检索结果-南通市图书馆

Highly dispersed ru nanospecies on n-doped carbon/MXene composite for highly efficient alkaline hydrogen evolution

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 153-159页

作者： Minying Wu Xueliang Fan Wenbiao Zhang Bin Chen Tong Ye Qian Zhang yuanyuan Fang Yajun Wang Yi Tang Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materialsand Laboratory of Advanced MaterialsFudan UniversityShanghai 200438China College of Chemistry&Materials Engineer.ng Wenzhou UniversityWenzhou 325027China

Hydrogen has emerged as a promising envir.nmentally friendly energy source. The development of lowcost, highly active, stable, and easily synthesized catalysts for hydrogen evolution reactions(HEr) remains a significant challenge. This study explored the synthesis of nitrogen-doped MXene-based composite catalysts for enhanced HEr performance. By thermally decomposing ruCl_(3) coordinated with melamine and formaldehyde resin, we successfully introduced nitrogen-doped carbon(n–C) with highly dispersed ruthenium(ru) onto the MXene surface. The calcination temperature played a crucial role in controlling the size of ru nanoparticles(ru nPs) and the proportion of ru single-atom(ru SA), thereby facilitating the synergistic enhancement of HEr performance by ru nPs and ru SA. The resulting catalyst prepared with a calcination temperature of 600℃, Ti_(3)C_(2)T_x-n/C-ru-600(TnCr-600), exhibited exceptional HEr activity(η10= 17 m V) and stability(160 h) under alkaline conditions. This work presented a simple and effective strategy for synthesizing composite catalysts, offer.ng new insights into the design and regulation of high-performance ru-based catalysts for hydrogen production.

关键词： HEr activity Highly dispersed ru-based catalysts MXene Alkaline condition

Impact of oxygen incorporation on interface optimization and defect suppression for efficiency enhancement in Cu_(2)ZnSn(S,Se)_(4)solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第8期95卷 77-85,I0003页

作者： Shicheng Deng Songfan Wang yuanyuan Wang Qian Xiao Yuena Meng Dongxing Kou Wenhui Zhou Zhengji Zhou Zhi Zheng Sixin Wu Key Laboratory for Special Functional Materials of MOE National&Local Joint Engineering Research Centre for High-efficiency Display and Lighting TechnologySchool of MaterialsHenan UniversityKaifeng 475004HenanChina Key Laboratory of Micro-nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano MaterialsCollege of Chemical and Materials EngineeringXuchang UniversityXuchang 461000HenanChina

Kesterite Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)solar cells suffer from severe carrier recombination,limiting the photovoltaic *** energy band alignment at the p-n junction and defective fr.nt interface are two main ***,oxygen incorporation in CZTSSe via absorber air-annealing was developed as a strategy to optimize its surface photoelectric property and reduce the *** optimized oxygen incorporation conditions,the carrier separation and collection behavior at the fr.nt interface of the device is *** particular,it is found that oxygen incorporated absorber exhibits increased band bending,larger depletion region width,and suppressed absorber *** indicate the dynamic factors for carrier separation become ***,the increased potential differ.nce between grain boundaries and intra grains combined with the decreased concentration of interface deep level defect in the absorber provide a better path for carrier *** a consequence,the champion efficiency of CZTSSe solar cells has been improved from 9.74%to 12.04%with significantly improved open-circuit voltage after optimized air-annealing *** work provides a new insight for interface engineer.ng to improve the photoelectric conversion efficiency of CZTSSe devices.

关键词： Kesterite Thin film solar cell Interface optimization Surface oxidation Defect suppression

TiO_(2)Electr.n Tr.nsport Layer with p-n Homojunctions for Efficient and Stable Perovskite Solar Cells

在线全文

学校读者我要写书评

暂无评论

nano-Micro Letters 2024年第10期16卷 1-14页

作者： Wenhao Zhao Pengfei Guo Jiahao Wu Deyou Lin ning Jia Zhiyu Fang Chong Liu Qian Ye Jijun Zou yuanyuan Zhou Hongqiang Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi'an 710072People's Republic of China Department of Chemical and Biological Engineer.ng Hong Kong University of Science and TechnologyClear Water BayHong Kong SARPeople's Republic of China Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072People's Republic of China Chongqing Innovation Center of northwestern Polytechnical UniversityNorthwestern Polytechnical UniversityChongqing 401135People's Republic of China

