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Carbon Energy 2021年第2期3卷 375-383页

作者： Tae-Yeol jeon Seung-Ho Yu sung j.yoo Hee-Young Park Sang-Kyung Kim Beamline Department Pohang Accelerator Laboratory(PAL)PohangRepublic of Korea Department of Chemical and Biological Engineering Korea UniversitySeoulRepublic of Korea Fuel Cell Center Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea Fuel Cell Research Center Korea Institute of Energy Research(KIER)DaejeonRepublic of Korea

Pt-Ni alloy nanocrystals with Pt-enriched shells were prepared by selective etching of surface Ni using sulfuric acid and *** changes in the electronic and geometric structure of the alloy nanoparticles at the surface were elucidated from the electrochemical surface area,the potential of zero total charge(PZTC),and relative surface roughness,which were determined from CO-and CO_(2)-displacement experiments before and after 3000 potential cycles under oxygen reduction reaction *** the highest activity and durability were achieved in hydroquinone-treated Pt–Ni,sulfuric acidtreated one showed the lower activity and durability despite its higher surface Pt concentration and alloying *** PZTC and QCO_(2)/QCO ratio(desorption charge of reductively adsorbed CO_(2) normalized by COad-stripping charge)depend on surface *** particular,QCO_(2)/QCO ratio change better reflects the roughness on an atomic scale,and PZTC is also affected by the electronic modification of Pt atoms in surface *** this study,a comparative study is presented to find a relationship between surface structure and electrochemical properties,which reveals that surface roughness plays a critical role to improve the electrochemical performance of Pt-Ni alloy catalysts with Pt-rich surfaces.

关键词： electrocatalyst fuel cell oxygen reduction reaction Pt-Ni surface roughness

Enhanced solid-electrolyte interface efficiency for practically viable hydrogen-air fuel cell systems

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journal of Energy Chemistry 2025年第1期100卷 356-368页

作者： Venkitesan Sakthivel Dong jin yoo Graduate School Department of Energy Storage/Conversion Engineering (BK21 FOUR) Hydrogen and Fuel Cell Research Center Jeonbuk National University Jeonju Department of Life Science Jeonbuk National University

Proton exchange membrane fuel cells （PEMFCs） provide an appealing sustainable energy system,with the solid-electrolyte membrane playing a crucial role in its overall ***,sulfonated poly（1,4-phenylene ether-ether sulfone）(SPEES),an aromatic hydrocarbon polymer,has garnered considerable attention as an alternative to Nafion ***,the long-term durability and stability of SPEES present a significant *** this context,we introduce a potential solution in the form of an additive,specifically a core–shell-based amine-functionalized iron titanate （A–Fe2TiO5）,which holds promise for improving the lifetime,proton conductivity,and power density of SPEES in *** modified SPEES/A–Fe2TiO5composite membranes exhibited notable characteristics,including high water uptake,enhanced thermomechanical stability,and oxidative ***,the SPEES membrane loaded with 1.2 wt%of A–Fe2TiO5demonstrates a maximum proton conductivity of 155 mS cm-1,a twofold increase compared to the SPEES membrane,at 80°C under 100%relative humidity （RH）.Furthermore,the 1.2 wt%of A–Fe2TiO5/SPEES composite membranes exhibited a maximum power density of 397.37 mW cm-2and a current density of 1148 mA cm-2at 60°C under 100%RH,with an opencircuit voltage decay of 0.05 m V/h during 103 h of continuous *** study offers significant insights into the development and understanding of innovative SPEES nanocomposite membranes for PEMFC applications.

关键词： Acid-base Hybrid membrane Proton conductivity Polymer electrolyte fuel cell Single-cell performance

Leading Approaches to Vascularize Kidney Constructs in Tissue Engineering

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Engineering 2022年第12期19卷 117-127页

作者： Diana S.Lim john D.jackson Anthony Atala james j.yoo Wake Forest Institute for Regenerative Medicine Wake Forest University School of MedicineMedical Center BoulevardNC 27157USA

There is an unprecedented need for new treatments for renal failure,as the incidence of this disease is increasing disproportionately to advancements in *** treatments are limited by the availability of viable organs,for which there is a worldwide *** treatment modalities also require a substantial amount of infrastructure,significantly limiting the access to care in most *** tissue engineering approaches promise to develop alternative solutions that address many of the inadequacies in current *** many advancements have been made—primarily in the past decade—in biofabrication and whole-organ tissue engineering,many challenges *** major hindrance to the progress of current tissue engineering approaches is establishing successful vascularization of developed engineered tissue *** review focuses on the recent advancements that address the vascular challenge,including the biofabrication of vasculature,whole-organ engineering through decellularization and recellularization approaches,microscale organogenesis,and vascularization using organoids in the context of kidney tissue *** also highlight the specific challenges that remain in developing successful strategies capable of clinical translation.

