Article
Chemistry, Multidisciplinary
Derong Luo, Jing Zhang, Huizi Zhao, Hai Xu, Xiaoyu Dong, Langyuan Wu, Bing Ding, Hui Dou, Xiaogang Zhang
Summary: A two-dimensional covalent organic framework (NTCDI-COF) with rich redox active sites, high stability, and crystallinity was designed and prepared. As a cathode material for lithium-ion batteries (LIBs), NTCDI-COF exhibits excellent electrochemical performance with an outstanding discharge capacity of 210 mA h g(-1) at 0.1 A g(-1) and high capacity retention of 125 mA h g(-1) after 1500 cycles at 2 A g(-1). A two-step Li+ insertion/extraction mechanism is proposed based on ex situ characterization and density functional theory calculation. The constructed NTCDI-COF//graphite full cells can realize good electrochemical performance.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yu-Qing Cai, Zhi-Ting Gong, Qian Rong, Jia-Ming Liu, Li-Feng Yao, Fei-Xiang Cheng, Jian-Jun Liu, Shu-Biao Xia, Hong Guo
Summary: In this study, a DCB triazine-based COF was synthesized using 1,4-DCB as a lithium-ion battery anode material. The lithium storage mechanism of the DCB-COF was investigated through various experiments and calculations. The results showed that the DCB-COF exhibited high storage capacity and cycling stability. This work provides an effective strategy for the fabrication of novel COF electrode materials.
APPLIED SURFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Lu Zhao, Lu Zheng, Xiaopeng Li, Han Wang, Li-Ping Lv, Shuangqiang Chen, Weiwei Sun, Yong Wang
Summary: The COF-Co material, as an organic electrode for potassium ion batteries, shows enhanced cycling stability and good rate properties due to its enhanced pi-pi accumulation and abundant defects, as well as the promotion of pi-K+ interaction and shortened diffusion distance of ion/electron.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Tian Xia, Zhuangzhuang Wu, Ying Liang, Wenxin Wang, Yongpeng Li, Xinlong Tian, Lijuan Feng, Zhuyin Sui, Qi Chen
Summary: In this study, a sulfonic group-containing COF was prepared as a modified separator in lithium-sulfur batteries. The COF-SO3 cell showed higher ionic conductivity and excellent electrochemical performance, inhibiting the shuttle effect of polysulfides and promoting Li+ diffusion. Furthermore, COF-SO3 was used as an electrocatalyst for the oxygen evolution reaction, exhibiting low overpotential and exceptional stability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Pengyue Li, Haowei Lv, Zhonglin Li, Xueping Meng, Zhang Lin, Ruihu Wang, Xiaoju Li
Summary: This study proposes a new strategy to regulate the redox kinetics and shuttle effect of polysulfides by modifying a polypropylene separator with a coating layer of guanidinium-based ionic-covalent organic nanosheets (iCON) on the surface of Ti3C2. The synergistic effects of Ti3C2 and iCON effectively suppress the shuttle effect of polysulfides and accelerate the redox reactions of sulfur species, resulting in high-performance lithium-sulfur batteries.
ADVANCED MATERIALS
(2021)
Review
Polymer Science
Yuancheng Wang, Yingjie Zhao, Zhibo Li
Summary: In the context of the energy crisis and global warming, developing clean and sustainable energy through photocatalytic processes is gaining attention. Organic porous polymers, particularly covalent organic frameworks (COFs), have emerged as promising photocatalysts due to their high crystallinity, porosity, and structural designability.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Review
Chemistry, Multidisciplinary
Ravinder Kumar, Shagufi Naz Ansari, Rakesh Deka, Praveen Kumar, Mohit Saraf, Shaikh M. Mobin
Summary: Covalent-organic frameworks (COFs) as a new member of the crystalline porous materials family have emerged as important materials for energy storage/conversion/generation devices, thanks to their high surface areas, ordered micro/mesopores, designable structures, and ability to precisely control electro-active groups in their pores which broaden their application window. They have been found suitable for a range of challenging electrochemical applications due to their low weight density, long range crystallinity, reticular nature, and tunable synthesis approach towards two and three dimensional (2D and 3D) networks.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Review
Polymer Science
Liting Yang, Ning Huang
Summary: Developing renewable clean energy is urgent, and COFs have attracted extensive attention as a new kind of crosslinked polymers with great potential in the energy field. This review introduces the design principle of COFs in lithium batteries and summarizes their application in lithium ion and lithium sulfur batteries. The remaining challenges and perspectives are discussed, along with possible future directions for the development of lithium batteries.