Low-temperature processed electr.n tr.nsport layer(ETL)of TiO_(2)that is widely used in planar perovskite solar cells(PSCs)has inher.nt low carrier mobility,resulting in insufficient photogenerated elec-tr.n tr.nsport and thus recombination loss at buried ***,we demonstrate an effective strategy of laser embedding of p-n homojunctions in the TiO_(2)ETL to accelerate electr.n tr.nsport in PSCs,through localized build-in electric fields that enables boosted electr.n mobility by two orders of *** embedding is found significantly helpful for.not only the enhanced crystallization quality of TiO_(2)ETL,but the fabrication of perovskite films with larger-grain and the *** embedded p-n homojunction enables also the modulation of interfacial energy level between perovskite layers and ETLs,favor.ng for the reduced voltage deficit of *** from these merits,the formamidinium lead iodide(FAPbI_(3))PSCs employing such ETLs deliver a champion efficiency of 25.50%,along with much-improved device stability under harsh conditions,i.e.,maintain over 95%of their initial efficiency after operation at maximum power point under continuous heat and illumination for 500 h,as well as mixed-cation PSCs with a champion efficiency of 22.02%and over 3000 h of ambient storage under humidity stability of 40%.Present study offers new possibilities of regulating charge tr.nsport layers via p-n homojunction embedding for high performance optoelectr.nics.

关键词： Electr.n tr.nsport layer p-n homojunction Electr.n mobility Buried interface Perovskite solar cells

Electr.n-tr.nsporting bor.n-doped polycyclic aromatic hydrocarbons:Facile synthesis and heteroatom doping positions-modulated optoelectr.nic properties

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 447-451页

作者： Tingting Huang Zhuanlong Ding Hao Liu Ping-An Chen Longfeng Zhao yuanyuan Hu Yifan Yao Kun Yang Zebing Zeng Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Shenzhen research Institute of Hunan University Shenzhen 518000China Key Laboratory for Micro/nano Optoelectr.nic Devices of Ministry of Education and Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electr.nics Hunan UniversityChangsha 410082China

While heteroatom doping serves as a powerful strategy for devising novel polycyclic aromatic hydrocarbons(PAHs), the further fine-tuning of optoelectr.nic properties via the precisely alter.ng of doping patterns remains a challenge. Herein, by changing the doping positions of heteroatoms in a diindenopyr.ne skeleton, we report two isomeric bor.n, sulfur-embedded PAHs, named Anti-B_(2)S_(2) and Syn-B_(2)S_(2), as electr.n tr.nsporting semiconductors. Detailed structure-property relationship studies revealed that the varied heteroatom positions not only change their physicochemical properties, but also largely affect their solid-state packing modes and Lewis base-triggered photophysical responses. With their low-lying fr.ntier molecular orbital levels, n-type characteristics with electr.n mobilities up to 1.5 × 10^(-3)cm^(2)V^(-1)s^(-1)were achieved in solution-processed organic field-effect tr.nsistors. Our work revealed the critical role of controlling heteroatom doping patterns for designing advanced PAHs.

关键词： Polycyclic aromatic hydrocarbon Optoelectr.nic properties Heteroatom doping n-Type organic semiconductors Structure–property relationship

Mechanical robust and self-healing flexible perovskite solar cells with efficiency exceeding 23%

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第8期67卷 2670-2678页

作者： Yaohua Wang ruikun Cao yuanyuan Meng Bin Han ruijia Tian Xiaoyi Lu Zhenhua Song Shuncheng Yang Congda Lu Chang Liu Ziyi Ge College of Mechanical Engineer.ng Zhejiang University of TechnologyHangzhou 310014China Zhejiang Provincial Engineer.ng research Center of Energy Optoelectr.nic Materials and Devices Ningbo Institute of Materials TechnologyEngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectr.nics Engineer.ng University of Chinese Academy of Sciences Beijing 100049China