关键词： Kidney Vascularization Tissue engineering Biofabrication Organoids

Adenosine-treated bioprinted muscle constructs prolong cell survival and improve tissue formation

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Bio-Design and Manufacturing 2021年第3期4卷 441-451页

作者： Dongxu Ke Adam M.jorgensen Sang j.Lee james j.yoo Sean V.Murphy Wake Forest Institute for Regenerative Medicine Wake Forest School of MedicineWinston-SalemNCUSA Novaprint Therapeutics Suzhou Co. LtdSuzhouJiangsuChina

It is crucial to maintaining the viability of biofabricated human-sized tissues to ensure their successful survival and function after *** is a purine nucleoside that has the function to suppress cellular metabolism and has been previously proposed as a method to prolong cell viability under *** this study,we optimized the dose concentration of adenosine for incorporation into bioprinted constructs to preserve long-term cell viability in *** results showed that muscle cells(C2C12)containing 6,7,or 8 mM adenosine maintained high cell viability for 20 days under hypoxic conditions(0.1%O2),whereas cells without adenosine treatment showed 100%cell death after 11 *** 20 days under hypoxic conditions,muscle cells treated with adenosine proliferated and differentiated when transferred to normoxic *** these adenosine concentrations,6 mM was picked as the optimized adenosine concentration for further investigations due to its most effective results on improving cell *** bioprinted muscle constructs containing adenosine(6 mM)maintained high cell viability for 11 days under hypoxic conditions,while the control constructs without adenosine had no live *** in vivo validation,the bioprinted constructs with adenosine implanted under the dorsal subcutaneous space in mice,showed the enhanced formation of muscle tissue with minimal central necrosis and apoptosis,when compared to the constructs without *** positive in vitro and in vivo results demonstrate that the use of adenosine is an effective approach to preventing the challenge of hypoxia-induced necrosis in bioprinted tissues for clinical translation.

关键词： Bioprinting Hypoxia Adenosine Cell viability In vivo

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Re nanoclusters anchored on nanosheet supports: Formation of Re-O-matrix bonding and evaluation as all-pH-range hydrogen evolution reaction (HER) electrocatalysts

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journal of Energy Chemistry 2022年第6期31卷 185-193,I0006页

作者： Shiyu Xu Hao Li jeongbok Lee N.Clament Sagaya Selvam Baotao Kang jin Yong Lee Pil j.yoo School of Chemical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Chemistry Sungkyunkwan UniversitySuwon 16419Republic of Korea

Although the water splitting-based generation of hydrogen as an energy carrier can help to mitigate the global problems of energy shortage and climate change,the practical implementation of this strategy is hindered by the absence of inexpensive high-performance electrocatalysts for the hydrogen evolution reaction (HER).Re-based HER electrocatalysts exhibit predictable high performance within the entire pH range but suffer from arduous formation (i.e.,vulnerability to oxidation) and uncontrollable aggregation,which strongly discourages the maximisation of active site exposure required for activity *** overcome these limitations,we herein hydrothermally synthesise Re nanoclusters uniformly distributed on nanosheet supports,such as reduced graphene oxide nanosheets (Re NCs@rGO),revealing that this hybrid features abundant exposed active sites and high oxidation *** obtained electrocatalysts were elaborately characterized by microscopic and spectroscopic ***,density functional theory calculations confirm the optimised synthesis of Re NCs@rGO and indicate the crucial role of Re–O–C junction formation in securing *** effective suppression of Re nanocluster detachment/dissolution under HER conditions endows Re NCs@rGO with high electron conductivity and electrochemical stability,resulting in a durability superior to that of commercial Pt/C and an activity similar to that of this *** a result,Re NCs@rGO exhibited remarkably small HER overpotentials of 110,130,and 93 m V to deliver a current density of 10 mA cm^(-2) in 0.5 M H_(2)SO_(4),1 M PBS,and 1 M KOH,***,Re NCs@rGO is a promising alternative to conventional Pt-group-metal catalysts and should find applications in next-generation high-performance water splitting systems.

