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Doped graphene/carbon black hybrid catalyst giving enhanced oxygen reduction reaction activity with high resistance to corrosion in proton exchange membrane fuel cells

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Journal of Energy Chemistry 2022年第5期31卷 143-153页

作者： Zhaoqi Ji Jianuo Chen maría pérez-page Zunmin Guo Ziyu Zhao Rongsheng Cai Maxwell T.p.Rigby Sarah J.Haigh Stuart M.Holmes School of Automotive Engineering Harbin Institute of TechnologyWeihai264209ShandongChina Department of Chemical Engineering and Analytical Science The University of ManchesterManchester M139PLUK Department of Materials The University of ManchesterManchester M139PLUK

Nitrogen doping of the carbon is an important method to improve the performance and durability of catalysts for proton exchange membrane fuel cells by platinum–nitrogen and carbon–nitrogen bonds. This study shows that p-phenyl groups and graphitic N acting bridges linking platinum and the graphene/carbon black(the ratio graphene/carbon black = 2/3) hybrid support materials achieved the average size of platinum nanoparticles with(4.88 ± 1.79) nm. It improved the performance of the lower-temperature hydrogen fuel cell up to 0.934 W cm^(-2) at 0.60 V, which is 1.55 times greater than that of commercial pt/C. Doping also enhanced the interaction between pt and the support materials, and the resistance to corrosion, thus improving the durability of the low-temperature hydrogen fuel cell with a much lower decay of 10 mV at 0.80 A cm^(-2) after 30 k cycles of an in-situ accelerated stress test of catalyst degradation than that of 92 mV in pt/C, which achieves the target of Department of Energy(pt/Nr EGO_(2)-CB_(3) remains 78% of initial power density at 1.5 A cm^(-2) after 5 k cycles of in-situ accelerated stress test of carbon corrosion, which is more stable than the power density of commercial pt/C, keeping only 54% after accelerated stress test.

关键词： Nitrogen doped graphene Low-temperature hydrogen fuel cell Catalyst degradation Carbon corrosion

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Development of NK cell-based cancer immunotherapies through receptor engineering

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Cellular & Molecular Immunology 2024年第4期21卷 315-331页

作者： Audrey page Nicolas Chuvin Jenny Valladeau-Guilemond Stéphane Depil Centre de Recherche en Cancérologie de Lyon UMR INSERM U1052 CNRS 5286Centre Léon BérardLyonFrance ErVimmune LyonFrance Centre Léon Bérard LyonFrance UniversitéClaude Bernard Lyon 1 LyonFrance

Natural killer(NK)cell-based immunotherapies are attracting increasing interest in the field of cancer *** clinical trials have shown promising outcomes,alongside satisfactory product efficacy and *** developments have greatly increased the therapeutic potential of NK cells by endowing them with enhanced recognition and cytotoxic *** review focuses on surface receptor engineering in NK cell therapy and discusses its impact,challenges,and future *** approaches are based on engineering with chimeric antigen receptors to allow NK cells to target specific tumor antigens independent of human leukocyte antigen *** approach has increased the precision and potency of NK-mediated recognition and elimination of cancer *** addition,engineering NK cells with T-cell receptors also mediates the recognition of intracellular epitopes,which broadens the range of target *** tumor peptide recognition by NK cells has also been improved by optimizing immunoglobulin constant fragment receptor expression and ***,engineered NK cells have an improved ability to recognize and destroy target cells coated with specific antibodies,thereby increasing their antibodydependent cellular *** ability of NK cell receptor engineering to promote the expansion,persistence,and infiltration of transferred cells in the tumor microenvironment has also been ***-based strategies for sustained NK cell functionality within the tumor environment have also been discussed,and these strategies providing perspectives to counteract tumor-induced ***,receptor engineering has led to significant advances in NK cell-based cancer *** technical challenges are addressed,these innovative treatments will likely reshape cancer immunotherapy.

