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A study of highly activated hydrogen evolution reaction performance in acidic media by 2D heterostructure of N and S doped graphene on MoO_(x)

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Carbon Energy 2023年第11期5卷 68-80页

作者： Kubra Aydin Seongwon Woo Vinit Kaluram Kanade Seulgi Choi Chisung Ahn byungkwon lim Taesung Kim SKKU Advanced Institute of Nanotechnology(SAINT) Department of Nano Science and TechnologySungkyunkwan UniversitySuwon‐siGyeonggi‐doRepublic of Korea School of Advanced Material Science and Engineering Department of Nano Science and TechnologySungkyunkwan UniversitySuwonGyeonggi‐doRepublic of Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon‐siGyeonggi‐doRepublic of Korea Heat&Surface Technology R&D Department Korea Institute of Industrial TechnologySiheung‐siGyeonggi‐doRepublic of Korea

Herein,a layer of molybdenum oxide(MoO_(x)),a transition metal oxide(TMO),which has outstanding catalytic properties in combination with a carbonbased thin film,is modified to improve the hydrogen production performance and protect the MoO_(x)in acidic media.A thin film of graphene is transferred onto the MoO_(x)layer,after which the graphene structure is doped with N and S atoms at room temperature using a plasma doping method to modify the electronic structure and intrinsic properties of the *** oxygen functional groups in graphene increase the interfacial interactions and electrical contacts between graphene and MoO_(x).The appearance of surface defects such as oxygen vacancies can result in vacancies in MoO_(x).This improves the electrical conductivity and electrochemically accessible surface *** the number of defects in graphene by adding dopants can significantly affect the chemical reaction at the interfaces and improve the electrochemical *** defects in graphene play a crucial role in the adsorption of H^(+)ions on the graphene surface and their transport to the MoO_(x)layer *** enables MoO_(x)to participate in the reaction with the doped graphene.N^(‐)and S^(‐)doped graphene(NSGr)on MoO_(x)is active in acidic media and performs well in terms of hydrogen *** initial overpotential value of 359 mV for the current density of−10 mA/cm^(2)is lowered to 228 mV after activation.

关键词： heteroatom‐doped graphene hydrogen evolution reactions metal‐free catalysts transition metal oxides van der Waals(vdWs)heterostructures

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Nucleation and Growth Mechanisms for Pd-Pt Bimetallic Nanodendrites and Their Electrocatalytic Properties

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Nano Research 2010年第2期3卷 69-80页

作者： byungkwon lim Majiong Jiang Taekyung Yu Pedro H.C.Camargo Younan Xia Department of Biomedical Engineering Washington UniversitySt.LouisMissouri 63130USA Department of Chemistry Washington UniversitySt.LouisMissouri 63130USA

In a seed-mediated synthesis, nanocrystal growth is often described by assuming the absence of homogeneous nucleation in the solution. Here we provide new insights into the nucleation and growth mechanisms underlying the formation of bimetallic nanodendrites that are characterized by a dense array of Pt branches anchored to a Pd nanocrystal core. These nanostructures can be easily prepared by a one-step, seeded growth method that involves the reduction of K2PtCl4 by L-ascorbic acid in the presence of 9-nm truncated octahedral Pd seeds in an aqueous solution. Transmission electron microscopy (TEM) and high-resolution TEM analyses revealed that both homogeneous and heterogeneous nucleation of Pt occurred at the very early stages of the synthesis and the Pt branches grew through oriented attachment of small Pt particles that had been formed via homogeneous nucleation. These new findings contradict the generally accepted mechanism for seeded growth that only involves heterogeneous nucleation and simple growth via atomic addition. We have also investigated the electrocatalytic properties of the Pd-Pt nanodendrites for the oxygen reduction and formic acid oxidation reactions by conducting a comparative study with foam-like Pt nanostructures prepared in the absence of Pd seeds under otherwise identical conditions.

