Article
Environmental Sciences
Shiwen Dong, Xuan Liu, Xianxian Kong, Feilong Dong, Yan Yu, Lizhang Wang, Da Wang, Zhiqiao He, Shuang Song
Summary: Metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) have been proven to be efficient catalysts for photocatalytic hydrogen evolution due to their tunable functionalities, permanent porosity, excellent visible light response, and physicochemical stability. In this study, a series of photocatalysts (NUBC) were prepared by loading different amounts of Zr-UiO-66-NH2 onto a benzoic acid-modified covalent triazine-based framework (BC). The resulting NUBC catalysts exhibited a type-II Z-scheme heterojunction structure formed via amide covalent bonds between NU and BC. The optimal loading of NU on BC was 30 wt.% (30NUBC), which showed a significantly higher photocatalytic H-2 evolution rate compared to NU and BC alone. The synergistic effect between the type-II Z-scheme heterojunctions and amide bonds contributed to enhanced visible light harvesting and improved charge transportation and separation. Furthermore, the NUBC catalysts showed excellent reusability and stability. Overall, this work provides insights into the design of novel MOF/COF hybrid materials and offers a systematic exploration of their photocatalytic H2 evolution properties.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Yantong Guo, Xunliang Hu, Ruixue Sun, Xiaoyan Wang, Bien Tan
Summary: Photocatalytic hydrogen evolution through water splitting using covalent triazine frameworks (CTFs) offers a promising route for solar energy conversion. However, the typical powder form of CTF-based photocatalysts poses challenges in recycling and scale-up applications. To address this limitation, CTF films were developed by in-situ growth polycondensation on glass substrates, demonstrating exceptional photocatalytic activity, stability, and recyclability. These films show a high hydrogen evolution rate and hold potential for green energy conversion and photocatalytic devices.
Article
Chemistry, Multidisciplinary
Cheng Liu, Yongchao C. Wang, Qing Yang, Xinyu Y. Li, Fangli Yi, Kewei W. Liu, Hongmei M. Cao, Cuijuan J. Wang, Hongjian J. Yan
Summary: In this study, a pi-conjugation-linked CTF-1/GO hybrid material was developed for boosting photocatalytic H-2 evolution. The improved performance was attributed to the presence of GO, acting as both an electron collector and transporter, facilitating the separation and transfer of photogenerated charges. This work could contribute to future development of novel conjugated CTF-based composite materials for high-efficiency photocatalysis.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Xiao Han, Fei Zhao, Qianqian Shang, Jinsheng Zhao, Xiujuan Zhong, Junhong Zhang
Summary: Covalent organic frameworks (COFs), particularly keto-amine-linked COFs, with advantages such as adjustable bandgaps, pi-pi stacking structure, excellent response ability to visible light, have potential applications in photocatalytic solar energy conversion and hydrogen production. By introducing peripheral nitrogen atoms, the absorption range of light is extended, surface area is enlarged, and the separation and transportation efficiencies of charge carriers are enhanced, ultimately boosting the visible-light induced hydrogen evolution reaction (HER).
Article
Chemistry, Multidisciplinary
Zhi-An Lan, Xu Chi, Meng Wu, Xirui Zhang, Xiong Chen, Guigang Zhang, Xinchen Wang
Summary: Covalent triazine frameworks (CTFs) have the potential to be efficient photocatalysts for hydrogen production using visible light. However, the uniform distribution of donor-acceptor motifs in the CTFs leads to isotropic charge separation and transfer. In this study, thiophene (Th) or benzothiadiazole (BT) units were incorporated into the molecular structure of CTF-based photocatalysts to achieve anisotropic charge carrier separation and migration. The optimized polymer exhibited significantly enhanced photocatalytic activity for hydrogen production under visible light, providing a useful approach for designing conjugated polymer photocatalysts for solar energy conversion.
Review
Polymer Science
Jijia Xie, Zhiping Fang, Hui Wang
Summary: Conjugated polymeric photocatalysts have advantages in solar-driven hydrogen generation due to their tunable structures and excellent properties. Covalent triazine-based frameworks (CTFs) show promising potential as highly efficient photocatalysts. This review summarizes the synthesis strategies, functional optimization, and applications of CTFs in the photocatalytic hydrogen evolution. The challenges and future directions for material modifications are also discussed.
