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Energy & Environmental Materials 2024年第2期7卷 83-92页

作者： Hak Hyeon Lee Dong Su Kim Swagotom Sarker Ji Hoon choi Ho Seong Lee Hyung Koun Cho Department of Advanced Materials Science&Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-doSeoul 16419Korea Department of Advanced Materials Science&Engineering Kyungpook National University80Daehak-roBuk-guDaegu 41566Korea

Rh has been widely studied as a catalyst for the promising hydrazine oxidation reaction that can replace oxygen evolution reactions for boosting hydrogen production from hydrazine-containing *** Rh being expensive,only a few studies have examined its electrocatalytic mass ***,surface-limited cation exchange and electrochemical activation processes are designed to remarkably enhance the mass activity of *** atoms were readily replaced at the Ni sites on the surface of NiOOH electrodes by cation exchange,and the resulting RhOOH compounds were activated by the electrochemical reduction *** cation exchange-derived Rh catalysts exhibited particle sizes not exceeding 2 nm without agglomeration,indicating a decrease in the number of inactive inner Rh ***,an improved mass activity of 30 A mg_(Rh)^(-1)was achieved at 0.4 V versus reversible hydrogen ***,the two-electrode system employing the same CE-derived Rh electrodes achieved overall hydrazine splitting over 36 h at a stable low *** proposed surface-limited CE process is an effective method for reducing inactive atoms of expensive noble metal catalysts.

关键词： cation exchange synthesis electrochemical metallization hydrazine oxidation reaction mass activity rhodium catalyst

Electrokinetic-mechanism of water and furfural oxidation on pulsed laser-interlaced Cu_(2)O and CoO on nickel foam

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Journal of Energy Chemistry 2024年第4期91卷 145-154页

作者： Yewon Oh Jayaraman Theerthagiri M.L.Aruna Kumari Ahreum Min Cheol Joo Moon Myong Yong choi Department of Chemistry(BK21 FOUR) Research Institute of Natural SciencesGyeongsang National UniversityJinju 52828Republic of Korea Department of Chemistry The Oxford College of ScienceBengaluruKarnataka 560102India Core-Facility Center for Photochemistry&Nanomaterials Gyeongsang National UniversityJinju 52828Republic of Korea

The electrocatalytic oxidation of biomass-derived furfural(FF)feedstocks into 2-furoic acid(FA)holds immense industrial potential in optics,cosmetics,polymers,and ***,we fabricated Co O/Ni O/nickel foam(NF)and Cu_(2)O/Ni O/NF electrodes via in situ pulsed laser irradiation in liquids(PLIL)for the bifunctional electrocatalysis of oxygen evolution reaction(OER)and furfural oxidation reaction(FOR),*** oxidation of NF surface to NiO and deposition of CoO and/or Cu_(2)O on NF during PLIL offer distinct advantages for enhancing both the OER and ***/NiO/NF electrocatalyst provides a consistently low overpotential of~359 m V(OER)at 10 m A/cm^(2),achieving the maximum FA yield(~16.37 m M)with 61.5%selectivity,79.5%carbon balance,and a remarkable Faradaic efficiency of~90.1%during 2 h of FOR at 1.43 V(*** hydrogen electrode).Mechanistic pathway via in situ electrochemical-Raman spectroscopy on CoO/NiO/NF reveals the involvement of phase transition intermediates(NiOOH and CoOOH)as surface-active centers during electrochemical *** carbonyl carbon in FF is attacked by hydroxyl groups to form unstable hydrates that subsequently undergo further oxidation to yield FA *** method holds promise for large-scale applications,enabling simultaneous production of renewable building materials and fuel.

关键词： Pulsed laser irradiation in liquids Water and furfural oxidation In situ Raman spectroscopy CoO/NiO/nickel foam Cu_(2)O/Nio/nickel foam 2-furoic acid

Recent Developments in Metallic Degradable Micromotors for Biomedical and Environmental Remediation Applications

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Nano-Micro Letters 2024年第3期16卷 1-35页

作者： Sourav Dutta Seungmin Noh Roger Sanchis Gual Xiangzhong Chen Salvador Pané Bradley J.Nelson Hongsoo choi Department of Robotics and Mechatronics Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea DGIST‑ETH Microrobotics Research Center DGISTDaegu 42988Republic of Korea Multi‑Scale Robotics Lab Institute of Robotics and Intelligent SystemsETH Zurich8092 ZurichSwitzerland Institute of Optoelectronics State Key Laboratory of Photovoltaic Science and TechnologyShanghai Frontiers Science Research Base of Intelligent Optoelectronics and PerceptionFudan UniversityShanghai 200433People’s Republic of China

