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  1. Article ; Online: The Polysulfide-Cathode Binding Energy Landscape for Lithium Sulfide Growth in Lithium-Sulfur Batteries.

    Kim, Kiwon / Kim, Jaehyun / Moon, Jun Hyuk

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2023  Volume 10, Issue 12, Page(s) e2206057

    Abstract: A cathode substrate with strong adsorption of lithium polysulfides (LiPSs) has been preferred for lithium-sulfur (Li-S) batteries. However, the recent finding that controlled growth of lithium sulfides ( ... ...

    Abstract A cathode substrate with strong adsorption of lithium polysulfides (LiPSs) has been preferred for lithium-sulfur (Li-S) batteries. However, the recent finding that controlled growth of lithium sulfides (Li
    Language English
    Publishing date 2023-03-01
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2808093-2
    ISSN 2198-3844 ; 2198-3844
    ISSN (online) 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202206057
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  2. Article ; Online: Balancing Electrolyte Donicity and Cathode Adsorption Capacity for High-Performance LiS Batteries.

    Kim, Kiwon / Kim, Taeyoung / Moon, Jun Hyuk

    Small (Weinheim an der Bergstrasse, Germany)

    2022  Volume 18, Issue 23, Page(s) e2201416

    Abstract: LiS batteries with high theoretical capacity are attracting attention as next-generation energy storage systems. Much effort has been devoted to the introduction of cathode materials with strong adsorption to sulfide species, but it is presented that ... ...

    Abstract LiS batteries with high theoretical capacity are attracting attention as next-generation energy storage systems. Much effort has been devoted to the introduction of cathode materials with strong adsorption to sulfide species, but it is presented that this selection should be refined in the application of high donicity electrolytes. The oxides with different adsorption capacities are explored while controlling the electrolyte donicity, confirming the trade-off effect between the donicity and the adsorption capacity for sulfur conversion. Specifically, a cathode substrate containing oxide nanoparticles of MgO, NiO, Fe
    Language English
    Publishing date 2022-05-09
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2168935-0
    ISSN 1613-6829 ; 1613-6810
    ISSN (online) 1613-6829
    ISSN 1613-6810
    DOI 10.1002/smll.202201416
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  3. Article ; Online: Linear Frequency Modulation and Orthogonal Code Modulation for Co-Located Multiple-Input Multiple-Output High-Frequency Surface Wave Radar

    Eunhee Kim / Sunghwan Sohn / Hyunwook Moon / Jun Hyeok Choi / Kiwon Lee

    Remote Sensing, Vol 16, Iss 1, p

    2023  Volume 104

    Abstract: A high-frequency surface wave radar (HFSWR) is the only sensor that provides inexpensive surveillance for up to 200 nautical miles (NM) of the exclusive economic zone in the 3–5 MHz band. However, because of its long wavelength, its angular resolution is ...

    Abstract A high-frequency surface wave radar (HFSWR) is the only sensor that provides inexpensive surveillance for up to 200 nautical miles (NM) of the exclusive economic zone in the 3–5 MHz band. However, because of its long wavelength, its angular resolution is low. Multiple-input multiple-output (MIMO) technology is an attractive method to improve angular resolution. This paper proposes MIMO waveforms and their processing that can be used in HFSWR systems. This dual modulation method applies linear frequency modulation to each pulse and orthogonal polyphase codes for a few consecutive pulses to enable MIMO processing. The proposed method can effectively remove the correlation of mutual interference and exhibits excellent performance in removing multiple-time-around echoes.
    Keywords MIMO ; HF surface wave radar ; orthogonal polyphase codes ; virtual array antenna ; Science ; Q
    Subject code 003 ; 535
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
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  4. Article ; Online: Unveiling the Effects of Nanostructures and Core Materials on Charge-Transport Dynamics in Heterojunction Electrodes for Photoelectrochemical Water Splitting.

    Kim, Kiwon / Yang, Jiwoo / Moon, Jun Hyuk

    ACS applied materials & interfaces

    2020  Volume 12, Issue 19, Page(s) 21894–21902

    Abstract: Understanding the photogenerated charge-transport dynamics of metal oxide electrodes is the key to providing a strategy for practical improvement in the photoelectrochemical reaction activity. Here, we analyze the electron transport of a 3D bicontinuous ... ...

