide is an effective active material in several electrochemical systems, including batteries, supercapacitors, and electrochemical deionization (ECDI). This work conducts a comprehensive study on the ion-selective behavior of MnO x to fulfill the emptiness in the energy and environmental science field. Furthermore, it broadens the promising application of MnO x in the ion-selective ECDI system. We propose a time-dependent multimechanism ion-selective behavior with the following guidelines by utilizing a microfluidic cell and the electrochemical quartz crystal microbalance (EQCM) analysis. (1) Hydrated radius is the most critical factor for ions with the same valence, and MnO x tends to capture cations with a small hydrated radius. (2) The importance of charge density rises when comparing cations with different valences, and MnO x prefers to capture divalent cations with a strong electrostatic attraction at prolonged times. Under this circumstance, ion swapping may occur where divalent cations replace monovalent cations. (3) NH 4 + triggers MnO x dissolution, leading to performance and stability decay. The EQCM evidence has directly verified the proposed mechanisms, and these data provide a novel but simple method to judge ion selectivity preference. The overall ion selectivity sequence is Ca 2+ > Mg 2+ > K + > NH 4 + > Na + > Li + with the highest selectivity values of β Ca//Li and β Ca//Na around 3 at the deionization time = 10 min.

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Kinetic-Thermodynamic Promotion Engineering toward High-Density Hierarchical and Zn-Doping Activity-Enhancing ZnNiO@CF for High-Capacity Desalination

Ma,

Xing,

Wang

et al. 2024

Nano-Micro Lett.

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Despite the promising potential of transition metal oxides (TMOs) as capacitive deionization (CDI) electrodes, the actual capacity of TMOs electrodes for sodium storage is significantly lower than the theoretical capacity, posing a major obstacle. Herein, we prepared the kinetically favorable ZnxNi1 − xO electrode in situ growth on carbon felt (ZnxNi1 − xO@CF) through constraining the rate of OH− generation in the hydrothermal method. ZnxNi1 − xO@CF exhibited a high-density hierarchical nanosheet structure with three-dimensional open pores, benefitting the ion transport/electron transfer. And tuning the moderate amount of redox-inert Zn-doping can enhance surface electroactive sites, actual activity of redox-active Ni species, and lower adsorption energy, promoting the adsorption kinetic and thermodynamic of the Zn0.2Ni0.8O@CF. Benefitting from the kinetic-thermodynamic facilitation mechanism, Zn0.2Ni0.8O@CF achieved ultrahigh desalination capacity (128.9 mgNaCl g−1), ultra-low energy consumption (0.164 kW h kgNaCl−1), high salt removal rate (1.21 mgNaCl g−1 min−1), and good cyclability. The thermodynamic facilitation and Na+ intercalation mechanism of Zn0.2Ni0.8O@CF are identified by the density functional theory calculations and electrochemical quartz crystal microbalance with dissipation monitoring, respectively. This research provides new insights into controlling electrochemically favorable morphology and demonstrates that Zn-doping, which is redox-inert, is essential for enhancing the electrochemical performance of CDI electrodes.

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Dopant-designed conducting polymers for constructing a high-performance, electrochemical deionization system achieving low energy consumption and long cycle life

Cited by 12 publications

References 69 publications

Probing host–dopant interactions in conducting polymers for improved performance of electrochemical deionization

Probing host–dopant interactions in conducting polymers for improved performance of electrochemical deionization

Comprehensive Study on the Ion-Selective Behavior of MnO_x for Electrochemical Deionization

Kinetic-Thermodynamic Promotion Engineering toward High-Density Hierarchical and Zn-Doping Activity-Enhancing ZnNiO@CF for High-Capacity Desalination

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Dopant-designed conducting polymers for constructing a high-performance, electrochemical deionization system achieving low energy consumption and long cycle life

Cited by 12 publications

References 69 publications

Probing host–dopant interactions in conducting polymers for improved performance of electrochemical deionization

Probing host–dopant interactions in conducting polymers for improved performance of electrochemical deionization

Comprehensive Study on the Ion-Selective Behavior of MnOx for Electrochemical Deionization

Kinetic-Thermodynamic Promotion Engineering toward High-Density Hierarchical and Zn-Doping Activity-Enhancing ZnNiO@CF for High-Capacity Desalination

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Comprehensive Study on the Ion-Selective Behavior of MnO_x for Electrochemical Deionization