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Advanced charge transfer technology for highly efficient and long-lived TADF-type organic afterglow with near-infrared light-excitable property

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Science China Chemistry 2023年第4期66卷 1120-1131页

作者： Guangming Wang xuefeng Chen Jiahui Liu Shuhui ding Kaka Zhang Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China

Heavy atom effects and n-π*transitions have been frequently reported to enhance room-temperature organic phosphorescence efficiency but lead to shortage of phosphorescence lifetimes.Unlike these reported studies,we conceive the incorporation of advanced charge transfer(CT)technology to boost room-temperature organic afterglow efficiency and simultaneously maintain afterglow lifetimes.Here we design difluoroboronβ-diketonate(BF2bdk)CT compounds with moderate singlet-triplet splitting energy(ΔEST)of around 0.4 e V,and relatively large spin-orbit coupling matrix elements(SOCME(S_(1)-T_(1)),1–10 cm^(-1))to achieve efficient intersystem crossing(ISC)and moderate rates of reverse intersystem crossing(kRISC,1–10 s^(-1)).The advanced CT technology,which includes multiple electron-donating groups and orthogonal donor-acceptor arrangement,have been found to narrowΔESTand enhance both ISC and RISC.Meanwhile,the organic matrices suppress nonradiative decay of BF2bdk’s T1states by their rigid microenvironment.Consequently,thermally activated delayed fluorescence(TADF)-type organic afterglow materials can be achieved with afterglow efficiency up to 83.0%,long lifetimes of 433 ms,excellent processablility,as well as advanced anti-counterfeiting and information encryption.Furthermore,with the aid of up-conversion materials and through radiative energy transfer,TADF-type afterglow materials with aqueous dispersity and near-infrared light-excitable property have been achieved,which paves the way for biomedical applications.

关键词： afterglow charge transfer phosphorescence TADF triplet excited states

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Cascade Synthesis of Luminescent Difluoroboron Diketonate Compounds for Room-Temperature Organic Afterglow Materials

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Chinese Journal of Chemistry 2022年第21期40卷 2507-2515页

作者： Junbo Li Xuepu Wang Xiaoya Zhao xuefeng Chen Shuhui ding Minjian Wu Kaka Zhang College of Chemistry and Materials Science Sichuan Normal UniversityChengduSichuan 610068China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences345 Lingling RoadShanghai 200032China

Difluoroboronβ-diketonate(BF2bdk)compounds represent an important class of luminescent materials,whereas their synthesis requires multiple steps,which restrict their application in diverse fields.Here we report a cascade reaction to prepare BF2bdk from aromatic ketones,carboxylic acids,trifluoroacetic anhydride and boron trifluoride diethyl etherate.The cascade reaction is very simple and straightforward to produce BF2bdk with desired functional groups in reasonable isolation yields.Further,when some specific BF2bdk compounds are used as luminescent dopants,organic room-temperature phosphorescence with lifetimes>1.0 s and intense afterglow under ambient conditions can be achieved with the assistance by suitable organic matrices.The dopant-matrix materials exhibit excellent processability into desired patterns and large-area panels,and function as efficient donors of excited state energy transfer for the fabrication of red afterglow materials.

关键词： Afterglow Boron Luminescence Phosphorescence Photophysics

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Design and synthesis of novel 1,3-diene bridged chiral atropoisomeric diphosphine ligands for asymmetric hydrogenation ofα-dehydro amino ketones

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Science China Chemistry 2023年第10期66卷 2847-2851页

作者： xuefeng Tan Shuang Gao Chunyan Yang Qiwei Lang Xiaobing ding Gen-Qiang Chen Xumu Zhang Laboratory of Small Molecule Drug Discovery and Synthesis Department of ChemistrySouthern University of Science and TechnologyShenzhen 518055China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518000China Department of Chemistry City University of Hong KongHong Kong 999077China

A series of novel atropisomeric diphosphine ligands termed Tan Phos were designed and synthesized,which has a smaller bite angle compared with that of other ligands such as BINAP.Tan Phos showed high reactivity and enantioselectivity in the rhodiumcatalyzed asymmetric hydrogenation ofα-dehydro amino ketones,and up 99%yield and 99%ee were obtained for a wide range of chiralα-amino ketones.

