Article
Engineering, Environmental
Dong-Hun Lee, Do-Hyeon Kim, Heechul Jung, Cheol-Min Park
Summary: Germanium is a highly researched anode material for Li-ion batteries due to its high Li storage capacity and electrical conductivity. The Li reaction pathways in germanium have been demonstrated through the analysis of nanocrystalline germanium. The electrochemical performance of a germanium-based nanocomposite, Ge/Al2O3/C, has been enhanced for better Li storage characteristics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jeong-Myeong Yoon, Young-Han Lee, Cheol-Min Park
Summary: This study investigates the use of two structural types of Ga as anodes for Li-ion batteries (LIBs) and develops an optimized Ga-based nanocomposite using a solid-state alloying-dealloying process. The nanocomposite effectively addresses the melting and agglomeration issues of Ga, improving the cycling stability and electrochemical performance of LIBs.
MATERIALS TODAY ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Qinfeng Zheng, Guanjie Li, Xiongwen Zheng, Lidan Xing, Kang Xu, Weishan Li
Summary: Sulfolane shows great potential as an electrolyte for lithium-ion batteries due to its non-flammability and high oxidation stability, but its incompatibility with graphitic anode limits its advantages. By increasing the fluorine content in the solvation sheath, a stable LiF-rich interphase on graphite can be formed, providing new insights into overcoming the failure mechanism and unlocking potential electrolyte solvent candidates for future high-voltage cathode materials in LIBs.
ENERGY & ENVIRONMENTAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hong Wang, Yuejin Ma, Wenming Zhang
Summary: The preparation of Fe3O4-Sn@CNFs with Fe3O4 and Sn nanoparticles loaded onto nanofibers surface resulted in an anode material with high reversible specific capacity and cycle stability, effectively increasing the electrochemical reaction sites and improving the rate and cycling performance of the electrodes.
Article
Chemistry, Physical
Muhammad Ashfaq Jamil, Ghulam Ali, Khurram Imran Khan, Faiza Jan Iftikhar, Sher Zaman, Shoyebmohamad F. Shaikh, Bidhan Pandit, Qamar Wali, Supriya A. Patil
Summary: In this study, SnF2/C nanocomposite with high capacity and stable cycling performance was prepared via a facile ball-milling method. The nanocomposite exhibited high rate capability and underwent conversion and alloying reactions during the discharge-charge process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Xiang Gao, Wenquan Lu, Jun Xu
Summary: This study investigates the atomic behavior of Li diffusion in Si/C composite materials using density functional theory, comparing two structural mixing formats: simple mixture and core-shell. It is found that carbon material increases Li diffusion in silicon by about 50%, with the mixture mode showing a more significant boost. The results offer new insights into Li diffusion behavior in Si/C composites and provide guidance for battery modeling and structure design.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Yujie Wang, Mingyu Zhang, Yuxuan Zhang, Yafeng Wang, Wenxin Liu, Chujie Yang, Veniamin Kondratiev, Feixiang Wu
Summary: In this study, a honeycombed CoF2@C nanocomposite was prepared to achieve excellent electrochemical performance for metal fluoride-lithium batteries. The honeycombed structure provided uniformly isolated nanospace to inhibit volume expansion and product agglomeration during the reaction, while the three-dimensional electron and ion conduction pathway facilitated high-capacity utilization.
Article
Materials Science, Multidisciplinary
Sheeraz Ashraf, Rimsha Mehek, Naseem Iqbal, Tayyaba Noor, Ghulam Ali, Abdul Wahab, Ahmed A. Qayyum, Awais Ahmad
Summary: The study showed that the composite of SnO2 with nanoporous carbon (Co-Sn@NC) synthesized using ZIF-67 exhibited enhanced structural stability and improved rate capacity for tin-based compounds. The research revealed that among the composites prepared with three different molar ratios of 2-methylimdazole, the carbon-based Co-Sn alloy with the highest amount of N-doped organic linker delivered the highest reversible capacity.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Xu Yi, Fuqin Zhang, Jie Wang, Sumei Wang, Hui Tong, Tianhui An, Wan-Jing Yu
Summary: The nitrogen-doped carbon encapsulated silicon nanoparticles hybridized with 3D graphene network demonstrated high specific capacity and excellent cyclic performance as a novel nanocomposite for lithium-ion battery anodes. The enhanced electrochemical performance of the N-C/Si@G nanocomposite is largely attributed to the synergistic effect of the nitrogen-doped carbon shell and the large void space of the 3D graphene network.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Yuansen Duan, Shaolin Du, Huachao Tao, Xuelin Yang
Summary: Tin has been considered as an ideal anode material for lithium ion batteries due to its high theoretical capacity, but its practical application is limited by poor cycling stability. Different structures, such as amorphous and crystalline, can significantly impact the electrochemical performance of Sn-based electrodes. In this study, it was found that the amorphous-Sn@C electrode exhibited higher capacity, better cycling stability, and rate capability compared to the crystalline-Sn@C electrode, attributing to enhanced strain regulation and defect sites. The results could serve as a reference for the development of high-capacity and long cycle life alloy-based anodes for lithium ion batteries.
