Article
Nanoscience & Nanotechnology
Minjun Kim, Xingtao Xu, Ruijing Xin, Jacob Earnshaw, Aditya Ashok, Jeonghun Kim, Teahoon Park, Ashok Kumar Nanjundan, Waleed A. El-Said, Jin Woo Yi, Jongbeom Na, Yusuke Yamauchi
Summary: The synergistic effects of hollow nano-architecture and high specific surface area of hollow activated carbons (HACs) were reported to significantly enhance the performance of supercapacitors (SC) and capacitive deionization (CDI). By optimizing nanopore distribution and designing large macropores, significant improvements in capacitance and desalination performance can be achieved.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Energy & Fuels
Zhuoxun Li, Tao Feng, Peng Zhou, Rubing Zhang, Gang Liu
Summary: The flower-like porous MnO2 supported on a zeolitic imidazolate framework (ST@ZIF-67/MnO2) was fabricated through SiO2-guided preparation. It showed enhanced supercapacitive properties and good electrochemical cycling stability.
Article
Chemistry, Analytical
Yao Sun, Jianjun Xue, Zhiwei Li, Bing Ding, Yufeng An, Shuai Zang, Hui Dou, Jiangmin Jiang, Xiaogang Zhang
Summary: A eco-friendly and facile approach has been applied to synthesize PCFs with tunable multi-level pores and satisfactory electrochemical performance in this study. Utilizing electrospinning technology, hard-template method, and carbonization process, nanofibers with interconnected multi-level pores were achieved for enhanced electrochemical performance. The engineered PCFs demonstrated high capacitance and excellent rate capability, along with symmetrical supercapacitors exhibiting good capacitance and high energy density with ionic liquid electrolyte.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Chuanzheng Hu, Junhui Xu, Zhen Lu, Chunhua Cao, Yazhen Wang
Summary: Core-shell structured ZIF-7@ZIF-67 has been synthesized, showing promising capacitance performance and cyclic stability, making it a potential candidate for energy storage devices.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Ming Shi, Yanfei Xin, Xinxing Chen, Kunyang Zou, Weitao Jing, Junjie Sun, Yuanzhen Chen, Yongning Liu
Summary: Porous activated carbon material derived from anthracite through KOH activation exhibits a large specific surface area and porous structure, making it suitable for electrode materials in supercapacitors and symmetric capacitors. The material shows high specific capacity, energy density, and superior cyclic stability, broadening the horizon of electrode materials for specialized hybrid supercapacitor applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Shaofei Zhang, Jing Ren, Tao Gu, Hao Guo, Hongquan Wang, Muhammad Imran, Rui-Peng Ren, Yong-Kang Lv
Summary: This study presents a new approach to design and fabricate porous nickel cobalt sulfide sheets anchored on thermally activated carbon cloth for flexible supercapacitor anodes. The porous NiCoS/ACC electrode exhibits excellent electrochemical performance and cycling stability. The combination of excellent electrical conductivity, enriched redox-active sites, high porosity, and large electrode-electrolyte contact area contributes to the enhanced electrochemical properties.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Chemistry, Physical
Xiangxia Jing, Lei Wang, Konggang Qu, Rui Li, Wenjun Kang, Haibo Li, Shenglin Xiong
Summary: Developing monolithic electrodes with high capacitor performance using chemically activated commercial melamine sponges and KOH is a challenge in the energy storage field. The study demonstrates that adjusting the KOH/melamine sponge mass ratio can regulate the graphitization degree, heteroatom content, and pore size distribution of the monolithic N-/O-doped carbon sponge electrodes. The optimized electrode shows promising specific capacitances and retention rates, and the charge storage mechanism in NOCSs is systematically studied to separate different capacitance contributions. Additionally, the NOCSs show good capacitance performances in all-solid-state supercapacitors, providing high energy density and power output for driving LED devices.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Ying Wang, Mengfei Qiao, Xamxikamar Mamat
Summary: Nitrogen-doped hierarchical ordered porous carbon (NHOPC), derived from a novel single-crystal ordered macroporous ZIF-8, exhibits a three-dimensional interconnected macro-meso-micropore structure. The optimized NHOPC-900 shows excellent electrochemical performance, attributed to the synergistic effect of large specific surface area, fast mass transfer, and nitrogen-doped matrix.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Zahra Ebrahimi, Mohammad Rad, Vahid Safarifard, Morteza Moradi
