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Electron donor–acceptor (D-A) tuning to achieve soluble covalent organic polymers for optoelectronic devices

eScience 2023年第1期3卷 53-61页

作者： Xueli Li Xianjin Yue Yifei Wang Tengge Chen Yihui Zhou Di Liu Hengyang Xiang Shengli Zhang Haibo Zeng Zhonghua Xiang State Key Laboratory of organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029PR China MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics and NanomaterialsSchool of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094PR China

covalent organic polymers(COPs)have emerged as a unique class of luminescent polymers with pre-designed quasi-ordered ***,their layered stacks and limited solubility preclude further processing for large-scale applications in devices,especially optoelectronic ***,a universal strategy to adjust the electron donor–acceptor(D-A)moieties of the building blocks in COPs is proposed,achieved by in situ charge exfoliation of COP blocks into few-layer true solutions in(Lewis)acid and base *** electron D-A moieties of the building blocks endow the COPs with the ability to accept or donate electrons,by altering the electron cloud distribution as well as the relative energy levels of the frontier molecular *** resultant soluble COPs can easily be processed into a uniform film by solution processing via the spin-coat *** obtained COP-N achieves efficient and stable perovskite electroluminescence as a novel hole injection material on indium tin oxide,and the operating lifetime for a perovskite quantum dot light-emitting diodes device exceeds that of a poly(ethylene dioxythiophene):polystyrene sulphonate *** straightforward electronic regulation strategy provides a new avenue for the rational synthesis of processable reticular molecular polymers for practical electronic devices.

关键词： covalent organic polymers Electron donor-acceptor(D-A)moieties In situ charge exfoliation Solution processing

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covalent organic polymers(COPS):synthesis, design and clean energy application

Covalent Organic Polymers(COPS):synthesis, design and clean ...

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中国化学会第30届学术年会-第三十六分会：纳米材料合成与组装

作者： Jianing Guo Yuanhui Cheng Zhonghua Xiang Department of Chemical Engineering Beijing University of Chemical Technology

The unique structure and properties make graphene very promise for a wide range of potential applications, including energy storage and conversion, electronics, sensors, and electrocatalysis[1-3]. Similar to grapheme, we developed series of covalent organic polymers(COPs), which were constructed from covent bonds(C-C coupling) between the ever-changing organic linkers by homo- or hetero-polymerization[4, 5]. Moreover, we have developed a class of covalent organic polymers(COPs) incorporating a metal(such as Fe, Co, Mn) with precisely controlled locations of nitrogen heteroatoms and holes were synthesized from various N-containing metal–organic complexes[2, 6]. Owing to their high porosity, precisely-controlled molecular structures and multi-functionalities, COPs hold great potential for efficient energy conversion and storage, particularly as efficient metal-free electrocatalysts for oxygen reduction reaction(ORR) in fuel cells[1, 5, 7]. As to the energy storage, the synthesized N-CPAF-1 possesses large capacitance(385 F/g) and excellent performance stability without any loss in capacitance after 9000 charge–dischargecycles[8].

关键词： covalent organic polymers energy conversion and storage oxygen reduction reaction electrocatalyst

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Pyrolysis-free covalent organic polymers for electrocatalysis

Pyrolysis-free Covalent organic polymers for electrocatalysi...

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中国化学会第十九届全国催化学术会议

作者： Peng Peng Yuanhui Cheng Zhonghua Xiang State Key Lab of organic–Inorganic Composites Beijing University of Chemical Technology

＜正＞Highly efficient electrocatalysts are vital to meet the energy and environmental challenges. Although numerous nonprecious-metal or metal-free carbon-based catalysts have been demonstrated to entirely or partially replace noble-metal-based electrocatalysis, the absence of precise design and predictable process hindered the development.