Article
Chemistry, Multidisciplinary
Ho-Sung Yang, Byoung-Sun Lee, Woong-Ryeol Yu
Summary: This study reported the preparation of simple and highly commercial Si-Sn-C ternary composite electrodes with Si and Sn nanoparticles dispersed in solid CNFs or incorporated into the core of hollow CNFs, showing good rate performance and improved cycling performance. The core/shell structure of the Si-Sn-HC nanofibers was more beneficial for rate performance and cycling performance retention.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Engineering, Multidisciplinary
Vinoth Ganesan, Do-Hyeon Kim, Ki-Hun Nam, Cheol-Min Park
Summary: A robust hierarchical nanocube framework CoS2-C-CNT composite with nanocrystalline CoS2 encapsulated in a carbon matrix entangled in carbon nanotubes was synthesized and showed superior Li/Na-ion storage performances, delivering large reversible capacity, excellent cycling, and fast rate behavior during insertion and extraction processes.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Environmental
Huiqiao Liu, Yanan He, Kangzhe Cao, Yong Jiang, Xiaogang Liu, Qiang-Shan Jing, Lifang Jiao
Summary: This study presents a new approach to improve the Li-ion storage properties of aluminum anodes by replacing the natural Al2O3 passivation layer with Sn at room temperature. The obtained Al@Sn pellet electrode exhibits a larger reversible capacity and a lower voltage dip. Further attachment of graphene oxide (GO) enhances the storage properties of the electrode.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Tianming Lu, Jiachang Zhao, Jing Yuan, Jingli Xu, Jun Jin
Summary: The PbSe@C nanoflowers were synthesized and used in lithium-ion batteries, showing remarkable cyclic and rate performance. The carbon component in the nanocomposite enhances electrical conductivity and prevents agglomeration, while the nanocomposite's pores provide space for volume expansion during charge and discharge. The research on nanoflower structure provides a new direction for improving the performance of lead-based anode materials.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Lei Yan, Wenhui Yang, Haoxiang Yu, Liyuan Zhang, Jie Shu
Summary: In this review, the recent advances in rechargeable calcium-ion batteries (CIBs) are systematically summarized and discussed, including cathode and anode materials as well as the electrolytes. The relationship between the structures of electrode materials and their reaction mechanisms is comprehensively introduced. Moreover, the design strategies of electrode materials and suitable electrolytes are also elaborated to improve the energy density and enlarge the cycle life of CIBs.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Applied
Eunsoo Yu, Hyungguk Kim, Cheol-Min Park
Summary: The synthesis of heterocycles from 1,2-diarylalkene derivatives through electrosynthesis under metal- and oxidant-free conditions has been discovered. Reactive radical intermediates formed through cathodic reduction or anodic oxidation of specific compounds lead to the formation of various heterocyclic products with good functional group tolerance and high yields. Solvent-dependent chemoselectivity was observed, and mechanistic investigations helped elucidate the reaction mechanisms.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Clinical Neurology
Ja Hye Kim, Ji-Hyung Park, Junehawk Lee, Jung Woo Park, Hyun Jung Kim, Won Seok Chang, Dong-Seok Kim, Young Seok Ju, Eleonora Aronica, Jeong Ho Lee
Summary: In this study, we aimed to investigate the genetic etiology of focal cortical dysplasia type II (FCDII) by detecting brain somatic mutations in mTOR pathway genes. Despite the use of deep sequencing and analytics, about 40% of cases remained genetically unexplained. By isolating cells exhibiting phosphorylation of the S6 ribosomal protein (p-S6) in brain tissues and performing whole-genome sequencing, we found ultra-low level somatic mutations and germline structural variations in a significant portion of mutation-negative FCDII patients. Our method significantly increased the genetic diagnostic rate for FCDII.
