The Experts below are selected from a list of 4668 Experts worldwide ranked by ideXlab platform

Jeyong Yoon - One of the best experts on this subject based on the ideXlab platform.

  • High-Desalination Performance via Redox Couple Reactionin the Multichannel Capacitive Deionization System
    ACS Sustainable Chemistry & Engineering, 2019
    Co-Authors: Nayeong Kim, Sung Pil Hong, Jiho Lee, Choonsoo Kim, Jeyong Yoon
    Abstract:

    Capacitive Deionization (CDI) has received much attention, which is considered as a promising electrochemical water desalination technology. However, an obstacle to its conventional application is ...

  • Rocking-Chair Capacitive Deionization for Continuous Brackish Water Desalination
    ACS Sustainable Chemistry & Engineering, 2018
    Co-Authors: Kyusik Jo, Sung Pil Hong, Jeyong Yoon
    Abstract:

    Capacitive Deionization (CDI) is considered an alternative desalination technology due to its easy operation, high energy efficiency, and environmentally friendly process. However, a separate regeneration step is required in typical CDI technologies that releases the absorbed ions on the electrodes which results in an inefficient and cost-intensive process. This study proposed a novel CDI system referred to as rocking-chair Capacitive Deionization (RCDI) that has a continuous brackish water desalination process which consists of a pair of Nafion-coated activated carbon electrodes and an anion-exchange membrane. The coated Nafion contributed to the cation selectivity of the carbon electrode, and it enabled a continuous desalination process during constant-current operation through a rocking-chair ion movement. From the desalination tests that included the analysis of the CDI Ragone plot, the RCDI has a high salt adsorption capacity (maximum of 44.5 mg g–1) with continuous operation. Furthermore, the RCDI d...

  • Rocking-Chair Capacitive Deionization for Continuous Brackish Water Desalination
    ACS Sustainable Chemistry & Engineering, 2018
    Co-Authors: Jaehan Lee, Sung Pil Hong, Jiho Lee, Seong-hwan Kim, Jeyong Yoon
    Abstract:

    Capacitive Deionization (CDI) is considered an alternative desalination technology due to its easy operation, high energy efficiency, and environmentally friendly process. However, a separate regen...

  • Direct energy recovery system for membrane Capacitive Deionization
    Desalination, 2016
    Co-Authors: Junil Kang, Jiho Lee, Taeyoung Kim, Hojoon Shin, Jeyong Yoon
    Abstract:

    Abstract Capacitive Deionization (CDI) is a water desalination technology using an electrical double layer based on non-faradaic process. One of the powerful advantages of CDI compared to other desalination technologies is that the energy consumed to desalinate can be partially recovered. In this study, we constructed the direct energy recovery system in a membrane Capacitive Deionization (MCDI) cell with a buck-boost converter and investigated the energy recovery ratio (recovered energy/consumed energy) under various operational conditions. As significant results, the higher energy recovery ratio was achieved with longer charging time and higher charging voltage in constant voltage (CV) charging and with lower charging current and higher concentration in constant current (CC) charging. These results revealed that the salt adsorption capacity plays an important role in the energy recovery process and that constant current charging is more favorable for energy recovery than constant voltage charging. This study is expected to provide a comprehensive guide for the construction and operation of the actual energy recovery system for enhancing energy efficiency in MCDI process.

Jianping Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Ion-selective asymmetric carbon electrodes for enhanced Capacitive Deionization
    RSC Advances, 2018
    Co-Authors: Tingting Yan, Liyi Shi, Jianping Zhang, Dengsong Zhang
    Abstract:

    With the development of Capacitive Deionization technology, charge efficiency and electrosorption capacity have become some of the biggest technical bottlenecks. Asymmetric activated carbon electrodes with ion-selective functional groups inspired by membrane Capacitive Deionization were developed to conquer these issues. The Deionization capacity increased from 11.0 mg g−1 to 23.2 mg g−1, and the charge efficiency increased from 0.54 to 0.84, due to ion-selective functional groups minimizing the co-ion effect. The charge efficiency and electrosorption capacity resulting from better wettability of these electrodes are effectively enhanced by grafting ion-selective functional groups, which are propitious to ion movement. In addition, asymmetric Deionization capacitors show better cycling stability and higher desalination rates. These experimental results have demonstrated that the modification of the ion-selective (oxygen-containing) functional groups on the surfaces of activated carbon could greatly minimize the co-ion effects and increase the salt removal from the solution. These results have indicated that the ion-selective asymmetric carbon electrodes can promote well the development of Deionization capacitors for practical desalination.