Article
Materials Science, Multidisciplinary
Guocheng Huang, Guiyun Lin, Qing Niu, Jinhong Bi, Ling Wu
Summary: This study synthesized covalent triazine-based frameworks (CTFs) with cobalt single atoms as photocatalysts and demonstrated their excellent performance in CO2 reduction and hydrogen production, showing potential application in energy conversion.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Haozhen Wang, Chao Yang, Fangshuai Chen, Gengfeng Zheng, Qing Han
Summary: The TF50-COF catalyst, a partially fluorinated, metal-free, imine-linked two-dimensional triazine covalent organic framework, demonstrates high selectivity and stability in O-2 photoreduction into H2O2. By varying the proportion of fluorine substitution, the catalyst maximizes interlayer interactions, improves crystallinity, accelerates carrier transfer, and enhances photostability. The catalyst achieves a high H2O2 yield rate of 1739 mu mol h(-1) g(-1) and an apparent quantum efficiency of 5.1 % at 400 nm, surpassing the performance of previously reported nonmetal COF-based photocatalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Shengjie Gao, Peng Zhang, Guocheng Huang, Qiaoshan Chen, Jinhong Bi, Ling Wu
Summary: A trivalent iron-doped covalent triazine-based framework was designed to enhance photocatalytic activity for hydrogen production, achieving a significant improvement in efficiency.
Article
Chemistry, Multidisciplinary
Jixian Wang, Lei Li, Shan Jiang, David J. Young, Zhi-Gang Ren, Hong-Xi Li
Summary: This study presents a series of SH-group-functionalized covalent organic frameworks (COFs) as prospective photoactive materials for photocatalytic hydrogen evolution. The use of nickel thiolate as a cocatalyst significantly enhances the hydrogen evolution rate.
Article
Chemistry, Physical
Cong Wang, Tian-Yu Qiu, Ying-Nan Zhao, Zhong-Ling Lang, Yang-Guang Li, Zhong-Min Su, Hua-Qiao Tan
Summary: This study constructed 14 experimentally feasible 2D covalent triazine/heptazine-based frameworks and filtered out four promising visible-light-driven photocatalysts for producing hydrogen peroxide from water and oxygen. The computational results showed that introducing electron-rich phosphorus-alkynyl moieties effectively modulates the electronic structures and boosts the overall photocatalytic process. Among them, CHF-1 and CHF-2 exhibited the highest photocatalytic activity and theoretical solar-to-chemical conversion efficiency for hydrogen peroxide production.
ADVANCED ENERGY MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Yang Li, Xiaoyu Song, Guang Zhang, Lei Wang, Yi Liu, Weihua Chen, Long Chen
Summary: Efficiently producing clean energy is crucial for sustainable environmental development. Solar-driven water splitting for hydrogen production plays an important role in renewable energy technologies. 2D covalent organic frameworks (COFs) have gained widespread interest as photocatalysts due to their tunable optical properties and excellent stability. However, there are still challenges to be addressed in practical applications.
Article
Engineering, Environmental
Renli Yin, Yanxi Chen, Jiayue Hu, Shangbin Jin, Wanqian Guo, Mingshan Zhu
Summary: Covalent triazine frameworks (CTFs) are promising photocatalysts for environmental remediation, but their high recombination rate of photogenerated electrons and holes limits their application. In this study, peroxydisulfate (PDS) was found to effectively prevent recombination and enhance charge separation in CTF, leading to improved oxidation ability under visible light. The combined VL/CTF/PDS process showed higher efficiency in degrading pollutants, such as carbamazepine (CBZ), by attacking specific atoms and bonds in the molecule. This research demonstrates the potential of utilizing CTF materials and PDS activation for practical environmental remediation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Nanfeng Xu, Yingxue Diao, Zhengtao Xu, Hanzhong Ke, Xunjin Zhu
Summary: In this study, Ir complexes were successfully embedded into PhBp-CTF through a postcomplexation reaction, forming PhBp-CTF-Ir. Compared to the precursor without Ir complexes, PhBp-CTF-Ir exhibited a higher photocatalytic hydrogen evolution rate. This is attributed to the dual role of the Ir complexes inside PhBp-CTF-Ir as both an effective photosensitizer and a proton reduction catalyst.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Ying Zhao, Tong Li, Jianmin Gu, Bin Zhang, Pengda Zhai, Zilu Xue, Huimin Gao, Qing Li
Summary: Two kinds of high crystallinity Covalent triazine frameworks (CTFs) with AA and AB stacking models were synthesized in this study. The p-conjugated 1D channel in CTFs provides favorable conditions for electron transport and mass diffusion during hydrogen evolution. Catalytic kinetic analysis shows that the stacking configuration of CTFs plays a significant role in their electrocatalytic activity, with AA stacking enhancing their performance. Furthermore, fluorination improves the electrocatalytic performance of CTFs. This research opens up a more promising direction for the development of efficient and affordable electrochemical hydrogen evolution catalysts by altering stacking patterns.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Qian-Qian Xiong, Tahir Muhmood, Cheng-Xiao Zhao, Jing-San Xu, Xiao-Fei Yang
Summary: Transition metal-containing MXene has great potential in various research fields and its performance relies on composition, structure, dimension, and surface chemistry. The rational design and controllable synthesis of ultrathin 2D MXene nanosheets with uniform surface terminations are of great importance.