Flexible perovskite solar cells(f-PSCs) have experienced rapid advancements due to the light-weight, flexibility, and solution processability of the perovskite materials, which prompted the power conversion efficiency(PCE) to 24.08%. However, f-PSCs still face challenges in terms of mechanical and envir.nmental stability. This is primarily due to their inher.nt brittleness, the presence of residual tensile strain, and the high density of defects along the boundaries of perovskite grains. To this end, we carefully developed a cross-linkable elastomers 3-[(3-acrylamidopropyl)dimethylammonium] propanoate(ADP) with electrostatic dynamic bond, which could be in-situ cross-linked and coordinate with [Pb I6]4-to regulate the crystallization process of perovskite. The cross-linked elastomers attached to the perovskite grain boundaries could release the remaining tensile strains and mechanical stresses, leading to enhanced stability and flexibility of the f-PSCs. More importantly, the electrostatic interaction between positive and negative groups of cross-linked elastomers and hydrogen bond formation between n–H and C=O accelerate the cross-linking of ADP, endowing the flexible perovskite films with self-healing ability under mild treating conditions(60 °C for 30 min). As a result, the device achieves a remarkable PCE of 23.53%(certified 23.16%). Additionally, the device exhibits impressive mechanical sustainability and durability, retaining over 90% of initial PCE even after undergoing8,000 bending cycles.

关键词： Mechanical robust and self-healing flexible perovskite solar cells with efficiency exceeding 23

Arabidopsis WrKY1 promotes monocarpic senescence by integrative regulation of flower.ng,leaf senescence,and nitrogen remobilization

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2024年第8期17卷 1289-1306页

作者： Wei Zhang Shufei Tang Xuying Li yuanyuan Chen Jiajia Li Yuyang Wang ruichao Bian Ying Jin Xiaoxian Zhu Kewei Zhang Zhejiang Provincial Key Laboratory of Biotechnology on Specialty Economic Plants College of Life SciencesZhejiang Normal UniversityJinhuaZhejiang 321004P.R.China

Monocarpic senescence,characterized by whole-plant senescence following a single flower.ng phase,is widespread in seed plants,particularly in crops,determining seed harvest time and ***,how external and internal signals are systemically integrated into monocarpic senescence remains largely ***,we report that the Arabidopsis thaliana tr.nscription factor WrKY1 plays essential roles in multiple key steps of monocarpic ***1 expression is induced by age,salicylic acid(SA),and nitrogen(n)*** and leaf senescence are accelerated in the WrKY1 overexpression lines but are delayed in the wrky1 *** combined DnA affinity purification sequencing and rnA sequencing analyses uncover the direct target genes of *** studies show that WrKY1 coordinately regulates three processes in monocarpic senescence:(1)suppressing FLOWEr.nG LOCUS C gene expression to initiate flower.ng,(2)inducing SA biosynthesis genes to promote leaf senescence,and(3)activating the n assimilation and tr.nsport genes to trigger.n *** summary,our study reveals how one stress-responsive tr.nscription factor,WrKY1,integrates flower.ng,leaf senescence,and n remobilization processes into monocarpic senescence,providing important insights into plant lifetime regulation.

关键词： monocarpic senescence leaf senescence flower.ng time nitrogen remobilization salicylic acid WrKY tr.nscription factor

Molecular catalysts for electrocatalytic ammonia oxidation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年

作者： Jun Li Feiyang Zhang Huatian Xiong yuanyuan Cai Biaobiao Zhang Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry School of Science and Research Center for Industries of the Future Westlake University Institute of natural Sciences Westlake Institute for Advanced Study Division of Solar Energy Conversion and Catalysis at Westlake University Zhejiang Baima Lake Laboratory Co. Ltd.

Electrocatalytic ammonia oxidation reaction (eAOr) is of significance to ammonia fuel economy and the production of valuable n-containing products, such as nitrite, nitrate and hydrazine. The study of well-defined molecular catalysts offers rich insights in terms of the detailed mechanism of ammonia oxidation. This review analyzes the thermodynamics of ammonia oxidation reactions and summarizes the curr.nt progress in molecular electrocatalysts in this booming field. We emphasized the factors that influence the selectivity of products and further discussed the challenges in designing efficient catalysts.