ANNALS OF NEUROLOGY
(2023)
Article
Engineering, Environmental
Dong-Hun Lee, Do-Hyeon Kim, Heechul Jung, Cheol-Min Park
Summary: Germanium is a highly researched anode material for Li-ion batteries due to its high Li storage capacity and electrical conductivity. The Li reaction pathways in germanium have been demonstrated through the analysis of nanocrystalline germanium. The electrochemical performance of a germanium-based nanocomposite, Ge/Al2O3/C, has been enhanced for better Li storage characteristics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Ecology
Sang-Hee Lee, Cheol-Min Park, Sang-Bin Lee
Summary: This article discusses the search and transport efficiency of tunneling patterns in termites from an evolutionary perspective. Using an individual-based model, the study explores the impact of four variables on food transport efficiency and discusses potential optimization strategies and improvements for the model.
ECOLOGICAL MODELLING
(2022)
Article
Chemistry, Organic
Venkatesh Murugesh, Bokyeong Ryou, Cheol-Min Park
Summary: This paper describes the synthesis of unsymmetrical dithioacetals based on gold catalysis. While many methods have been developed for the preparation of symmetrical dithioacetals, methods for accessing unsymmetrical ones are still limited. The authors report a mild synthetic method with a broad substrate scope. Screening of various gold catalysts identified a catalyst that allows for efficient hydrothiolation of both activated and unactivated vinyl sulfides, and the reaction is compatible with both aryl and aliphatic thiols.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Chemistry, Physical
Ki-Hun Nam, Do-Hyeon Kim, Young-Han Lee, Su Choel Han, Jeong-Hee Choi, Yoon-Cheol Ha, Cheol-Min Park
Summary: Layered materials, especially silicon disulfide (SiS2), have received significant attention due to their diverse properties and potential applications. This study demonstrates a simple large-scale synthesis method for layered SiS2 and evaluates its performance as an anode material for Li-ion batteries. The SiS2 nanocomposite exhibits high Li-storage capacity, excellent cycling stability, and good rate capability. Furthermore, when incorporated into a Li-argyrodite solid-state electrolyte, SiS2 shows commendable air/moisture stability and high ionic conductivity. These findings suggest that layered SiS2 has great potential for various applications.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Seokjun Kim, Byeongwan Kim, Seonha Park, Won Seok Chang, Haeyong Kang, Seokho Kim, Habeom Lee, Songkil Kim
Summary: The electrical transport properties of graphene field-effect transistors (FETs) can be greatly enhanced when graphene is supported by a high-quality hexagonal boron nitride (h-BN) layer. Chemical vapor deposition (CVD) grown h-BN can have surface defects and impurities, which result in different electrical transport properties compared to mechanically exfoliated h-BN layers. Surface defects and impurities on the supporting h-BN layer induce p-doping and hysteresis in h-BN/graphene/h-BN FETs, which can be controlled by modulating a back-gate voltage. The presence of these defects and impurities allows for dynamic modulation of electrical charge states, making them useful for memristive devices or sensors.