关键词： diphosphine asymmetric hydrogenation chiral ligand

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Assessing the capacity of biochar to stabilize copper and lead in contaminated sediments using chemical and extraction methods

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Journal of Environmental Sciences 2019年第5期31卷 91-99页

作者： Mingming Wang Liangsuo Ren Dayang Wang Zuansi Cai xuefeng Xia Aizhong ding College of Water Sciences Beijing Normal University School of Engineering and the Built Environment Edinburgh Napier University

Because of its high adsorption capacity, biochar has been used to stabilize metals when remediating contaminated soils; to date, however, it has seldom been used to remediate contaminated sediment. A biochar was used as a stabilization agent to remediate Cu-and Pb-contaminated sediments, collected from three locations in or close to Beijing. The sediments were mixed with a palm sawdust gasified biochar at a range of weight ratios(2.5%, 5%, and 10%) and incubated for 10, 30, or 60 days. The performance of the different treatments and the heavy metal fractions in the sediments were assessed using four extraction methods, including diffusive gradients in thin films, the porewater concentration, a sequential extraction, and the toxicity characteristic leaching procedure. The results showed that biochar could enhance the stability of heavy metals in contaminated sediments. The degree of stability increased as both the dose of biochar and the incubation time increased. The sediment p H and the morphology of the metal crystals adsorbed onto the biochar changed as the contact time increased. Our results showed that adsorption,metal crystallization, and the p H were the main controls on the stabilization of metals in contaminated sediment by biochar.

关键词： Biochar Sediment Heavy metal Stabilization assessment

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论中国式现代化的伦理精神

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学习论坛 2023年第2期 28-35页

作者：丁雪枫国防大学政治学院上海201602

勤奋节约是中华民族的传统美德,人口众多、资源有限的中国式现代化内含了勤奋节约的美德要求;公平正义是人类孜孜不倦的价值追求,共同富裕的中国式现代化蕴含了公平正义精神;幸福生活是人们重要的价值目标,物质文明和精神文明相协调的... 详细信息

勤奋节约是中华民族的传统美德,人口众多、资源有限的中国式现代化内含了勤奋节约的美德要求;公平正义是人类孜孜不倦的价值追求,共同富裕的中国式现代化蕴含了公平正义精神;幸福生活是人们重要的价值目标,物质文明和精神文明相协调的中国式现代化内含了幸福生活的价值目标;和平互利是世界各国人民的共同向往,走和平发展道路的中国式现代化内含了和平互利的共同价值。加强中国式现代化的伦理精神研究,理论上对于进一步揭示中国式现代化的价值合理性、深化中国式现代化的学术研究,实践上对于凝聚民族精神、促进中国式现代化的实现等,具有积极意义。

关键词：勤奋节约公平正义幸福生活和平互利中国式现代化

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Nest-type NCM ■ Pt/C with oxygen capture character as advanced electrocatalyst for oxygen reduction reaction

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Journal of Energy Chemistry 2022年第8期31卷 304-312,I0009页

作者： Teng Chen Yida Xu Deming Meng xuefeng Guo Yan Zhu Luming Peng Jianqiang Hu Weiping ding Key Lab of Mesoscopic Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023JiangsuChina Department of Aviation Oil and Material Air Force Logistics AcademyXuzhou 221000Jiangsu.China

