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Atomically dispersed Mn-Nx catalysts derived from Mn-hexamine coordination frameworks for oxygen reduction reaction

Carbon Energy 2024年第5期6卷 114-126页

作者： Guoyu Zhong Liuyong Zou Xiao Chi Zhen Meng Zehong Chen Tingzhen Li yongfa huang Xiaobo Fu Wenbo Liao Shaona Zheng Yongjun Xu Feng Peng Xinwen Peng Guangdong Provincial Key Laboratory of Distributed Energy Systems School of Chemical Engineering and Energy TechnologyDongguan University of TechnologyDongguanChina State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhouChina Department of Chemistry Centre for Advanced 2D Materials(CA2DM)National University of SingaporeSingaporeSingapore School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhouChina

Metal-organic frameworks recently have been burgeoning and used as precursors to obtain various metal-nitrogen-carbon catalysts for oxygen reduction reaction(ORR).Although rarely studied,Mn-N-C is a promising catalyst for ORR due to its weak Fenton reaction activity and strong graphitization catalysis.Here,we developed a facile strategy for anchoring the atomically dispersed nitrogen-coordinated single Mn sites on carbon nanosheets(MnNCS)from an Mn-hexamine coordination framework.The atomically dispersed Mn-N4 sites were dispersed on ultrathin carbon nanosheets with a hierarchically porous structure.The optimized MnNCS displayed an excellent ORR performance in half-cells(0.89 V vs.reversible hydrogen electrode(RHE)in base and 0.76 V vs.RHE in acid in half-wave potential)and Zn-air batteries(233 mW cm^(−2)in peak power density),along with significantly enhanced stability.Density functional theory calculations further corroborated that the Mn-N4-C1_(2)site has favorable adsorption of*OH as the rate-determining step.These findings demonstrate that the metal-hexamine coordination framework can be used as a model system for the rational design of highly active atomic metal catalysts for energy applications.

关键词： carbon nanosheets electrocatalyst metal-organic frameworks Mn-N4 oxygen reduction reaction Zn-air batteries

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Cellulose nanofiber-derived carbon aerogel for advanced room-temperature sodium–sulfur batteries

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Carbon Energy 2023年第1期5卷 1-15页

作者： Wu Yang Wang Yang Ren Zou yongfa huang Haihong Lai Zehong Chen Xinwen Peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhouChina

Room-temperature sodium–sulfur(RT/Na–S)batteries are regarded as promising large-scale stationary energy storage systems owing to their high energy density and low cost as well as the earth-abundant reserves of sodium and sulfur.However,the diffusion of polysulfides and sluggish kinetics of conversion reactions are still major challenges for their application.Herein,we developed a powerful and functional separator to inhibit the shuttle effect by coating a lightweight three-dimensional cellulose nanofiber-derived carbon aerogel on a glass fiber separator(denoted NSCA@GF).The hierarchical porous structures,favorable electronic conductivity,and three-dimensional interconnected network of N,S-codoped carbon aerogel endow a multifunctional separator with strong polysulfide anchoring capability and fast reaction kinetics of polysulfide conversion,which can act as the barrier layer and an expanded current collector to increase sulfur utilization.Moreover,the hetero-doped N/S sites are believed to strengthen polysulfide anchoring capability via chemisorption and accelerate the redox kinetics of polysulfide conversion,which is confirmed from experimental and theoretical results.As a result,the assembled Na–S coin cells with the NSCA@GF separator showed a high reversible capacity(788.8 mAh g^(−1) at 0.1 C after 100 cycles)and superior cycling stability(only 0.059%capacity decay per cycle over 1000 cycles at 1 C),thereby demonstrating the significant potential for application in high-performance RT/Na–S batteries.

关键词： carbon aerogel cellulose nanofiber N,S codoping redox kinetics sodium–sulfur batteries

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Single-cell transcriptional profile of ACE2 in healthy and failing human hearts

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Science China(Life Sciences) 2021年第4期64卷 652-655页

作者： Yitian Zhou yongfa huang Xiaomin Song Xiaoxiao Guo Junling Pang Jing Wang Shuyang Zhang Chen Wang State Key Laboratory of Medical Molecular Biology.Institute of Basic Medical Sciences Chinese Academy of Medical SciencesDeparment of Pathophysiology.Peking Union Medical CollegeBejing 100730China Deparment of Cardiology Peking Union Medlical College HospialPeking Union Medical College and Chinese Academy of Medical SciencesBejing 100730China Slate Key Laboratory of Medical Molecular Biology Institute of Basic Medical SciencesChinese Academy of Medical SciencesDepartment of PlhysiologPeking Union Medical CollegeBeijing 100730China

Dear Editor,The coronavirus disease 2019(COVID-19)pandemic,which is caused by SARS-Co V-2,has gained serious attention from medical practitioners around the world in the past few months.Approximately 20%of critically ill COVID-19 patients were reported to have suffered myocardial injury.The specific mechanism of this pathology requires further investigation(Yang et al.,2020).

