Article
Chemistry, Multidisciplinary
Bal Sydulu Singu, Emad S. Goda, Kuk Ro Yoon
Summary: In this study, multiwall carbon nanotubes were used as a reducing agent to prepare CNT-MnO2 nanocomposites by varying the amount of potassium permanganate. The chemical compositions and electrochemical properties of the synthesized materials were analyzed, showing that CNT-MnO2-25 nanocomposites exhibited excellent specific capacitance and capacitance retention.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Polymer Science
Tatiana P. Dyachkova, Yulian A. Khan, Elena A. Burakova, Evgeny V. Galunin, Gulnara N. Shigabaeva, Dmitry N. Stolbov, Georgy A. Titov, Nikolay A. Chapaksov, Alexey G. Tkachev
Summary: This paper discusses the development of fillers made from mixtures of carbon nanotubes and graphene materials to modify epoxy resin. The effects of different types and contents of graphene on the particle sizes of the dispersed phase in aqueous suspensions and the resin were analyzed. The optimal dispersions were achieved at a mass ratio of 1:4 between carbon nanotubes and graphene oxide, with particle sizes of 75-100 nm. The composites showed increased tensile strength and modulus when containing 0.15-0.20 wt.% of carbon nanotubes/graphene oxide at a ratio of 1:1.
Article
Materials Science, Ceramics
Alei Dang, Zeqi Yuan, Xin Liu, Shuze Ma, Yali Yang, Amir Zada, Yali Gao, Yuhui Liu, Tiehu Li, Yanying Han
Summary: The preparation of high performance, low cost and recyclable adsorbents is crucial for dealing with water pollution. Carbon foam (CF) is a promising adsorbent, but its uneven size distribution and lack of adsorption sites hinder its application. In this study, CF/CNTs/GO composites were successfully prepared, and the addition of CNTs and GO nanosheets significantly improved the adsorption performance. This work provides a low-cost fabrication technique for high-performance CF/CNTs/GO adsorbents and contributes to the treatment of contaminated water.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Wenhao Peng, Zilong Su, Kaixuan Chen, Jiajun Wang, Bowen Chen, Shixin Jiang, Jinyang Yan, Shiping Luo, Aijuan Xie
Summary: Supercapacitors have emerged as a promising energy storage device due to their unique advantages, and the choice of suitable electrode materials plays a crucial role in improving their performance. In this study, a series of CuFexMn2-xO4-MWCNT-y spinel composites were successfully synthesized via a solvothermal method. The CuFe0.4Mn1.6O4-MWCNT-3 modified electrode demonstrated the highest specific capacitance of 656.7 F.g(-1) at a current density of 1.0 A.g(-1), with good cycling stability of 80.6% capacitance retention after 5000 cycles at a current density of 8.0 A.g(-1). Moreover, the CuFe0.4Mn1.6O4-MWCNT-3//activated carbon (AC) asymmetric supercapacitor exhibited a higher capacitance of 104.0 F.g(-1) at 1.0 A.g(-1), with a maximum energy density of 30.43 Wh.kg(-1) and power density of 3500 W.kg(-1). These results suggest that the CuFe0.4Mn1.6O4-MWCNT-3 composite holds great potential for energy storage applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Chemistry, Inorganic & Nuclear
Rajan Lakra, Rahul Kumar, Parasanta Kumar Sahoo, Dhirendranath Thatoi, Ankur Soam
Summary: This review discusses the developments towards graphene based composite electrodes for supercapacitor application, highlighting graphene as a potential electrode material due to its extraordinary physical and chemical properties. However, the issue of low energy density has been addressed by mixing graphene with other materials to enhance the overall performance of supercapacitors.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Jiaxin Song, Yi He, Shanling Wang, Wenkang Li, Yixin Dai, Wenxue Li, Jian Guo, Hong Zhang, Filippo S. Boi
Summary: This study reinvestigates the carbon-sulfur doping mechanism, using buckypapers and graphene oxide films as host materials, demonstrating the existence of carbon-sulfur bonds and investigating the electrical and magnetic properties after sulfur doping.
