Article
Energy & Fuels
Yu Song, Hong Wu, Biemin Sun, Min Liu, Wucui Ren, Yanqin Xu, Yuan Cao, Changguo Chen
Summary: Folded nanotubes were grown directly on Ni foam using a two-step hydrothermal method to form activated carbon (AC) and NiCo2S4 composite material with a unique nano-urchin structure. The morphology and structure could be controlled by the duration of the hydrothermal reaction. Characterization of the samples was done using XRD, XPS, EDS, and SEM. The electrochemical tests showed that the 12-hour hydrothermal composites (AC@NiCo2S4-2) had a complete folded nanotube structure, a large number of reactive sites, and better electrochemical properties compared to the 6-hour and 24-hour composites. The AC@NiCo2S4-2 also exhibited a high specific capacitance of 653.9 C g-1 at a current density of 1 A g-1, compared to the capacitance of NiCo2S4 (456.14 C g-1). Furthermore, the AC@NiCo2S4-2 showed improved electrochemical performance and cycle stability after combining with AC, with a capacitance retention rate of 62.84% at 10 A g-1 compared to 1 A g-1 and retaining 84.96% of the initial capacitance after 3000 cycles. Additionally, the hybrid supercapacitor (HSC) based on AC@NiCo2S4-2 and AC electrodes achieved a high energy density of 29.75 Wh kg-1 at a power density of 700 W kg-1 and maintained an energy density of 16.86 Wh kg-1 at a high power density of 7000 W kg-1.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
Jia-Yue Xie, Kai Wang, Ning-Ning Li, Guang-Lu Lei, Hou-Shan Mei, Xiang-Hong Liu, Jun Zhang
Summary: The study reports the design of integrative carbon nanotubes@germanium films as binder-free electrodes for potassium-ion batteries. The films demonstrate higher specific capacity, rate performance, and cycling stability compared to pristine germanium and carbon nanotubes electrodes. The enhanced potassium storage properties are attributed to the interconnected carbon nanotubes that effectively buffer the volume expansion of germanium during alloying/dealloying process.
Article
Chemistry, Multidisciplinary
Arkady N. Redkin, Alena A. Mitina, Eugene E. Yakimov
Summary: Significant progress has been made in the performance of supercapacitors through the development of composite electrodes that combine various charge storage mechanisms. This study proposes a new method for preparing composite binder-free MnO2/MWCNT/Al electrodes for supercapacitors, which demonstrated excellent charge/discharge characteristics and stability to multiple cycles.
Article
Chemistry, Physical
Jaemin Kim, Jewon Choi, Kiho Park, Sungchan Kim, Kwan Woo Nam, Kookheon Char, Jang Wook Choi
Summary: Increasing the silicon content in the silicon-graphite composite anode to maximize the energy density of a lithium-ion battery cell is a challenging task due to the contradictory surface characteristics of silicon and graphite. This study presents an amphiphilic host-guest complex binder composed of pyrene-conjugated poly(acrylic acid) and a hyperbranched gamma-cyclodextrin polymer, which effectively maintains the integrity of the electrode and improves the cycling performance and rate capability of Si-Gr electrodes.
ADVANCED ENERGY MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Phakkhanan Khamnantha, Chanakran Homla-or, Khomson Suttisintong, Jedsada Manyam, Marisa Raita, Verawat Champreda, Varol Intasanta, Hans-Juergen Butt, Ruediger Berger, Autchara Pangon
Summary: By using BT as a cross-linker, this work enhances the oxidative thermostabilization of lignin-rich nanofibers and successfully prepares activated carbon nanofibers. The properties of the resulting ACNFs are influenced by the structure and composition of lignins, with ACNFs from LB showing the highest specific capacitance and cycling stability.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Chia-En Hsieh, Ching Chang, Shivam Gupta, Chung-Hsuan Hsiao, Chi-Young Lee, Nyan-Hwa Tai
Summary: This study demonstrates a novel fabrication method for supercapacitor electrodes composed of CoMn2O4 nanosheets coated onto carbon nanotubes grown on a stainless-steel mesh. By controlling the deposition time of the nanosheets, favorable morphology and excellent capacitance can be achieved. The material, which does not require binders or additives, exhibits high specific capacitance and is of significant importance for practical energy storage devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Shan Liu, Haishun Du, Kun Liu, Ming-Guo Ma, Ye-Eun Kwon, Chuanling Si, Xing-Xiang Ji, Sun-Eun Choi, Xinyu Zhang
Summary: Flexible and porous Co3O4-carbon nanofibers were prepared by electrospinning and carbonization, which can be used as free-standing electrodes for supercapacitors. These electrodes exhibit high specific capacitance and good mechanical flexibility.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Energy & Fuels
Hanie Kazari, Elmira Pajootan, Mark Sowa, Sylvain Coulombe, Pascal Hubert
Summary: Plasma-enhanced atomic layer deposition of ruthenium on functionalized carbon nanotubes eliminates the need for binders and toxic by-products. The electrodes show improved capacitance and low charge transfer resistance when compared to bare carbon nanotubes. The 3D flexible electrodes exhibit high capacitance and retention after cycling and bending tests.
