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Oxygen vacancy promoting artificial atom(RuPd)by d-orbital coupling for efficient water dissociation

Nano Research 2024年第8期17卷 7045-7052页

作者： Ruofan Shen Yanyan liu Shuling liu Shuyan Guan huanhuan Zhang Sehrish Mehdi Saima Ashraf Ting-Hui Xiao Erjun Liang Jianchun Jiang Yongfeng Wang Baojun Li Laboratory of Zhongyuan Light School of PhysicsZhengzhou UniversityZhengzhou 450001China Key Laboratory of Materials Physics Ministry of EducationSchool of PhysicsZhengzhou UniversityZhengzhou 450001China College of Chemistry Zhengzhou UniversityZhengzhou 450001China College of Science Henan Agricultural UniversityZhengzhou 450002China Department of Chemistry Tsinghua UniversityBeijing 100084China National Engineering Lab.for Biomass Chemical Utilization Institute of Chemical Industry of Forest ProductsCAFNanjing 210042China Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing 100871China

Rational design of highly active catalysts for breaking hydrogen-oxygen bonds is of great significance in energy chemical reactions involving ***,an efficient strategy for the artificial atom(RuPd)established by d-orbital coupling and adjusted by oxygen vacancy(VO)is verified for water *** an experimental verification,the turnover frequency of RuPd-TiO_(2)-VO(RuPdTVO)catalyst in ammonia borane hydrolysis reaches up to 2750 min^(−1)(26,190 min−1 based on metal dispersion)in the absence of alkali,exceeding the highest active catalysts(Rh-based catalysts).The d-orbital coupling effect between Ru and Pd simulates the outer electronic structure of *** transfer from VO to(RuPd)constructs an electron-rich state of active sites that further enhances the ability of the artificial atom to dissociate *** work provides an effective electronic regulation strategy from VO and artificial atom constructed by d-orbital coupling effect for efficient water dissociation.

关键词： ammonia borane hydrolysis d-orbital coupling oxygen vacancy artificial atom water dissociation

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The IDD Transcription Factors:Their Functions in Plant Development and Environmental Response

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Phyton-International Journal of Experimental Botany 2024年第1期93卷 63-79页

作者： Jing liu Defeng Shu Zilong Tan Mei Ma huanhuan Yang Ning Guo Shipeng Li Dayong Cui School of Life Sciences Qilu Normal UniversityJinan250200China School of Life Sciences Shandong Normal UniversityJinan250014China

INDETERMINATE-DOMAIN proteins(IDDs)are a plant-specific transcription factor family characterized by a conserved ID domain with four zinc finger *** studies have demonstrated that IDDs coordinate a diversity of physiological processes and functions in plant growth and development,including floral transition,plant architecture,seed and root development,and hormone *** this review,we especially summarized the latest knowledge on the functions and working models of IDD members in Arabidopsis,rice,and maize,particularly focusing on their role in the regulatory network of biotic and abiotic environmental responses,such as gravity,temperature,water,and *** these mechanisms underlying the function of IDD proteins in these processes is important for improving crop yields by manipulating their ***,the review offers valuable insights into the functions and mechanisms of IDD proteins in plants,providing a foundation for further research and potential applications in agriculture.

关键词： INDETERMINATE DOMAIN flowering time root development shoot gravitropism plant immunity hormonal signaling environmental responses

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Recent development of flat supercontinuum generation in specialty optical fibers

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Opto-Electronic Advances 2019年第2期2卷 1-9页

作者： huanhuan liu Ye Yu Wei Song Qiao Jiang Fufei Pang Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai 200444 China

Supercontinuum (SC) generation has attracted a significant scientific interest in the past decades due to its promising applications covering the fields of metrology, spectroscopy, defense, as well as medical treatments. To date, researchers are devoted to improving the spectral width and flatness of SC generation by using specialty optical fibers. The flatness of the spectrum is of importance because it can improve the accuracy of measurement in practical applications. This paper summarizes the theory of SC, the state of the art of flat SC generation using optical fiber including photonic crystal fibers, soft glass fibers as well as germania-doped fibers, and suggests the future research direction of flat SC light source.

关键词： specialty optical fibers flatness supercontinuum light source nonlinear optics

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Black Phosphorus-Film With Drop-Casting Method for High-Energy Pulse Generation From Q-Switched Er-Doped Fiber Laser

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Photonic Sensors 2019年第3期9卷 239-245页

作者： huanhuan liu Wei SONG Ye YU Qiao JIANG Fufei PANG Tingyun WANG Shanghai University

We have reported high-energy pulse generation from a Q-switched Er-doped fiber laser based on black phosphorus (BP) with a drop-casting method. Poly dimethyl diallyl ammonium (PDDA) is employed to protect BP. A passive Q-switching operation is achieved by using the BP/polyvinyl alcohol (PVA) film as the saturable absorbers (SAs). When the pump power increases from 130.4mW to 378mW, the repetition rate increases from 13.33kHz to 26.6kHz, and the pulse duration decreases from 10.67p,s to 7.11 (is. The maximum pulse energy is 468.03 nJ, to the best of our knowledge, which is the highest pulse energy produced from Q-switched fiber laser based on BP-SA at 1.5 pm. The obtained high-energy pulse demonstrates that BP/PVA film fabricated by such a drop-casting method can provide an ideal SA for high pulse energy generation from fiber lasers, and it has a potential application of remote sensing.