关键词：

Enhanced piezoelectricity of Cu-doped K(Ta,nb)O_(3) single crystals

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2024年第5期10卷 1017-1025页

作者： Fulin Zhang Songtao Fan Yingxu Zhu Wendie Chen Bing Liu Yuguo Yang Limei Zheng yuanyuan Zhang Xianshun Lv Xuping Wang Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan250014China Qilu University of Technology(Shandong Academy of Sciences) Advanced Materials InstituteKey Laboratory of Light Conversion Materials and Technology of Shandong Academy of SciencesJinan250014China School of Physics Shandong UniversityJinan250100China

As a class of solid solution material,K(Ta,nb)O3(KTn)single crystals have attracted significant interest due to their excellent piezoelectric and electro-optic *** this study,the piezoelectric properties of KTn were improved through Cu *** the advantages of composition-regulating phase tr.nsition,a large,high-quality Cu:KTn crystal measur.ng 30 mm×25 mm×20 mm in size was grown using the improved top seeded solution growth ***-doped KTn exhibited better piezoelectric properties than pure KTn,and the full matrix parameters were *** dielectric,piezoelectric,and electromechanical coupling responses(ε^(T)_(11)-2,136,d_(33)∼303 pC/n,k_(t)∼0.515,and k33∼0.672)were successfully *** realize the optimized orientation of the piezoelectric properties,the orientation dependence of the single domain properties was investigated,and the mechanism of Cu doping to improve piezoelectric properties was *** found that 0.36%(in mass)Cu doped crystal consisted of A-site substitution,following ferroelectric and domain *** small ferroelectric domain sizes led to a large domain wall mobility rate and high domain wall density,which contributed to high piezoelectric *** work revealed the effect of A-position doping on piezoelectric properties and provided a theoretical and experimental foundation for the performance optimization of KTn-based materials.

关键词： Solid solution material Lead-free piezoelectric Enhanced piezoelectricity

Zwitterionic r.ng-opening polymerization of macrocyclic ethyleneoxy-substituted carbonate:Access to cyclic PEG-like polycarbonate

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第3期35卷 282-286页

作者： Jin Huang Jinwen Li rui Yan yuanyuan Qu Fengzhen Guo Lei Shen Can-liang Ma Jie Sun Zhenjiang Li Kai Guo State Key Laboratory of Materials-Oriented Chemical Engineer.ng College of Biotechnology and Pharmaceutical EngineeringNanjing Tech UniversityNanjing 211816China Institute of nanjing Advanced Biomaterials&Processing Equipment Lishui Economic Development ZoneNanjing 211299China

The innovation in polymer design to rival conventional polyethylene glycol(PEG)is an important approach to achieving a more sustainable ***,cyclic PEG-like polycarbonates having high molecular weight(4.4–49.5 kg/mol)were enabled through zwitterionic r.ng-opening polymerization(ZrOP)of macrocyclic carbonates(MCs)mediated by n-heterocyclic carbene(nHC).The thermodynamic behavior of polymerization depends on the r.ng size of *** this process,the ZrOP of 11-membered MC was driven by the change of enthalpy(ΔH_(p))which differed from the ZrOP of 14-membered MC driven by the entropic change(ΔS_(p)).Cyclic polycarbonates depicted improved thermostability(T_(d5%)≥204℃)and higher glass tr.nsition temperatures(T_(g)>–40℃)in comparison to their linear analogues(T_(d5%)≤185℃,T_(g)~–50℃).In addition,the mechanism of ZrOP of MC was addressed through computational study.A distinct mechanism of polymerization distinguishable from the well-known nHC-mediated ZrOP of cyclic esters was revealed,where the zwitterion from nucleophilic addition to MC,*** intermediate,cannot be r.ng-opened probably due to the delocalization of negative charge on the carbonate group,but serves as an active center for the *** comparison to PEG,the attained polymer demonstrated comparable hydrophilic and biocompatible properties,as revealed by the results of contact angle and in vitro cytotoxicity studies,suggesting that cyclic polycarbonate hold the promise as the alternative of PEG.

关键词： Zwitterionic r.ng-opening polymerization Cyclic polycarbonate Macrocycles Tetrahedral intermediate nHC carbene