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Pulsed dynamic electrolysis enhanced PEMWE hydrogen production:Revealing the effects of pulsed electric fields on protons mass transport and hydrogen bubble escape

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Journal of Energy Chemistry 2025年第1期100卷 201-214页

作者： Xuewei Zhang Wei Zhou Yuming Huang Liang Xie Tonghui Li Huimin Kang Lijie Wang Yang Yu Yani Ding Junfeng Li Jiaxiang Chen Miaoting Sun Shuo Cheng Xiaoxiao Meng Jihui Gao Guangbo zhao School of Energy Science and Engineering Harbin Institute of Technology China Datang Technology Innovation Co. Ltd

The transition of hydrogen sourcing from carbon-intensive to water-based methodologies is underway,with renewable energy-powered proton exchange membrane water electrolysis （PEMWE） emerging as the preeminent pathway for hydrogen *** remarkable advancements in this field,confronting the sluggish electrochemical kinetics and inherent high-energy consumption arising from deteriorated mass transport within PEMWE systems remains a formidable *** impediment stems primarily from the hindered protons mass transfer and the untimely hydrogen bubbles *** address these challenges,we harness the inherent variability of electrical energy and introduce an innovative pulsed dynamic water electrolysis *** to constant voltage electrolysis (hydrogen production rate:51.6 m L h-1,energy consumption:5.37 kWh Nm-3H2),this strategy (hydrogen production rate:66 m L h-1,energy consumption:3.83 kWh Nm-3H2) increases the hydrogen production rate by approximately 27%and reduces the energy consumption by about 28%.Furthermore,we demonstrate the practicality of this system by integrating it with an off-grid photovoltaic （PV） system designed for outdoor operation,successfully driving a hydrogen production current of up to 500 mA under an average voltage of approximately 2 *** combined results of in-situ characterization and finite element analysis reveal the performance enhancement mechanism:pulsed dynamic electrolysis （PDE） dramatically accelerates the enrichment of protons at the electrode/solution interface and facilitates the release of bubbles on the electrode *** such,PDE-enhanced PEMWE represents a synergistic advancement,concurrently enhancing both the hydrogen generation reaction and associated transport *** promising technology not only redefines the landscape of electrolysis-based hydrogen production but also holds immense potential for broadening its application across a diverse spectrum of electrocatalytic endeavors.

关键词： Electrolysis

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Research on Water-Taking Characteristics of Huanghua Power Plant Reach

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China Ocean Engineering 1998年第1期13卷 99-112页

作者： Tong, ZS Ying, xy Qian, BF Nanjing Hydraul Res Inst Dept Hydraul Engn Nanjing 210029 Peoples R China

In this paper the water-taking characteristics of the first,the second and the third stage of theHuanghua Power Plant are studied by numerical model and physical *** results show that the pres-ent inlet channel only satisfies the supply need of the first stage of the power *** the riverbed of the in-let reach is properly dredged,the need of water supply for the third stage of the power plant could be met.

关键词： physical model numerical simulation cooling water tidal river

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直线导轨式隔震装置的设计与性能研究

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地震工程学报 2025年第1期47卷 50-59页

作者：赵守江柏文故宫博物院北京100009 中国地震局工程力学研究所地震工程与工程振动重点实验室黑龙江哈尔滨150080 地震灾害防治应急管理部重点实验室黑龙江哈尔滨150080

为确保馆藏文物的地震安全,研制出一款新型直线导轨式隔震装置,采用振动台试验和理论分析方法对其有效性进行验证。首先阐述装置的构造和工作机理,推导出装置的刚度和黏滞阻尼系数表达式;然后制作原型样机并通过振动台试验验证其隔震有... 详细信息

为确保馆藏文物的地震安全,研制出一款新型直线导轨式隔震装置,采用振动台试验和理论分析方法对其有效性进行验证。首先阐述装置的构造和工作机理,推导出装置的刚度和黏滞阻尼系数表达式;然后制作原型样机并通过振动台试验验证其隔震有效性;最后依据所测基本参数,建立装置单向水平隔震系统的动力方程并开展数值分析。结果表明,该隔震装置结构简单、性能可靠,具有摩擦系数低、起滑加速度阈值小,以及刚度和阻尼灵活可调的特点;它可以在满足位移限值的情况下达到设定隔震目标,且自复位效能力强、残余位移小。装置理论分析结果与试验实测动力响应吻合程度高,且吻合程度随地震动峰值的提高而进一步增强。该理论分析方法可以用于指导装置参数设计和隔震性能评估。

