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Single-atom Cu anchored on N-doped graphene/carbon nitride heterojunction for enhanced photocatalytic H_(2)O_(2) production

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Journal of materials Science & technology 2023年第30期161卷 192-200页

作者： Han Li Bicheng Zhu Bei Cheng Guoqiang Luo Jingsan Xu Shaowen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430078China School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD 4000Australia

Photocatalytic production of H_(2)O_(2) by polymeric carbon nitride has been regarded as a promising ap-proach for the conversion of solar energy into valuable ***,the efficiency of pristine car-bon nitride is limited by the rapid charge recombination and the lack of suitable active ***,we introduce single-atom Cu anchored on N-doped graphene(Cu-NG)as a cocatalyst coupled with carbon nitride via covalent bonding to enhance photocatalytic H_(2)O_(2) *** Cu-NG/carbon nitride could broaden the light absorption from UV to near-infrared region,contributing to the photocatalytic ***,NG containing electron-rich N atoms could serve as anchoring sites for stabilizing single-atom ***,the single-atom Cu acts not only as an electron sink to steer the interfacial charge sep-aration but also as an active site for molecular oxygen adsorption and *** the synergistic effect of the enhanced interfacial charge separation and suitable active sites,Cu-NG/carbon nitride ex-hibits improved photocatalytic performance with an H_(2)O_(2) generation rate of 2856μmol g^(−1)h^(−1),which is 2.6 times that of pristine carbon *** work provides a protocol for high-performance photocat-alytic H_(2)O_(2) production using a single-atom cocatalyst.

关键词： Single-atom catalysis Interfacial charge separation Photocatalytic H_(2)O_(2)production

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Construction of dendritic Pt–Pd bimetallic nanotubular heterostructure for advanced oxygen reduction

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Interdisciplinary materials 2024年第6期3卷 907-918页

作者： Mingwei Wang Zhiyi Hu Jieheng Lv Zhiwen Yin Zhewei Xu Jingfeng Liu Shihao Feng Xiaoqian Wang Jiazhen He Sicheng Luo Dafu Zhao Hang Li Xuemin Luo Qi Liu Damin Liu Baolian Su Dongyuan Zhao Yong Liu International School of Materials Science and Engineering(ISMSE) State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhanChina Department of Chemistry Laboratory of Inorganic Materials ChemistryUniversity of NamurNamurBelgium Department of Chemistry Laboratory of Advanced MaterialsShanghai Key Lab of Molecular Catalysis and Innovative MaterialsState Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghaiChina

Compositions and morphologies of Pt-based electrocatalysts have great impact on the electrocatalytic activity and stability of oxygen reduction reaction(ORR).Herein,we report a novel design of one-dimensional(1D)Pt-Pd dendritic nanotubular heterostructures(DTHs)by controlling the degree of Pt 2+-Pt reduction reaction and Pd-Pt galvanic replacement reaction with uniform Pd nanowires as sacrificial *** obtained Pt-Pd bimetallic DTHs catalyst exhibited uniform and dense Pt dendritic nanobranches on the surface of 1D hollow Pt-Pd alloy nanotubes,possessing superior catalytic activity for ORR compared to state-of-the-art commercial Pt/C ***,the Pt_(4)Pd DTHs catalyst showed efficient mass activity(MA,1.05 A mg_(Pt)^(−1))and specific activity(SA,1.25 mA cm_(Pt)^(−2))at 0.9 V(***),and the catalyst exhibited high stability with 90.4%MA retention after 20000 potential *** Pt-Pd bimetallic DTHs configuration combines the advantages of 1D hollow nanostructures and dense Pt dendritic nanobranches,which results in rich electrochemical active surface sites,fast charge transport,and multiple dendritic anchoring points contact on carbon support,thus boosting its catalytic activity and stability towards electrocatalysis.

