Article
Chemistry, Physical
Chenyu Wang, Manman Yuan, Wenhua Shi, Xiaofang Liu, Liang Wu, Zhi-Yi Hu, Lihua Chen, Yu Li, Bao-Lian Su
Summary: The carbon nanotubes (CNTs) interconnected yolk-shell silicon/carbon anodes (YS-Si@CoNC) were prepared via the chelation competition induced polymerization (CCIP) approach. The YS-Si@CoNC anode exhibited improved performance with enhanced capacity and reversible specific capacity. The internal voids adequately alleviated the volumetric expansion and the CNTs and carbon shells provided an efficient conducting matrix to enhance the diffusion of electrons and lithium-ions. This research presents a convenient way of designing Si/C anode materials with a yolk-shell structure for high-performance LIBs.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Quan Ouyang, Guangshe Li, Xin Zhang, Xu Zhao, Shilong Fu, Liping Li
Summary: This study reports a yolk-shell gradient-structured SiOx-based anode derived from periodic mesoporous organosilica spheres, which exhibits exceptional cycling stability and rate capability. The unique gradient structure and composition enhance the electrical conductivity of the SiOx anode, reduce side reactions, and provide void space for SiOx expansion, effectively mitigating the stress caused by volumetric effect.
Article
Materials Science, Multidisciplinary
Yongqiang Ren, Xiuyan Li, Yinan Wang, Shaonan Gu, Chenyu Yang, Tingting Gao, Pei Cao, Guowei Zhou
Summary: In this study, Mn0.5Zn0.5Co2O4/C nanospheres with a yolk-double shell structure were prepared using a self-templating solvothermal method. The nanospheres exhibited high reversible capacity, superior cycling stability, and excellent electrochemical performance.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Physical
Zhen Kong, Zhenyan Liang, Meiling Huang, Huayao Tu, Kang Zhang, Yongliang Shao, Yongzhong Wu, Xiaopeng Hao
Summary: The rational design of yolk-shell nanostructured tin phosphide composites (SnxPy/NG) achieved high-rate and long-term cycling stability in lithium and sodium half cells. The unique structure relieved volume expansion and promoted reaction kinetics, resulting in superior energy storage performance compared to nanoclusters or nanoparticles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zeyu Zhang, Shixiong Sun, Wen Zhang, Jia Xu, Xin Wang, Chun Fang, Qing Li, Jiantao Han
Summary: A watermelon-like core-buffer-shell Si/electrochemically exfoliated graphene/C (Si/EG/C) composite was prepared using ball milling and spray drying. The composite exhibited excellent electrochemical performance due to the presence of folds and voids in the graphene layer, which buffered the volume fluctuations of the silicon core and facilitated fast lithium ion transport. It has potential applications in the next generation of Li-ion batteries.
SCIENCE CHINA-MATERIALS
(2022)
Article
Energy & Fuels
Hao Wu, Jie Ma, Xiaolei Sun, Liwei Su, Bowen Sun, Lihua Zheng, Yingying Jiang, Huan Chen, Lianbang Wang
Summary: The yolk-shell structure designed through thermal reduction and in situ surface oxidation shows high discharge capacity and good cycling stability for CoSn@CoSnO x @C as a lithium-ion battery anode material.
Article
Chemistry, Physical
Xilei Xie, Peng Xiao, Liang Pang, Peng Zhou, Yangjie Li, Jian Luo, Jiangzhi Xiong, Yang Li
Summary: In this study, a novel free-standing Si/C anode material with a yolk-shell structure and carbon nanofibers was successfully synthesized. The Si@void@C/CNFs electrode exhibited high specific capacity and good cycle stability, making it suitable for practical applications in lithium-ion batteries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Analytical
Qinxing Xie, Shipeng Qu, Peng Zhao
Summary: By encapsulating silicon particles into a nitrogen-enriched porous carbon matrix, a silicon/carbon composite was created with enhanced cycling stability and rate performance. The porous structure accommodates volume changes in silicon, while the enriched nitrogen species improve the conductivity of the carbon network.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Jie Lin, Laisen Wang, Qingshui Xie, Qing Luo, Dong-Liang Peng, C. Buddie Mullins, Adam Heller
Summary: Passivation of stainless steel by additives forming mass-transport blocking layers is extended to Si anodes for lithium-ion batteries, incorporating the passivator of LiF/Li2CO3 into bulk Si. The passivation mechanism is studied and it is found to enhance the (de)lithiation of Li-Si alloys, induce the formation of F-rich solid electrolyte interphase, stabilize the Si/LiF/Li2CO3 composite, and mitigate the volume change of Si anodes. The 3D passivated Si anode shows excellent cycling stability and high rate capability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Wenyan Chen, Shaojie Kuang, Hongshan Wei, Peizhen Wu, Tang Tang, Hailin Li, Yeru Liang, Xiaoyuan Yu, Jingfang Yu
Summary: A novel dual carbon confined SiOx/C@void@Si/C yolk-shell monodisperse nanosphere with void space has been fabricated, which can effectively accommodate the volume expansion of silicon materials and enhance the electrical conductivity of composites. The optimized anode exhibits excellent cycle stability and reversible capacity, showing potential for application.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Xiaohui Gong, Yuanbo Zheng, Jiang Zheng, Shengping Cao, Hui Wen, Baoping Lin, Yueming Sun
Summary: A low-cost method was developed to prepare yolk-shell silicon@void@carbon composite particles in this study, exhibiting significantly better cycling stability with silicon retaining about 70% of its capacity after 100 cycles.