Synthetic micromotor has gained substantial attention in biomedicine and environmental ***-based degradable micromotor composed of magnesium(Mg),zinc(Zn),and iron(Fe)have promise due to their nontoxic fuel-free propulsion,favorable biocompatibility,and safe excretion of degradation products Recent advances in degradable metallic micromotor have shown their fast movement in complex biological media,efficient cargo delivery and favorable biocompatibility.A noteworthy number of degradable metal-based micromotors employ bubble propulsion,utilizing water as fuel to generate hydrogen *** novel feature has projected degradable metallic micromotors for active in vivo drug delivery *** addition,understanding the degradation mechanism of these micromotors is also a key parameter for their design and *** propulsion efficiency and life span govern the overall performance of a degradable metallic *** we review the design and recent advancements of metallic degradable ***,we describe the controlled degradation,efficient in vivo drug delivery,and built-in acid neutralization capabilities of degradable micromotors with versatile biomedical ***,we discuss micromotors’efficacy in detecting and destroying environmental ***,we address the limitations and future research directions of degradable metallic micromotors.

关键词： Magnesium Zinc Iron Biodegradable microrobot Biomedical Environmental

Ultra-robust informational metasurfaces based on spatial coherence structures engineering

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Light(Science & Applications) 2024年第7期13卷 1310-1319页

作者： Leixin Liu Wenwei Liu Fei Wang Xiaofeng Peng Duk-Yong choi Hua Cheng Yangjian Cai Shuqi Chen Shandong Provincial Engineering and Technical Center of Light Manipulations Collaborative Innovation Center of Light Manipulation and ApplicationsShandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250014China. The Key Laboratory of Weak Light Nonlinear Photonics Ministry of EducationSchool of PhysicsSchool of Materials Science and EngineeringSmart Sensing Interdisciplinary Science CenterNankai UniversityTianjin 300071China. School of Physical Science and Technology Soochow UniversitySuzhou 215006China. Laser Physics Centre Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia. The Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShanxi 030006China

Optical information transmission is vital in modern optics and photonics due to its concurrent and multi-dimensional nature,leading to tremendous applications such as optical microscopy,holography,and optical *** optical information transmission technologies suffer from bulky optical setup and information loss/crosstalk when meeting scatterers or obstacles in the light ***,we theoretically propose and experimentally realize the simultaneous manipulation of the coherence lengths and coherence structures of the light beams with the disordered *** ultra-robust optical information transmission and self-reconstruction can be realized by the generated partially coherent beam with modulated coherence structure even 93%of light is recklessly obstructed during light transmission,which brings new light to robust optical information transmission with a single *** method provides a generic principle for the generalized coherence manipulation on the photonic platform and displays a variety of functionalities advancing capabilities in optical information transmission such as meta-holography and imaging in disordered and perturbative media.

关键词： optics coherent holography

Sustainable Furfural Biomass Feedstocks Electrooxidation toward Value-Added Furoic Acid with Energy-Saving H2 Fuel Production Using Pt-Decorated Co3O4 Nanospheres

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Energy & Environmental Materials 2024年第2期7卷 354-362页

作者： Talshyn Begildayeνa Jayaraman Theerthagiri Seung Jun Lee Ahreum Min Gyeong-Ah Kim Siνakumar Manickam Myong Yong choi Department of Chemistry (BK21 FOUR) Core-Facility Center for Photochemistry & Nanomaterials Research Institute of Natural Sciences Gyeongsang National University Petroleum and Chemical Engineering Faculty of Engineering Universiti Teknologi Brunei Jalan Tungku Link Gadong Bandar Seri Begawan BE1410 Brunei Darussalam Prof.

Here,furfural oxidation was performed to replace the kinetically sluggish O2evolution reaction（OER）.Pt-Co3O4nanospheres were developed via pulsed laser ablation in liquid（PLAL） in a single step for the paired electrocatalysis of an H2evolution reaction（HER） and furfural oxidation reaction（FOR）.The FOR afforded a high furfural conversion（44.2%） with a major product of2-furoic acid after a 2-h electrolysis at 1.55 V versus reversible hydrogen electrode in a 1.0-M KOH/50-mM furfural *** Pt-Co3O4electrode exhibited a small overpotential of 290 mV at 10 mA *** an anode and cathode in an electrolyzer system,the Pt-Co3O4electrocatalyst required only a small applied cell voltage of ～1.83 V to deliver 10 mA cm-2,compared with that of the pure water electrolyzer（OER‖HER,～1.99 V）.This study simultaneously realized the integrated production of energy-saving H2 fuel at the cathode and 2-furoic acid at the anode.