关键词： dendritic hollow heterostructures electrocatalysis one-dimensional nanowires oxygen reduction proton exchange membrane fuel cells

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Mitigating the dissolution of V_(2)O_(5) in aqueous ZnSO_(4) electrolyte through Ti-doping for zinc storage

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Chinese Chemical Letters 2024年第1期35卷 558-562页

作者： Zihe Wei Xuehua Wang Ting Zhu Ping Hu Liqiang Mai Liang Zhou Hubei Longzhong Laboratory Wuhan University of Technology(Xiangyang Demonstration Zone)Xiangyang 441000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China

Aqueous zinc-ion batteries(AZIBs)have become a hotspot for electrochemical energy storage owing to the high safety,low cost,environmental friendliness,and favorable rate ***,the serious dissolution of cathode materials in aqueous electrolytes would lead to poor cyclability,which should be addressed before ***,we designed a Ti-doped V_(2)O_(5) with yolk-shell microspherical structure for *** Ti doping stabilizes the crystal structure and relieves the dissolution of V_(2)O_(5) in aqueous ZnSO_(4) *** optimized sample,Ti_(0.2)V_(1.8)O_(4.9),delivers a high capacity(355 mAh/g at 0.05 A/g)as well as good capacity retention(89%after 2500 cycles at 1.0 A/g).This work provides an effective strategy to mitigate the dissolution of cathode material in aqueous ZnSO_(4) electrolyte for cyclability enhancement.

关键词： Aqueous zinc-ion batteries V_(2)O_(5)cathode materials Aqueous ZnSO_(4)electrolyte Yolk-shell structure Ti doping

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Dynamic photoluminescence switching of carbon nitride thin films for anticounterfeiting and encryption

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Chinese Journal of Structural Chemistry 2024年第10期43卷 49-54页

作者： Hang Meng Bicheng Zhu Ruolun Sun Zixuan Liu Shaowen Cao Kan Zhang Jiaguo Yu Jingsan Xu School of Chemistry and Physics and Centre for Materials Science Queensland University of TechnologyBrisbaneQueensland4000Australia Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan430074China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Department of Materials Science and Key Laboratory of Automobile Materials MOEState Key Laboratory of Superhard MaterialsJilin UniversityChangchun130012China

Photoluminescence(PL)has been increasingly applied in anticounterfeiting and encryption as counterfeiting becomes more ***,common luminescent encryption techniques are based on static PL mea-surements and are easy to *** this work,we have developed a thermal vapor deposition(TVD)approach using melem as the unique starting material to synthesize highly homogeneous carbon nitride(CN)thin films featuring unique dynamic PL switching *** being irradiated by a white LED,the blue PL in-tensity of the CN film increases significantly and then fades in darkness,demonstrating excellent *** results prove that CN films contain cyano groups in the structure,and density functional theory(DFT)calculations indicate that the integration of cyano groups results in traps within the bandgap of CN,sug-gesting that the dynamic PL switching effect is essentially associated with the fullness of the trap *** have therefore developed an advanced luminescent device for the secure transmission of encrypted information through controlled *** can be easily read with a portable UV(365 nm)lamp and effectively erased using the white LED,thereby preventing information leakage and showing great potential for many applications.

关键词： Thermal vapor deposition Carbon nitride film Dynamic photoluminescence Encryption

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A review on additive manufacturing of ceramic matrix composites

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Journal of materials Science & technology 2023年第7期138卷 1-16页

作者： Jinxing Sun Daorong Ye Ji Zou Xiaoteng Chen Yue Wang Jinsi Yuan Haowen Liang Hongqiao Qu Jon Binner Jiaming Bai Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Metallurgy and Materials University of BirminghamB152TTUK State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Additive manufacturing(AM)of ceramic matrix composites(CMCs)has enabled the production of highly customized,geometrically complex and functionalized parts with significantly improved properties and functionality,compared to single-phase ceramic *** also opens up a new way to shape damage-tolerant ceramic composites with co-continuous phase reinforcement inspired by natural ***,a large variety of AM techniques has been successfully applied to fabricate CMCs,but variable properties have been obtained so *** article provides a comprehensive review on the AM of ceramic matrix composites through a systematic evaluation of the capabilities and limitations of each AM technique,with an emphasis on reported results regarding the properties and potentials of AM man-ufactured ceramic matrix composites.