A unique nest-type catalyst has been designed with a nest of oxygen capture surrounding catalytic Pt centers, which shows much promoted performance, on the base of Pt/C catalyst, for oxygen reduction reaction(ORR). The nest is constructed with nitrogen-doped carbon matrix(NCM), derived from the controlled carbonization of PANI precursor, to cover Pt/C catalyst. The unique structure of the catalyst(denoted as NCM■ Pt/C) has many merits. Firstly, it can capture oxygen both in air and in acidic electrolyte. Compared with naked Pt/C, it is found that, in air, the oxygen concentration within the porous nest of NCM surrounding Pt/C particles is ~13 times higher than atmospheric oxygen concentration and, in acidic electrolyte, the concentration of activated oxygen over the catalyst NCM■ Pt/C rise to~1.9 times. Secondly, the NCM nest offers a special electronic modulation on Pt centers toward modified ORR kinetics and then catalytic performances. With these merits, compared with Pt/C, the NCM■ Pt/C catalyst shows 3.2 times higher turnover frequency value and 2.9 times enhanced specific activity for ORR with half-wave potential at 0.894 V. After 50,000 sweeping cycles, the NCM■ Pt/C catalyst retains~66% mass activity and still has advantages over the fresh Pt/C catalyst. We envision that the nest-type catalyst provides a new idea for progress of practical Pt/C ORR catalyst.

关键词： Oxygen reduction reaction Surrounding environment Nest-type catalyst Oxygen capture Electronic modulation

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论共同富裕的伦理精神

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学习论坛 2022年第2期38卷 115-121页

作者：丁雪枫中国人民解放军国防大学政治学院上海201602

共同富裕的经济性、共同性、渐进性从不同维度促生了共同富裕的伦理精神。道德是经济关系的反映,共同富裕最基本的是经济富裕,共同富裕的经济性揭示了道德深厚的物质基础。关切人是伦理学的基本使命,共同富裕不仅在物质生活上关心每一个... 详细信息

共同富裕的经济性、共同性、渐进性从不同维度促生了共同富裕的伦理精神。道德是经济关系的反映,共同富裕最基本的是经济富裕,共同富裕的经济性揭示了道德深厚的物质基础。关切人是伦理学的基本使命,共同富裕不仅在物质生活上关心每一个人,而且在精神生活上尊重每一个人,共同富裕的共同性关切了每一个个体的价值尊严。渐进性共同富裕具有的民族必然性进一步激发了共同富裕的民族进取精神。加强对共同富裕伦理精神的探讨,理论上对于深化共同富裕的价值合理性研究,实践上对于振奋民族精神、实现美好生活等,具有重要意义。

关键词：共同富裕伦理精神道德

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基于“以旧换再”和消费者细分的制造商决策模型

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系统工程理论与实践 2020年第4期40卷 951-963页

作者：高攀丁雪峰三峡大学经济与管理学院宜昌443002

在以旧换再背景下,针对消费者细分市场(同时存在原始消费者和新晋消费者),研究制造商的生产与定价策略.首先,根据两类消费者的选择行为,提出了五种市场需求结构;在此基础上,构建了制造商的五种决策模型,并提出了各决策模型的最优生产与... 详细信息

在以旧换再背景下,针对消费者细分市场(同时存在原始消费者和新晋消费者),研究制造商的生产与定价策略.首先,根据两类消费者的选择行为,提出了五种市场需求结构;在此基础上,构建了制造商的五种决策模型,并提出了各决策模型的最优生产与定价策略;其次,以原始消费者所占市场比例为分析变量,对制造商五种最优策略进行了比较分析,并提出了制造商的最佳策略选择边界.研究结果表明当两类消费者均对再制造产品有需求时,制造商可以获得最大市场份额;而制造商对最佳生产与定价策略的选择取决于分析变量的取值范围以及取值边界的大小关系.最后,采用数值仿真对上述结论的有效性进行了验证.