关键词： NK cells Cell therapy Receptor engineering CAR

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Silicon-photonics-enabled chip-based 3D printer

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Light(Science & Applications) 2024年第7期13卷 1320-1330页

作者： Sabrina Corsetti Milica Notaros Tal Sneh Alex Stafford Zachariah A.page Jelena Notaros Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMA 02139USA Department of Chemistry The University of Texas at AustinAustinTX 78712USA

Imagine if it were possible to create 3D objects in the palm of your hand within seconds using only a single photonic *** 3D printing has revolutionized the way we create in nearly every aspect of modern society,current 3D printers rely on large and complex mechanical systems to enable layer-by-layer addition of *** limits print speed,resolution,portability,form factor,and material *** there have been recent efforts in developing novel photocuring-based 3D printers that utilize light to transform matter from liquid resins to solid objects using advanced methods,they remain reliant on bulky and complex mechanical *** address these limitations,we combine the fields of silicon photonics and photochemistry to propose the first chip-based 3D *** proposed system consists of only a single millimeter-scale photonic chip without any moving parts that emits reconfigurable visible-light holograms up into a simple stationary resin well to enable non-mechanical 3D ***,we experimentally demonstrate a stereolithography-inspired proof-of-concept version of the chip-based 3D printer using a visible-light beam-steering integrated optical phased array and visible-light-curable resin,showing 3D printing using a chip-based system for the first *** work demonstrates the first steps towards a highlycompact,portable,and low-cost solution for the next generation of 3D printers.

关键词： printer printing visible

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非凡与平凡现代科技可救人一命,也可料理餐食

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空中英语教室（高级版．彭蒙惠英语） 2024年第7期 14-16,40-42页

作者： page DESIGN BY VICKY TSUNG 不详

开创性的新生儿部分心脏移植手术2022年,杜克健康的外科医生们成功地为一名新生儿实施了全世界首例部分心脏移植手术,创造了历史。医生认为,这台历时8小时的开创性手术——将捐赠者心脏的活体动脉与瓣膜缝合于一名新生儿的心脏中——可... 详细信息

开创性的新生儿部分心脏移植手术2022年,杜克健康的外科医生们成功地为一名新生儿实施了全世界首例部分心脏移植手术,创造了历史。医生认为,这台历时8小时的开创性手术——将捐赠者心脏的活体动脉与瓣膜缝合于一名新生儿的心脏中——可以开创心脏外科手术的新领域,使年轻患者在日后的人生当中免于接受多次高风险的手术。

关键词：心脏移植手术心脏外科手术捐赠者年轻患者新生儿外科医生现代科技

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乐高如何培养客户忠诚度

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空中英语教室（高级版．彭蒙惠英语） 2024年第4期 32-33,48页

作者： Jason Aten VICKY TSUNG(page DESIGN) 不详

乐高出现在我们身边已经91年了,而其中的大部分时间,它都是全世界最热门的玩具之一。它也是目前营收额最高的玩具制造商,并且建立了堪称全世界忠诚度最高的粉丝群。顺带一提,那些粉丝可不只有儿童,数以百万计充满热情的成年人仍旧喜爱... 详细信息

乐高出现在我们身边已经91年了,而其中的大部分时间,它都是全世界最热门的玩具之一。它也是目前营收额最高的玩具制造商,并且建立了堪称全世界忠诚度最高的粉丝群。顺带一提,那些粉丝可不只有儿童,数以百万计充满热情的成年人仍旧喜爱用乐高积木建造作品。在你可能接触到的所有品牌当中,乐高也许拥有最忠诚的粉丝。

关键词：客户忠诚度粉丝玩具制造商成年人

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从空中发现疾病

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空中英语教室（高级版．彭蒙惠英语） 2024年第4期 14-15,41,42页

作者： Grace Toohey OLIVE CHU(page DESIGN) 不详

美国宇航局的植物早期疾病检测技术具有重大潜在效益,新研究发现,美国宇航局的尖端影像技术能够检测-种植物病毒的早期迹象。这种病毒如果没有及时处理,往往会为酿酒厂与葡萄种植者带来严重损失。这项突破对于葡萄酒与葡萄产业而言是好... 详细信息