关键词： Additive manufacturing Ceramic matrix composites 3D printing Mechanical properties Bioinspired composites

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Multiscale Anion-Hybrid in Atomic Ni Sites for High-Rate Water Electrolysis: Insights into the Charge Accumulation Mechanism

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Journal of the American Chemical Society 2024年第20期146卷 14194-14202页

作者： Li, Yan Peng, Yanan Dong, Wenda Jiang, Xueyu Lu, Lijun Yang, Dali Hsu, Liang-Ching Li, Wu Su, Baolian Lei, Aiwen Wuhan University Hubei Wuhan430072 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China National Chung Hsing University Taichung40227 Taiwan

Single-atom catalysts, characterized by transition metal-(N/O)4 units on nanocarbon (M-(N/O)4-C), have emerged as efficient performers in water electrolysis. However, there are few guiding principles for accurately controlling the ligand fields of single atoms to further stimulate the catalyst activities. Herein, using the Ni-(N/O)4-C unit as a model, we develop a further modification of the P anion on the outer shells to modulate the morphology of the ligand. The catalyst thus prepared possesses high activity and excellent long-term durability, surpassing commercial Pt/C, RuO2, and currently reported single-atom catalysts. Notably, mechanistic studies demonstrated that the pseudocapacitive feature of multiscale anion-hybrid nanocarbon is considerable at accumulating enough positive charge [Q], contributing to the high oxygen evolution reaction (OER) order (β) through the rate formula. DFT calculations also indicate that the catalytic activity is decided by the suitable barrier energy of the intermediates due to charge accumulation. This work reveals the activity origin of single atoms on multihybrid nanocarbon, providing a clear experiential formula for designing the electronic configuration of single-atom catalysts to boost electrocatalytic performance. © 2024 American Chemical Society.

关键词： Catalyst activity

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Effect of ball milling time on the microstructure and compressive properties of the Fe–Mn–Al porous steel

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International Journal of Minerals,Metallurgy and materials 2023年第5期30卷 917-929页

作者： Lingzhi Xie Zhigang Xu Yunzhe Qi Jinrong Liang Peng He Qiang Shen Chuanbin Wang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Wuhan Second Ship Design and Research Institute Wuhan 430205China

In the present work,Fe–Mn–Al–C powder mixtures were manufactured by elemental powders with different ball milling time,and the porous high-Mn and high-Al steel was fabricated by powder *** results indicated that the powder size significantly decreased,and the morphology of the Fe powder tended to be increasingly flat as the milling time ***,the prolonged milling duration had limited impact on the phase transition of the powder *** main phases of all the samples sintered at 640℃ were α-Fe,α-Mn and Al,and a small amount of Fe2Al5 and *** the sintering temperature increased to 1200℃,the phase composition was mainly comprised of γ-Fe and α-*** weight loss fraction of the sintered sample decreased with milling time,i.e.,8.3wt% after 20 h milling compared to15.3wt% for 10 *** Mn depletion region(MDR) for the 10,15,and 20 h milled samples was about 780,600,and 370 μm,*** total porosity of samples sintered at 640℃ decreased from ~46.6vol% for the 10 h milled powder to ~44.2vol% for 20 h milled *** sintering at 1200℃,the total porosity of sintered samples prepared by 10 and 20 h milled powder was ~58.3vol% and ~51.3vol%,*** compressive strength and ductility of the 1200℃ sintered porous steel increased as the milling time increased.

关键词： powder metallurgy porous steel ball milling time microstructure evolution compressive properties

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Unraveling the impacts of intermolecular interaction on morphology evolution for highly efficient organic solar cells and modules

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Science China Chemistry 2025年第1期68卷 264-272页

作者： Xueqing Ma Yingying Cheng Yuqiang Liu Xinming Zheng Guangliu Ran Hongxiang Li Xinyue Cui Andong Zhang Wenkai Zhang Pei Cheng Wenchao Huang Zhishan Bo Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China Key State Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu 610065China

