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Sm^(2+)ions boost ammonia electrooxidation reaction on samarium oxide anode for hydrogen generation in non-aqueous electrolyte

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nano Research 2024年第7期17卷 5856-5862页

作者： xingyu Liu Xue Yang Han Sun Zekai Yang Haijun ch.n Tianjin Key Laboratory of Optoelectronic Thin Film Devices and Technology College of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China

Ammonia has garnered recognition as a zero-carbon fuel due to its high-density hydrogen storage capacity and its convenience for storage and *** address the challenges associated with the direct usage of ammonia,the development of nH_(3)-to-H_(2)conversion technologies has emerged as a promising and effective ***,we present for the first time that crystallized Sm_(2)O_(3−x)electrodes demonstrate high and stable electrocatalytic activities,including n_(2)evolution rate and Faradaic efficiency,for ammonia electrolysis in a non-aqueous *** was observed that Sm^(2+)ions in samarium oxide play an indispensable role in the ammonia electrooxidation reaction on the ***,the mech.nism of ammonia electrooxidation has also been elucidated,laying the foundation for a better understanding of the relationship between local structure and electrochemical properties in order to facilitate research on Pt-free electrocatalysts for the electrolysis of ammonia into H_(2).

关键词： nH_(3)-to-n_(2)conversion ammonia electrooxidation reaction ammonia electrolysis non-aqueous electrolyte samarium oxide

Simplified quantitative analysis method and its application in the insitu synthesized copper-based azide chips

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Defence Technology（防务技术） 2024年第2期32卷 309-316页

作者： Jie Ren Yunfeng Li Mingyu Li xingyu Wu Jiabao Wang Qingxuan Zeng State Key Laboratory of Explosion and Technology Beijing Institute of TechnologyBeijing 100081China

Copper-based azide(Cu(n_(3))2 or Cun_(3),CA)chips synthesized by in-situ azide reaction and utilized in miniaturized explosive systems has become a hot research topic in recent ***,the advantages of in-situ synthesis method,including small size and low dosage,bring about difficulties in quantitative analysis and differences in ignition capabilities of CA *** aim of present work is to develop a simplified quantitative analysis method for accurate and safe analysis of components in CA chips to evaluate and investigate the corresponding ignition *** this work,Cu(n_(3))2 and Cun_(3)components in CA chips were separated through dissolution and distillation by utilizing the difference in solubility and corresponding content was obtained by measuring n_(3)-concentration through *** spectrophotometry method was optimized by studying influencing factors and the recovery rate of different separation methods was studied,ensuring the accuracy and reproducibility of test *** optimized method is linear in range from 1.0-25.0 mg/L,with a correlation coefficient R^(2)=0.9998,which meets the requirements of CA chips with a milligram-level content *** with the existing ICP method,component analysis results of CA chips obtained by spectrophotometry are closer to real component content in samples and have satisfactory ***,as its application in miniaturized explosive systems,the ignition ability of CA chips with different component contents for direct ink writing CL-20 and the corresponding mech.nism was *** study provided a basis and idea for the design and performance evaluation of CA chips in miniaturized explosive systems.

关键词： Copper-based azide chips Spectrophotometry Separation method Quantitative analysis Ignition ability

Enhancing the dielectric and piezoelectric properties of Pb_(0.99)Gd_(0.01)Zr_(0.53)Ti_(0.47)O_(3) ferroelectric ceramics by Sr-doping

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Journal of Advanced Dielectrics 2024年第4期14卷 71-79页

作者： xingyu Wang Lingfeng Li Yu ch.n School of Mech.nical Engineering ch.ngdu University Chengdu 610106P.R.China