DIAMOND AND RELATED MATERIALS
(2022)
Review
Biochemistry & Molecular Biology
Raja Ram Pandey, Charles C. Chusuei
Summary: Carbon nanomaterials are extensively used in electrochemical sensing composites due to their unique properties, however, their long-term ecological fate remains unknown. Graphene and carbon dots are more biodegradable compared to carbon nanotubes, and design elements such as Coulombic attraction and specific atoms as tethering points are crucial for electrocatalytic performance.
Article
Construction & Building Technology
Peiqi Li, Junxing Liu, Heongwon Suh, Erfan Zal Nezhad, Sungchul Bae
Summary: This study investigated the enhancement effect of a synthesized GNFG complex on the fire resistance of cementitious composites, comparing it with traditional nano-reinforcements CNTs and GO. The results showed that GNFG exhibited good dispersion and thermal stability, promoting hydration of the cement and improving its microstructure and mechanical properties. These findings suggest that GNFG can serve as a novel nano-reinforcing agent to enhance the mechanical properties and fire resistance of cementitious materials.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Liangxiao Wei, Xuyang Liu, Youzhi Gao, Xuewei Lv, Ning Hu, Min Chen
Summary: Titanium matrix composites reinforced by graphene oxide (GO) and carbon nanotube (CNT) were successfully prepared by hot-pressing sintering. The addition of GO significantly improved the dispersion of CNT and led to the formation of TiC particles in the composite. A significant synergetic effect was observed between GO and CNT, enhancing the mechanical properties of the composite.
MATERIALS & DESIGN
(2021)
Article
Engineering, Environmental
Sandya Rani Mangishetti, Daehee Jang, Junil Choi, Gaddam Rajeshkhanna, Suresh Pittala, Song Kyu Kang, Junhyuk Ji, Minho Kim, Seung Gyu Jung, Jungseub Ha, Jihoon Kim, Junbeom Maeng, Gwan Hyeon Park, Jaejin Bae, Won Bae Kim
Summary: Efficient fusion of components into hybrid nanostructures is crucial for obtaining electrode materials for supercapacitors. Two types of 3D graphene-based hybrid nanomaterials were synthesized and their microstructural properties were studied. These materials showed high specific capacitance and rate capability, making them promising for energy storage devices.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jun Zhou, Yuying Zheng, Dongyang Chen
Summary: By using a reduction-reaction-induced self-assembly process, a new type of three-dimensional porous aerogel with partially unzipped multiwalled carbon nanotubes inserted into graphene nanosheets was prepared. The aerogels exhibited excellent electrical contact, prevented restacking of graphene nanosheets, and provided large channels for charge transfer, resulting in promising electrode materials for supercapacitor applications.
Article
Nanoscience & Nanotechnology
Achal Singh Keshari, Prashant Dubey
Summary: In this study, amorphous MnOx nanostructures were synthesized by a redox reaction between carbon dots and KMnO4 at room temperature. The presence of carbon dots was found to be essential for the precipitation of amorphous MnOx under ambient conditions. The incorporation of a small amount of multiwalled carbon nanotubes before and after the formation of amorphous MnOx resulted in nanocomposites with improved energy storage ability. The synthesized materials exhibited high specific capacitance, promising rate capability, and high cycling stability.
ACS APPLIED NANO MATERIALS
(2022)
Review
Polymer Science
Suguna Perumal, Raji Atchudan, In Woo Cheong
Summary: The review discusses the preparation, existing methods, and applications of stable graphene-polymer composites/dispersions, as well as the solvents, surfactants, and polymers involved. It concludes with a summary and prospects for the development of stable graphene dispersions.