关键词： Fiber laser Q-switched black phosphorus

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Wafer-scale carbon-based CMOS PDK compatible with siliconbased VLSI design flow

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Nano Research 2024年第8期17卷 7557-7566页

作者： Minghui Yin Haitao Xu Yunxia You Ningfei Gao Weihua Zhang Hongwei liu huanhuan Zhou Chen Wang Lian-Mao Peng Zhiqiang Li Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China State Key Lab of Fabrication Technologies for Integrated Circuits Beijing 100029China Beijing Hua Tan Yuan Xin Electronics Technology Co. Ltd.Beijing 101399China Institute of Carbon-based Thin Film Electronics Peking UniversityShanxi 030012China Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics School of ElectronicsPeking UniversityBeijing 100871China

Carbon nanotube field-effect transistors(CNTFETs)are increasingly recognized as a viable option for creating high-performance,low-power,and densely integrated circuits(ICs).Advancements in carbon-based electronics,encompassing materials and device technology,have enabled the fabrication of circuits with over 1000 gates,marking carbon-based integrated circuit design as a burgeoning field of research.A critical challenge in the realm of carbon-based very-large-scale integration(VLSI)is the lack of suitable automated design methodologies and infrastructure *** this study,we present the development of a waferscale 3μm carbon-based complementary metal-oxide-semiconductor(CMOS)process design kit(PDK)(3μm-CNTFETs-PDK)compatible with silicon-based Electronic Design Automation(EDA)tools and VLSI circuit design *** proposed 3μm-CNTFETs-PDK features a contacted gate pitch(CGP)of 21μm,a gate density of 128 gates/mm^(2),and a transistor density of 554 transistors/mm^(2),with an intrinsic gate delay around 134 *** of the 3μm-CNTFETs-PDK was achieved through the successful design and tape-out of 153 standard cells and 333-stage ring oscillator *** the carbon-based PDK and a silicon-based design platform,we successfully implemented a complete 64-bit static random-access memory(SRAM)circuit system for the first time,which exhibited timing,power,and area characteristics of clock@10 kHz,122.1μW,3795μm×2810μ*** research confirms that carbon-based IC design can be compatible with existing EDA tools and silicon-based VLSI design flow,thereby laying the groundwork for future carbon-based VLSI advancements.

关键词： carbon nanotube field-effect transistors(CNTFETs) complementary metal-oxide-semiconductor(CMOS) process design kit(PDK) wafer-scale very-large-scale integration(VLSI)

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Spectrally Flat Supercontinuum Generation in a ZBLAN Fiber Pumped by Erbium-Doped Mode-Locked Fiber Laser

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Photonic Sensors 2019年第4期9卷 302-308页

作者： huanhuan liu Ye YU Wei SONG Qiao JIANG Fufei PANG Tingyun WANG Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200444China

We have experimentally demonstrated the flat supercontinuum(SC)generation using a 10-m-long ZrF4-BaF2-LaF3-AlF3-NaF(ZBLAN)fluoride fiber pumped by an erbium-doped mode-locked fiber laser incorporating carbon-nanotube-based saturable *** order to improve the spectral flatness of SC,the standardized single-mode fiber with different lengths is connected to the output of the mode-locked fiber laser before the pulse *** generated SC with ZBLAN fiber exhibits the best spectral flatness with fluctuation less than 1.29 dB over the wavelength of 1571.8 nm−1803.1 nm,showing potential applications in optical sensing.

关键词： Flat supercontinuum ZBLAN mode-locked fiber laser

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Carboxymethyl chitosan as a polyampholyte mediating intrafibrillar mineralization of collagen via collagen/ACP self-assembly

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Journal of Materials Science & Technology 2019年第9期35卷 1894-1905页

作者： Mingli Lin huanhuan liu Jingjing Deng Ran An Minjuan Shen Yanqiu Li Xu Zhang School of Stomatology Hospital of Stomatology Tianjin Medical University

The significant role of the polyelectrolytic nature of non-collagenous proteins (NCPs) in regulating the in vivo mineralization of collagen provides important insights for scientists searching for analogues of NCPs to achieve in vitro collagen mineralization. Polyampholyte carboxymethyl chitosan (CMC) has both carboxyl and amino groups, which allows it to act as a cationic or anionic polyelectrolyte below or above its isoelectric point (IP), respectively. In this study, CMC was employed as the analogue of NCPs to stabilize amorphous calcium phosphate (ACP) under acidic conditions (pH < 3.5) via the formation of CMC/ACP nanocomplexes. In the presence of both ACP nanoparticles and acid collagen molecules, ACP nanoparticles could be integrated into collagen fibrils during the process of collagen self-assembly and achieve intrafibrillar mineralization of collagen in vitro (i.e., synchronous self-assembly/mineralization (SSM) of collagen). This mode of mineralization is different from established mechanisms in which mineralization follows the self-assembly (MFS) of collagen. Thus, SSM provides a new strategy for developing materials from mineralized collagen scaffolds.