Recently,high-performance lead zirconate titanate(Pb(Zr_(1-x)Ti_(x))O_(3),PZT)ferroelectric ceramics have attracted intensive attention due to their wider operating temperature range,better temperature stability,as well as larger piezoelectric properties and higher energy conversion *** this study,the perovskite-type ferroelectric ceramics with a chemical formula of Pb_(0.99-x)Gd_(0.01)Sr_(x)Zr_(0.53)Ti_(0.47)O_(3)(x=0 and 0.02,*** and PGSZT,respectively)were prepared by the traditional solid-state reaction *** influences of Sr-doping on the phase structure,dielectric properties,ferroelectric properties and piezoelectric properties of the PGZT ceramics were comprehensively *** field-dependent P–E hysteresis loops of PGSZT were measured in the frequency range of 0.05–10 Hz and temperature range of 20–100℃.The results show that Sr-doping not only enhances the dielectric permittivity and piezoelectric coefficient of PGZT,but also decreases its dielectric loss tangent,with the d_(33) value of 473 pC/n,ε_(r) value of 1586 and tanδvalue of 0.016 found in ***,PGSZT shows a high Curie temperature(T_(C))of 350℃.The underlying mech.nisms of the property enhancement were identified as that the introduced Sr^(2+) replaces the volatile Pb^(2+) located at the A-site of the perovskite structure,thereby reducing the concentration of lead vacancies and promoting the grain growth of the ceramics,consequently enhancing the dielectric and piezoelectric properties of *** the other hand,the frequency ch.nge in the low-frequency range(nificant impact on the remanent polarization(P_(r))and internal biased electric field(E_(i))of PGSZT,but the frequency dependence of coercive field(E_(c))tends to diminish in the high-frequency range(≥1 Hz).

关键词： Pb(Zr_(1-x)Ti_(x))O_(3) Sr-doping dielectric properties piezoelectric properties ferroelectric ceramics

Discovering the ultralow thermal conductive A_(2)B_(2)O_(7)-type high-entropy oxides through the hybrid knowle dge-assiste d data-driven mach.ne learning

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Journal of Materials Science & Technology 2024年第1期168卷 131-142页

作者： Ying Zhang Ke Ren William Yi Wang xingyu Gao Ruihao Yuan Jun Wang Yiguang Wang Haifeng Song Xiubing Liang Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Innovation Center NPU ChongqingChongqing 401135China Institute of Advanced Structure Technology Beijing Institute of TechnologyHaidian DistrictBeijing 100081China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Defense Innovation Institute Academy of Military Sciences of the PLA of ChinaBeijing 100071China

Lattice engineering and distortion have been considered one kind of effective strategies for discovering advanced *** instinct chemical flexibility of high-entropy oxides(HEOs)motivates/accelerates to tailor the target properties through phase transformations and lattice ***,a hybrid knowledge-assisted data-driven mach.ne learning(ML)strategy is utilized to discover the A_(2)B_(2)O_(7)-type HEOs with low thermal conductivity(κ)through 17 rare-earth(RE=Sc,Y,La-Lu)solutes optimized A-site.A designing routine integrating the ML and high throughput first principles has been proposed to predict the key physical parameter(KPPs)correlated to the targetedκof advanced *** the smart-designed 6188(5RE_(0.2))_(2)Zr_(2)O_(7)HEOs,the best candidates are addressed and validated by the princi-ples of severe lattice distortion and local phase transformation,which effectively reduceκby the strong multi-phonon scattering and weak interatomic ***,(Sc_(0.2)Y_(0.2)La_(0.2)Ce_(0.2)Pr_(0.2))_(2)Zr_(2)O_(7)with predictedκbelow 1.59 Wm^(−1)K^(−1)is selected to be verified,which matches well with the ex-perimentalκ=1.69 Wm^(−1)K^(−1)at 300 K and could be further decreased to 0.14 Wm^(−1)K^(−1)at 1473 ***,the coupling effects of lattice vibrations and charges on heat transfer are revealed by the cross-validations of various models,indicating that the weak bonds with low electronegativity and few bond-ing charge density and the lattice distortion(r∗)identified by cation radius ratio(r A/r B)should be the KPPs to decreaseκ*** work supports an intelligent designing strategy with limited atomic and electronic KPPs to accelerate the development of advanced multi-component HEOs with proper-ties/performance at multi-scales.

关键词： High-entropy oxides Thermal conductivity Pyrochlore Key physical parameter First-Principles

Sulfur doped iron-nitrogen-hard carbon nanosheets as efficient and robust noble metal-free catalysts for oxygen reduction reaction in PEMFC

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Journal of Energy chemistry 2024年第2期89卷 422-433,I0010页

作者： Bin Liu Jiawang Li Bowen Yan Qi Wei xingyu Wen Huarui Xie Huan He Pei Kang Shen Zhi Qun Tian Collaborative Innovation Center of Sustainable Energy Materials School of Physical Science and TechnologyGuangxi UniversityGuangxi Key Laboratory of Electrochemical Energy MaterialsState Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresNanning 530004GuangxiChina