Article
Nanoscience & Nanotechnology
Sampath Parasuram, Poulami Banerjee, Rishi Raj, S. Kumar, Suryasarathi Bose
Summary: Fiber-reinforced polymer composites, especially carbon fiber-reinforced epoxy (CFRE) laminates, have been widely used in the aircraft and aerospace industry. The interface between the matrix and fiber plays a critical role in determining the overall structural properties of CFRE laminates. In this study, electrophoretic deposition (EPD) was used to deposit covalently coupled multiscale graphene oxide (GO)/carbon nanotube (CNT) nanoconstructs onto carbon fiber (CF) fabric, resulting in improved flexural strength and interlaminar shear strength compared to the neat CFRE. The deposition of GO/CNT nanoconstructs improved the performance of CFREs by enhancing wettability, surface free energy, and surface roughness.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Energy & Fuels
Jiaming Wang, Ying Huang, Yan Gao, Jiayi Dai, Xu Sun
Summary: Carbon nanofibers (CNFs) have attracted considerable attention due to their ability to enhance the properties of materials. This paper proposes a method to enhance the electrochemical performance and flexibility of CNFs by using electrostatic self-assembly and a dipping and drying strategy. The resulting PAN@rGO@PPy electrode shows specific capacitance of 203 F g(-1) and high energy density of 15 Wh kg(-1) in a flexible supercapacitor. It also demonstrates remarkable cycling stability after 10,000 cycles. The research provides valuable insights for the development of flexible energy storage devices.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Multidisciplinary
Rui Sun, Bo Jin, Bin Huo, Caixia Yuan, Hua-Jin Zhai, Yan-Bo Wu
Summary: We report a sigma + pi double aromatic CB5S5+ cluster with a planar hypercoordinate carbon inside a boron wheel, which is the first global minimum of its kind. The stabilization of the carbon-centered boron wheel is achieved by five peripheral sulfur atoms weakening the electron deficiency of the boron atoms through strong S -> B pi back-bonding.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Shu-Juan Gao, Jin-Chang Guo, Hua-Jin Zhai
Summary: This study investigates the structure and chemical bonding properties of the binary B5O6- cluster through quantum chemical calculations. The results reveal a planar C-2v geometry with a heteroatomic hexagonal B3O3 ring and weak 6 pi aromaticity. The study uncovers a structural transformation in the B5On- series upon oxidation and suggests that the cluster belongs to superhalogen anions.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Peng-Fei Han, Ying-Jin Wang, Qiang Sun, Hua-Jin Zhai
Summary: Combining quantum chemical calculations with unbiased global searches, a unique binary B7Mg4+ cluster has been revealed, in which a vertically oriented Mg-2 dimer is incorporated into a ringent B-7 disk, forming a hybrid Mg2B7 molecular wheel with pseudo-seven-fold in-plane coordination. The concept of electronic transmutation has been used to elucidate the unique plier shape of the cluster.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Physical
Ying-Jin Wang, Lin-Yan Feng, Miao Yan, Hua-Jin Zhai
Summary: The beryllium-doped Be3B11- cluster has two nearly isoenergetic isomers with different geometries. The structural transformation of the boron skeleton is enabled by the electrostatic interaction between beryllium atoms and the boron skeleton. This cluster exhibits dynamic fluxionality and spherical aromaticity due to the free migration of boron atoms and the presence of delocalized pi bonds.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Rong-Xin Yue, Shu-Juan Gao, Peng-Fei Han, Hua-Jin Zhai
Summary: Despite the isovalency between Al and B elements, Al-doping in boron clusters can lead to a unique sandwich di-Al-doped boron cluster, Al2B8. This cluster exhibits dynamic fluxionality with a vertically sliding or rotating Al-2 rod on a B-8 plate, despite no direct Al-Al interaction. The cluster shows charge-transfer complex behavior and has a magic 6 pi/6 sigma double aromaticity.