关键词： Palladium platinum seeded growth oxygen reduction formic acid oxidation

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New Insights into the Growth Mechanism and Surface Structure of Palladium Nanocrystals

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Nano Research 2010年第3期3卷 180-188页

作者： byungkwon lim Hirokazu Kobayashi Pedro H.G.Camargo Lawrence F.Allard Jingyue Liu Younan Xia Department of Biomedical Engineering Washington UniversitySt.LouisMissouri 63130USA Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Center for Nanoscience and Department of Chemistry and Biochemistry University of Missouri-St.LouisSt.LouisMissouri 63121USA

This paper presents a systematic study of the growth mechanism for Pd nanobars synthesized by reducing Na_(2)PdCl_(4) with L-ascorbic acid in an aqueous solution in the presence of bromide ions as a capping *** electron microscopy(TEM)and high-resolution TEM analyses revealed that the growth at early stages of the synthesis was dominated by particle coalescence,followed by shape focusing via recrystallization and further growth via atomic *** also investigated the detailed surface structure of the nanobars using aberration-corrected scanning TEM and found that the exposed{100}surfaces contained several types of defects such as an adatom island,a vacancy pit,and atomic *** thermal annealing,the nanobars evolved into a more thermodynamically favored shape with enhanced truncation at the corners.

关键词： Palladium nanocrystals growth coalescence surface evolution

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Synthesis and Optical Properties of Cubic Gold Nanoframes

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Nano Research 2008年第6期1卷 441-449页

作者： Leslie Au Yeechi Chen Fei Zhou Pedro H.C.Camargo byungkwon lim Zhi-Yuan Li David S.Ginger Younan Xia Department of Chemistry University of WashingtonSeattleWashington 98195USA Institute of Physics Chinese Academy of SciencesBeijing 100080China Department of Biomedical Engineering Washington UniversitySt.LouisMissouri 63130USA

This paper describes a facile method of preparing cubic Au nanoframes with open structures via the galvanic replacement reaction between Ag nanocubes and AuCl_(2)^(-).A mechanistic study of the reaction revealed that the formation of Au nanoframes relies on the diffusion of both Au and Ag *** effect of the edge length and ridge thickness of the nanoframes on the localized surface plasmon resonance peak was explored by a combination of discrete dipole approximation calculations and single nanoparticle *** their hollow and open structures,the Au nanoframes represent a novel class of substrates for applications including surface plasmonics and surface-enhanced Raman scattering.

关键词： Gold nanostructures galvanic replacement hollow nanostructures localized surface plasmon resonance surface-enhanced Raman scattering

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In-situ formation of MOF derived mesoporous Co3N/amorphous N-doped carbon nanocubes as an efficient electrocatalytic oxygen evolution reaction

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Nano Research 2019年第7期12卷 1605-1611页

作者： Bong Kyun Kang Seo Young Im Jooyoung Lee Sung Hoon Kwag Seok Bin Kwon SintayehuNibret Tiruneh Min-Jun Kim Jung Ho Kim Woo Seok Yang byungkwon lim Dae Ho Yoon Nano Materials and Components Research Center Korea Electronics Technology InstituteSeongnam 463-816Republic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 440-746Republic of Korea Advanced Materials & Processing Center Institute for Advanced Engineering (IAE)Yongin 175-28Republic of Korea Australian Institute for Innovative Materials (AIIM) University of WollongongSquires WayNorth Wollongong NSW 2500Australia Department of Advanced Materials Engineering for Information and Electronics Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do17104Republic of Korea

The suitable materials,metal nitrides,are a promising class of electrocatalyst materials for a highly efficient oxygen evolution reaction (OER) because they exhibit superior intrinsic conductivity and have higher sustainability than oxide-based *** our knowledge,for the first time,we report a designable synthesis of three-dimensional (3D) and mesoporous Co3N@ amorphous N-doped carbon (AN-C) nanocubes (NCs) with well-controlled open-framework structures via monodispersed Co3[Co(CN)6]2 Prussian blue analogue (PBA) NC precursors using in situ nitridation and calcination ***3N@AN-C NCs (2 h) demonstrate better OER activity with a remarkably low Tafel plot (69.6 mV-dec-1),low overpotential of 280 mV at a current density of 10 ***,excellent cycling stability in alkaline electrolytes was exhibited without morphological changes and voltage elevations,superior to most reported hierarchical structures of transition-metal nitride *** presented strategy for synergy effects of metal-organic frameworks (MOFs)-derived transition-metal nitrides-carbon hybrid nanostructures provides prospects for developing high-performance and advanced electrocatalyst materials.