JOURNAL OF POLYMER SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Enbo Zhou, Xiang Zhang, Lei Zhu, Daqiang Yuan, Yaobing Wang
Summary: This article introduces a crystalline mesoporous covalent organic framework (TA-PT COF) with triphenylamine and perylenetetracarboxylic diimide units, which functions as an efficient photoelectrochemical cathode in a reversible aqueous solar-responsive battery. The COF exhibits a molecule-level coupling of intramolecular charge separation and reversible redox chemistry, leading to reliable voltage-response, high efficiency, and good light durability.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Polymer Science
Tiago F. Machado, M. Elisa Silva Serra, Dina Murtinho, Artur J. M. Valente, Mu Naushad
Summary: Covalent Organic Frameworks are a new class of microporous polymers with unprecedented properties, offering promising solutions in a vast number of fields. By strategically combining monomers with specific structures and properties, COF materials can be fine-tuned and controlled, allowing for post-synthetic functionalization.
Review
Chemistry, Inorganic & Nuclear
Changlei Xia, Kent O. Kirlikovali, Thi Hong Chuong Nguyen, Xuan Cuong Nguyen, Quoc Ba Tran, Minh Khoa Duong, Minh Tuan Nguyen Dinh, Dang Le Tri Nguyen, Pardeep Singh, Pankaj Raizada, Van-Huy Nguyen, Soo Young Kim, Laxman Singh, Chinh Chien Nguyen, Mohammadreza Shokouhimehr, Quyet Van Le
Summary: COFs have emerged as potential materials for solar fuel production, offering solutions to issues such as poor light absorption, fast photogenerated electron-hole recombination, and inappropriate active sites. This review investigates the development of COFs for producing hydrogen, carbon dioxide reduction, and dinitrogen fixation, highlighting current limitations in the field of photocatalysis.
COORDINATION CHEMISTRY REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Zijun Yong, Tianyi Ma
Summary: This article provides a systematic overview of the advances and challenges of covalent organic frameworks (COFs) in photocatalytic H2O2 production and offers perspectives and outlooks for future developments in this field.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Qianqian Yan, Shanshan Tao, Ruoyang Liu, Yongfeng Zhi, Donglin Jiang
Summary: Helicenes are fascinating chiral helical molecules with rich chemistry. Although research on synthesizing helicenes with increased numbers of aromatic rings and complex heterostructures has been conducted over the past century, the study of inorganic, organic, and polymeric helicene materials is still in its early stages.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Xuxu Tang, Li-Ping Lv, Shuangqiang Chen, Weiwei Sun, Yong Wang
Summary: In this study, a layer-assembled hollow microspherical structure of Sn@COF-hollow electrode was designed to enhance the application performance of covalent organic framework materials in lithium-ion batteries, improving the electrode's cycling performance and rate capability. By effectively combining inorganic metal and organic framework components, the electrode's conductivity and lithium storage properties were promoted.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Review
Chemistry, Multidisciplinary
Jiwei Wang, Kaixi Wang, Yuxi Xu
Summary: Lithium metal anodes have high theoretical capacity and low electrochemical potential, but their commercial development is hindered by unstable solid electrolyte interphases and uncontrollable lithium dendrite growth. Emerging 2D polymers have shown great advantages in addressing these issues, offering insights into developing high-energy-density lithium metal batteries.