Article
Chemistry, Physical
Rui Sun, Caixia Yuan, Hua-Jin Zhai, Yan-Bo Wu
Summary: In this work, we computationally designed a series of aluminum chalcogenide clusters NAl4X4+ (X = S, Se, Te) with a desired planar tetracoordinate nitrogen and significantly improved chemical stability. These clusters are stabilized by peripheral chalcogen atoms and electron-compensated aluminum atoms via X ? Al p back bonds.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Peng-Fei Han, Ying-Jin Wang, Lin-Yan Feng, Shu-Juan Gao, Qiang Sun, Hua-Jin Zhai
Summary: Doping alkali metals into boron clusters can compensate for boron's electron deficiency and lead to interesting boron-based binary clusters. We report on the computational design of a three-layered sandwich cluster, Na5B7, which exhibits charge-transfer complex and three-fold aromaticity. Molecular dynamics simulation shows that the sandwich cluster is dynamically fluxional even at room temperature. The Na5B7 cluster offers a new example for dynamic structural fluxionality in molecular systems.
Article
Biochemistry & Molecular Biology
Peng-Fei Han, Qiang Sun, Hua-Jin Zhai
Summary: We predict a new example of boron-based inverse sandwich alloy clusters, V2B7-, through computational global-minimum structure searches and quantum chemical calculations. Chemical bonding analysis reveals that the inverse sandwich cluster is governed by globally delocalized 6p and 6s frameworks, following the (4n + 2) Huckel rule. The skeleton B-B s bonding is shown to be quasi-Lewis-type, roof-like 4c-2e V-B-2-V s bonds, covering the whole surface of the inverse sandwich cluster in a truly three-dimensional manner.
Article
Chemistry, Physical
Ying-Jin Wang, Lin-Yan Feng, Miao Yan, Chang-Qing Miao, Hua-Jin Zhai
Summary: Computational evidence is presented for the existence of the largest planar molecular wheel composed of an yttrium atom surrounded by a highly symmetric B8C4 ring. The B8C4 ring exhibits double 9 pi/10 sigma aromaticity in the -(BCB)(4)- form. The yttrium atom at the center is dodeca-coordinated with the peripheral B8C4 ring, setting a new record for the coordination number in a planar structure.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Polymer Science
Hai-han Zhou, Meng-yao Ren, Hua-jin Zhai
Summary: Graphite sheet (GS) is commonly used as a current collector in supercapacitors, but its 2D flat surface limits charge transport. In this study, mechanically exfoliated GS (MEGS) is proposed as a current collector, which forms a unique layered microstructure. The electropolymerization parameters are optimized to enhance the electrochemical performance of poly(3,4-ethylenedioxythiophene) (PEDOT) films as the electroactive material. By using MEGS as the current collector, a 3D interface is established between the PEDOT films and MEGS, leading to significantly improved electrochemical properties of the PEDOT electrodes.
ACTA POLYMERICA SINICA
(2022)
Article
Chemistry, Multidisciplinary
Chen Chen, Meng-hui Wang, Lin-Yan Feng, Lian-Qing Zhao, Jin-Chang Guo, Hua-Jin Zhai, Zhong-hua Cui, Sudip Pan, Gabriel Merino
Summary: We report a class of clusters containing a planar hexacoordinate silicon atom, and describe their structures and properties in detail. Heavier alkaline-earth atoms stabilize the peripheral ring by forming covalent bonds with silicon, while lighter homologues exhibit repulsive interactions due to electrostatic forces. Furthermore, we find that the planarity of the silicon core and the attractive nature of all six contacts are maintained in N-heterocyclic carbene and benzene-bound complexes, which has important practical applications.
Article
Chemistry, Physical
Peng-Fei Li, Hua-Jin Zhai
Summary: This study computationally designed two boron-based quasi-planar or planar clusters, and found that contrary to expectations, the B12O cluster does not contain a boronyl ligand. Chemical bonding analysis reveals that the B12O cluster has three-fold pi/sigma aromaticity, which underlies its stability.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ying-Jin Wang, Lin-Yan Feng, Miao Yan, Chang-Qing Miao, Su-Qin Feng, Hua-Jin Zhai
Summary: Theoretical evidence is reported for a boron-based sandwich cluster, showing a perfectly structured ring and ligands. This complex possesses unique chemical bonding and dynamic fluxionality.