关键词：以旧换再消费者细分决策模型生产策略定价策略

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论共同富裕视域下的道德观念

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广西社会科学 2022年第4期 86-92页

作者：丁雪枫中国人民解放军国防大学政治学院上海201602

培育与共同富裕相适应的道德观念,是澄清共同富裕中关于道德认识的误区,如“道德无用论”与“道德万能论”误区的需要;是破解共同富裕中不良道德的阻碍,如为富不仁、“躺平”为善、以穷为荣等观念的需要;也是为全体人民实现共同富裕提... 详细信息

培育与共同富裕相适应的道德观念,是澄清共同富裕中关于道德认识的误区,如“道德无用论”与“道德万能论”误区的需要;是破解共同富裕中不良道德的阻碍,如为富不仁、“躺平”为善、以穷为荣等观念的需要;也是为全体人民实现共同富裕提供精神动力的需要。自我要求的勤俭和创新观念、对待他人的慷慨大方观念、社会自身的公平正义观念等是实现共同富裕过程中应树立的道德观念。这些观念不仅具有理论合理性,而且具有现实可行性:仁爱友善的民族基因为与共同富裕相适应的道德观念的实践、推进共同富裕等奠定中华传统文化基础;典型人物的社会示范表明共同富裕视域下的道德观念在现实社会中已经被一些人践行,其在现实中是可行与可能的,有利于进一步推动共同富裕,实现人的自由全面发展;宣传媒体的舆论引导可以通过潜移默化的方式让人们从内心中感受到精神观念的力量与价值,并通过宣扬和批判两条途径的共同作用,促进勤俭和创新、慷慨大方、公平正义观念的确立,推进共同富裕的早日实现。

关键词：共同富裕道德观念价值合理性仁爱友善勤俭创新公平正义慷慨大方

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Rational design of 3D porous niobium carbide MXene/rGO hybrid aerogels as promising anode for potassium-ion batteries with ultrahigh rate capability

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Nano Research 2023年第2期16卷 2463-2473页

作者： Cong Liu Zhitang Fang Xiaoge Li Jinhua Zhou Gang Yang Luming Peng xuefeng Guo Weiping ding Wenhua Hou Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Suzhou Key Laboratory of Functional Ceramic Materials Changshu Institute of TechnologyChangshu 215500China

An effective method is designed to construct three-dimensional(3D)Nb_(2)C/reduced graphene oxide(rGO)hybrid aerogels through a low-temperature graphene oxide(GO)-assisted hydrothermal self-assembly followed by freeze-drying and annealing.The intimately coupled Nb_(2)C/rGO hybrid aerogel combines the advantages of large specific surface area and rich 3D interconnected porous structure of aerogel as well as high conductivity and low potassium diffusion energy barrier of Nb_(2)C,which not only effectively prevents the self-restacking of Nb2C nanosheets to allow more active sites exposed and accommodate the volume change during the charge/discharge process,but also increases the accessibility of electrolyte and promotes the rapid transfer of ions/electrons.As a result,Nb_(2)C/rGO-2 as the anode of potassium ion batteries(KIBs)delivers a large reversible specific capacity(301.7 mAh·g^(−1)after 500 cycles at 2.0 A·g^(−1)),an ultrahigh rate capability(155.5 mAh·g^(−1)at 20 A·g^(−1)),and an excellent long-term large-current cycle stability(198.8 mAh·g^(−1)after 1,000 cycles at 10 A·g^(−1),with a retention of 83.3%).Such a high-level electrochemical performance,especially the ultrahigh rate capability,is the best among transition metal carbides and nitride(MXene)-based materials reported so far for KIBs.The diffusion kinetics of K+is investigated thoroughly,and the synergetic charge–discharge mechanism and the structure–performance relationship of Nb_(2)C/rGO are revealed explicitly.The present work provides a good strategy to solve the self-restacking problem of two-dimensional materials and also enlarges the potential applications of MXenes.

关键词： niobium-based transition metal carbides(Nb_(2)C MXene) reduced graphene oxide(rGO) hybrid aerogel potassium ion batteries ultrahigh rate capability

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