SURFACES AND INTERFACES
(2023)
Article
Biochemistry & Molecular Biology
Younghee Seo, Sangheon Han, Byeong-Wook Song, Jin Woo Chang, Young Cheol Na, Won Seok Chang
Summary: This study investigated the activation of eNSCs and adult neurogenesis after low-intensity focused ultrasound (LIFUS) treatment, and found that LIFUS could activate eNSCs and promote the generation of adult neurons, suggesting its potential as a treatment for neurological damage and disorders.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Physics, Applied
Junha Choi, Young-Gwan Shin, Kwangwoo Cho, Won-Seok Chang, Sunghwan Chang, Sung-Hak Cho
Summary: Fabrication of line- and area-type laser-induced periodic surface structures (LIPSS) induced by a flat-top beam provides improved periodic uniformity in structure compared to fabrication with a Gaussian beam. The improved periodic uniformity induces high reproducibility and high performance through signal uniformity, making LIPSS induced by flat-top beam applicable in structural color, hydrophobicity control, and surface-enhanced Raman scattering.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Hien Duy Mai, Sangmin Jeong, Gi-Nam Bae, Ngoc Minh Tran, Jong-Sang Youn, Cheol-Min Park, Ki-Joon Jeon
Summary: Sulfidation of Pd species on monolayer MoS2 enhances the 1T-phase degree, leading to maximized metal utilization efficiency and exposure of active surface atoms. The resulting PdxSy/1T-MoS2 catalyst exhibits unprecedented high mass activity (-3444 A mg(Pd)(-1)) and turnover frequency (1892 s(-1)), three orders of magnitude higher than commercial Pt/C 10 wt%. The sulfidation-assisted 1T-phase enrichment has significant implications for the design of efficient electrocatalysts through MoS2 phase engineering.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Vinoth Ganesan, Young-Han Lee, Heechul Jung, Cheol-Min Park
Summary: In this study, a nanostructured porous polyhedral carbon (PPC) was synthesized as a carbon matrix for high-capacity Li/Na/K-alloy-based anode materials. The PPC matrix exhibited large initial reversible capacity, fast rate capability, better cyclic performance, high ionic diffusivity, and excellent structural robustness in Li/Na/K-ion batteries, indicating its potential usage in high-capacity alloy-based anode materials.
Article
Energy & Fuels
Young-Han Lee, In-Su Hwang, Jeong-Hee Choi, Cheol-Min Park
Summary: The electrochemical Li/Na/K-ion reaction pathways in Ga for high-performance Ga anodes in alkali-ion batteries are thoroughly elucidated using ex situ analytical tools. Ga exhibits a high Li-ion storage reaction, forming Li2Ga, but poor Na- and K-ion storage reactions, forming NaGa4 and K3Ga13, respectively. An amorphous Ga composite (Ga/C) is fabricated, showing high reversible capacity, long-term Li-ion storage stability, and high rate capability. Three-step confinement of amorphous Ga in the composite during cycling is demonstrated as an enhancement mechanism for high-performance Ga/C anodes for LIBs.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Jeong-Myeong Yoon, Young-Han Lee, Cheol-Min Park
Summary: This study investigates the use of two structural types of Ga as anodes for Li-ion batteries (LIBs) and develops an optimized Ga-based nanocomposite using a solid-state alloying-dealloying process. The nanocomposite effectively addresses the melting and agglomeration issues of Ga, improving the cycling stability and electrochemical performance of LIBs.
MATERIALS TODAY ENERGY
(2023)
Review
Clinical Neurology
Chanho Kong, Won Seok Chang
Summary: The blood-brain barrier (BBB) prevents many therapeutic agents from reaching the brain. Focused ultrasound (FUS) combined with microbubbles can temporarily open the BBB, allowing the delivery of therapeutic agents for neurological disorders. Preclinical studies have been conducted in the past 20 years, and the clinical application of FUS-mediated BBB opening is gaining popularity. It is important to understand the molecular and cellular effects of FUS-induced microenvironmental changes in the brain to ensure treatment efficacy and establish new strategies.
NEUROLOGY INTERNATIONAL
(2023)
Article
Pharmacology & Pharmacy
Eu-Gene Kim, Wonseok Chang, SangYep Shin, Anjana Silwal Adhikari, Geun Hee Seol, Dae-Yong Song, Sun Seek Min
Summary: It has been reported that early life stressful events can influence adult behavior and are associated with various psychiatric disorders. Maternal separation (MS) in animals is a well-known model for studying childhood stress and depression. This study investigated the effects of MS on anxiety and aggression-like behavior as well as the number of GABAergic neurons in the hippocampus. The results showed that MS led to increased anxiety and aggression in behavior tests and an increase in GAD67 and PV positive neurons in different regions of the hippocampus. These changes were accompanied by an increase in corticosterone, suggesting involvement of the HPA axis. Overall, MS alters anxiety and aggression levels, possibly through changes in hippocampal cytoarchitecture and HPA axis function.
KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY
(2023)