关键词： biomass conversion electrochemical furfural oxidation overall water splitting Pt-Co3O4 electrocatalyst pulsed laser ablation in liquid

甘油三酯催化转化为柴油、喷气燃料和润滑油基础油

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Chinese Journal of Catalysis 2024年第3期58卷 15-24页

作者： Yaejun Baik Kyeongjin Lee Minkee choi 韩国科学技术高级研究院化学与生物分子工程系韩国大田34141

将生物质转化为可持续燃料和化学品对于解决环境问题、减少碳排放、增强能源安全以及促进经济和社会发展至关重要.在众多生物质原料中,来自不同来源的甘油三酯,如植物油、动物脂肪和微藻油,因其低氧含量和脂肪酸单元中的高度石蜡骨架,... 详细信息

将生物质转化为可持续燃料和化学品对于解决环境问题、减少碳排放、增强能源安全以及促进经济和社会发展至关重要.在众多生物质原料中,来自不同来源的甘油三酯,如植物油、动物脂肪和微藻油,因其低氧含量和脂肪酸单元中的高度石蜡骨架,与石油衍生烃的结构相似,而特别适合生产可持续的烃燃料和化学品.这意味着通过相对简单的催化转化过程,就能有效地将甘油三酯转化为烃类产物.本文概述了甘油三酯通过加氢过程转化为无氧燃料(如柴油和喷气燃料)以及润滑油基础油等高附加值产品的过程.此外,还根据反应机理讨论了所需催化剂的重要结构性质,以及甘油三酯的不同脂肪酸组成对催化转化过程的影响.

关键词：甘油三酯脱氧柴油喷气燃料润滑油基础油加氢处理的植物油加氢处理的酯和脂肪酸可持续航空燃料

Investigation of Refractory Bricks and Oxide Materials Heated in Hydrogen Reduction Conditions

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China's Refractories 2024年第2期33卷 22-26页

作者： Sangbae choi Raehyeong PARK Gideok YANG Yeonghyeon KIM Chosun Refractories Co. Ltd.Seongnam 463-020South Korea

This study aims to provide the basic knowledge for furnace refractory design by investigating refractory property changes occurred in a hydrogen *** refractory bricks are thermodynamically stable in a hydrogen atmosphere at 1100°C,we tried to find out the minute *** this experiment,a refractory brick was prepared by andalusite,mullite chamotte,and clay as raw materials and heated to 1100°C in a 100%hydrogen atmosphere for 72 *** was found that the strength of the brick was decreased and the color was changed to black by the reduction of *** in addition,this study covered research on the slaking risk of MgO raw materials because the minimum temperature is expected to 400°C in fluidized reduction furnaces unlike shaft furnaces.

关键词： hydrogen reduction furnace refractory bricks refractory raw materials

Elevating Image Steganography:A Fusion of MSB Matching and LSB Substitution for Enhanced Concealment Capabilities

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Computers, Materials & Continua 2024年第5期79卷 2923-2943页

作者： Muhammad Zaman Ali Omer Riaz Hafiz Muhammad Hasnain Waqas Sharif Tenvir Ali Gyu Sang choi Department of Information Technology The Islamia University of BahawalpurBahawalpur63100Pakistan Department of Computer Science The Islamia University of BahawalpurBahawalpur63100Pakistan School of Computer Science and Engineering Yeungnam UniversityGyeongbuk38541Korea

In today’s rapidly evolving landscape of communication technologies,ensuring the secure delivery of sensitive data has become an essential *** overcome these difficulties,different steganography and data encryption methods have been proposed by researchers to secure *** of the proposed steganography techniques achieve higher embedding capacities without compromising visual imperceptibility using LSB *** this work,we have an approach that utilizes a combinationofMost SignificantBit(MSB)matching andLeast Significant Bit(LSB)*** proposed algorithm divides confidential messages into pairs of bits and connects them with the MSBs of individual pixels using pair matching,enabling the storage of 6 bits in one pixel by modifying a maximum of three *** proposed technique is evaluated using embedding capacity and Peak Signal-to-Noise Ratio(PSNR)score,we compared our work with the Zakariya scheme the results showed a significant increase in data concealment *** achieved results of ourwork showthat our algorithmdemonstrates an improvement in hiding capacity from11%to 22%for different data samples while maintaining a minimumPeak Signal-to-Noise Ratio(PSNR)of 37 *** findings highlight the effectiveness and trustworthiness of the proposed algorithm in securing the communication process and maintaining visual integrity.