关键词： Synchronous self-assembly/mineralization Intrafibrillar mineralization Polyampholyte Carboxymethyl chitosan Amorphous calcium phosphate

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Adsorption Activity and Molecular Dynamics Study on Anti-corrosion Mechanism of Q235 Steel

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Chemical Research in Chinese Universities 2018年第5期34卷 817-822页

作者： ZHANG Weiwei LI Huijing WU Yanchao LUO Qi liu huanhuan NIU Lin School of Marine Science and Technology Harbin Institute of Technology Weihai 264209 P. R. China School of Chemistry and Chemical Engineering Shandong University Jinan 250100 P. R. China

The correlation between inhibition efficiency and molecular structures of the inhibitor during hydrochloric acid corrosion of Q235 steel was studied by quantum chemical calculations and molecular dynamics（MD） simulation. The proton affmity（PA） calculations demonstrated that 2-（quinolin-2-yl）quinazolin4（3H）-one inhibitor has the ten- dency to be protonated in hydrochloric acid, which was in good agreement with experimental observations. Besides, quantum chemical parameters revealed that the protonated corrosion inhibitor molecules were more easily adsorbed on Q235 steel surface and improved the corrosion resistance of steel. MD simulations were implemented to search for the adsorption behavior of this molecule on Fe （110） surface, which might be used as a convenient tool for estimating the interaction mechanism between inhibitor and iron surface.

关键词： Q235 steel Corrosion inhibition Density functional theory Molecular dynamic simulation

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2000—2018年中国植被光学厚度时空动态特征及驱动因素

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地理学报 2023年第3期78卷 729-745页

作者：刘悦刘欢欢陈印刚成诚西北农林科技大学草业与草原学院杨凌712100 西北农林科技大学水土保持研究所杨凌712100 中国科学院水利部水土保持研究所杨凌712100

与传统光学遥感指标相比,微波遥感指标—植被光学厚度(VOD)具有对云和大气敏感性低和不易饱和的优势,可用于监测植被总含水量和生物量的变化。本文基于不同频率的VOD数据集(VODCA C-VOD、X-VOD、Ku-VOD和AMSRU X-VOD),利用趋势分析和残... 详细信息

与传统光学遥感指标相比,微波遥感指标—植被光学厚度(VOD)具有对云和大气敏感性低和不易饱和的优势,可用于监测植被总含水量和生物量的变化。本文基于不同频率的VOD数据集(VODCA C-VOD、X-VOD、Ku-VOD和AMSRU X-VOD),利用趋势分析和残差分析等方法研究了2000—2018年中国不同地区以及不同植被类型VOD的时空动态变化,并在全国及区域尺度上定量评估了气候变化和人类活动的相对贡献。结果表明:(1)中国植被VOD呈极显著增加趋势,AMSRU X-VOD增加速率最快(0.062/10a),尤其是华东地区,而VODCA CVOD增加速率最低(0.013/10a),其中西南地区增速最高;不同植被类型中,草丛的增速最快,其次为针叶林和灌丛。(2)降水和辐射的增加促进了华北和西北地区VOD的增加,气温的贡献主要分布在华南和沿海地区,辐射对表征植被冠层的Ku-VOD和X-VOD的贡献较高。(3)不同数据集均表明人类活动是植被VOD增加的主要因素,VODCA C-VOD、Ku-VOD、X-VOD和AMSRU X-VOD的人类活动贡献率分别为171%、48%、43%和30%,在黄土高原、西南地区和东北平原尤为突出。本文研究结果为生态工程成效评价提供新的数据支持,并为未来生态系统管理和碳增汇提供科学依据。

关键词：植被光学厚度(VOD) 时空动态气候变化人类活动

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Electrodeposition of Pt-Decorated Ni(OH)_(2)/CeO_(2) Hybrid as Superior Bifunctional Electrocatalyst for Water Splitting

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Research 2020年第1期2020卷 1698-1708页

作者： huanhuan liu Zhenhua Yan Xiang Chen Jinhan Li Le Zhang Fangming liu Guilan Fan Fangyi Cheng Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071China

The facile synthesis of highly active and stable bifunctional electrocatalysts to catalyze water splitting is attractive but ***,we report the electrodeposition of Pt-decorated Ni(OH)_(2)/CeO_(2)(PNC)hybrid as an efficient and robust bifunctional *** graphite-supported PNC catalyst delivers superior hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)activities over the benchmark Pt/C and RuO_(2),*** overall water electrolysis,the PNC hybrid only requires a cell voltage of 1.45V at 10mAcm-2 and sustains over 85 h at 1000mAcm^(-2).The remarkable HER/OER performances are attributed to the superhydrophilicity and multiple effects of PNC,in which Ni(OH)_(2)and CeO_(2)accelerate HER on Pt due to promoted water dissociation and strong electronic interaction,while the electron-pulling Ce cations facilitate the generation of high-valence Ni OER-active *** results suggest the promising application of PNC for H2 production from water electrolysis.

关键词： catalyst attributed attractive

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