关键词： ACE2 al. pathology

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SARS-CoV-2 leads to myocardial injury in rhesus macaque

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Signal Transduction and Targeted Therapy 2021年第10期6卷 2957-2959页

作者： Yufan Feng Xiaomin Song yongfa huang Wei Deng Man Li Xiaoxiao Guo Chuan Qin Wei-Min Tong Jiangning Liu Jing Wang Institute of Basic Medical Sciences Chinese Academy of Medical SciencesSchool of Basic Medicine Peking Union Medical CollegeBeijingChina Department of Cardiology Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical SciencesBeijingChina NHC Key Laboratory of Human Disease Comparative Medicine Beijing Key Laboratory for Animal Models of Emerging and Remerging Infectious DiseasesInstitute of Laboratory Animal ScienceChinese Academy of Medical Sciences and Comparative Medicine CenterPeking Union Medical CollegeBeijingChina Department of Pathology Beijing Ditan HospitalCapital Medical UniversityBeijingChina Department of Pathology Institute of Basic Medical SciencesChinese Academy of Medical Sciences and Peking Union Medical CollegeMolecular Pathology Research CenterChinese Academy of Medical SciencesBeijingChina

Dear Editor,Coronavirus disease 2019(COVID-19)is caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)infection,which induces multiple cardiovascular complications including acute myocardial injury resulting from acute coronary syndrome,myocarditis,stress-cardiomyopathy,arrhythmias,cardiogenic shock,and cardiac arrest.The incidence of myocardial injury in COVID-19 patients was up to 20%or higher in the subpopulation with existing cardiovascular diseases,accounting for 69.4%of mortality.1 Although the presence of angiotensin-converting enzyme 2(ACE2)in cardiomyocytes could result in viral myocarditis in COVID-19 patients,the cardiopathology involved in COVID-19 is still unclear.

关键词： acute cardiovascular myocardial

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Recent progress and future perspectives of flexible metal‐air batteries

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SmartMat 2021年第4期2卷 519-553页

作者： Tingzhen Li Xinwen Peng Peng Cui Ge Shi Wu Yang Zehong Chen yongfa huang Yongkang Chen Jinyuan Peng Ren Zou Xiaoyan Zeng Jian Yu Jianyun Gan Zhiyuan Mu Yuling Chen Jiaming Zeng Juan Liu Yunyi Yang Yujia Wei Jun Lu State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhouChina Chemical Sciences and Engineering Division Argonne National LaboratoryLemontIllinoisUSA

With the rapid development of wearable and intelligent flexible electronic devices(FEDs),the demand for flexible energy storage/conversion devices(ESCDs)has also increased.Rechargeable flexible metal‐air batteries(MABs)are expected to be one of the most ideal ESCDs due to their high theoretical energy density,cost advantage,and strong deformation adaptability.With the improvement of the device design,material assemblies,and manufacturing technology,the research on the electrochemical performance of flexible MABs has made significant progress.However,achieving the high mechanical flexibility,high safety,and wearable comfortability required by FEDs while maintaining the high performance of flexible MABs are still a daunting challenge.In this review,flexible Zn‐air and Li‐air batteries are mainly exemplified to describe the most recent progress and challenges of flexible MABs.We start with an overview of the structure and configuration of the flexible MABs and discuss their impact on battery performance and function.Then it focuses on the research progress of flexible metal anodes,gel polymer electrolytes,and air cathodes.Finally,the main challenges and future research perspectives involving flexible MABs for FEDs are proposed.

关键词： air cathode flexible electronic device flexible metal‐air battery gel polymer electrolytes metal anode

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谈电梯的安全使用与维保人员的素质提升

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中国电梯 2022年第2期33卷 66-68页

作者：黄永发福建太平富邦物业管理有限公司福建泉州362019 泉州市绿色低碳研究院福建泉州362001

电梯的安全运行离不开电梯使用人员合理使用,爱惜电梯设备;也离不开维保人员专业的维护保养工作。因此,对于电梯使用人员,应注意保持电梯的清洁、整洁,做好电梯的防水保护,满足电梯运行环境条件,爱惜电梯设备;对于电梯维保人员,应加强... 详细信息

电梯的安全运行离不开电梯使用人员合理使用,爱惜电梯设备;也离不开维保人员专业的维护保养工作。因此,对于电梯使用人员,应注意保持电梯的清洁、整洁,做好电梯的防水保护,满足电梯运行环境条件,爱惜电梯设备;对于电梯维保人员,应加强技能培训,提升维保质量,同时加强安全生产教育,确保作业安全。

关键词：电梯使用管理维保人员技能培训安全教育

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库岸土质滑坡蠕变作用下悬臂抗滑桩受荷劣化特性研究

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重庆师范大学学报（自然科学版） 2022年第5期39卷 69-77页

作者：罗爽陈洪凯黄永发三峡大学水利与环境学院湖北宜昌443002 枣庄学院城市与建筑工程学院山东枣庄277160 重庆交通大学岩土工程研究所重庆400074

【目的】研究库岸土质滑坡在库水周期性浸泡作用下对悬臂抗滑桩劣化特性的影响。【方法】采用广义Kelvin蠕变模型描述库岸土质滑坡的蠕变作用,将悬臂抗滑桩假定为Winkle弹性地基梁,研究蠕变作用对抗滑桩内力的不利影响。【结果】得到库... 详细信息

