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Facile Fabrication of Ag Nanocrystals Encapsulated in Nitrogen-doped Fibrous Carbon as an Efficient Catalyst for Lithium Oxygen Batteries

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Energy & Environmental materials 2021年第2期4卷 239-245页

作者： Lili Liu tianyi ma Weiwei Fang Yuqing Liu Kostantin Konstantinov Jiazhao Wang Hua-Kun Liu School of Energy and Institute for Advanced materials Nanjing Tech UniversityJiangsu ProvinceNanjing 211816China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest BiomassCollege of Chemical EngineeringNanjing Forestry University(NFU)Nanjing 210037China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Intelligent Polymer Research Institute University of WollongongWollongong NSW 2522Australia Institute for Superconducting and Electronic materials University of WollongongWollongong NSW 2522Australia

A facile synthesis of Ag nanocrystals encapsulated in nitrogen-doped carbon fiber(NCF)is proposed,based on the simultaneous reaction between pyrrole and Ag^(+)ions in an aqueous solvent followed by a heat *** as-prepared Ag/NCF demonstrated superior catalytic behavior toward ORR and *** improved cycling stability,a much lower discharge/charge gap of 0.89 V(vs Li/Li^(+))compared with 1.38 V for NCF cathode with a fixed capacity of 500 m Ah g^(-1)was obtained in lithium oxygen *** introduction of Ag crystals into NCF facilitates the oxygen reduction reaction/oxygen evolution reaction kinetics.X-ray diffraction analysis coupled with Raman spectroscopy confirmed that Ag/NCF cathode could reversibly catalyze Li_(2)O_(2)formation and *** NCF matrix offers a conductive network to realize rapid mass transfer and the encapsulated Ag nanocrystals supplied effective catalytic active *** combined action between both contributes to the superior electrocatalytic performance.

关键词： Ag nanocrystals Li_(2)O_(2) Li–O_(2)batteries N-carbon fiber overpotential

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Source Apportionment Research of Fine Particulate matter in the Atmosphere by PAHs

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Chemical Research in Chinese Universities 2016年第5期32卷 746-753页

作者： WANG Ju YANG Le ma tianyi SUN Liyuan YU Liangui FANG Chunsheng Environmental Science Department College of Environment and Resources Jilin University Changchun 130012 P. R. China Key Laboratory of Groundwater Resources and Environment Ministry of EducationCollege of Environment and Resources Jilin University Changchun 130021 P. R. China College of Environmental Science and Engineering of Tong/i University Shanghai 200092 P. R. China Changchun Central Environmental Monitoring Station Changchun 130011 P. R. China

Haze weather frequently occurs in many cities in China. Polycyclic aromatic hydrocarbons（PAHs） in fine particulate matter（PM：.5） can adversely affect the environment and human health. In this paper, PM2.5 samples were collected at nine sites in a city in northeastern China from September 2013 to October 2014. Sixteen USEPA（US Evironment Protection Agency） priority PAHs in PM2.5 were analyzed to determine their spatial and temporal distri- bution characteristics. The source apportionment of PAHs was conducted with the Positive matrix Factorization（PMF） model. The results indicate that the concentrations of total PAHs（T-PAHs） in PM2.5 are within the range of 0.26 to 72.48 ng/m3. The seasonal variation of T-PAHs is winter〉spring〉autumn〉summer, and the space distribution of PAHs is JZP〉DP〉BFH〉LP〉EESA〉IPT〉CP〉HZMC〉JYP. In all types of PAils, three-ring and five-ring PAHs are signifi- cantly prominent（62%） in the heating period due to petrogenic sources and traffic emissions. Middle- and high-ring PAHs in the non-heating period are caused by coal combustion and vehicle exhaust, which accounts for 77% of the total emissions. The source apportionment results obtained by the diagnostic ratio of PAHs reflect that coal burning, traffic and other sources have a distinct influence on PAH emissions in this city. Six factors are defined by PMF v5.0, namely, coke oven emissions（7.7%）, biomass burning（44.3%）, petrogenic sources（10.7%）, coal combustion（10.4%）, gasoline engine emissions（16.7%）, and diesel engine emissions（10.3%）. The results indicate that the PAHs in PM2.5 in the city are primarily caused by combustion processes and vehicle exhaust.