    Abstract Understanding the photogenerated charge-transport dynamics of metal oxide electrodes is the key to providing a strategy for practical improvement in the photoelectrochemical reaction activity. Here, we analyze the electron transport of a 3D bicontinuous SnO
    Language English
    Publishing date 2020-05-04
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.0c03958
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  5. Article ; Online: Three-Dimensional Bicontinuous BiVO

    Kim, Kiwon / Moon, Jun Hyuk

    ACS applied materials & interfaces

    2018  Volume 10, Issue 40, Page(s) 34238–34244

    Abstract: A photoanode capable of high-efficiency water oxidation at low bias potential is essential for its practical application for photocathode-coupled tandem systems. To address this issue, a photoanode with low turn-on voltage for water oxidation and high ... ...

    Abstract A photoanode capable of high-efficiency water oxidation at low bias potential is essential for its practical application for photocathode-coupled tandem systems. To address this issue, a photoanode with low turn-on voltage for water oxidation and high charge separation efficiency at low bias potential is essential. In this study, we demonstrate the photoanode of the BiVO
    Language English
    Publishing date 2018-09-28
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.8b11241
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  6. Article ; Online: Highly Self-Healable Polymeric Coating Materials Based on Charge Transfer Complex Interactions with Outstanding Weatherability

    Pyong Hwa Hong / Gyeongmin Moon / Jinsil Kim / Kiwon Choi / Min Jae Ko / Ho Gyu Yoon / Sung Woo Hong

    Polymers, Vol 15, Iss 23, p

    2023  Volume 4544

    Abstract: In this study, we prepare highly self-healable polymeric coating materials using charge transfer complex (CTC) interactions. The resulting coating materials demonstrate outstanding thermal stability (1 wt% loss thermal decomposition temperature at 420 °C) ...

    Abstract In this study, we prepare highly self-healable polymeric coating materials using charge transfer complex (CTC) interactions. The resulting coating materials demonstrate outstanding thermal stability (1 wt% loss thermal decomposition temperature at 420 °C), rapid self-healing kinetics (in 5 min), and high self-healing efficiency (over 99%), which is facilitated by CTC-induced multiple interactions between the polymeric chains. In addition, these materials exhibit excellent optical properties, including transmittance over 91% and yellow index (YI) below 2, and show enhanced weatherability with a ΔYI value below 0.5 after exposure to UV light for 72 h. Furthermore, the self-healable coating materials developed in this study show outstanding mechanical properties by overcoming the limitations of conventional self-healing materials.
    Keywords polymeric coating ; self-healing ; charge transfer complex (CTC) ; engineering plastic ; weatherability ; Organic chemistry ; QD241-441
    Subject code 670
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Hyperband electro-optic modulator based on a two-pulley coupled lithium niobate racetrack resonator.

    Hwang, Hyeon / Nurrahman, Mohamad Reza / Heo, Hyungjun / Ko, Kiyoung / Moon, Kiwon / Ju, Jung Jin / Han, Sang-Wook / Jung, Hojoong / Lee, Hansuek / Seo, Min-Kyo

    Optics letters

    2024  Volume 49, Issue 3, Page(s) 658–661

    Abstract: Integrated optical modulators (IOMs) are crucial components of on-chip photonic circuits. However, most conventional IOMs are restricted to specific spectral bands. Here, we leveraged the wide transparency window of lithium niobate in conjunction with ... ...

    Abstract Integrated optical modulators (IOMs) are crucial components of on-chip photonic circuits. However, most conventional IOMs are restricted to specific spectral bands. Here, we leveraged the wide transparency window of lithium niobate in conjunction with the two-pulley coupled resonator method. This approach led to the development of a hyperband electro-optic (EO) modulator that operates over an expansive spectral range from 775 to 1550 nm on a single device. The demonstrated EO modulator exhibits half-wave voltage-length products of 0.25, 0.93, and 0.68 V·cm at wavelengths of 1539.50, 969.70, and 775.17 nm, respectively.
    Language English
    Publishing date 2024-02-01
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.514192
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  8. Article ; Online: Highly Self-Healable Polymeric Coating Materials Based on Charge Transfer Complex Interactions with Outstanding Weatherability.

