ZIF-67 metal-organic frameworks and CNTs-derived nanoporous carbon structures as novel electrodes for flow-electrode capacitive deionization

Phuoc, Ngo Minh; Tran, Nguyen Anh Thu; Khoi, Tran Minh; Jung, Hye Bin; Ahn, Wook; Jung, Euiyeon; Yoo, Chung‐Yul; Kang, Hyeonbae; Cho, Younghyun

doi:10.1016/j.seppur.2021.119466

Cited by 14 publications

(4 citation statements)

References 44 publications

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“…(b) Comparative LSV curves at 25 and 80 °C. (c) Comparative η 10 of similar electrocatalysts. ,− (d) Tafel plots at different temperatures for Ni 4g ZIF electrocatalyst. HER measurements.…”

Section: Resultsmentioning

confidence: 99%

Significant Enhancement of Electrocatalytic Activity of Nickel-Based Amorphous Zeolite Imidazolate Frameworks for Water Splitting at Elevating Temperatures

Iqbal,

Xu,

et al. 2024

ACS Appl. Energy Mater.

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Numerous synthesis strategies have been adopted to promote the electrocatalytic behavior of electrocatalysts for water splitting. Suitable conditions can effectively influence and enhance the electrocatalytic activity. Oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities of the Ni 4g ZIF structure have been characterized at various temperatures. Elevating the temperature removed the energy barriers from the surface of the electrocatalysts. Higher electrical conductivity and increased temperature promoted the adsorption and desorption processes of active atoms on the electrocatalyst surface, which enhanced the electrocatalytic activity of the Ni 4g ZIF structure. The Ni 4g ZIF structure showed an overpotential of 224 mV at 80 °C to approach a current density of 10 mA cm −2 for the OER process. The Ni 4g ZIF structure exhibits a good Tafel slope of 78 mV dec −1 with a turnover frequency of 314.80 ms −1 for the OER process. Similarly, the Ni 4g ZIF structure exhibits an overpotential of 184 mV at 25 °C, which was improved to 82 mV at 80 °C for the HER process. The Ni 4g ZIF structure exhibits a good Tafel slope of 83 mV dec −1 at 80 °C for the HER process. The intralayer spacing of the Ni 4g ZIF structure was increased during stability tests at higher temperatures. UV−visible measurements of supernatant solutions did not show any leaching and colloidal particles after stability tests in 1 M KOH. Results indicate that the Ni 4g ZIF structure exhibits good electrocatalytic behavior at suitable conditions for water splitting.

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Section: Resultsmentioning

confidence: 99%

Significant Enhancement of Electrocatalytic Activity of Nickel-Based Amorphous Zeolite Imidazolate Frameworks for Water Splitting at Elevating Temperatures

Iqbal,

Xu,

et al. 2024

ACS Appl. Energy Mater.

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“…Gloukhovski and Suss investigated multi-walled carbon nanotube flow-electrodes with the KBr additive, confirming that the electrical conductivity of flow-electrodes is proportional to the amount of carbon nanotubes and KBr. Cho et al − reported that the high-aspect-ratio functionalized carbon nanotube, redox-active quinone, metal–organic frameworks/carbon nanotube-derived carbons, and polydopamine-coating can improve the electrochemical properties of the AC-based flow-electrode substantially. Yang et al , reported that the electrochemical properties of AC-based flow-electrodes can be substantially improved by adding NaCl and plate-shaped graphite into the flow-electrode.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Electrochemical Impedance Spectroscopy Study of Flow-Electrode Capacitive Deionization Cells

Kim

Park

Cho

et al. 2023

Environ. Sci. Technol.

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Flow-electrode capacitive deionization (FCDI) offers infinite ion adsorption for continuous desalination of high-concentration saline water by supplying a flow-electrode to the cell. Although extensive efforts have been made to maximize the desalination rate and efficiency of FCDI cells, the electrochemical properties of these cells are not fully understood. This study investigated the factors affecting the electrochemical properties of FCDI cells containing activated carbon (AC; 1–20 wt %) and various flow rates (6–24 mL/min) for the flow-electrode using electrochemical impedance spectroscopy before and after desalination. Examination of the impedance spectra using the distribution of relaxation time and equivalent circuit fitting analysis revealed three distinctive resistances such as internal, charge transfer, and ion adsorption resistances. The overall impedance decreased significantly after the desalination experiment due to increased ion concentrations in the flow-electrode. The three resistances decreased with increasing concentrations of AC in the flow-electrode due to the extension of electrically connected AC particles that participated in the electrochemical desalination reaction. The ion adsorption resistance decreased significantly due to the flow rate dependence of the impedance spectra. In contrast, the internal and charge transfer resistances were invariant.

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“…Thermal treatment such as multistage flash stands out for its high desalination efficiency, but the corrosion of equipment and high energy consumption increase the operation cost. Membrane separation such as reverse osmosis gains popularity due to its lower cost and simplicity, but membrane fouling remains a severe problem. − In recent years, capacitive deionization (CDI) has attracted tremendous attention for its low energy consumption and excellent desalination performance. − However, the operation of CDI relies on the fixed electrodes, which can only provide limited adsorption capacity, and the electrode needs to be regenerated after reaching saturation by applying a reverse voltage. − Thus, continuous operation based on CDI technology seems unrealistic. To address such challenges, flow electrode capacitive deionization (FCDI) was developed in 2013, where flow electrodes were used instead of the fixed ones …”

Section: Introductionmentioning

confidence: 99%

Insights into the Particle Hydrophilicity and Electrical Conductivity for the Construction of a Highly Efficient Electrical Percolation Network in Flow Electrode Capacitive Deionization

Zhu,

Xiong,

Chen

et al. 2023

Ind. Eng. Chem. Res.

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In flow electrode capacitive deionization (FCDI), a stably dispersed slurry with well-developed conductive networks is required to obtain a satisfactory desalination performance. In this work, slurries containing hybrid fillers with various dimensions, electrical conductivities, and surface characteristics were studied for FCDI desalination. The desalination performance was significantly influenced by the electrical conductivity and surface hydrophilicity of activated carbons (ACs). Even though hydrophobic ACs with high conductivity showed better adsorption capacity, a stable operation of FCDI was not possible due to the poor dispersion of the AC slurry, resulting in the risk of obstructing the flow channels of the FCDI cells. Combining the merits of the dispersion quality of hydrophilic AC and the electrical conductivity of multiwalled carbon nanotubes (MWCNTs), a mixed slurry containing AC and MWCNTs was developed. The MWCNTs served as conductive bridges between the AC particles, creating a strong electron conduction network. With the addition of 0.10 wt % MWCNTs, a 70% improvement in SAC from 6.51 to 11.05 mg/g was achieved because of the formation of a well-developed electrical percolation network.

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ZIF-67 metal-organic frameworks and CNTs-derived nanoporous carbon structures as novel electrodes for flow-electrode capacitive deionization

Cited by 14 publications

References 44 publications

Significant Enhancement of Electrocatalytic Activity of Nickel-Based Amorphous Zeolite Imidazolate Frameworks for Water Splitting at Elevating Temperatures

Significant Enhancement of Electrocatalytic Activity of Nickel-Based Amorphous Zeolite Imidazolate Frameworks for Water Splitting at Elevating Temperatures

Comprehensive Electrochemical Impedance Spectroscopy Study of Flow-Electrode Capacitive Deionization Cells

Insights into the Particle Hydrophilicity and Electrical Conductivity for the Construction of a Highly Efficient Electrical Percolation Network in Flow Electrode Capacitive Deionization

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