Article
Chemistry, Physical
Xueli Li, Yujia Liu, Zhonghua Xiang
Summary: The rational regulation of the oxygen reduction catalytic activity of transition metal/nitrogen-doped carbon is important for sustainable energy conversion devices. In this study, a series of covalent organic frameworks with dithiine bridges were designed and the effect of dithiine on oxygen reduction was studied. The results showed that the introduction of dithiine can improve the catalytic activity by modifying the electronic structure of the metal atoms.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Minghang Jiang, Linkai Han, Peng Peng, Yi Hu, Yan Xiong, Chunxia Mi, Zuoxiu Tie, Zhonghua Xiang, Zhong Jin
Summary: The study presents a pyrolysis-free approach to incorporate ordered quasi-phthalocyanine N-coordinated transition metal centers into a 2D covalent organic framework for enhanced NRR performance. Among the Ti, Cu, and Co variants, Ti-COF exhibited superior NRR activity due to its ability to activate N-2 molecules and suppress HER. This work demonstrates the potential of 2D-COF materials with coordinated transition metal centers for efficient electrocatalytic NRR.
Article
Chemistry, Applied
Qingbin Liu, Li Xu, Shizhen Liu, Zhonghua Xiang
Summary: The hierarchically porous Fe-N-C structure prepared using a binary ligand strategy shows excellent durability and high current retention, outperforming benchmark catalysts. The catalyst also demonstrates a promising maximum power density in proton exchange membrane fuel cells, indicating significant implications for various electrochemical reactions.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Xueli Li, Di Liu, Qingbin Liu, Zhonghua Xiang
Summary: A bifunctional oxygen catalyst is developed via a pyrolysis-free approach based on closed pi-conjugated covalent organic polymers (COPs). The catalyst possesses precise configuration and high repeatability, allowing large-scale production. It exhibits high bifunctional activity and long cycle stability even after scale synthesis, surpassing conventional pyrolytic M-N-C catalysts.
Article
Chemistry, Applied
Yiming Leng, Bolong Yang, Yun Zhao, Zhonghua Xiang
Summary: In this study, fluorinated iron and cobalt bimetallic nanoparticles were successfully prepared on nitrogen-doped carbon nanofibers, leading to improved activity and stability of non-precious metal electrocatalyst. The fluorination increased the charge density of the bimetallic catalyst and showed remarkable catalytic performance under acidic conditions.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Xueli Li, Qingbin Liu, Bolong Yang, Zhijian Liao, Wensheng Yan, Zhonghua Xiang
Summary: The study presents a novel F-decorated covalent organic polymer as an electrocatalyst for acidic oxygen reduction reaction (ORR), which enhances the performance of the catalyst in proton-exchange-membrane fuel cells (PEMFCs) by altering the electronic structure of active sites.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Bolong Yang, Qing Han, Linkai Han, Yiming Leng, Thomas O'Carroll, Xiaoxuan Yang, Gang Wu, Zhonghua Xiang
Summary: Nitrogen-coordinated single-cobalt-atom electrocatalysts have emerged as a new frontier in the design of oxygen reduction cathodes in polymer electrolyte fuel cells. This study demonstrates the direct preparation of a highly stable cross-linked nanofiber electrode with atomic Co active sites fully dispersed on the catalyst surface.
ADVANCED MATERIALS
(2023)
Article
Engineering, Chemical
Yun Zhao, Xiaogang Yu, Xin Wen, Yong Luo, Zhonghua Xiang, Jian-feng Chen
Summary: The scale-up synthesis of covalent organic frameworks (COFs) with uniform structure and properties is achieved using high-gravity intensified synthesis. The formation of COFBTC is improved synergically by alcoholic solvent and basic catalyst. High concentration and reaction temperature are beneficial for high production. The intensified mass and heat transfer at high-gravity promotes the scaling-up of COFBTC with homogeneous structures and properties.