关键词：文物隔震直线导轨式振动台试验数值模拟

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Electrochemical characteristics of poly(ophenylendiamine) film electrodes in phosphatic solution

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Chinese Journal of Chemistry 1997年第4期15卷 343-352页

作者： Ye, BX Zhang, WM Zhou, xy WUHAN UNIV DEPT CHEMWUHAN 430072PEOPLES R CHINA

The electrochemical characteristics of poly(o-phenylendiamine) (POPD) film modified electrodes have been investigated using different electrochemical techniques. The main interest is focused on the effect of potential and film thickness on the electrode process. Good agreement has been found for the apparent diffusion coefficient estimated by chronocoulometry and impedance spectroscopy. The charge transfer process within POPD films is diffusion processes at negative and positive overpotentials and electron hopping mechanism at formal potential. The POPD film conductivity of the oxidized state is better than that of the reduced state. For all electrode processes, the H+ may penetrate the film/electrolyte interface and take part in charge transfer or protonation-deprotonation of phenazine rings.

关键词： electropolymerization o-phenylendiamine electrochemistry

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Human antibodies from a single-chain Fv fusion phage library

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Chinese Science Bulletin 1997年第15期42卷 1300-1303页

作者： Yan, xy Tian, B Institute of Microbiology Chinese Academy of Sciences Beijing China

THAT the bacteriophages can display human antibody fragments on their surfaces equivalent tothe mammalian immune repertoire provides a new and powerful means of making human anti-bodies for immunotherapy. This technique combines production, selection and affinity matura-tion in numerous imaginative ways. The phage antibody display systems have an advantageover the conventional hybridoma technique in the generation of human antibody and the development of an affinity maturation process that mimics the immune system. Since the first

关键词： human scFv phage antibody library specificity.

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技术鹰派、国家安全与美国对华战略竞争

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国际安全研究 2025年第1期43卷 115-132,158,159页

作者：赵明昊复旦大学美国研究中心复旦大学一带一路及全球治理研究院上海220433

在新一轮科技革命和地缘政治对抗相互叠加的背景下,技术因素对国家间关系尤其是大国关系的塑造作用越发突出,科技界与国家安全战略之间的联系日益紧密。近年来,美国不断强化对华“科技冷战”,与美国在经济、军事、意识形态、全球治理等... 详细信息

在新一轮科技革命和地缘政治对抗相互叠加的背景下,技术因素对国家间关系尤其是大国关系的塑造作用越发突出,科技界与国家安全战略之间的联系日益紧密。近年来,美国不断强化对华“科技冷战”,与美国在经济、军事、意识形态、全球治理等方面的对华施压相互关联。美国科技企业、风险投资机构等社会性力量和美国国家安全部门之间的沟通协作日益密切,涵盖商界、政界和学界精英的技术鹰派势力逐步成形。技术鹰派认为,美国须牢固捍卫自身技术领导地位,推进对华技术“脱钩”,甚至设法令中国的技术水平倒退,进而以强大的美国技术实力实现对华“竞而胜之”的目标。美国政府着眼对华战略竞争,加快推动构建国家安全创新网络,国防部、国务院、中央情报局等机构与高科技企业的合作更趋深化,美国创新生态的国家安全导向更为突出。加大对华科技竞争已经成为美国共和党和民主党的共识。考虑到美国科技界精英对特朗普的支持,以及副总统万斯、特朗普家族等与硅谷之间错综复杂的社会关系网络,特朗普第二任期的对华科技施压力度或将增强,技术鹰派对中美关系的影响力将更为突出。

关键词：技术鹰派国家安全中美关系技术—安全复合体国家创新生态

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Crystal Structure of 1,1-Dichloro-3-Dichloromethyl-1a-3-Dipenyl-1a,2,3,4-Tetrahydro-1 H-Azirino〔1,2-a〕〔1,5〕benzodiazepine(C_(23)H_(18)Cl_4N_2)

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Chinese Journal of Structural Chemistry 1999年第2期18卷 79-83页

作者： Xu, JX Zhang, xy Jin, S Beijing Univ Coll Chem & Mol Engn Beijing 100871 Peoples R China