关键词： Polycyclic aromatic hydrocarbon(PAH) Pollution characteristics Diagnostic ratio Positive matrix Factorization(PMF)

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Small moleculeπ-conjugated electron acceptor for highly enhanced photocatalytic nitrogen reduction of BiOBr

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Journal of materials Science & Technology 2022年第14期109卷 276-281页

作者： Derek Hao tianyi ma Baohua Jia Yunxia Wei Xiaojuan Bai Wei Wei Bing-Jie Ni Centre for Technology in Water and Wastewater(CTWW) School of Civil and Environmental EngineeringUniversity of Technology Sydney(UTS)SydneyNSW 2007Australia Centre for Translational Atomaterials Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthornVIC 3122Australia College of Chemistry and Chemical Engineering Lanzhou City UniversityLanzhou 730070China Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control Beijing University of Civil Engineering and ArchitectureBeijing 102612China

Artificial ammonia synthesis using solar energy is of great significance as it can help narrow the gap to the zero-net emission ***,the current photocatalytic activity is generally too low for mass ***,we report a novel bismuth bromide oxide(BiOBr)-Tetracyanoquinodimethane(TCNQ)photocatalyst prepared via a facile self-assembly *** to the well-match band structure of TCNQ and Bi OBr,the separation and transfer of photogenerated electron-hole pairs were significantly *** importantly,the abundant delocalizedπelectrons of TCNQ,and the electron-withdrawing property of TNCQ made electrons efficiently accumulated on the catalysts,which can strengthen the adsorption and cleavage of nitrogen *** a result,the photocatalytic activity increased *** highest ammonia yield of the optimized sample reached 2.617 mg/(h gcat),which was 5.6-fold as that of pristine BiOBr and higher than the reported BiOBr-based *** isotope labeled^(15)N_(2)was used to confirm that the ammonia is formed form the fixation of N_(2).Meanwhile,the sample also had good *** 4-time usage,the photocatalysts still had about 81.8%as the fresh *** results of this work provide a new way for optimizing the electronic structure of photocatalysts to achieve highly efficient photochemical N_(2) reduction.

关键词： BiOBr TCNQ Nitrogen reduction Electron accepter Photocatalysis。

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Metal-Free 2D/2D van der Waals Heterojunction Based on Covalent Organic Frameworks for Highly Efficient Solar Energy Catalysis

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Nano-Micro Letters 2023年第9期15卷 15-30页

作者： Ge Yan Xiaodong Sun Yu Zhang Hui Li Hongwei Huang Baohua Jia Dawei Su tianyi ma Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Adv.Mater.College of ChemistryLiaoning UniversityShenyang 110036People’s Republic of China School of Science RMIT UniversityMelbourneVIC 3000Australia Faculty of Science School of Mathematical and Physical SciencesUniversity of Technology SydneySydneyNSW 2007Australia Beijing Key Laboratory of materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083People’s Republic of China

Covalent organic frameworks(COFs)have emerged as a kind of rising star materials in ***,their photocatalytic activities are restricted by the high photogenerated electron-hole pairs recombination ***,a novel metal-free 2D/2D van der Waals heterojunction,composed of a two-dimensional(2D)COF with ketoenamine linkage(TpPa-1-COF)and 2D defective hexagonal boron nitride(h-BN),is successfully constructed through in situ solvothermal *** from the presence of VDW heterojunction,larger contact area and intimate electronic coupling can be formed between the interface of TpPa-1-COF and defective h-BN,which make contributions to promoting charge car-riers *** introduced defects can also endow the h-BN with porous structure,thus providing more reactive ***,the TpPa-1-COF will undergo a structural transformation after being integrated with defective h-BN,which can enlarge the gap between the conduction band position of the h-BN and TpPa-1-COF,and suppress electron backflow,corroborated by experimental and density functional theory calculations ***,the resulting porous h-BN/TpPa-1-COF metal-free VDW heterojunction displays out-standing solar energy catalytic activity for water splitting without co-catalysts,and the H_(2) evolution rate can reach up to 3.15 mmol g^(−1) h^(−1),which is about 67 times greater than that of pristine TpPa-1-COF,also surpassing that of state-of-the-art metal-free-based photocatalysts reported to *** particular,it is the first work for constructing COFs-based heterojunctions with the help of h-BN,which may provide new avenue for designing highly efficient metal-free-based photocatalysts for H_(2) evolution.