  • three dimensional macroporous graphene architectures as high performance electrodes for Capacitive Deionization
    Journal of Materials Chemistry, 2013
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Jianping Zhang, Xiaoru Wen, Qingdong Zhong
    Abstract:

    In order to obtain excellent desalination behavior during the Capacitive Deionization (CDI) process, electrodes should provide efficient pathways for ion and electron transport. Here we open up a new opportunity to prepare high performance Capacitive Deionization (CDI) electrodes based on three-dimensional macroporous graphene architectures (3DMGA). The 3DMGA were fabricated by a simple template-directed method using polystyrene microspheres as sacrificial templates. The resulting 3DMGA exhibited a 3D interconnected structure with large specific surface area and high electric conductivity. The electrochemical behavior of the 3DMGA electrodes was analyzed by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. It was found that the 3DMGA showed superiority in electrosorption capacitance, low inner resistance, high reversibility and excellent stability. The power and energy density analysis further demonstrated that the 3DMGA electrode had a higher power output and lower energy consumption. According to the electrochemical measurements, the 3DMGA is quite desirable for high performance and low energy consumption Capacitive Deionization. The desalination capacity was evaluated by a batch mode electrosorptive experiment in a NaCl aqueous solution. An excellent desalination behavior of the 3DMGA was obtained due to the large accessible surface area, high electric conductivity and unique 3D interconnected macroporous structure. The 3DMGA was confirmed to be a promising material for CDI application.

  • graphene prepared via a novel pyridine thermal strategy for Capacitive Deionization
    Journal of Materials Chemistry, 2012
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Xiaoru Wen, Jianping Zhang
    Abstract:

    A novel pyridine–thermal strategy for successive exfoliation and reduction of graphite oxide with the use of pyridine as the intercalating agent and dispersant is reported, and the obtained graphene exhibits a good performance in Capacitive Deionization.

  • Graphene prepared via a novel pyridine–thermal strategy for Capacitive Deionization
    Journal of Materials Chemistry, 2012
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Xiaoru Wen, Jianping Zhang
    Abstract:

    A novel pyridine–thermal strategy for successive exfoliation and reduction of graphite oxide with the use of pyridine as the intercalating agent and dispersant is reported, and the obtained graphene exhibits a good performance in Capacitive Deionization.

Tingting Yan - One of the best experts on this subject based on the ideXlab platform.

  • Ion-selective asymmetric carbon electrodes for enhanced Capacitive Deionization
    RSC Advances, 2018
    Co-Authors: Tingting Yan, Liyi Shi, Jianping Zhang, Dengsong Zhang
    Abstract:

    With the development of Capacitive Deionization technology, charge efficiency and electrosorption capacity have become some of the biggest technical bottlenecks. Asymmetric activated carbon electrodes with ion-selective functional groups inspired by membrane Capacitive Deionization were developed to conquer these issues. The Deionization capacity increased from 11.0 mg g−1 to 23.2 mg g−1, and the charge efficiency increased from 0.54 to 0.84, due to ion-selective functional groups minimizing the co-ion effect. The charge efficiency and electrosorption capacity resulting from better wettability of these electrodes are effectively enhanced by grafting ion-selective functional groups, which are propitious to ion movement. In addition, asymmetric Deionization capacitors show better cycling stability and higher desalination rates. These experimental results have demonstrated that the modification of the ion-selective (oxygen-containing) functional groups on the surfaces of activated carbon could greatly minimize the co-ion effects and increase the salt removal from the solution. These results have indicated that the ion-selective asymmetric carbon electrodes can promote well the development of Deionization capacitors for practical desalination.

  • Graphene-based materials for Capacitive Deionization
    Journal of Materials Chemistry, 2017
    Co-Authors: Peiying Liu, Tingting Yan, Liyi Shi, Ho Seok Park, Xuecheng Chen, Zhigang Zhao, Dengsong Zhang
    Abstract:

    Capacitive Deionization is an emerging technology for energy-efficient water desalination and has attracted more and more attention in recent years. The Capacitive Deionization technology is based on ion electrosorption at the surface of a pair of electrically charged electrodes, which are commonly composed of carbon materials. Among numerous electrode materials, graphene-based materials are outstanding, playing a vital role during the Deionization process due to their intriguing features. After a brief introduction of the theory and instruments of Capacitive Deionization, we systematically summarize the current progress in graphene nanosheets, porous graphene, graphene-based composites, surface tuned graphene and its composites as electrodes for Capacitive Deionization. We also present our perspectives on the development of graphene-based electrodes for Capacitive Deionization.