美国宇航局的植物早期疾病检测技术具有重大潜在效益,新研究发现,美国宇航局的尖端影像技术能够检测-种植物病毒的早期迹象。这种病毒如果没有及时处理,往往会为酿酒厂与葡萄种植者带来严重损失。这项突破对于葡萄酒与葡萄产业而言是好消息一此产业每年因为这种摧毁作物的疾病而损失数十亿美元一一同时,它也有助于全球农业的整体发展。

关键词：植物病毒葡萄种植疾病检测美国宇航局葡萄产业影像技术潜在效益葡萄酒

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你就是专家

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空中英语教室（高级版．彭蒙惠英语） 2024年第4期 36-37,50页

作者： Emma Fox OLIVE CHU(page DESIGN) 不详

许多类型的专业人士选择在社交媒体上聚焦他们的职业,有的是为了引起人们对其职业的兴趣、更正错误观念、吸引客户、赚取额外收入,有的只是为了好玩。观众也乐于关注他们。你是否想要迈出那一步来成为线上专家?你想不想和自己领域里的... 详细信息

许多类型的专业人士选择在社交媒体上聚焦他们的职业,有的是为了引起人们对其职业的兴趣、更正错误观念、吸引客户、赚取额外收入,有的只是为了好玩。观众也乐于关注他们。你是否想要迈出那一步来成为线上专家?你想不想和自己领域里的其他专业人士产生联结,并和群众分享资源?下面是一些决窍,告诉你如何利用自己在工作上已经建立的专长来打造个人品牌。

关键词：社交媒体个人品牌专业人士额外收入兴趣更正错误专家职业

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Effect of Ultraviolet Radiation on Hsp70 protein Expression in HaCaT Cells

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World Journal of Nuclear Science and Technology 2024年第1期14卷 59-71页

作者： Sergio Hugo Sánchez Rodríguez Jesús Rodríguez Vergil Manuel Venancio Muñoz Juárez Kevin Said Ramírez Dávila Luis martín García Ortiz Germán Flores Cortés Luz Elena Vidales Rodríguez Jesús Adrián López David Alejandro García López Laboratorio de Biología Celular y Neurobiología Unidad Académica de Ciencias Biológicas Universidad Autónoma de Zacatecas Zacatecas México Laboatorio de Bacterias y Hongos Filamentosos Unidad Académica de Ciencias Biológicas Universidad Autónoma de Zacatecas Zacatecas México Laboratorio de MicroRNAs Unidad Académica de Ciencias Biológicas Universidad Autónoma de Zacatecas Zacatecas México

Ultraviolet radiation by its wavelength is divided into: UVA, UVB and UVC. Only UVA and UVB manage to penetrate the ozone layer, but due to anthropological activities, all of them are capable of interacting with humans to a greater or lesser extent, and can generate adverse effects such as cellular stress when interacting with intra-and extracellular biomolecules. The skin is the first organ in contact with UV radiation, and the stress it generates can be analyzed by the expression of a bioindicator of cellular damage such as Hsp70. Therefore, the objective of the project was: to determine the effect of UVA, UVB and UVC radiation on HaCaT epithelial cells, by analyzing the expression of Hsp70. Materials and methods: HaCaT cells were cultured in vitro, which were irradiated with UVA, UVB and UVC light at different doses, to subsequently determine the degree of Hsp70 expression by Immunodetection by page-SDS and Western Blot. Results: Basal expression of Hsp70 was observed in no irradiated HaCaT cells. When HaCaT cells were irradiated with UVA, UVB, UVC, an increase in this Hsp70 protein was observed. With UVA, a higher degree of expression was observed at a time of 30 minutes of irradiation. With UVB the highest expression shifted to a time of 20 minutes. With UVC, overexpression was observed after 10 minutes. Conclusion: UV radiation generates cellular stress on HaCaT cells, evaluated by the stress bioindicator Hsp70. According to the wavelength of UV radiation, those that have a shorter wavelength have a greater potential for cellular damage, such as UVC.