关键词： Covalent organic frameworks 2D/2D van der Waals heterojunction Metal-free photocatalyst

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Transition Metal Aluminum Boride as a New Candidate for Ambient-Condition Electrochemical Ammonia Synthesis

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Nano-Micro Letters 2020年第5期12卷 106-118页

作者： Yang Fu Peter Richardson Kangkang Li Hai Yu Bing Yu Scott Donne Erich Kisi tianyi ma Discipline of Chemistry School of Environmental and Life SciencesUniversity of NewcastleCallaghanNSW 2308Australia School of Engineering University of NewcastleCallaghanNSW 2308Australia CSIRO Energy 10 Murray Dwyer CircuitMayfield WestNSW 2304Australia School of Environmental Science and Engineering Fujian Normal UniversityFuzhou 350007FujianPeople’s Republic of China

Achieving more meaningful N2 conversion by reducing the energy input and carbon footprint is now being investigated through a method of N2 fixation instead of the Haber-Bosch ***,the electrochemical N2 reduction reaction(NRR)method as a rising approach currently still shows low selectivity(Faradaic efficiencymaB phases,is reported for the electrochemical NRR for the first time,at a low applied potential(-0.05 V versus RHE)under ambient conditions and in alkaline *** to the unique nano-laminated crystal structure of the maB phase,these inexpensive materials have been found to exhibit excellent electrocatalytic performances(NH3 yield:9.2μg h^-1cm^-2mgcat^-1.,Faradaic efficiency:30.1%)at the low overpotential,and to display a high chemical stability and sustained catalytic *** conjunction,further mechanism studies indicate B and Al as main-group metals show a highly selective affinity to N2 due to the strong interaction between the B 2p/Al 3p band and the N 2p orbitals,while Mo exhibits specific catalytic activity toward the subsequent reduction ***,the maB-phase catalyst under the synergy of the elements within ternary compound can suppress the hydrogen evolution reaction and achieve enhanced NRR *** significance of this work is to provide a promising candidate in the future synthesis of ammonia.

关键词： maB phase N2 reduction reaction Electrocatalysis Nanostructure

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First-row transition metal compounds for aqueous metal ion batteries

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Journal of Energy Chemistry 2021年第12期30卷 195-216,I0004页

作者： Mengmeng Zhou Xinjun Huang Xiaomeng Tian Baohua Jia Hongge Pan Wenping Sun Qin Zhao tianyi ma Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning ProvinceCollege of ChemistryLiaoning University.Shenyang 110036LiaoningChina Centre for Translational Atomaterials Swinburne University of TechnologyHawthornVIC 3122Australia Institute of Science and Technology for New Energy Xi'an Technological UniversityXi'an 710021ShaanxiChina School of materials Science and Engineering Stare Key Laboratory of Clean Energy UtilizationZhejiang University.Hangzhou 310027ZhejiangChina

In recent years,a series of aqueous metal ion batteries(AMIBs)has been developed to improve the safety and cost-efficiency of portable electronics and electric ***,the significant gaps in energy density,power density,and cycle stability of AMIBs directly hinder them from replacing the currently widely used non-aqueous metal ion batteries,which stems from the lack of reasonable configuration and performance optimization of electrode ***-row transition metal compounds(FRTMCs),with the advantages of optional voltage ranges(from low to high),adjustable crystal structures(layered and tunnel types with large spacing),and designable morphology(multi-dimensional nanostructures),are widely used to construct high-performance ***,no comprehensive review papers were generated to highlight their specific and significant roles in *** this review,we first summarize the superiority and characteristics of FRTMCs in ***,we put forward control strategies of FRTMCs from subsurface engineering to inner construction to promote capacitance control and diffusion control energy *** that,the electrochemical performance of the FRTMCs regulation strategies in AMIBs is ***,we present potential directions and challenges for further enhancements of FRTMCs in *** review aims to provide an in-depth understanding of regulation strategies for enhancing energy storage to build high-performance AMIBs that meet practical applications.