关键词： Hydrogen evolution reaction(HER) Hydrothermal synthesis Re nanoclusters Nanosheet supports Electrocatalysts

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Skin bioprinting:the future of burn wound reconstruction?

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Burns & Trauma 2019年第1期7卷 25-36页

作者： Mathew Varkey Dafydd O.Visscher Paul P.Mvan Zuijlen Anthony Atala james j.yoo Wake Forest Institute for Regenerative Medicine Wake Forest School of MedicineMedical Center BoulevardWinston-SalemNC 27101USA Department of Plastic Reconstructive and Hand SurgeryAmsterdam University Medical Center1081HVAmsterdamThe Netherlands Amsterdam Movement Sciences AmsterdamThe Netherlands Burn Center Red Cross Hospital1942LEBeverwijkThe Netherlands Association of Dutch Burn Centres 1942LEBeverwijkThe Netherlands

Burns are a significant cause of trauma,and over the years,the focus of patient care has shifted from just survival to facilitation of improved functional ***,burn treatment,especially in the case of extensive burn injuries,involves surgical excision of injured skin and reconstruction of the burn injury with the aid of skin *** skin substitutes do not contain all skin cell types and do not facilitate recapitulation of native skin ***-dimensional(3D)bioprinting for reconstruction of burn injuries involves layer-by-layer deposition of cells along with scaffolding materials over the injured *** bioprinting can be done either in situ or in *** these approaches are similar except for the site of printing and tissue *** are technological and regulatory challenges that need to be overcome for clinical translation of bioprinted skin for burn ***,the use of bioprinting for skin reconstruction following burns is promising;bioprinting will enable accurate placement of cell types and precise and reproducible fabrication of constructs to replace the injured or damaged ***,3D bioprinting is a very transformative technology,and its use for wound reconstruction will lead to a paradigm shift in patient *** this review,we aim to introduce bioprinting,the different stages involved,in vitro and in vivo skin bioprinting,and the various clinical and regulatory challenges in adoption of this technology.

关键词： Bioprinting Skin Burns Reconstruction

Application of Integrated Database to the Casting Design

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journal of Materials Science & Technology 2008年第3期24卷 351-355页

作者： In-sung Cho Seung-Mok yoo Chae-Ho Lim jeong-Kil Choi KITECH 7-47 Songdo-dongYeonsu-gu

Construction of integrated database including casting shapes with their casting design, technical knowledge, and thermophysical properties of the casting alloys were introduced in the present study. Recognition tech- nique for casting design by industrial computer tomography was used for the construction of shape database. Technical knowledge of the casting processes such as ferrous and non-ferrous alloys and their manufacturing process of the castings were accumulated and the search engine for the knowledge was developed. Database of thermophysical properties of the casting alloys were obtained via the experimental study, and the properties were used for the in-house computer simulation of casting process. The databases were linked with intelligent casting expert system developed in center for e-design, KITECH. It is expected that the databases can help non casting experts to devise the casting and its process. Various examples of the application by using the databases were shown in the present study.

关键词： Integrated database Casting design Shape recognition

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Investigation of transient and heterogeneous micro-climate around a human body in an enclosed personalized work environment

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Energy and Built Environment 2020年第4期1卷 423-431页

作者： Chong Wang sung-jun yoo Shin-ichi Tanabe Kazuhide Ito Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityJapan Faculty of Engineering Sciences Kyushu UniversityJapan Faculty of Science and Engineering Waseda UniversityJapan