关键词： covalent organic polymers ORR OER

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Electron push-pull effects induced performance promotion in covalent organic polymer thin films-based memristor for neuromorphic application

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Chinese Chemical Letters 2024年第5期35卷 227-231页

作者： Panke Zhou Hong Yu Mun Yin Chee Tao Zeng Tianli Jin Hongling Yu Shuo Wu Wen Siang Lew Xiong Chen State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

covalent organic polymer(COP)thin film-based memristors have generated intensive research interest,but the studies are still in their ***,by controlling the content of hydroxyl groups in the aldehyde monomer,Py-COP thin films with different electronic push-pull effects were fabricated bearing distinct memory performances,where the films were prepared by the solid-liquid interface method on the ITO substrates and further fabricated as memory devices with ITO/Py-COPs/Ag *** Py-COP-1-based memory device only exhibited binary memory behavior with an ON/OFF ratio of 1:10^(1.87).In contrast,the device based on Py-COP-2 demonstrated ternary memory behavior with an ON/OFF ratio of 1:10^(0.6):10^(3.1) and a ternary yield of 55%.The ternary memory mechanism of the ITO/Py-COP-2/Ag memory device is most likely due to the combination of the trapping of charge carriers and conductive ***,the Py-COPs-based devices can successfully emulate the synaptic potentiation/depression behavior,clarifying the programmability of these devices in neuromorphic *** results suggest that the electronic properties of COPs can be precisely tuned at the molecular level,which provides a promising route for designing multi-level memory devices.

关键词： covalent organic polymers Push-pull effects Multi-level memory Memristor

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One-pot synthesis of mesosilica/nano covalent organic polymer composites and their synergistic effect in photocatalysis

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Chinese Journal of Catalysis 2021年第10期42卷 1821-1830页

作者： Chengbin Li He Li Chunzhi Li Xiaomin Rena Qihua Yang State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

organic-inorganic hybrid materials provide a desirable platform for the development of novel functional ***,we report the one-pot synthesis of mesoporous hybrid nanospheres by the in-situ sol-gel condensation of tetraethoxysilane around surfactant micelle-confined nano covalent organic polymer(nanoCOP)*** hybrid nanospheres containing nanoCOPs uniformly distributed in the mesosilica network,inherited the visible light responsive properties of the *** turnover frequency of the hybrid nanospheres is almost 12 times that of its corresponding bulk COP counterpart for the photocatalytic reductive dehalogenation of a-bromoacetophenone,which is attributed to activation of the Hantzsch ester reductant by the hydroxyl *** existence of a volcano relationship between the activity and nano COP/mesosilica ratio confirmed the synergistic effect between nano COP and *** preliminary results suggest that hybridization of semiconductors and reactant-activating materials is an efficient strategy for enhancing the activity of a catalyst for photocatalysis.

关键词： covalent organic polymers Mesoporous silica Hybrid materials Synergy effect Photocatalysis Reductive dehylogenation reaction

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Microfluidic interface boosted synthesis of covalent organic polymer capsule

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Green Chemical Engineering 2020年第1期1卷 63-69页

作者： Yun Zhao Min Zhang Xin Wen Zhonghua Xiang State Key Laboratory of organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029PR China

Microcapsules have been widely used in drug carriers,nano/microreactors,artificial organelles for their empty space and functional *** synthesized from spherical liquid-liquid interface show ultrathin shell and large ***,spherical liquid-liquid interfaces generated by stirring or sonicating are difficult in controlling the droplet size and preventing their coalescence,which results in inhomogeneous ***,we demonstrate a microfluidic interfacial synthetic method to produce microcapsules using the hot covalent organic polymers(COPs)coupled with Schiff-base reaction.A very high throughput of uniform and individual microdroplets about~1400 min^(-1)was generated under high flow rate for COP capsules *** catalyst promoted amine and aldehyde condensation that reacted less than 1 s assured the polymerization occurred at the liquid-liquid interface regardless of the diffusion intensification in microfluidic *** capsules with shell thickness around 50 nm were flexible enough to response to slight interior capillary force and exterior filtration force to form origami structure and sealed flat membrane,*** of the interfacial synthesized capsule expressed large capacity by encapsulating 1.41×10^(-2)μg SiO_(2)nanoparticles as theoretically ***,these properties make the COP capsules promising in,but not limited to,fast drug delivery and microreactors.

关键词： covalent organic polymers Microcapsules Interfacial synthesis Microfluidic system High throughput

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