Article
Chemistry, Physical
Haoqiang Wang, Xiaoqi Que, Yani Liu, Xingxing Wu, Qunhui Yuan, Jingyu Lu, Wei Gan
Summary: In this study, a yolk-shell structured N, S co-doped SiOx/C@void@C nanosphere was successfully fabricated, displaying excellent electrochemical performance with good conductivity and cycling stability through the co-doping of N and S elements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Physical
Mohammed Salah, Colin Hall, Candice Francis, Greg Rollo-Walker, Manrico Fabretto
Summary: Silicon-alloy is a promising replacement for carbon as an anode material due to its high specific capacity. However, its practical applications are hindered by high electrical resistance and large volume change during charge/discharge cycling. To overcome these issues, alloying with lithium-active or lithium-inactive materials has been explored. Germanium, tin, and carbon are the most promising materials for improving electrochemical performance, while silicon alloyed with copper, titanium, and vanadium can enhance capacity retention. However, more research is needed to determine the optimal alloying material, concentration, and structure.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Jian Yu, Chaoran Zhang, Weidong Wu, Yuankun Cai, Yafei Zhang
Summary: Silicon has garnered attention for its high specific capacity and abundant reserves, but its volumetric changes during charging and discharging processes have hindered industrial utilization. This study introduces a novel hybrid anode material, Si@void/CNF, designed with a nodes-connected structure that provides both a conductive reticulation for silicon nanoparticles and addresses volume variation. By adjusting the mass ratio of silicon to PMMA, an optimal structure was achieved, demonstrating excellent electrochemical performance with high specific capacity and cycling stability. The electrospun structure of nodes-connected Si@void/CNF offers a promising method for fabricating advanced silicon-based anode materials.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Dongjiu Xie, Shilin Mei, Yaolin Xu, Ting Quan, Eneli Haerk, Zdravko Kochovski, Yan Lu
Summary: This study introduced a simple route to synthesize a series of sulfur host materials with the same yolk-shell nanospindle morphology but tunable compositions for investigating the specific effect of chemical composition on the electrochemical performances of Li-S batteries. The S/FeS2-C electrode exhibited the best performance with an initial capacity of 877.6 mAh/g at 0.5 C and a retention ratio of 86.7% after 350 cycles, showing the potential for optimizing materials for other functionalities and applications.
Article
Engineering, Chemical
Sara Pakseresht, Tugrul Cetinkaya, Ahmed Waleed Majeed Al-Ogaili, Hatem Akbulut
Summary: The integrated design of urchin-like core-shell TiO2/alpha-MnO2 nanostructure was constructed for efficient catalyst electrode development in Li-O-2 batteries. The TiO2/alpha-MnO2 electrode exhibited lower overpotential and higher specific capacity, possibly due to the bifunctional catalytic activity of TiO2 and alpha-MnO2 coupled with urchin-like MnO2 nanostructures.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Ahmed Waleed Majeed Al-Ogaili, Tugrul Cetinkaya, Sara Pakseresht, Hatem Akbulut
Summary: Researchers have developed a high-efficiency electrocatalyst by supporting palladium and alpha-MnO2 nanowires on reduced graphene oxide sheets to enhance the performance of current lithium-oxygen batteries. However, there is still a limited cycle life issue due to the consumption of lithium metal.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Coatings & Films
Mehmet Uysal, Hasan Algul, Erhan Duru, Yasar Kahraman, Ahmet Alp, Hatem Akbulut
Summary: In this study, the Ni-W-TiO2-Graphene oxide co-deposition was prepared using ultrasonic-assisted pulse electrodeposition, and the effects of graphene oxide and TiO2 particles on the properties of the coating were investigated. The addition of graphene oxide and TiO2 led to increased hardness and elastic modulus, but also increased the wear rate of the resulting coating. Detailed analyses of the coatings' morphology, microstructure, and tribological behavior were conducted to understand the impact of incorporating these particles into the matrix.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Fatih Dogan, Erhan Duru, Mehmet Uysal, Hatem Akbulut, Serdar Aslan
Summary: The wear resistance performance of Ni-B-single-walled carbon nanotube (SWCNT) composite coatings was investigated and it was found that the self-lubricating effect of the SWCNTs and NiO layers improved the wear resistance of the coating.