Transition metal-nitrogen-carbon(M-n-C)as a promising substitute for the conventional noble metalbased catalyst still suffers from low activity and durability for oxygen reduction reaction(ORR)in proton exch.nge membrane fuel cells(PEMFCs).To tackle the issue,herein,a new type of sulfur-doped ironnitrogen-hard carbon(S-Fe-n-HC)nanosheets with high activity and durability in acid media were developed by using a newly synthesized precursor of amide-based polymer with Fe ions based on copolymerizing two monomers of 2,5-thiophene dicarboxylic acid(TDA)as S source and 1,8-diaminonaphthalene(DAn)as n source via an amination *** as-synthesized S-Fe-n-HC features highly dispersed atomic Fe nxmoieties embedded into rich thiophene-S doped hard carbon nanosheets filled with highly twisted graphite-like microcrystals,which is distinguished from the majority of M-n-C with soft or graphitic carbon *** unique characteristics endow S-Fe-n-HC with high ORR activity and outstanding durability in 0.5 M H_(2)SO_(4).Its initial half-wave potential is 0.80 V and the corresponding loss is only 21 m V after 30,000 ***,its practical PEMFC performance is a maximum power output of 628.0 mW cm^(-2)and a slight power density loss is 83.0 m W cm^(-2)after 200-cycle practical ***,theoretical calculation shows that the activity of Fe nxmoieties on ORR can be further enhanced by sulfur doping at meta-site near Fen_(4)*** results evidently demonstrate that the dual effect of hard carbon substrate and S doping derived from the precursor platform of amid-polymers can effectively enhance the activity and durability of Fe-n-C catalysts,providing a new guidance for developing advanced M-n-C catalysts for ORR.

关键词： Transition metal-nitrogen-carbon Oxygen reduction reaction Hard carbon Amide based polymer reaction Proton exch.nge membrane cells

Ionic liquid driven nanostructure self-assembly in organic mixed ionic-electronic conductors

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Green chemical Engineering 2024年第3期5卷 273-275页

作者： xingyu Hu ning Mao Dezhen Zhao Xu Liu Qingqing Sun Huige Yang Xuying Liu Hanyu Jia School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

As a type of three-terminal transistor,organic electrochemical transistors(OECTs)can effectively modulate their ch.nnel conductivity through ionic electrochemical doping across gate-electrolyte-ch.nnel routes,endowing their versatile applications in bioelectronics,low power logic circuit,and neuromorphic computing[1].In the concrete,free cations/anions in aqueous electrolytes driven by gate voltage can effectively penetrate into the bulk ch.nnel,then resulting in the volumetric n/p-doping of ch.nnel ***,the film thickness of the ch.nnel also involves the modulation of OECT performance owing to the polymer swelling and ion penetration,which is hardly occurred in other transistors working in field-effect mode.

关键词： doping ionic swelling

B-n covalent bond-involved π-extension of multiple resonance emitters enables high-performance narrowband electroluminescence

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national Science Review 2024年第6期11卷 243-253页

作者： xingyu Huang Jiahui Liu Yulin Xu Guohao ch.n Manli Huang Mingxin Yu Xialei Lv Xiaojun Yin Yang Zou Jingsheng Miao Xiaosong Cao chuluo Yang Shenzhen Key Laboratory of new Information Display and Storage Materials College of Materials Science and EngineeringShenzhen University College of Physics and Optoelectronic Engineering Shenzhen University

Multi-boron-embedded multiple resonance thermally activated delayed fluorescence（MR-TADF） emitters show promise for achieving both high color-purity emission and high exciton utilization ***, their development is often impeded by a limited synthetic scope and excessive molecular weights,which challenge material acquisition and organic light-emitting diode（OLED） fabrication by vacuum deposition. Herein, we put forward a B–n covalent bond-involved π-extension strategy via post-functionalization of MR frameworks, leading to the generation of high-order B/n-based motifs. The structurally and electronically extended π-system not only enhances molecular rigidity to narrow emission linewidth but also promotes reverse intersystem crossing to mitigate efficiency roll-off. As illustrated examples, ultra-narrowband sky-blue emitters（full-width at half-maximum as small as 8 nm in n-hexane）have been developed with multi-dimensional improvement in photophysical properties compared to their precursor emitters, which enables narrowband OLEDs with external quantum efficiencies(EQEmax) of up to 42.6%, in company with alleviated efficiency decline at high brightness, representing the best efficiency reported for single-host OLEDs. The success of these emitters highlights the effectiveness of our molecular design strategy for advanced MR-TADF emitters and confirms their extensive potential in high-performance optoelectronic devices.