关键词： transition-metal nitride metal organic framework mesoporous oxygen evaluation reaction alkaline water electrolysis

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Novel N-doped multichannel carbon nanofiber architecture with porous CoS nanoprisms for high-performance potassium-ion batteries

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Rare Metals 2024年第3期43卷 971-983页

作者： Jae Bong lim Seung-Keun Park Department of Advanced Materials Engineering Chung-Ang UniversityGyeonggi-do17546Republic of Korea Department of Intelligence Energy and Industry Chung-Ang UniversitySeoul06974Republic of Korea Western Seoul Center Korea Basic Science InstituteSeoul03759Republic of Korea

Potassium-ion batteries(PIBs)have gained significant attention as an alternative to lithium-ion batteries(LIBs)due to the abundance of potassium(K)and low ***,the difficulty in finding appropriate electrode materials that can efficiently store the larger K ions has hindered their practical ***,we report a novel anode material,N-doped multichannel carbon nanofibers embedded with porous CoS nanoprisms(CSP@NMCNF),for high-performance *** CSP@NMCNF was synthesized using a two-step strategy comprising of the electrospinning of Co acetate hydroxide nanoprism/binary polymer blend and a subsequent heat *** porous CoS nanoprisms with an anisotropic morphology were well aligned along the length axis of the N-doped multichannel carbon nanofibers,thus ensuring their structural stability during the repeated charge-discharge *** addition,numerous pores facilitated the transport of electrons and ***,the CSP@NMCNF anode exhibited excellent electrochemical performance,delivering a high specific capacity of 368 mAh·g^(-1)at 0.5 A·g^(-1)after 200 cycles and excellent rate capability(232 mAh·g^(-1)at 2.0 A·g^(-1)).

关键词： K-ion batteries Cobalt sulfide Multichannel structured composite Electrospinning Nanoprism Porous structure

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A short overview of the lead iodide residue impact and regulation strategies in perovskite solar cells

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Journal of Energy Chemistry 2024年第3期90卷 504-510,I0012页

作者： Eng Liang lim Zhanhua Wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021FujianChina

Lead iodide(PbI2) is a vital raw material for preparing perovskite solar cells(PSCs),and it not only takes part in forming the light absorption layer but also remains in the grain boundary as a *** other words,the PbI2 content in the precursor and as formed film will affect the efficiency and stability of the *** moderate residual PbI2,it passivates the bulk/surface defects of perovskite,reduces the interfacial recombination,promotes the perovskite stability,minimizes the device hysteresis,and so *** PbI2 residue will reduce the interfacial passivation effect and device *** addition to facilitating the non-radiative recombination,over PbI2 residue can also lead to electronic insulation in the grain boundary and deteriorate the device ***,the impact and regulation of PbI2 residue on the device performance and stability is still not fully ***,a comprehensive and detailed review is presented by discussing the PbI2 residue impact and its regulation strategies(i.e., elimination,facilitation and conversion of the residue PbI2) to manipulate the PbI2 content,distribution and ***,we also show future outlooks in this field,with an aim to help further the progression of high-efficiency and stable PSCs.