Article
Materials Science, Multidisciplinary
Ahmed Waleed Majeed Al-Ogaili, Sara Pakseresht, Tugrul Cetinkaya, Hatem Akbulut
Summary: The significance of reduced graphene oxide (rGO) as an electrode material in lithium-oxygen batteries (LOBs) has been widely explored. Different methods have been used to produce rGO, and using Salvia Officinalis extract as a reducing agent can avoid the use of toxic chemicals. rGO reduced by Salvia extract exhibits higher capacity in LOBs.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Engineering, Chemical
Fatih Dogan, Erhan Duru, Mehmet Uysal, Hatem Akbulut, Serdar Aslan
Summary: This study investigates the effects of surfactants on Ni-B-TiN composite coatings, including their particle distribution, microstructure, surface morphology, hardness, and wear resistance. The results demonstrate the potential usability of SDS as an anionic surfactant for Ni-B-TiN metal matrix composites.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Erhan Duru, Momer Ibis, Yasar Kahraman, Hatem Akbulut, Mehmet Uysal, Serdar Aslan
Summary: The wear behavior of nickel-boron coatings produced by electroless plating was investigated experimentally and by finite element method. The results showed a high compatibility (up to 89%) between the wear rate values calculated by experimental and numerical analysis. This new approach accurately calculates the wear rate of Ni-B coatings under different wear conditions, while saving time and cost by eliminating experimental work.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Chemistry, Applied
Salimeh Gohari, Mohammad Reza Yaftian, Mohammad Reza Sovizi, Mahmud Tokur, Hassan Shayani-Jam, Hamid Reza Sharafi
Summary: Encapsulating sulfur inside carbon nanotubes is an effective approach for commercializing Lithium-Sulfur batteries. This study presents a parametric study on the capillary drawing-in dissolved materials using low surface tension solvents and ultrasonic irradiation. The results demonstrate successful physical confinement of sulfur within carbon nanotubes. The synthesized composite exhibits excellent cycling stability and high capacity as a cathodic material for Li-S batteries.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Engineering, Environmental
Abdulkadir Kizilaslan, Ahmed Waleed Majeed Al-Ogaili, Hatem Akbulut
Summary: A new transition metal sulfide with superior electrochemical performance was synthesized and evaluated as a cathode active material in all-solid-state batteries.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Sezer Tan, Hasan Algul, Erdem Kilicaslan, Ahmet Alp, Hatem Akbulut, Mehmet Uysal
Summary: TiO2-reinforced Ni-W co-depositions were successfully produced using ultrasonic-assisted pulse electrodeposition. The effects of ultrasonic powers and TiO2 concentration on the properties of the co-depositions were systematically investigated. The experimental results demonstrate that the co-depositions produced under optimal conditions exhibit excellent performance and have potential applications in replacing hard chromium.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Metallurgy & Metallurgical Engineering
Arif Karadag, Erhan Duru, Mehmet Uysal, Serdar Aslan, Hatem Akbulut, Aslan Coban
Summary: This study concentrated on reinforcing Ni-W composites with polytetrafluoroethylene (PTFE) using a pulse current (PC) electrodeposition technique on low-carbon steel substrates, resulting in enhanced abrasion resistance and low friction coefficient. The surface morphology, nano-hardness, friction, and wear performances of the co-depositions were examined under varying current densities. The results showed that the incorporation of PTFE effectively improved the tribological performance of the nickel matrix. at a current density of 10 A/dm(2), the composite coating exhibited an average friction coefficient of 0.24, indicating a significant decrease in wear rate.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Energy & Fuels
Deniz Kuruahmet, Mustafa Mahmut Singil, Aslihan Guler, Sidika Yildirim, Hatice Gungor, Esma Uzun, Engin Alkan, Mehmet Oguz Guler, Hatem Akbulut
Summary: Silicon nanoparticles (nSi) are obtained by magnesiothermic reduction methods and then incorporated into a 3D graphene aerogel (GA) via a simple freeze-drying process. The GA serves as a conductive structure and a buffer layer for the nSi, improving the structural integrity and conductivity of the anode material. The nSi/GA nanocomposite exhibits excellent cyclic stability and a capacity of 550 mAh g(-1) after 500 cycles.
Article
Materials Science, Multidisciplinary
Ramazan Karslioglu, Mustafa Akcil, Ahmet Alp, Hatem Akbulut
Summary: The microstructural and tribological properties of nickel-cobalt alloys and MWCNT-reinforced Ni-Co nanocomposite coatings were investigated. The addition of MWCNTs enhanced the hardness, wear resistance, and reduced the friction coefficient. PRC type current provided better tribological properties for both unreinforced and MWCNT-reinforced Ni-Co alloys.
Article
Chemistry, Multidisciplinary
Mahmud Tokur
Summary: Lithium-sulfur (Li-S) batteries are a promising technology for high-energy rechargeable batteries. However, challenges such as low sulfur utilization and poor lifespan need to be addressed. This study investigates the use of prelithiated graphene anode to improve the performance of Li-S batteries, with graphene showing better performance due to its high lithium storage capacity and fast lithium-ion diffusion rate.
Article
Thermodynamics
Arif Karadag, Erhan Duru, Mehmet Uysal, Hatem Akbulut, Aslan Coban
Summary: The Ni-W/PTFE co-depositions were successfully prepared on steel using pulse electrodeposition methods. The best microstructure and wear performance were achieved at a PTFE concentration of 15 g/L.