    Hong, Pyong Hwa / Moon, Gyeongmin / Kim, Jinsil / Choi, Kiwon / Ko, Min Jae / Yoon, Ho Gyu / Hong, Sung Woo

    Polymers

    2023  Volume 15, Issue 23

    Abstract: In this study, we prepare highly self-healable polymeric coating materials using charge transfer complex (CTC) interactions. The resulting coating materials demonstrate outstanding thermal stability (1 wt% loss thermal decomposition temperature at 420 °C) ...

    Abstract In this study, we prepare highly self-healable polymeric coating materials using charge transfer complex (CTC) interactions. The resulting coating materials demonstrate outstanding thermal stability (1 wt% loss thermal decomposition temperature at 420 °C), rapid self-healing kinetics (in 5 min), and high self-healing efficiency (over 99%), which is facilitated by CTC-induced multiple interactions between the polymeric chains. In addition, these materials exhibit excellent optical properties, including transmittance over 91% and yellow index (YI) below 2, and show enhanced weatherability with a ΔYI value below 0.5 after exposure to UV light for 72 h. Furthermore, the self-healable coating materials developed in this study show outstanding mechanical properties by overcoming the limitations of conventional self-healing materials.
    Language English
    Publishing date 2023-11-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15234544
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  9. Article ; Online: Ursolic acid enhances autophagic clearance and ameliorates motor and non-motor symptoms in Parkinson's disease mice model.

    Bang, Yeojin / Kwon, Yoonjung / Kim, Mihyang / Moon, Soung Hee / Jung, Kiwon / Choi, Hyun Jin

    Acta pharmacologica Sinica

    2022  Volume 44, Issue 4, Page(s) 752–765

    Abstract: Protein aggregation and the abnormal accumulation of aggregates are considered as common mechanisms of neurodegeneration such as Parkinson's disease (PD). Ursolic acid (UA), a natural pentacyclic triterpenoid compound, has shown a protective activity in ... ...

    Abstract Protein aggregation and the abnormal accumulation of aggregates are considered as common mechanisms of neurodegeneration such as Parkinson's disease (PD). Ursolic acid (UA), a natural pentacyclic triterpenoid compound, has shown a protective activity in several experimental models of brain dysfunction through inhibiting oxidative stress and inflammatory responses and suppressing apoptotic signaling in the brain. In this study, we investigated whether UA promoted autophagic clearance of protein aggregates and attenuated the pathology and characteristic symptoms in PD mouse model. Mice were injected with rotenone (1 mg · kg
    MeSH term(s) Humans ; Mice ; Animals ; Parkinson Disease/drug therapy ; Parkinson Disease/metabolism ; Rotenone ; Neuroblastoma ; Autophagy/physiology ; Ubiquitins/therapeutic use ; Ursolic Acid
    Chemical Substances Rotenone (03L9OT429T) ; Ubiquitins
    Language English
    Publishing date 2022-09-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1360774-1
    ISSN 1745-7254 ; 0253-9756 ; 1671-4083
    ISSN (online) 1745-7254
    ISSN 0253-9756 ; 1671-4083
    DOI 10.1038/s41401-022-00988-2
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  10. Article ; Online: Electro-optic control of the external coupling strength of a high-quality-factor lithium niobate micro-resonator.

    Hwang, Hyeon / Heo, Hyungjun / Ko, Kiyoung / Nurrahman, Mohamad Reza / Moon, Kiwon / Ju, Jung Jin / Han, Sang-Wook / Jung, Hojoong / Lee, Hansuek / Seo, Min-Kyo

    Optics letters

    2023  Volume 47, Issue 23, Page(s) 6149–6152

    Abstract: Controlling the optical coupling between a micro-resonator and waveguide plays a key role in on-chip photonic circuits. Here, we demonstrate a two-point coupled lithium niobate (LN) racetrack micro-resonator that enables us to electro-optically traverse ... ...

    Abstract Controlling the optical coupling between a micro-resonator and waveguide plays a key role in on-chip photonic circuits. Here, we demonstrate a two-point coupled lithium niobate (LN) racetrack micro-resonator that enables us to electro-optically traverse a full set of the zero-, under-, critical-, and over-coupling regimes with minimized disturbance of the intrinsic properties of the resonant mode. The modulation between the zero- and critical-coupling conditions cost a resonant frequency shift of only ∼344.2 MHz and rarely changed the intrinsic quality (Q) factor of 4.6 × 10
    Language English
    Publishing date 2023-05-23
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.472956
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