Summary: In this research, the overall ZIF structure was modified by introducing another linker using post-synthetic solvent-assisted ligand exchange (SALE), and its energy storage properties as a supercapacitor were investigated. Various analyses were conducted to identify the materials, and the functional groups of each ligand were determined. The performance of the materials was evaluated through electrochemical tests using different electrolytes. The study identified the best compound and discussed the construction of an asymmetric supercapacitor. The asymmetric supercapacitor exhibited high specific capacitance, specific energy, and retained its capacitance after multiple cycles.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Energy & Fuels
Ayesha I. Samrin, Raghavendra B. Babu, Mohammed Rehaan Chandan, Mandhakini Mohandas
Summary: By directly carbonizing and activating expired dried chickpeas with ZnCl2, porous activated carbon was prepared for supercapacitor application, providing an insight into clean and sustainable energy from green renewable waste. The structural, morphological, and electrochemical analysis were conducted on the powdered expired chickpeas mixed with zinc chloride in various ratios and pyrolyzed at high temperatures. The carbonized samples exhibited micropores and mesopores, with specific surface area ranging from 865.002 m2/g to 1094.638 m2/g and pore volume ranging from 0.618 cc/g to 0.739 cc/g. The fabricated symmetric device showed a specific capacitance of 204.6 F/g at 5 mV/s, an energy density of 11.732 Wh/kg, and a power density of 266.196 W/kg at 1 A/g, with a capacitive retention of 97.48% over 3000 cycles. Therefore, the heterogeneous porous structure and excellent surface area contribute to enhancing the electrochemical behavior of expired white chickpeas as waste-derived carbon samples.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Gaoxu Han, Jianbo Jia, Quanrun Liu, Guangxu Huang, Baolin Xing, Chuanxiang Zhang, Yijun Cao
Summary: A series of coal-based hierarchical porous carbons with adjustable pores were successfully prepared using Zinc chloride as a template during the carbonization process, leading to improved electrical conductivity and specific capacitance of the products.
Article
Chemistry, Multidisciplinary
Rui Liu, Jing-Xuan Wang, Wein-Duo Yang
Summary: In this study, hierarchical porous activated carbon was prepared using coconut husk biomass waste as the carbon precursor, and its electrochemical properties were investigated. The carbonization process variables and the resulting powder properties were examined. The as-prepared activated carbon electrode exhibited pseudo-capacitive behavior and achieved a specific capacitance of 186 F g(-1) at 1 A g(-1). After 7000 cycles of charge-discharge testing, the initial capacitance retention rate was 95.6%. It is predicted that capacitor materials made from coconut shell will have better energy storage performance than traditional carbon supercapacitors.
Article
Energy & Fuels
Vishwanath Hiremath, Alan Christian Lim, Jeong Gil Seo
Summary: This study focuses on the conversion of cellulose pulp into honeycomb-like activated carbon, which shows superior electrochemical performance in capacitive-type material for supercapacitors. By optimizing the design and fabricating symmetric supercapacitors with high energy and power densities, it can effectively power electronic devices for a prolonged period, indicating its potential for practical applications in energy storage.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Monojit Mondal, Dipak Kumar Goswami, Tarun Kanti Bhattacharyya
Summary: The study focuses on synthesizing activated porous carbon using a high-temperature controlled heating process in an inert atmosphere with bio-waste materials' KOH activation process. The activated porous carbon exhibits high specific surface area, specific capacitance, and long cycle stability, making it a prospective candidate for new functional materials in energy storage applications.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Engineering, Chemical
Mohammed Jalalah, Siddheswar Rudra, Belqasem Aljafari, Muhammad Irfan, Saleh S. Almasabi, Turki A. Alsuwian, Akshay A. A. Patil, Arpan Kumar Nayak, Farid A. Harraz
Summary: In this study, heteroatom-doped porous activated carbon nanoflakes were synthesized from sustainable biomass, showing excellent specific capacitance and cycling stability, making them suitable for energy storage applications.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Multidisciplinary Sciences
Mitat Akkoc, Siraj Khan, Hande Yuce, Nese Basak Turkmen, Seyma Yasar, Sedat Yasar, Ismail Ozdemir
Summary: A series of benzimidazolium-based N-heterocyclic carbene precursors and their silver complexes were synthesized and tested for anticancer and cytotoxic activity. Six complexes showed high cytotoxicity against cancer cells and low toxicity against healthy cells, making them potential lead compounds. Molecular docking studies and ADME property predictions were conducted to explore their potential as anticancer drug candidates.