【目的】研究库岸土质滑坡在库水周期性浸泡作用下对悬臂抗滑桩劣化特性的影响。【方法】采用广义Kelvin蠕变模型描述库岸土质滑坡的蠕变作用,将悬臂抗滑桩假定为Winkle弹性地基梁,研究蠕变作用对抗滑桩内力的不利影响。【结果】得到库岸土质滑坡体蠕变位移场,构建了库岸土质滑坡抗滑桩蠕变内力计算式。以三峡库区桥头北滑坡为实例,分析表明考虑滑坡体蠕变作用后,悬臂抗滑桩在工程竣工后的前30 d内桩体内力增长速率较快,在100 d后趋于平稳;桩顶位移、滑动面处弯矩、剪力与不考虑滑坡体蠕变时相比分别增大了约0.8倍、1.7倍和0.3倍。【结论】在采用抗滑支挡结构治理库岸土质滑坡时应考虑到由库水周期性浸泡引发的滑坡体蠕变作用,特别是蠕变应力对抗滑支挡结构服役性能有明显的劣化效应。

关键词：悬臂抗滑桩内力变化蠕变应力周期性浸泡库岸土质滑坡

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胶原蛋白对高抗拉锂电铜箔性能的影响

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电镀与涂饰 2022年第1期41卷 47-50页

作者：朱若林代泽宇宋言林毅黄永发刘常升江西铜业集团有限公司江西南昌330096 江西铜业技术研究院有限公司江西南昌330096 江西省江铜耶兹铜箔有限公司江西南昌330096 东北大学辽宁沈阳110819

采用自制镀液循环电解铜箔实验装置制备高抗拉锂电铜箔,研究了胶原蛋白质量浓度对铜箔各项性能的影响。发现电解液中加入胶原蛋白后,铜箔的抗拉强度和表面粗糙度降低,光泽升高,表面变得平整,晶面择优取向由(220)转变为(200)。当胶原蛋... 详细信息

采用自制镀液循环电解铜箔实验装置制备高抗拉锂电铜箔,研究了胶原蛋白质量浓度对铜箔各项性能的影响。发现电解液中加入胶原蛋白后,铜箔的抗拉强度和表面粗糙度降低,光泽升高,表面变得平整,晶面择优取向由(220)转变为(200)。当胶原蛋白的质量浓度为1.0~5.0 mg/L时,铜箔的综合性能最佳,满足抗拉强度大于40.0 kg/mm^(2)的要求。

关键词：电解铜箔电沉积胶原蛋白抗拉强度光泽粗糙度微观结构

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村落信仰语境下客家民间传说的生发机制研究——基于寒信“水府庙传说”的田野考察

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龙岩学院学报 2024年第3期42卷 13-20页

作者：刘永发黄清喜赣南师范大学科技学院江西赣州341000

“水府庙传说”根植于寒信村的村落信仰,在村落信仰的变迁过程中不断丰富,并且反作用于村落信仰的传承与发展。传说与信仰互构共生,共同成为村落传统的重要内容,形成了一套特有的民间传说生发机制。“水府庙传说”生发机制主要表现为:... 详细信息

“水府庙传说”根植于寒信村的村落信仰,在村落信仰的变迁过程中不断丰富,并且反作用于村落信仰的传承与发展。传说与信仰互构共生,共同成为村落传统的重要内容,形成了一套特有的民间传说生发机制。“水府庙传说”生发机制主要表现为:以村庙、村落、记忆为主要生发空间;以祖先与神灵的双重叙事为主要特点,形成双向神化的格局;通过人格和神格的塑造,拉近与民众的距离的同时保持神灵的权威;传说与信仰在相互作用下共同扩布;灵验传说轶事不断进行现代流变,借助传说重塑信仰氛围。

关键词：客家民间传说村落信仰寒信水府庙 “水府庙传说”

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谈建立电梯维保诚信机制的必要性

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中国电梯 2019年第4期30卷 23-24,35页

作者：黄永发福建省远宏物业管理有限公司福建泉州362000

纵观不时出现的电梯安全事故,血淋淋的画面冲击着人们的神经,电梯安全事故带给我们深刻的警醒。电梯安全、电梯维保企业恶性竞争、电梯维保企业的诚信机制建立等问题成为人们关注的热点问题。为避免与减少电梯安全事故的发生,有必要建... 详细信息

纵观不时出现的电梯安全事故,血淋淋的画面冲击着人们的神经,电梯安全事故带给我们深刻的警醒。电梯安全、电梯维保企业恶性竞争、电梯维保企业的诚信机制建立等问题成为人们关注的热点问题。为避免与减少电梯安全事故的发生,有必要建立有效的电梯行业诚信机制,尤其是电梯维保行业的诚信机制,通过诚信机制的建立,从多方位对电梯安全进行预防,避免与减少电梯安全事故的发生。

关键词：恶性竞争更新改造电梯安装诚信机制

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