关键词： Steganography most significant bit(MSB) least significant bit(LSB) peak signal-to-noise ratio(PSNR)

A Cu-Pd alloy catalyst with partial phase separation for the electrochemical CO_(2) reduction reaction

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Journal of Energy Chemistry 2024年第6期93卷 8-15,I0001页

作者： Gyeong Ho Han Jung Yong Seo Minji Kang Myung-gi Seo Youngheon choi Soo Young Kim Sang Hyun Ahn School of Chemical Engineering and Material Science Chung-Ang UniversitySeoul 06974Republic of Korea Lotte Chemical Institute of Technology Daejeon 34110Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea

Cu catalysts can convert CO_(2) through an electrochemical reduction reaction into a variety of useful carbon-based ***,this capability provides an obstacle to increasing the selectivity for a single ***,we report a simple fabrication method for a Cu-Pd alloy catalyst for use in a membrane electrode assembly(MEA)-based CO_(2) electrolyzer for the electrochemical CO_(2) reduction reaction(ECRR)with high selectivity for CO *** the composition of the Cu-Pd alloy catalyst was fabricated at 6:4,the selectivity for CO increased and the production of multi-carbon compounds and hydrogen is *** a Cu-Pd alloy catalyst with 6:4 ratio as the cathode of the MEAbased CO_(2) electrolyzer showed a CO faradaic efficiency of 92.8%at 2.4 V_(cell).We assumed that these results contributed from the crystal planes on the surface of the Cu-Pd *** phases of the Cu-Pd alloy catalyst were partially separated through annealing to fabricate a catalyst with high selectivity for CO at low voltage and C_(2)H_4 at high *** results of CO-stripping testing confirmed that when Cu partially separates from the lattice of the Cu-Pd alloy,the desorption of~*CO is suppressed,suggesting that C-C coupling reaction is favored.

关键词： Cu-Pd catalyst Electrodeposition Electrochemical carbon dioxide reduction Partial phase separation Membrane electrode assembly-based electrolyzer

KoNA:Korean Nucleotide Archive as A New Data Repository for Nucleotide Sequence Data

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Genomics, Proteomics & Bioinformatics 2024年第1期22卷 161-167页

作者： Gunhwan Ko Jae Ho Lee Young Mi Sim Wangho Song Byung-Ha Yoon Iksu Byeon Bang Hyuck Lee Sang-Ok Kim Jinhyuk choi Insoo Jang Hyerin Kim Jin Ok Yang Kiwon Jang Sora Kim jong-Hwan Kim jongbum Jeon Jaeeun Jung Seungwoo Hwang Ji-Hwan Park Pan-Gyu Kim Seon-Young Kim Byungwook Lee Korea Bioinformation Center Korea Research Institute of Bioscience&BiotechnologyDaejeon 34141Republic of Korea

During the last decade,the generation and accumulation of petabase-scale high-throughput sequencing data have resulted in great challenges,including access to human data,as well as transfer,storage,and sharing of enormous amounts of *** promote data-driven biological research,the Korean government announced that all biological data generated from government-funded research projects should be deposited at the Korea BioData Station(K-BDS),which consists of multiple databases for individual data ***,we introduce the Korean Nucleotide Archive(KoNA),a repository of nucleotide sequence *** of July 2022,the Korean Read Archive in KoNA has collected over 477 TB of raw next-generation sequencing data from national genome *** ensure data quality and prepare for international alignment,a standard operating procedure was adopted,which is similar to that of the International Nucleotide Sequence Database *** standard operating procedure includes quality control processes for submitted data and metadata using an automated pipeline,followed by manual *** ensure fast and stable data transfer,a high-speed transmission system called GBox is used in ***,the data uploaded to or downloaded from KoNA through GBox can be readily processed using a cloud computing service called *** seamless coupling of KoNA,GBox,and Bio-Express enhances the data experience,including submission,access,and analysis of raw nucleotide *** not only satisfies the unmet needs for a national sequence repository in Korea but also provides datasets to researchers globally and contributes to advances in *** KoNA is available at https://***/kona/.

关键词： Korea BioData Station Nucleotide sequence Next-generation sequencing repository Genomics Deposition and access of big data