  • three dimensional macroporous graphene architectures as high performance electrodes for Capacitive Deionization
    Journal of Materials Chemistry, 2013
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Jianping Zhang, Xiaoru Wen, Qingdong Zhong
    Abstract:

    In order to obtain excellent desalination behavior during the Capacitive Deionization (CDI) process, electrodes should provide efficient pathways for ion and electron transport. Here we open up a new opportunity to prepare high performance Capacitive Deionization (CDI) electrodes based on three-dimensional macroporous graphene architectures (3DMGA). The 3DMGA were fabricated by a simple template-directed method using polystyrene microspheres as sacrificial templates. The resulting 3DMGA exhibited a 3D interconnected structure with large specific surface area and high electric conductivity. The electrochemical behavior of the 3DMGA electrodes was analyzed by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. It was found that the 3DMGA showed superiority in electrosorption capacitance, low inner resistance, high reversibility and excellent stability. The power and energy density analysis further demonstrated that the 3DMGA electrode had a higher power output and lower energy consumption. According to the electrochemical measurements, the 3DMGA is quite desirable for high performance and low energy consumption Capacitive Deionization. The desalination capacity was evaluated by a batch mode electrosorptive experiment in a NaCl aqueous solution. An excellent desalination behavior of the 3DMGA was obtained due to the large accessible surface area, high electric conductivity and unique 3D interconnected macroporous structure. The 3DMGA was confirmed to be a promising material for CDI application.

  • graphene prepared via a novel pyridine thermal strategy for Capacitive Deionization
    Journal of Materials Chemistry, 2012
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Xiaoru Wen, Jianping Zhang
    Abstract:

    A novel pyridine–thermal strategy for successive exfoliation and reduction of graphite oxide with the use of pyridine as the intercalating agent and dispersant is reported, and the obtained graphene exhibits a good performance in Capacitive Deionization.

  • Graphene prepared via a novel pyridine–thermal strategy for Capacitive Deionization
    Journal of Materials Chemistry, 2012
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Xiaoru Wen, Jianping Zhang
    Abstract:

    A novel pyridine–thermal strategy for successive exfoliation and reduction of graphite oxide with the use of pyridine as the intercalating agent and dispersant is reported, and the obtained graphene exhibits a good performance in Capacitive Deionization.

Hui Wang - One of the best experts on this subject based on the ideXlab platform.

  • three dimensional macroporous graphene architectures as high performance electrodes for Capacitive Deionization
    Journal of Materials Chemistry, 2013
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Jianping Zhang, Xiaoru Wen, Qingdong Zhong
    Abstract:

    In order to obtain excellent desalination behavior during the Capacitive Deionization (CDI) process, electrodes should provide efficient pathways for ion and electron transport. Here we open up a new opportunity to prepare high performance Capacitive Deionization (CDI) electrodes based on three-dimensional macroporous graphene architectures (3DMGA). The 3DMGA were fabricated by a simple template-directed method using polystyrene microspheres as sacrificial templates. The resulting 3DMGA exhibited a 3D interconnected structure with large specific surface area and high electric conductivity. The electrochemical behavior of the 3DMGA electrodes was analyzed by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. It was found that the 3DMGA showed superiority in electrosorption capacitance, low inner resistance, high reversibility and excellent stability. The power and energy density analysis further demonstrated that the 3DMGA electrode had a higher power output and lower energy consumption. According to the electrochemical measurements, the 3DMGA is quite desirable for high performance and low energy consumption Capacitive Deionization. The desalination capacity was evaluated by a batch mode electrosorptive experiment in a NaCl aqueous solution. An excellent desalination behavior of the 3DMGA was obtained due to the large accessible surface area, high electric conductivity and unique 3D interconnected macroporous structure. The 3DMGA was confirmed to be a promising material for CDI application.

  • graphene prepared via a novel pyridine thermal strategy for Capacitive Deionization
    Journal of Materials Chemistry, 2012
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Xiaoru Wen, Jianping Zhang
    Abstract:

    A novel pyridine–thermal strategy for successive exfoliation and reduction of graphite oxide with the use of pyridine as the intercalating agent and dispersant is reported, and the obtained graphene exhibits a good performance in Capacitive Deionization.

  • Graphene prepared via a novel pyridine–thermal strategy for Capacitive Deionization
    Journal of Materials Chemistry, 2012
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Xiaoru Wen, Jianping Zhang
    Abstract:

    A novel pyridine–thermal strategy for successive exfoliation and reduction of graphite oxide with the use of pyridine as the intercalating agent and dispersant is reported, and the obtained graphene exhibits a good performance in Capacitive Deionization.