Article
Chemistry, Inorganic & Nuclear
Wenjun Zhang, Ruoqi Liu, Ziyi Fan, Huiming Wen, Yu Chen, Ronghe Lin, Yinlong Zhu, Xiaofei Yang, Zupeng Chen
Summary: The rational design of heterogeneous electrocatalysts plays a crucial role in efficient water splitting, and atomic-level active site manipulation provides a deeper understanding of catalytic mechanisms. This study constructs a copper catalyst consisting of single atoms and nanoparticles, achieving high efficiency in water splitting with low overpotentials and small cell voltage.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Composites
Xueling Xu, Deqi Fan, Hao Zhang, Jiapeng Jing, Yi Lu, Xiaofei Yang
Summary: A novel Janus composite membrane is designed to achieve efficient solar absorption and long-term salt-rejection by assembling hydrophilic vermiculite, multi-walled carbon nanotubes, and hydrophobic polydimethylsiloxane. The unique structure of the membrane separates the steam generation process from the solar absorption surface, reducing mutual interaction between escaped steam and incident light. The hydrophilic/hydrophobic channels weaken water molecules interaction, reducing interlayer friction and viscosity to accelerate flow rate. The membrane exhibits high solar evaporation rate and energy efficiency in saline water.
COMPOSITES COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Huimin Yu, Deyu Wang, Huanyu Jin, Pan Wu, Xuan Wu, Dewei Chu, Yi Lu, Xiaofei Yang, Haolan Xu
Summary: Lowering evaporation enthalpy is crucial for improving solar evaporation rate in solar-driven seawater desalination. This study presents a new approach to lower vaporization enthalpy by introducing heterogeneous interactions between hydrophilic hybrid materials and water molecules. The integration of 2D MoN1.2 nanosheets and rGO nanosheets forms stacked MoN1.2-rGO heterostructures, which significantly improve interfacial solar evaporation due to their massive junction interfaces. Molecular dynamics simulation reveals that the interactions between 2D MoN1.2 and rGO with water molecules lead to an imbalanced water state, breaking the hydrogen bonds and resulting in lowered vaporization enthalpy and improved evaporation rate (2.6 kg m(-2) h(-1)). This research provides a promising strategy for designing 2D-2D heterostructures to regulate evaporation enthalpy for cleaner water production.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Deqi Fan, Yi Lu, Xueling Xu, Yicheng Tang, Hao Zhang, Yan Mi, Xiaofei Yang
Summary: In this study, a novel approach of embedding photocatalytic materials and photothermal components into porous delignified wood is reported for water decontamination, hydrogen generation, and freshwater production. The well-designed all-in-one system effectively interfaces hydrogen-evolving semiconductor CdS with MoSe2, functioning as a co-catalyst and a photothermal agent, to drive the removal of pollutants, hydrogen production, and solar steam generation with high efficiency. The multifunctional system demonstrates a high hydrogen evolution rate and solar evaporation rate with an energy conversion efficiency up to 90.7% under one sun illumination. Encapsulation of photothermal-assisted photocatalytic systems with hydrogels effectively prevents the evaporation of toxic volatile organic compounds (VOCs) without compromising the solar steam generation performance. This study provides new insights into the rational design of novel multi-functional materials for environmental remediation and energy sustainability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Energy & Fuels
Liuqing Yang, Wenxin Liu, Tianyu Hang, Linlin Wu, Xiaofei Yang
Summary: Artificial photocatalysis plays a crucial role in carbon neutrality, renewable resources generation, and sustainable society development. MXene, with its unique layered structure and tunable properties, has emerged as a promising contender for improving the performance of photocatalysts. This review discusses the multiple roles of MXenes in promoting photocatalysis, including active site anchoring, light-transmitting media, mass transfer medium, cocatalyst, and heat conductor. The current status, challenges, and future directions for MXene-based photocatalysts are also summarized and proposed.
Article
Chemistry, Physical
Caiqin Wang, Tingting Zhou, Cheng Qian, Lili Chen, Liyuan Hao, Shumeng Fu, Bingguo Feng, Xiaofei Yang
Summary: Ti3C2Tx MXene nanonets with 3D fibrous architecture were obtained by surface modifying Ti3C2Tx MXene nanoplates via alkalization in concentrated KOH solution. They were further combined with carbon nanotube as catalyst supports for Pt nanoparticles. The 1%Pt-MNNs-9 composite catalyst showed the best hydrogen evolution performance, which might be attributed to the 3D architecture of Ti3C2Tx MNNs facilitating catalytic reaction.