Review
Chemistry, Physical
Bolong Yang, Bingjie Li, Zhonghua Xiang
Summary: Metal-organic frameworks (MOFs) have gained significant attention for their diverse structures, favorable porous properties, and tunable chemical compositions. In the field of electrochemical energy storage and conversion, MOF-based materials play a crucial role due to their ability to regulate chemical composition at the molecular level and their highly porous frameworks for facilitating mass and charge transfer. This review discusses the strategies for designing targeted MOF-based materials and their potential applications in supercapacitors and electrocatalytic oxygen reduction reaction (ORR).
Article
Chemistry, Multidisciplinary
Xueli Li, Tengge Chen, Bolong Yang, Zhonghua Xiang
Summary: The traditional pyrolysis method leading to structural diversity of active sites hinders our understanding of the local coordination environment and its effects on the performance of the oxygen reduction reaction (ORR). We utilized covalent organic polymers (COPs) to define a series of FeN4 active-site configurations via a pyrolysis-free approach. Our results indicate a higher positive charge on iron atoms near an electron-withdrawing side-chain, achieved through dz2 orbital tuning in a COPBTC@Cl-CNTs catalyst, resulting in a high-valence configuration (FeH+N4). We introduced a new descriptor, xi, as the band center of iron atoms projected on the 3dz2 orbital to quantitively explain a volcano-like regulation mechanism. The catalytic performance of the COPBTC@Cl-CNTs electrocatalyst is optimized when xi is distributed between -1.887 and -1.862 eV.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Bolong Yang, Haifeng Yu, Xudong Jia, Qian Cheng, Yaoliang Ren, Bing He, Zhonghua Xiang
Summary: By constructing Fe-Ce atomic pairs, the adsorption structure is changed and the linear relationship between catalytic activity and adsorption energy of reaction intermediates based on single-metal sites is broken, leading to excellent oxygen reduction reaction (ORR) performances of the FeCe-SAD/HPNC catalyst.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Chunxia Mi, Haifeng Yu, Linkai Han, Lirong Zhang, Lingling Zhai, Xueli Li, Yujia Liu, Zhonghua Xiang
Summary: A two-dimensional covalent organic polymer catalyst with well-defined four-nitrogen coordination structure is developed through a pyrolysis-free strategy. The catalyst exhibits excellent activity for oxygen electrocatalysis by balancing the charge environment and regulating the adsorption of oxygen species. Zn-air batteries assembled with this catalyst show stable high power density.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Linkai Han, Haifeng Yu, Zhonghua Xiang
Summary: Transition metal-nitrogen-carbon materials with asymmetric MN4 sites based on the 3-s-triazine of g-C3N4 are proposed as promising catalysts for oxygen evolution reaction (OER). Compared to symmetric active sites, the asymmetric MN4 sites directly modulate the oxygen species adsorption, leading to higher OER intrinsic activity. In Silico screening suggests that cobalt has the best OER activity among familiar nonprecious transition metals. Experimental results show that the intrinsic activity of asymmetric active sites is enhanced by 48.4% compared to the symmetric ones, and a-CoN4@NC exhibits excellent activity as an OER catalyst in an alkaline water electrolyzer device.
Article
Engineering, Chemical
Bolong Yang, Xiaogang Yu, Jingkui Hou, Zhonghua Xiang
Summary: Based on the volcanic relationship between catalytic activity and key adsorption energies, Pt-Co alloys have been extensively studied as cathode oxygen reduction reaction catalysts in proton exchange membrane fuel cells. However, balancing the alloying degree and ORR performance of Pt-Co catalyst remains a great challenge.
Article
Multidisciplinary Sciences
Linjie Zhao, Qifeng Cai, Baoguang Mao, Junjie Mao, Hui Dong, Zhonghua Xiang, Jia Zhu, Rajib Paul, Dan Wang, Yongde Long, Liangti Qu, Riqing Yan, Liming Dai, Chuangang Hu
Summary: A molecular design and carbon dot confinement coupling strategy is proposed for the synthesis of dual-metal-atom sites in carbon dots (DMASs-CDs) through the pyrolysis of a bimetallic complex. Successful synthesis of various DMASs-CDs with specific dual-metal compositions has been achieved, and NiMn-CDs show high intrinsic activity for urea oxidation.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