关键词： First-row transition metal Aqueous metal ion batteries Energy storage

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Pillar effect boosting the electrochemical stability of Prussian bluepolypyrrole for potassium ion batteries

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Nano Research 2023年第5期16卷 6326-6333页

作者： Mengmeng Zhou Xiaomeng Tian Ying Sun Xiaojun He Hui Li tianyi ma Qin Zhao Jieshan Qiu Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced materials of Liaoning Province Institute of Clean Energy ChemistryCollege of ChemistryLiaoning UniversityShenyang 110036China Anhui Key Laboratory of Coal Clean Conversion and High Valued Utilization Key Laboratory of Metallurgical Emission Reduction&Resources Recycling Ministry of EducationSchool of Chemistry and Chemical EngineeringAnhui University of TechnologyMaanshan 243002China School of Science RMIT UniversityMelbourne VIC 3000Australia State Key Laboratory of Chemical Resource Engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Due to the high theoretical capacity and electrode potential,Prussian blue is regarded as promising cathode material for potassium ion ***,inferior structural stability,poor electronic conductivity,ambiguous energy storage mechanism have limited the application of Prussian blue ***,a highly stable Prussian blue-polypyrrole(PB-PPY)composite has been prepared by a facile one-step ***-PPY displays higher discharging capacity,better rate capacity,and longer cycling lifespan than that of pure Prussian blue in potassium ion *** superior electrochemical performance can be attributed to the unique synthesis strategy to reduce the content of vacancies and crystal water in Prussian blue and enhance the ***,partial K ions have been evidenced that could remain in the Prussian blue framework,which contributes the long-term cycling *** K ions in the framework play the role of“pillars”to support the framework of Prussian blue and relieve the structural stress during the intercalation and de-intercalation of K *** work will reveal a new energy storage mechanism of Prussian blue and promote the design of high stability Prussian blue in the future.

关键词： Prussian blue high-stability framework pillar effect potassium ion batteries polypyrrole

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Study about thermal runaway behavior of high specific energy density Li-ion batteries in a low state of charge

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Journal of Energy Chemistry 2021年第1期30卷 20-27,I0002页

作者： Shiqiang Liu tianyi ma Zhen Wei Guangli Bai Huitian Liu Dapeng Xu Zhongqiang Shan Fang Wang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Evaluation Technology for Electric Vehicles China Automotive Technology and Research Center Co.Ltd.(CATARC)Tianjin 300300China

Lithium-ion batteries are widely used in electric vehicles and electronics, and their thermal safety receives widespread attention from consumers. In our study, thermal runaway testing was conducted on the thermal stability of commercial lithium-ion batteries, and the internal structure of the battery was analyzed with an in-depth focus on the key factors of the thermal runaway. Through the study of the structure and thermal stability of the cathode, anode, and separator, the results showed that the phase transition reaction of the separator was the key factor affecting the thermal runaway of the battery for the condition of a low state of charge.