SURFACES AND INTERFACES
(2023)
Review
Chemistry, Physical
Weiping Deng, Yunchao Feng, Jie Fu, Haiwei Guo, Yong Guo, Buxing Han, Zhicheng Jiang, Lingzhao Kong, Changzhi Li, Haichao Liu, Phuc T. T. Nguyen, Puning Ren, Feng Wang, Shuai Wang, Yanqin Wang, Ye Wang, Sie Shing Wong, Kai Yan, Ning Yan, Xiaofei Yang, Yuanbao Zhang, Zhanrong Zhang, Xianhai Zeng, Hui Zhou
Summary: This review article focuses on the state-of-the-art catalytic transformation of lignocellulosic biomass into value-added chemicals and fuels, including the conversion of cellulose, hemicellulose, and lignin, as well as the gasification and pyrolysis of whole biomass. The opportunities, challenges, and prospects of woody biomass valorization are highlighted.
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Hao Zhang, Yi Lu, Deqi Fan, Xueling Xu, Xiaodong Li, Xiaofei Yang
Summary: In this study, La1-xSrxCoO3 (LSC) perovskites were prepared using a hydrothermal and calcination method, and the oxygen evolution reaction (OER) activity was enhanced at x=0.1 composition. Two-dimensional (2D) Ti3C2 MXene dopant was introduced to improve electrocatalytic oxygen evolution and solar thermal evaporation. Strong interaction and charge-transfer between La1-xSrxCoO3 and Ti3C2 MXene accelerated the redox process. The obtained La0.9Sr0.1CoO3/Ti3C2 MXene (LSM) composite showed a low overpotential of 330 mV and excellent durability in 1 M KOH electrolyte. It also exhibited high solar-evaporation conversion efficiency of 96.8% under 1 sun irradiation. These findings demonstrate the great potential of perovskite-derived materials in solar desalination and electrocatalysis.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Xuan Liu, Zi-Xia Lin, Yin-Biao Shi, Xiao-Yan Wang, Ming-Ye Ding, Xiao-Fei Yang
Summary: The regulation of luminescent dynamics in lanthanide-based luminescent materials has great significance in optical thermometry and high-level anti-counterfeiting. However, achieving multimodal emissions with tunable color outputs from a single activator in simple structures is still a challenge. In this study, we present a mechanistic strategy to achieve multimodal luminescence of Er3+ activators with color-switchable outputs in a non-core-shell host. The material shows great potential in noncontact thermometry, multimodal anti-counterfeiting, and high-capacity information encryption.
Article
Chemistry, Multidisciplinary
Qiaolin Guo, Xiang Liu, Changwang Ke, Weiping Xiao, Xiaofei Yang
Summary: This study successfully synthesized FeOOH/Ni3S2 heterostructure via a corrosion engineering strategy, which features a multi-anionic hierarchical structure and interfacial electronic interaction. The obtained heterostructure can catalyze overall water splitting reaction with low overpotentials at high current density.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Qin Zhao, Yu Zhang, Changwang Ke, Xiaofei Yang, Weiping Xiao
Summary: The synthesis of Pt-based alloys anchored on MXene with oxygen vacancy defects demonstrates enhanced catalytic performances for the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). By utilizing wet chemical stripping and intercalation methods, the oxidation of Pt during the formation of alloys is prevented, and the interfacial synergistic effects between Pt alloys and the dispersed substrate are clarified. The optimized catalytic activities for HER and ORR are achieved at 700 degrees C. These findings provide new insights into the design of highly active catalysts and broaden the application of MXene-based catalysts.
Article
Chemistry, Physical
Jingyuan Zhao, Xuan Wu, Huimin Yu, Yida Wang, Pan Wu, Xiaofei Yang, Dewei Chu, Gary Owens, Haolan Xu
Summary: Direct conversion of low-grade heat into electricity has great potential for energy generation. This study presents a thermogalvanic cell that utilizes a cellulose fiber-based porous aerogel to harvest and convert thermal energy, while minimizing heat loss.
Article
Materials Science, Multidisciplinary
Jiapu Li, Ziyu Wang, Laiming Jiang, Zechuan Yu, Xu Ge, Jun Ou-Yang, Xiaofei Yang, Xiaobao Tian, He Tian, Benpeng Zhu
Summary: A photoacoustic sound generator based on vertical single-wall carbon nanotubes array with an internal nano-Helmholtz cavity is introduced. This device produces an audio signal through the forced vibration of the air inside the carbon nanotubes, and exhibits anomalous photoacoustic behavior with a resonance peak in the sound pressure level curve. The energy conversion efficiency is higher compared to a graphene sponge-based photoacoustic device. Additionally, this device can be used for music playing.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