Heterogeneous distribution of indoor environmental quality is known to have a great impact on human health,comfort,and productivity.A personalized work environment,that creates a localized and independent environ-ment with capsules or partitions,is being developed worldwide to provide workers with a space that enables undisturbed concentration on studying and ***,the minimized interior space of a personalized work environment can immediately cause adverse health impacts for occupant if the air quality and thermal en-vironment in the personalized work environment is not controlled ***,constant breathing can sharply increase the CO 2 concentrations in an interior space with an insufficient ventilation *** order to design a healthy and comfortable indoor environment,especially in a personalized work environment,it is important to predict precisely and comprehensively the transient and heterogeneous structure of the indoor envi-ronment formed around a human *** this background,we have developed an in silico human model that integrates a computational human model(virtual manikin combined with thermoregulation models)and respi-ratory model(virtual airway)for estimating indoor environmental quality,targeting the microclimate around a human body and breathing zone with high *** this study,we report the applicability of a comprehensive in silico human model to estimate the environ-mental quality in a personalized work environment.A coupled analysis of heat and contaminant transfer with computational fluid dynamics was conducted targeting the space around the in silico human model installed in a virtual personalized work *** informative data including human thermal comfort and breathing air quality were obtained,potentially forming the basis for the development of a digital twin of the personalized work environment and contributing to the design of a healthy,comfortable,and productive personalized work environme

关键词： Microclimate Indoor environment Digital twin Personalized work environment Computational fluid dynamics in silico human model

Decreasing inhaled contaminant dose of a factory worker through a hybrid Emergency Ventilation System:Performance evaluation in worst-case scenario

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Energy and Built Environment 2020年第3期1卷 319-326页

作者： Alicia Murga Zhengwei Long sung-jun yoo Eisaku Sumiyoshi Kazuhide Ito Faculty of Engineering Sciences Kyushu UniversityJapan School of Environmental Science and Engineering Tianjin UniversityChina Technical Research Institute Obayashi CorporationJapan

Air pollution is detrimental to human health,causing several human *** industrial microenvironment generates high levels of indoor airborne pollutants,becoming a pervasive issue for *** is essential to im-prove the indoor air quality in this workplace by applying enhanced ventilation systems to minimize inhalation *** ventilation is used in industrial buildings because of its stratified air distribution and low ***,in case of accidental pollutant release,an enhancement is needed to minimize inhalation *** study proposes a hybrid emergency ventilation system using localized push-pull ventilation to improve the installed displacement ventilation system of a representative *** fluid dynamics was ap-plied to calculate steady-state indoor air flow and volume-averaged pollutant *** performance was evaluated in terms of source position;a computer simulated person was integrated to the building to confirm effectiveness against personal *** showed marked improvement in performance when push-pull technique was used:room-averaged concentration diminished up to 91%while ventilation rate only increased 4%.Inhaled pollutant mitigation was achieved but performance dependence against leakage source and personal position was confirmed.

关键词： Computational fluid dynamics Hybrid ventilation Industrial environment Computer simulated person Inhalation exposure

Experimental study of oil mist characteristics generated from minimum quantity lubrication and flood cooling

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Energy and Built Environment 2021年第1期2卷 45-55页

作者： Yiwen Wang Alicia Murga Zhengwei Long sung-jun yoo Kazuhide Ito Tianjin Key Lab.of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin 300072China Faculty of Engineering Sciences Kyushu UniversityJapan

The use of metalworking fluids during machining can generate oil mist and endanger the health of *** order to study the characteristics and emission laws of oil mist generated by machining,this study constructed a test bench to simulate the turning *** affecting the oil mist generated in the minimum quantity lubrication(MQL)mode and flood cooling mode were studied by means of single-factor experiments,and the formation mechanisms of oil mist were *** results show that the oil mist generated by the MQL system has two main sources,the initial escape of oil mist into the air and the evaporation/condensation of oil *** centrifugation has almost no effect on oil mist formation in the MQL *** mass concentration of oil mist generated by the MQL system is proportional to the cutting oil flow *** the work-piece is at room temperature,increasing the air supply pressure and nozzle distance,increases the oil mist mass *** the flood cooling mode,the concentration of centrifugal aerosol is linearly and positively correlated with the relative centrifugal force generated by the work-piece,and the coefficient of determination(R 2)is above *** oil mist mass concentrations in MQL mode is 8.33 mg/m^(3)~305.88 mg/m^(3).The MMD and SMD are 0.74μm to 4.42μm and 0.31μm to 2.14μm,*** oil mist mass concentrations in flood cooling mode is 0.2 mg/m^(3)~22.42 mg/m^(3).The MMD and SMD are 1.81μm to 6.58μm and 0.45μm to 5.13μm,respectively.

关键词： Oil mist Metalworking fluids Minimum quantity lubrication Flood cooling Turning