The crystal structure of the title compound, 1,1 dichloro 3 dichloro 3 dichloromethyl 1a,3 diphenyl 1a,2,3,4 tetrahydro 1H azirino 1,2 a 1,5 benzodiazepine (C 23 H 18 Cl 4N 2, M r =4... 详细信息

The crystal structure of the title compound, 1,1 dichloro 3 dichloro 3 dichloromethyl 1a,3 diphenyl 1a,2,3,4 tetrahydro 1H azirino 1,2 a 1,5 benzodiazepine (C 23 H 18 Cl 4N 2, M r =464.22) was crystallized in triclinic, space group P 1, with cell dimensions a=9.621(7), b=9.694(9), c=12.669(6) , α=107.99(5)°, β=101.42(5)°, γ=69.94(6)°, V=1050.2(4)  3, Z=2, D c =1.468 g/cm 3 , Cu Kα(λ=1.5418 ). F(000)=1816, μ =2.44 mm -1 . The structure was solved by direct methods and refined by full matrix least squares method, and the final crystallographic discrepancy factor is 0.063 for 2555 observed reflections. The molecular backbone is a tricyclic system with the central seven membered 1,5 diazepine ring in twisted boat like conformation and cis fused to both aziridine ring and benzene ring.

关键词： crystal structure azirino 1 2 a 1 5 benzodiazepine 1 5 benzodiazepine

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Negative PO3-implanted bionic ion transport channels for promoting Li-S battery

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Science China Chemistry 2025年

作者： Wenhuan Huang Shun Wang Xuehan Hou Yanan Zhang Xingxing Zhang Yaoxiao zhao Xilang Jin Huabin Zhang Fei Wang Jian Zhang Key Laboratory of Chemical Additives for China National Light Industry College of Chemistry and Chemical EngineeringShaanxi University of Science and Technology School of Materials and Chemical Engineering Xi'an Technological University Chemistry Program Physical Science and Engineering Division King Abdullah University of Science and Technology State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Lithium-sulfur （Li-S） battery,as a promising next-generation high-energy-density battery,suffers from lithium polysulfides（LPSs） shuttle and Li dendrites *** crystalline framework-based membranes as separator can effectively absorb and restrain LPSs but without precise structural design principal exploration and mechanism ***,bio-inspired 1D oriented lithium-ion transport channels with molecular negatively charged PO3（-1） have been developed in hybrid tetrazole frameworks for promoting the transmission of Li+*** theoretical calculations and in situ spectroscopy demonstrated the higher binding energy and inhibited diffusion of LPSs in *** assembled PP@PO3Janus separator in Li-S coin cell delivered a high initial capacity of 1410.9 mAh g-1at 0.1 C and a low attenuation rate of 0.038%per cycle over 500 cycles at 5 ***,the high capacities of 862,542 and 409 mAh g-1based on high-sulfur-loading cathodes of 2.6,3.8 and 5.0 mg cm-2at0.5 C were achieved,***,the punch battery of PO3@PP separator with S-cathode of 1.2 mg cm-2has been developed for demonstrating its potentials commercial application,which displays impressive capacity of 873.4 mAh g-1with the retention of～78.9%over 50 cycles.

关键词：

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Thermodynamic Analyses of Strain-induced Martensite Transformation in Fe-7Mn-1.2C Alloy

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Journal of Materials Science & Technology 2000年第4期16卷 449-451页

作者： Xie, JP Zhu, YM Wang, xy Luoyang Inst Technol Grad Div Luoyang 471039 Peoples R China

The M-s temperature, Delta G(gamma-->alpha), Delta G(gamma-->M) and mechanical energy under a non-severe impact loading in a medium manganese steel (Fe-7Mn-1.2C) have been calculated by means of Xu's Fe-X-C model. The relation between the yield strength of austenite and the driving force for martensite transformation has been established. It is proved that the martensite transformation can take place in a medium manganese steel (Fe-7Mn-1.2C alloy) under a non-severe impact loading.

关键词： martensite transformation manganese steel impact loading the driving force mechanical energy Ms temperature strength of

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Spline wavelet multifiltering analysis

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Chinese Science Bulletin 1997年第8期42卷 640-644页

作者： Zou, xy Mo, JY Department of Chemistry Zhongshan University Guangzhou China

IT is difficult to decrease the detection limit,to enhance the clarity of the waveform and to ma-nipulate the signal further in electroanalytical chemistry on account of the serious environmen-

关键词： spline wavelet basis multifiltering analysis step voltammetry.

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