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Enhancing BiVO_(4)photoanode performance by insertion of an epitaxial BiFeO_(3)ferroelectric layer

Journal of Energy Chemistry 2024年第2期89卷 71-78,I0003页

作者： Haejin Jang Yejoon Kim Hojoong Choi Jiwoong Yang Yoonsung Jung Sungkyun Choi donghyeon lee Ho Won Jang Sanghan lee School of Materials Science and Engineering Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea

BiVO_(4)(BVO)is a promising material as the photoanode for use in photoelectrochemical ***,the high charge recombination and slow charge transfer of the BVO have been obstacles to achieving satisfactory photoelectrochemical *** address this,various modifications have been attempted,including the use of ferroelectric *** materials can form a permanent polarization within the layer,enhancing the separation and transport of photo-excited electron-hole *** this study,we propose a novel approach by depositing an epitaxial BiFeO_(3)(BFO)thin film underneath the BVO thin film(BVO/BFO)to harness the ferroelectric property of *** self-polarization of the inserted BFO thin film simultaneously functions as a buffer layer to enhance charge transport and a hole-blocking layer to reduce charge *** a result,the BVO/BFO photoanodes showed more than 3.5 times higher photocurrent density(0.65 mA cm^(-2))at 1.23 V_(RHE)under the illumination compared to the bare BVO photoanodes(0.18 m A cm^(-2)),which is consistent with the increase of the applied bias photon-to-current conversion efficiencies(ABPE)and the result of electrochemical impedance spectroscopy(EIS)*** results can be attributed to the self-polarization exhibited by the inserted BFO thin film,which promoted the charge separation and transfer efficiency of the BVO photoanodes.

关键词： Photoelectrochemical Photoanode BiVO_(4) Ferroelectric materials BiFeO_(3)

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The TNFα/TNFR2 axis mediates natural killer cell proliferation by promoting aerobic glycolysis

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Cellular & Molecular Immunology 2023年第10期20卷 1140-1155页

作者： Abrar Ul Haq Khan Alaa Kassim Ali Bryan Marr donghyeon Jo Simin Ahmadvand Claire Fong-McMaster Saeedah Musaed Almutairi Lisheng Wang Subash Sad Mary-Ellen Harper Seung-Hwan lee Department of Biochemistry Microbiologyand ImmunologyFaculty of MedicineUniversity of OttawaOttawaONCanada The University of Ottawa Centre for Infection Immunityand InflammationOttawaONCanada Botany and Microbiology Department College of SciencesKing Saud UniversityRiyadhSaudi Arabia

Natural killer(NK)cells are predominant innate lymphocytes that initiate the early immune response during *** cells undergo a metabolic switch to fuel augmented proliferation and activation following *** necrosis factor-alpha(TNFα)is a well-known inflammatory cytokine that enhances NK cell function;however,the mechanism underlying NK cell proliferation in response to TNFαis not well ***,we demonstrated that upon infection/inflammation,NK cells upregulate the expression of TNF receptor 2(TNFR2),which is associated with increased proliferation,metabolic activity,and effector ***,IL-18 can induce TNFR2 expression in NK cells,augmenting their sensitivity toward TNFα.Mechanistically,TNFα-TNFR2 signaling upregulates the expression of CD25(IL-2Rα)and nutrient transporters in NK cells,leading to a metabolic switch toward aerobic *** analysis revealed significantly reduced expression levels of genes involved in cellular metabolism and proliferation in NK cells from TNFR2 KO ***,our data affirmed that genetic ablation of TNFR2 curtails CD25 upregulation and TNFα-induced glycolysis,leading to impaired NK cell proliferation and antiviral function during MCMV infection in ***,our results delineate the crucial role of the TNFα-TNFR2 axis in NK cell proliferation,glycolysis,and effector function.

关键词： Natural killer cells TNFa TNFR2 Glycolysis Proliferation Murine cytomegalovirus

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Performance of Tractor Diesel Engine with Animal-Fats Biodiesel

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Journal of Agricultural Science and Technology(B) 2013年第9期3卷 648-655页

作者： Youngjung Kim Siyoung lee Jonggoo Kim donghyeon Kim Honggi Choi Energy and Environmental Division Department of Agricultural Engineering National Academy of Agricultural Science Rural Development Administration Suwon Republic of Korea

Animal fats biodiesel were manufactured and tested for its performance in the tractor engine and fuel adoptability in the field works. Four different fuels, three different content of biodiesel （BD20, BD50 and BD100） and light oil, were prepared and tested in the four strokes diesel engine. Power output, fuel consumption rate and exhaust gases of the four fuels in the diesel engine were compared and discussed. Power output of light oil engine was the greatest showing 5.3% difference between light oil and BDI00. But, almost no power difference between light oil engine and BD20 engine, light oil engine produced 0.37% more power than BD20 engine superior to better power than BD20 engine. Less exhaust gases of CO2, CO, NOx and total hydrocarbon （THC） were produced from animal fats biodiesel than light oil, which confirmed that biodiesel is environmental friendly fuel. For fuel adoptability in the tractor, biodiesel engine tractor showed its fuel competitiveness comparing with light oil for tractor works in the paddy field.

关键词： Biodiesel animal-fats diesel engine tractor performance exhaust gases particulate matters.

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