关键词： narrowband electroluminescence thermally activated delayed fluorescence (TADF) multiple resonance emitters ultra-high external quantum efficiency

Pseudomonas aeruginosa regulator PvrA binds simultaneously to multiple pseudo-palindromic sites for efficient transcription activation

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Science ch.na(Life Sciences) 2024年第5期67卷 900-912页

作者： Yibo Zhu Bingnan Luo xingyu Mou Yingjie Song Yonghong Zhou Yongbo Luo Bo Sun Youfu Luo Hong Tang Zhaoming Su Rui Bao Center of Infectious Diseases Division of Infectious Diseases in State Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengdu 610041China Department of Geriatrics and national Clinical Research Center for Geriatrics West China HospitalSichuan UniversityChengdu 610041China Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau Ministry of EducationSchool of Ecology and EnvironmentTibet UniversityLhasa 850000China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China College of Life Science Sichuan Normal UniversityChengdu 610101China Accurate Biotechnology(Hunan)Co. LtdChangsha 410006China

Tetracycline repressor(TetR)family regulators(TFRs)are the largest group of DnA-binding transcription factors and are widely distributed in bacteria and *** play vital roles in controlling the expression of various genes and regulating diverse physiological ***,a TFR protein Pseudomonas virulence regulator A(PvrA),was identified from Pseudomonas aeruginosa as the transcriptional activator of genes involved in fatty acid utilization and bacterial ***,we show that PvrA can simultaneously bind to multiple pseudo-palindromic sites and upregulate the expression levels of target ***-electron microscopy(cryo-EM)analysis indicates the simultaneous DnA recognition mech.nism of PvrA and suggests that the bound DnA fragments consist of a distorted B-DnA double *** crystal structure and functional analysis of PvrA reveal a hinge region that secures the correct domain motion for recognition of the promiscuous ***,our results showed that mutations disrupting the regulatory hinge region have differential effects on biofilm formation and pyocyanin biosynthesis,resulting in attenuated bacterial ***,these findings will improve the understanding of the relationship between the structure and function of the TetR family and provide new insights into the mech.nism of regulation of *** virulence.

关键词： Pseudomonas aeruginosa transcription regulator TetR protein-structure virulence

An optimized strategy of nitrogen-split application based on the leaf positional differences in chlorophyll meter readings

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Journal of Integrative Agriculture 2024年第8期23卷 2605-2617页

作者： Gaozhao Wu xingyu ch.n Yuguang Zang Ying Ye Xiaoqing Qian Weiyang Zhang Hao Zhang Lijun Liu Zujian Zhang Zhiqin Wang Junfei Gu Jianch.ng Yang Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Agricultural College Yangzhou UniversityYangzhou 225009China Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops Yangzhou UniversityYangzhou 225009China Key Laboratory of Arable Land Quality Monitoring and Evaluation Ministry of Agriculture and Rural AffairsYangzhou UniversityYangzhou 225127China

Modern rice production faces the dual challenges of increasing grain yields while reducing inputs of chemical ***,the disequilibrium between the nitrogen(n)supplement from the soil and the demand for n of plants is a serious obstacle to achieving these ***-based diagnosis can help farmers make better choices regarding the timing and amount of topdressing n *** objective was to evaluate a non-destructive assessment of rice n demands based on the relative SPAD value(RSPAD)due to leaf positional *** this study,two field experiments were conducted,including a field experiment of different n rates(Exp.I)and an experiment to evaluate the new strategy of nitrogen-split application based on RSPAD(***).The results showed that higher n inputs significantly increased grain yield in modern high yielding super rice,but at the expense of lower nitrogen use efficiency(nUE).The n nutrition index(nnI)can adequately differentiate situations of excessive,optimal,and insufficient n nutrition in rice,and the optimal n rate for modern high yielding rice is higher than conventional *** RSPAD is calculated as the SPAD value of the top fully expanded leaf *** value of the third leaf,which takes into account the non-uniform n distribution within a *** RSPAD can be used as an indicator for higher yield and nUE,and guide better management of n fertilizer ***,we developed a new strategy of nitrogen-split application based on RSPAD,in which the n rate was reduced by 18.7%,yield was increased by 1.7%,and the agronomic n use efficiency was increased by 27.8%,when compared with standard farmers'*** strategy of n fertilization shows great potential for ensuring high yielding and improving nUE at lower n inputs.

关键词： canopy crop management practices nitrogen nitrogen nutrition index rice SPAD