关键词： Lead iodide Residue Regulation Perovskite solar cells Efficiency Stability

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Reconfigurable transmissive metasurface with a combination of scissor and rotation actuators for independently controlling beam scanning and polarization conversion

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Microsystems & Nanoengineering 2024年第2期10卷 173-180页

作者： Chhunheng Lor Ratanak Phon Sungjoon lim Intelligent Semiconductor Engineering Chung-Ang UniversityHeukseok-DongDongjak-GuSeoul06974Republic of Korea School of Electrical and Electronic Engineering Chung-Ang UniversityHeukseok-DongDongjak-GuSeoul06974Republic of Korea

Polarization conversion and beam scanning metasurfaces are commonly used to reduce polarization mismatch and direct electromagnetic waves in a specific direction to improve the strength of a wireless ***,identifying suitable active and mechanically reconfigurable metasurfaces for polarization conversion and beam scanning is a considerable challenge,and the reported metasurfaces have narrow scanning ranges,are expensive,and cannot be independently *** this paper,we propose a reconfigurable transmissive metasurface combined with a scissor and rotation actuator for independently controlling beam scanning and polarization conversion *** metasurface is constructed with rotatable unit cells(UCs)that can switch the polarization state between right-handed(RHCP)and left-handed circular polarization(LHCP)by flipping the UCs to reverse their phase ***,independent beam scanning is achieved using the scissor actuator to linearly change the distance between the *** and experimental results confirm that the proposed metasurface can perform beam scanning in the range of 28°for both the positive and negative regions of a radiation pattern(RHCP and LHCP beams)at an operational frequency of 10.5 GHz.

关键词： beam rotation controlling

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Alterations of protein homeostasis in Alzheimer's disease:beyond Procrustean bed of endoplasmic reticulum stress and unfolded protein response

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Neural Regeneration Research 2024年第8期19卷 1645-1646页

作者： Dmitry lim Alexei Verkhratsky Department of Pharmaceutical Sciences Universitàdel Piemonte Orientale“Amedeo Avogadro”NovaraItaly Faculty of Biology Medicine and HealthThe University of ManchesterManchesterUK Achucarro Center for Neuroscience IKERBASQUEBasque Foundation for ScienceBilbaoSpain&Department of NeurosciencesUniversity of the Basque Country UPV/EHU and CIBERNEDLeioaSpain Department of Stem Cell Biology State Research Institute Centre for Innovative MedicineVilniusLithuania Department of Forensic Analytical Toxicology School of Forensic MedicineChina Medical UniversityShenyangLiaoning ProvinceChina

Alzheimer’s disease(AD)is a major age-related form of dementia with a number of cases exponentially growing,causing enormous social and economic impact on individuals and *** hallmarks of AD,evident in postmortem AD brains,include a massive loss of the grey matter in the neocortex,extracellular deposition of amyloid-β(Aβ)in the form of senile plaques and cerebrovascular amyloid angiopathy,and intra-neuronal accumulation of neurofibrillary tangles,formed by hyper-phosphorylated tau protein.

关键词： Alzheimer homeostasis cortex

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A review of understanding electrocatalytic reactions in energy conversion and energy storage systems via scanning electrochemical microscopy

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Journal of Energy Chemistry 2024年第4期91卷 155-177页

作者： Jihye Park Jong Hwan lim Jin-Hyuk Kang Jiheon lim Ho Won Jang Hosun Shin Sun Hwa Park Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Department of Material Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Applied Measurement Science University of Science and TechnologyDaejeon 34113Republic of Korea

To address climate change and promote environmental sustainability,electrochemical energy conversion and storage systems emerge as promising alternative to fossil fuels,catering to the escalating demand for *** optimal energy efficiency and cost competitiveness in these systems requires the strategic design of electrocatalysts,coupled with a thorough comprehension of the underlying mechanisms and degradation behavior occurring during the electrocatalysis *** electrochemical microscopy(SECM),an analytical technique for studying surface electrochemically,stands out as a powerful tool offering electrochemical *** possesses remarkable spatiotemporal resolution,enabling the visualization of the localized electrochemical activity and surface *** review compiles crucial research findings and recent breakthroughs in electrocatalytic processes utilizing the SECM methodology,specifically focusing on applications in electrolysis,fuel cells,and metal–oxygen batteries within the realm of energy conversion and storage *** with an overview of each energy system,the review introduces the fundamental principles of SECM,and aiming to provide new perspectives and broadening the scope of applied research by describing the major research categories within SECM.

关键词： Scanning electrochemical microscopy Electrocatalyst Electrocatalysis Water splitting Fuel cell Metal-oxygen battery

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