关键词： Lithium-ion battery Thermal runaway State of charge Thermal stability

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Zinc Anode for Mild Aqueous Zinc-Ion Batteries: Challenges, Strategies, and Perspectives

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Nano-Micro Letters 2022年第3期14卷 32-78页

作者： Jinzhang Yang Bosi Yin Ying Sun Hongge Pan Wenping Sun Baohua Jia Siwen Zhang tianyi ma Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced materials of Liaoning Province Institute of Clean Energy ChemistryCollege of ChemistryLiaoning UniversityShenyang 110036People’s Republic of China Institute of Science and Technology for New Energy Xi’an Technological UniversityXi’an 710021People’s Republic of China State Key Laboratory of Clean Energy Utilization School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Centre for Translational Atomaterials Swinburne University of TechnologyHawthornVIC 3122Australia

The rapid advance of mild aqueous zinc-ion batteries(ZIBs)is driving the development of the energy storage system *** the thorny issues of Zn anodes,mainly including dendrite growth,hydrogen evolution,and corrosion,severely reduce the performance of *** commercialize ZIBs,researchers must overcome formidable *** about mild aqueous ZIBs is still *** technical and scientific obstacles to designing Zn anodes with high stripping efficiency and long cycling life have not been ***,the performance of Zn anodes is a complex scientific issue determined by various parameters,most of which are often ignored,failing to achieve the maximum performance of the *** review proposes a comprehensive overview of existing Zn anode issues and the corresponding strategies,frontiers,and development trends to deeply comprehend the essence and inner connection of degradation mechanism and ***,the formation mechanism of dendrite growth,hydrogen evolution,corrosion,and their influence on the anode are ***,various strategies for constructing stable Zn anodes are summarized and discussed in detail from multiple *** strategies are mainly divided into interface modification,structural anode,alloying anode,intercalation anode,liquid electrolyte,non-liquid electrolyte,separator design,and other ***,research directions and prospects are put forward for Zn *** contribution highlights the latest developments and provides new insights into the advanced Zn anode for future research.

关键词： Zn-ion batteries Zn metal anode Dendrite Hydrogen evolution Corrosion

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Decade Milestone Advancement of Defect-Engineered g-C_(3)N_(4) for Solar Catalytic Applications

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Nano-Micro Letters 2024年第4期16卷 153-218页

作者： Shaoqi Hou Xiaochun Gao Xingyue Lv Yilin Zhao Xitao Yin Ying Liu Juan Fang Xingxing Yu Xiaoguang ma tianyi ma Dawei Su School of mathematical and Physical Sciences Faculty of ScienceUniversity of Technology Sydney(UTS)SydneyNSW 2007Australia Laboratory of Plasma and Energy Conversion School of Physics and Optoelectronic EngineeringLudong University186 Middle Hongqi RoadYantai 264025People’s Republic of China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083People’s Republic of China Department of Chemistry The University of Tokyo7‑3‑1 HogoBunkyoTokyoJapan School of Science STEM CollegeRMIT UniversityMelbourneVIC 3000Australia

Over the past decade, graphitic carbon nitride(g-C_(3)N_(4)) has emerged as a universal photocatalyst toward various sustainable carbo-neutral technologies. Despite solar applications discrepancy, g-C_(3)N_(4) is still confronted with a general fatal issue of insufficient supply of thermodynamically active photocarriers due to its inferior solar harvesting ability and sluggish charge transfer dynamics. Fortunately, this could be significantly alleviated by the “all-in-one” defect engineering strategy, which enables a simultaneous amelioration of both textural uniqueness and intrinsic electronic band structures. To this end, we have summarized an unprecedently comprehensive discussion on defect controls including the vacancy/non-metallic dopant creation with optimized electronic band structure and electronic density, metallic doping with ultraactive coordinated environment(M–N_(x), M–C_(2)N_(2), M–O bonding), functional group grafting with optimized band structure, and promoted crystallinity with extended conjugation π system with weakened interlayered van der Waals interaction. Among them, the defect states induced by various defect types such as N vacancy, P/S/halogen dopants, and cyano group in boosting solar harvesting and accelerating photocarrier transfer have also been emphasized. More importantly, the shallow defect traps identified by femtosecond transient absorption spectra(fs-TAS) have also been highlighted. It is believed that this review would pave the way for future readers with a unique insight into a more precise defective g-C_(3)N_(4) “customization”, motivating more profound thinking and flourishing research outputs on g-C_(3)N_(4)-based photocatalysis.

关键词： Defect engineering g-C_(3)N_(4) Electronic band structures Photocarrier transfer kinetics Defect states

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