Dengsong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Ion-selective asymmetric carbon electrodes for enhanced Capacitive Deionization
    RSC Advances, 2018
    Co-Authors: Tingting Yan, Liyi Shi, Jianping Zhang, Dengsong Zhang
    Abstract:

    With the development of Capacitive Deionization technology, charge efficiency and electrosorption capacity have become some of the biggest technical bottlenecks. Asymmetric activated carbon electrodes with ion-selective functional groups inspired by membrane Capacitive Deionization were developed to conquer these issues. The Deionization capacity increased from 11.0 mg g−1 to 23.2 mg g−1, and the charge efficiency increased from 0.54 to 0.84, due to ion-selective functional groups minimizing the co-ion effect. The charge efficiency and electrosorption capacity resulting from better wettability of these electrodes are effectively enhanced by grafting ion-selective functional groups, which are propitious to ion movement. In addition, asymmetric Deionization capacitors show better cycling stability and higher desalination rates. These experimental results have demonstrated that the modification of the ion-selective (oxygen-containing) functional groups on the surfaces of activated carbon could greatly minimize the co-ion effects and increase the salt removal from the solution. These results have indicated that the ion-selective asymmetric carbon electrodes can promote well the development of Deionization capacitors for practical desalination.

  • Graphene-based materials for Capacitive Deionization
    Journal of Materials Chemistry, 2017
    Co-Authors: Peiying Liu, Tingting Yan, Liyi Shi, Ho Seok Park, Xuecheng Chen, Zhigang Zhao, Dengsong Zhang
    Abstract:

    Capacitive Deionization is an emerging technology for energy-efficient water desalination and has attracted more and more attention in recent years. The Capacitive Deionization technology is based on ion electrosorption at the surface of a pair of electrically charged electrodes, which are commonly composed of carbon materials. Among numerous electrode materials, graphene-based materials are outstanding, playing a vital role during the Deionization process due to their intriguing features. After a brief introduction of the theory and instruments of Capacitive Deionization, we systematically summarize the current progress in graphene nanosheets, porous graphene, graphene-based composites, surface tuned graphene and its composites as electrodes for Capacitive Deionization. We also present our perspectives on the development of graphene-based electrodes for Capacitive Deionization.

  • three dimensional macroporous graphene architectures as high performance electrodes for Capacitive Deionization
    Journal of Materials Chemistry, 2013
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Jianping Zhang, Xiaoru Wen, Qingdong Zhong
    Abstract:

    In order to obtain excellent desalination behavior during the Capacitive Deionization (CDI) process, electrodes should provide efficient pathways for ion and electron transport. Here we open up a new opportunity to prepare high performance Capacitive Deionization (CDI) electrodes based on three-dimensional macroporous graphene architectures (3DMGA). The 3DMGA were fabricated by a simple template-directed method using polystyrene microspheres as sacrificial templates. The resulting 3DMGA exhibited a 3D interconnected structure with large specific surface area and high electric conductivity. The electrochemical behavior of the 3DMGA electrodes was analyzed by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. It was found that the 3DMGA showed superiority in electrosorption capacitance, low inner resistance, high reversibility and excellent stability. The power and energy density analysis further demonstrated that the 3DMGA electrode had a higher power output and lower energy consumption. According to the electrochemical measurements, the 3DMGA is quite desirable for high performance and low energy consumption Capacitive Deionization. The desalination capacity was evaluated by a batch mode electrosorptive experiment in a NaCl aqueous solution. An excellent desalination behavior of the 3DMGA was obtained due to the large accessible surface area, high electric conductivity and unique 3D interconnected macroporous structure. The 3DMGA was confirmed to be a promising material for CDI application.

  • graphene prepared via a novel pyridine thermal strategy for Capacitive Deionization
    Journal of Materials Chemistry, 2012
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Xiaoru Wen, Jianping Zhang
    Abstract:

    A novel pyridine–thermal strategy for successive exfoliation and reduction of graphite oxide with the use of pyridine as the intercalating agent and dispersant is reported, and the obtained graphene exhibits a good performance in Capacitive Deionization.

  • Graphene prepared via a novel pyridine–thermal strategy for Capacitive Deionization
    Journal of Materials Chemistry, 2012
    Co-Authors: Hui Wang, Tingting Yan, Liyi Shi, Dengsong Zhang, Xiaoru Wen, Jianping Zhang
    Abstract:

    A novel pyridine–thermal strategy for successive exfoliation and reduction of graphite oxide with the use of pyridine as the intercalating agent and dispersant is reported, and the obtained graphene exhibits a good performance in Capacitive Deionization.