Understanding the effect of intermolecular interaction on the growth dynamic of active layers is critical for advancing organic solar cells(OSCs).However,the diverse structure of donors and acceptors makes the research *** with customizable structures and properties could simplify this ***,we meticulously tailor two additives of 3,4-ethylenedioxythiophene(EDOT)and 2,5-dibromo-3,4-ethylenedioxythiophene(DBEDOT),possessing distinct intermolecular interaction features to elaborate the inherent *** is found that varied interaction strengths can alter film formation *** enhanced intermolecular interaction between the DBEDOT and non-fullerene acceptor BTP-e C9-4F results in pre-aggregation and longer crystallization duration of BTP-e C9-4F,facilitating the formation of films with compact molecular packing and decent phase ***,exciton dissociation and charge transport become more ***,devices processed with DBEDOT exhibit a remarkable power conversion efficiency of 19.35%in small-area OSCs and 14.11%in bladecoated 5 cm×5 cm organic solar ***,OSCs can maintain 80%of their initial efficiency after continuous annealing at 85℃for over 2,100 h.

关键词： organic solar cell non-fullerene acceptor film growth molecular packing intermolecular interaction

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Transformation of Undesired Li_(2)CO_(3)into Lithiophilic Layer Via Double Replacement Reaction for Garnet Electrolyte Engineering

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Energy & Environmental materials 2022年第3期5卷 962-968页

作者： Jiaxu Zhang Ruohan Yu Jun Li Huiyu Zhai Gangjian Tan Xinfeng Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Garnet-type solid-state electrolytes(SSEs)are a remarkable Li-ion electrolyte for the realization of next-generation all-solid-state lithium batteries due to their excellent stability against Li metal as well as high ionic conductivities at room ***,garnet electrolytes always contain undesired and hardly removable Li_(2)CO_(3) contaminations that have persistently large resistance and unstable interface contact with Li *** is a critical bottleneck for the practical application of garnet ***,we design a novel strategy to completely root out Li_(2)CO_(3) both inside and on the surface of *** is achieved by a so-called double replacement reaction between Li_(2)CO_(3) and SiO_(2) during one-step hot press process for garnet electrolyte *** leads to in-situ transformation of LixSiOy(LSO)mostly locating around the grain boundaries of *** to the higher ion conductivity and better electrochemistry stability of LSO than Li_(2)CO_(3),the modified garnet electrolyte shows much improved electrochemical ***,the wettability between modified garnet electrolyte and lithium metals was significantly enhanced in the absence of surface Li_(2)CO_(3).As a proof of concept,an assembled Li symmetric cell with modified garnet electrolyte displays a high critical current density(CCD)of 0.7 mA cm^(-2)and a low interfacial impedance(5Ωcm^(2))at 25℃.These results indicate that the upcycling of Li_(2)CO_(3)is a promising strategy to well-address the degradation and interfacial issue associated with garnet electrolytes.

关键词： double replacement reaction garnet electrolytes lithiophilic layer solid-state lithium batteries

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Polydopamine-assisted in-situ formation of dense MOF layer on polyolefin separator for synergistic enhancement of lithium-sulfur battery

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Nano Research 2022年第9期15卷 8048-8055页

作者： Xiuxiu Wu Cheng Zhou Chenxu Dong Chunli Shen Binbin Shuai Cheng Li Yan Li Qinyou An Xu Xu Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

The separator is of great significance to alleviate the shuttle effect and dendrite growth of lithium-sulfur ***,most of the current commercial separators cannot meet these requirements *** this work,a dense metal-organic-framework(MOF)modification layer is in-situ prepared by the assistant of polydopamine on the polypropylene *** to the unique structure and synergistic effect of polydopamine(PDA)and zeolitic imidazolate framework-8(ZIF-8),the functional separator can not only trap the polysulfides effectively but also promote the transport of lithium *** a result,the battery assembled with the functional separator exhibits excellent cycle *** capacity remains 711 mAh·g^(−1)after 500 cycles at 2 C,and the capacity decay rate is as low as 0.013%per *** symmetrical battery is cycled for 1,000 h at 2 mA·cm^(−2)(2 mAh·cm^(−2))with the plating/stripping overpotential of 20 *** the same time,the modification separator shows a higher lithium ion transference number(0.88),better thermal stability and electrolyte wettability than the unmodified separator.

关键词： metal-organic frameworks in-situ growth polysulfides shuttle effect gradient distribution

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