关键词： Ultraviolet A Light (UVA) Ultraviolet B Light (UVB) Ultraviolet C Light (UVC) Heat Shock protein 70 (Hsp70) HaCaT

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Synthesis of phosphonated graphene oxide by electrochemical exfoliation to enhance the performance and durability of high-temperature proton exchange membrane fuel cells

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Journal of Energy Chemistry 2023年第1期76卷 448-458,I0011页

作者： Jianuo Chen Zunmin Guo maria perez-page Yifeng Jia Ziyu Zhao Stuart M.Holmes Department of Chemical Engineering and Analytical Science University of ManchesterOxford RoadManchester M139PLUnited Kingdom Chemistry Research Laboratory Department of ChemistryUniversity of Oxford12 Mansfield RoadOxford OX13TAUnited Kingdom

The doping of functionalized graphene oxide(GO)in the membranes becomes a promising method for improving the performance of high-temperature proton exchange membrane fuel cells(HT-pEMFC).phosphonated graphene oxide(pGO)with a p/O ratio of 8.5%was quickly synthesised by one-step electrochemical exfoliation based on a three-dimensiaonal(3D)printed reactor and natural graphite *** with the GO prepared by the two-step electrochemical exfoliation method,the pGO synthesized by the one-step electrochemical exfoliation can better improve the performance of the membrane-electrode-assembly(MEA)based on the polybenzimidazole(pBI)membrane in the *** doping of 1.5 wt%GO synthesised by electrochemical exfoliation with the 2-step method or reactor method in pBI increased the peak power density by 17.4%or 35.4%compared to MEA based on pure pBI membrane at 150℃,*** addition,the doping of pGO in pBI improves its durability under accelerated stress test(AST).

关键词： Electrochemical exfoliation phosphonated graphene oxide High-temperature fuel cells

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Graphene/carbon structured catalyst layer to enhance the performance and durability of the high-temperature proton exchange membrane fuel cells

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Journal of Energy Chemistry 2022年第12期75卷 399-407,I0011页

作者： Zhaoqi Ji Jianuo Chen Zunmin Guo Ziyu Zhao Rongsheng Cai Maxwell T.p.Rigby Sarah J.Haigh maria perez-page Yitao Shen Stuart M.Holmes School of Automotive Engineering Harbin Institute of Technology(Weihai)Weihai 264209ShandongChina Department of Chemical Engineering The University of ManchesterManchester M139PLUK Department of Materials The University of ManchesterManchester M139PLUK

In this study,nitrogen doped electrochemically exfoliated reduced graphene oxide and carbon black supported platinum(pt/Nr EGO_(2)-CB_(3))has been prepared to enhance the performance and durability of hightemperature pEMFCs with lower pt *** the one hand,pt/Nr EGO_(2)-CB_(3)with the strong interaction between the pt and nitrogen(N)prevent agglomeration of pt particles and pt particles is 5.46±1.46 nm,which is smaller than that of 6.78±1.34 nm in pt/***,ECSA of pt/Nr EGO_(2)-CB_(3)decrease 13.65%after AST,which is much lower than that of 97.99%in pt/*** the other hand,the Nr EGO flakes in MEAac act as a barrier to mitigate phosphoric acid redistribution,which improves the formation of triple-phase boundaries(TpBs)and gives stable operation of the MEAacwith a lower decay rate of 0.02 mV h^(-1)within100 *** steady-state operation,the maximum power density of pt/Nr EGO_(2)-CB_(3)(0.411 W cm^(-2))is three times higher than that of conventional pt/C(0.134 W cm^(-2))in high-temperature *** AST,the mass transfer resistance of pt/Nr EGO_(2)-CB_(3)electrode(0.560Ωcm^(2))is lower than that in pt/C(0.728Ωcm^(2)).

关键词： High-temperature proton exchange membrane fuel cell phosphoric acid loss pt catalyst degradation Accelerated stress test Durability

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