Article
Chemistry, Inorganic & Nuclear
Haihan Zhou, Yuqin Liu, Mengyao Ren, Hua-Jin Zhai
Summary: A low-cost and scalable method for the fabrication of mechanically exfoliated graphite paper (MEGP) as a current collector in electrochemical capacitors (ECs) is proposed. The MEGP is used to load multi-walled carbon nanotube@polypyrrole (MWCNT@PPy) core-shell hybrids as active materials. The resulting MEGP/MWCNT@PPy electrodes exhibit superior electrochemical properties and high flexibility, with good cycling stability and mechanical deformation resistance.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Physical
Lian-Qing Zhao, Jin-Chang Guo, Hua-Jin Zhai
Summary: A class of ternary 14-electron clusters, XB2Be2 (X = Si, Ge, Sn, Pb), have been computationally predicted to have stable planar tetracoordinate silicon and its heavier congeners. These clusters maintain stability through a unique aromaticity rather than the traditional 14-electron count rule.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Jinfei Dai, Chenjing Zhao, Jie Xu, Hossein Roshan, Hua Dong, Francesco Di Stasio, Fang Yuan, Bo Jiao, Zhaoxin Wu
Summary: In this study, the performance of perovskite nanocrystal light emitting diodes (PNC-LEDs) was enhanced through rational device structure design and the application of high-performance perovskite nanocrystal emitting layers.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Jia-Hua Yeh, Suhendro Purbo Prakoso, Leon Lukhas Santoso, Shi-Ju Chen, Bryan Chiang, Ju-Chieh Cheng, Ru-Ning Zhang, Yu-Cheng Chiu
Summary: This study demonstrates the application of a renewable material called dextrin-SMS in the production of electret filters and transistor memory. Dextrin-SMS material can maintain prolonged electrostatic charges and has a relatively wide memory window, making it suitable for the production of biodegradable face masks and green electronics.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Ahmad Telfah, Qais M. Al-Bataineh, Ahmad A. Ahmad, Rund Abu-Zurayk, Carlos J. Tavares, Johannes Etzkorn, Farzad Foadian
Summary: Polyacrylic acid complexed with polyaniline (PAA/PANI) composite materials have the potential to form organic mixed ion-electron conductive (OMIEC) films, which can be used in optoelectronic and energy storage applications. The composite films are formed through an acid-base reaction, resulting in strong electrostatic interactions and intermolecular hydrogen bonds between PANI and PAA. The separation of PANI-rich domains from PAA-rich matrix in the composite films is observed. The electrical conductivity of the composite films is higher when the content of PANI is 33 wt%, due to the high ionic-electronic coupling at the interface between phase-separated regions.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Min-Chih Hou, Dian Luo, Yu-Ting Huang, Shun-Wei Liu, Chin-Wei Lu, Chih-Hao Chang, Hai-Ching Su
Summary: Light-emitting electrochemical cells (LECs) have great potential for novel emission applications, but their relatively low device efficiency hinders their competitiveness with other emission technologies. A study finds that increasing the concentration of small TiO2 nano-particles in the diffuser film can enhance light extraction and improve the device efficiency of LECs.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Qiaoli Niu, Yao Xu, Jun Yang, Wei Hua, Baoxiang Chai, Zequan Zhang, Yuhui Ma, Wenjin Zeng, Ana Flavia Nogueira, Ruidong Xia
Summary: By introducing CPB as a defect passivation agent in the perovskite precursor solution, the optoelectronic properties of perovskite films can be significantly improved and non-radiative carrier recombination can be effectively suppressed. CPB-modified perovskite solar cells exhibit lower trap-state density and stronger carrier migration capability, leading to enhanced power conversion efficiency and stability.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Hulya Ozturk Dogan, Fatma Yildirim, Zeynep Orhan, Ali Ben Ahmed, Mostefa Benhaliliba, Sakir Aydogan
Summary: In this study, efficient self-powered visible and UV photodetectors based on hybrid organic-inorganic materials were demonstrated. The photodetectors showed excellent UV detecting capability and good photoresponsivity.
ORGANIC ELECTRONICS
(2024)