Article
Chemistry, Applied
Nesrin Bugday, Sedat Yasar, Serdar Altin, Ozgur Duygulu, Yunus Onal
Summary: A novel magnetic nanoporous carbon composite (Cu/Co@NPC) material, synthesized by calcining copper-doped amorphous zeolitic imidazolate framework (Cu/Co@aZIF), was used as an efficient catalyst for azide-alkyne cycloaddition (AAC) reaction and reduction reaction of nitrophenol (RRN) under air in water. Excellent yields of related products were synthesized in a short reaction time using this recyclable Cu/Co@NPC nanocatalyst, which showed a slight decrease in catalytic efficiency of 6% and 22% in RRN and AAC reactions, respectively.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Erdinc Oz, Serdar Altin, Sevda Avci
Summary: The increasing demand for energy has driven the focus on improving energy storage systems, particularly due to the rising costs of lithium-ion batteries and the interest in sodium-ion batteries. Na0.44MnO2 with tunnel structures has received attention, but structural degradation remains a challenge. This study proposes a one-step heat treatment with Ni substitution to improve the performance of Na0.44MnO2, showing promising results for practical applications in sodium-ion batteries.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
S. Ecer, S. Altundag, S. Altin, S. Avci
Summary: The synthesis technique is found to be the main factor responsible for the emergence of P2 and P3 phases in layered cathode materials for Na-ion batteries. Samples with only P3 phase exhibit the highest initial capacity, while samples with only P2 phase show stable cycling performance.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Chemistry, Physical
S. Altin, S. Altundag, E. Altin, D. E. P. Vanpoucke, S. Avci, M. N. Ates
Summary: This study investigates the structural and electrochemical properties of P2-type Na0.67Mn1-xCuxO2 (where x = 0.20-0.50) through various techniques. X-ray diffraction analysis demonstrates a reduction in unit cell volume upon Cu substitution. Cu substitution also affects the cyclic voltammetry behavior, leading to new redox reactions. The best electrochemical performance is achieved when x = 0.35 in a P2-type Na0.67Mn1-xCuxO2 cathode material, as observed through galvanostatic cycling measurements at room temperature. The diffusion rate of Na ions is highly dependent on the environmental temperature. Changes in valence state and local structures of P2-type Na0.67Mn1-xCuxO2 during charge/discharge are examined using operando X-ray absorption spectroscopy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
S. Altundag, S. Altin, S. Yasar, E. Altin
Summary: Chronoamperometry and galvanostatic procedures were used to prepare NaFePO4 cathodes by LiFePO4-based ion exchange approach. The structural and electrochemical properties of the obtained materials were investigated. XRD, XPS and EDX-dot mapping analyses confirmed the successful replacement of Na-ions with Li-ions. The diffusion rate of Na-ions in the cell was found to be higher at higher temperatures. The first capacities for C/10 and 1C rates at room temperature were 140mAh/g and 60mAh/g, respectively.
Article
Energy & Fuels
Emine Yalman, Sebahat Altundag, Mustafa Goktan Aydin, Yunus Onal, Tolga Depci, Hasan Tekbas, Fatih Bulut, Sedat Yasar, Serdar Altin
Summary: Rod-shaped hard carbon materials with over 99% purity are successfully synthesized from the waste of firefighter costumes, and their structural properties are analyzed using spectroscopic techniques. The galvanostatic cycling tests show that temperature directly affects the capacity and capacity fade values. A high-rate consumption of sodium ions during the initial cycles is observed, and an electrochemical treatment presodiation technique is implemented to compensate for the inefficiency. The optimum presodiation condition for producing Na0.67Mn0.5Fe0.45Ti0.07O2/presodiated hard carbon full cells is investigated, and the cost analysis for commercializing the battery pack in electric-powered cars is evaluated using BatPaC software.
Article
Engineering, Electrical & Electronic
Zeynep Melek Oktay, Yunus Onal, Tolga Depci, Sebahat Altundag, Serdar Altin, Sedat Yasar, Emine Altin
Summary: Hard carbon is successfully fabricated using biomass of Prunusarmeniaca seed shells, and its structural properties are examined by different spectroscopic techniques. The material is pyrolyzed at varying temperatures to achieve necessary conductivity and surface area for anode electrode in Na-ion batteries. The produced hard carbon shows promising properties and can be used in commercial Na-ion batteries.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Erdinc Oz, Serdar Altin, Sevda Avci
Summary: In this study, a single-step synthesis of Na0.44MnO2/Na0.7MnO2.05 composite material with cobalt substitution was conducted, and the changes in crystal structure and physical and electrochemical properties of the composite and bare structures were investigated. The results show that the 1% Co-substituted composite sample (CO10) exhibits superior rate and cyclic performance compared to the undoped Na0.44MnO2 (NMO) and 5% Co-substituted (CO50) samples after 100 cycles. The composite material suppresses cathode phase transformations, prevents structural degradation, and achieves better battery performance.
Article
Electrochemistry
Nermin Taskiran, Sebahat Altundag, Violeta Koleva, Emine Altin, Muhammad Arshad, Sevda Avci, Mehmet Nurullah Ates, Serdar Altin, Radostina Stoyanova
Summary: A new cathode material based on layered Na-2/3(Mn1/2Fe1/2)O-2 was designed using Co substitution and MgO treatment strategies, which showed high sodium storage capacity and cycling stability. The structure and oxidation state of the oxides were examined, and their ability to store sodium was analyzed. The results revealed that the MgO treatment played a crucial role in improving the lattice stability during cycling.