JOURNAL OF ENERGY STORAGE
(2023)
Review
Engineering, Environmental
Bhavana Joshi, Edmund Samuel, Yong-il Kim, Alexander L. Yarin, Mark T. Swihart, Sam S. Yoon
Summary: Carbon nanofibers derived from electrospun precursors show great promise for electronic applications by integrating metal oxides and sulfides, eliminating various problems, and offering a cost-effective strategy for fabrication of lightweight lithium-ion batteries with high capacity.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Ceramics
George Hasegawa
Summary: This review focuses on the recent progress in porous monolithic electrodes with special concern for those with three-dimensionally interconnected porous structures prepared via the sol-gel processes accompanied by phase separation. In addition to the synthesis and pore control for various electrode materials, the insights garnered from the electrochemical investigations on the porous monolithic electrodes are overviewed.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yongbo Yu, Qing Wang, Jianfeng Dai, Xiangyu Shi, Can Wang
Summary: In this study, binder-free tungsten oxide carbon nanofibers and graphene oxide composites were prepared as self-supporting anodes for lithium-ion batteries using a one-step electrostatic spinning technology. The composites exhibited excellent performance by suppressing expansion during the cycle, providing continuity, uniform width, and facilitating charge transfer and electrolyte penetration.
NEW JOURNAL OF CHEMISTRY
(2022)
Review
Chemistry, Inorganic & Nuclear
Bhavana Joshi, Edmund Samuel, Yong-il Kim, Alexander L. Yarin, Mark T. Swihart, Sam S. Yoon
Summary: The versatile electrospinning technique is used to fabricate highly conducting freestanding carbon nanofiber composite electrodes with improved performance for energy storage devices. Different morphologies of metal oxides and sulfides can be grown on the electrodes to enhance pseudocapacitance. Electrospun nanofiber electrodes have demonstrated significant electrochemical performance.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Physics, Condensed Matter
R. K. Azega, Mohammad Mazharul Haque, Agin Vyas, Pui Lam Tam, Anderson D. Smith, Per Lundgren, Peter Enoksson
Summary: The fabrication and electrochemical performance of thick activated carbon electrodes with carbonized lignin-derived carbon fiber inclusions are reported. The addition of carbonized lignin-derived carbon fibers improves the flexibility and conductivity of the electrode, leading to increased specific capacitance. The use of a environmentally friendly binder, microfibrillated cellulose, serves as a robust and safe alternative to commonly used hazardous binders.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Energy & Fuels
Rafael Vicentini, Willian G. Nunes, Lenon H. da Costa, Leonardo M. Da Silva, Bruno Freitas, Aline M. Pascon, Otavio Vilas-Boas, Hudson Zanin
Summary: A novel multi-walled carbon nanotubes and activated carbon composite material was reported as an electrode for electrochemical capacitors, showing low equivalent series resistance and operational stability in aqueous electrolytes. The simple, fast, and low-cost approach resulted in devices with high voltage and specific capacitance, demonstrating good cyclability and potential for environmentally friendly electrolytes.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Physical
Emad S. Goda, Sang Eun Hong, Kuk Ro Yoon
Summary: This study introduces a novel bottom-up protocol for the deposition of Cu-PBA@GO nanocubes as a binder-free electrode for supercapacitors. The impact of reaction cycles on the morphology, crystallinity, and electrochemical behavior of copper hexacyanoferrate nanocubes was investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)