Article
Chemistry, Physical
Xiaodong Hong, Xu Wang, Yang Li, Jiawei Fu, Bing Liang
Summary: In this study, carbon nanosheets derived from potassium citrate (PC-Cs) were prepared via high-temperature carbonization method and used as sacrificial template for MnO2 nanosheets arrays generation. Sandwich structured MnO2/PC-Cs/MnO2 composite exhibited high capacitance and excellent cycling stability in supercapacitor applications. The composite's superior performance was attributed to the high fraction of MnO2 and nanosheets arrays structure, as well as the residual carbon layer enhancing electronic conductivity and long-term stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Energy & Fuels
Xinrong Lv, Lu Chen, Xiaoqin Min, Xiaoyun Lin, Yongnian Ni
Summary: A novel flower-like MnNi2O4-MnNi2S4 core@shell composite electrode with outstanding electrochemical performance has been successfully synthesized. The electrode exhibits high specific capacity and energy density, as well as good cycling performance. The core@shell structure of the electrode is expected to have significant potential for practical applications.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Nanoscience & Nanotechnology
Chenji Xia, Yijia Luo, Xiaoqing Bin, Bowen Gao, Wenxiu Que
Summary: Combining two-dimensional conductive MXene with transition metal oxide is a promising approach to improve the conductivity of metal oxide materials. In this study, we synthesized a MnO2/Ti3C2Tx composite electrode using a facile hydrothermal route, which showed improved morphology, conductivity, and electrochemical performance compared to the pure MnO2 electrode. The specific capacitance of the MnO2/Ti3C2Tx composite electrode reached 210.8 F.g(-1) at a scan rate of 2 mV.s(-1), while the pure MnO2 electrode only achieved 55.2 F.g(-1). The synthesis strategy presented in this work could contribute to the development and practical application of electrode materials for supercapacitors.
Article
Energy & Fuels
Geng Wei, Li Zhang, Jin Qian, Bo Yin, Xiaoming Zhang, Zhaomeng Wang, Haifu Huang, Shaolong Tang
Summary: Heteroatomic doping has a significant effect on improving the electrochemical energy storage of metal oxide electrode materials. In this study, Mo and S co-doped CoNiO2 material was successfully prepared and showed excellent supercapacitive properties and cycling stability. This co-doped material has the potential for application in supercapacitors.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Physical
Menghe Jiang, Ying Wang, Cuili Xiang, Yongjin Zou, Fen Xu, Lixian Sun, Dan Cai, Chua Yong Shen
Summary: In this study, MnxCoyO4 @MoS2 composites were obtained by coating flake MoS2 arrays on spherical MnxCoyO4 via hydrothermal and heat treatment methods. The MnxCoyO4 @MoS2 electrode material exhibited a specific capacitance of 1422 F g-1 at 1 A g-1 when x/y = 1:2, higher than that at x/y = 1:1 and 2:1. When assembled into an aqueous asymmetric supercapacitor, the proposed electrode material provided a specific capacitance of 131 F g-1 at 1 A g-1. After 5000 cycles, the electrode material showed a capacity retention of 85% and the device retained a specific power of 794 W kg-1 with 46.58 Wh kg-1. This electrode material design offers new ideas for the development of advanced electrodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Paper & Wood
Jincy Parayangattil Jyothibasu, Ruei-Hong Wang, Kenneth Ong, Juping Hillary Lin Ong, Rong-Ho Lee
Summary: Nanostructured manganese dioxide (MnO2) was homogeneously deposited on a regenerated cellulose/functionalized CNT (f-CNT) matrix through a direct redox reaction between potassium permanganate and carbon nanotubes (CNTs) in an acidic medium. The resulting cellulose/f-CNT/MnO2 composite films showed outstanding electrochemical performance as freestanding electrodes for supercapacitors, with a maximal areal capacitance of 7956 mF cm(-2) achieved for a high MnO2 content composite. The symmetric supercapacitor assembled using the cellulose/f-CNT/MnO2 composite film exhibited high capacitance, energy density, and power density. The simple and environmentally friendly synthetic procedure can be readily scaled up for bulk synthesis.
Article
Materials Science, Multidisciplinary
Liyang Lin, Susu Chen, Xueli Qi, Jianyao Yao, Lijian Meng, Wei Chen
Summary: In this study, a novel h-BN/beta-MnO2 nanocomposite was prepared and demonstrated to be a superior electrode material for supercapacitors, with high specific capacitance and excellent cycling stability. The electrochemical performance of the nanocomposite was analyzed using various techniques such as XRD, SEM, TEM, CV, GCD, and EIS, showing promising results for energy storage applications.
Article
Chemistry, Multidisciplinary
Yulin Xin, Shixiang Lu, Wenguo Xu, Shasha Wang
Summary: In this study, a honeycomb-structured composite electrode material was prepared using hydrothermal synthesis and annealing process. The synthesized material exhibited excellent electrochemical properties and conductivity. It outperformed the individual use of praseodymium oxide and cobalt oxide in supercapacitors.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Energy & Fuels
Lukai Fan, Jinghao Zhao, Fengyang Jing, Xiujuan Qin, Guangjie Shao
Summary: The construction of MnO2@NiMnxOy-delta core-shell heterostructure can enhance the rate capacity and stability of pseudocapacitor materials. The introduction of oxygen vacancies in the nanosheets can accelerate electron/ions transport, and the synergistic effect between one-dimensional nanowires and two-dimensional nanosheets can adjust the interfacial behavior of the electrode reaction, leading to superior cyclic stability.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Electrical & Electronic
Yuanqiang Zhu, Hui Xu, Jing Tang, Xudong Jiang, Yuanhai Bao, Yong Chen
Summary: The ternary hybrid material CF@gamma-MnO2/PANI exhibits high capacitance and cycling stability, making it a promising candidate for supercapacitor applications. The efficient utilization of MnO2 and PANI is achieved by supporting gamma-MnO2 nanoparticles on the surface of CF and coating them with PANI.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Naresh Vangapally, Kiran Kumar, Amit Kumar, Surendra K. Martha
Summary: The efficient synthesis of MnO2 nanorods and carbon composite from table sugar precursors facilitates the development of high-performance supercapacitors. The resulting C/MnO2 composite demonstrates superior electrochemical performance with good capacitance retention and high energy density.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Xuxia Ling, Guoliang Zhang, Zhu Long, Xuefeng Lu, Zhibin He, Jie Li, Yuheng Wang, Dan Zhang
Summary: The study proposes a novel method for preparing flexible electrode materials using polymer coating, which exhibits high specific capacitance and energy density in supercapacitors, with good cycling performance.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Physical
Yi Wang, Jie Wang, Dong Wei, Lan Xu
Summary: In this study, a multicore-shell ternary composite electrode material (MnO2@Ppy@NPCNFs) was prepared by using surface modification, which showed excellent electrochemical performances. The core-shell Ppy@N-doped porous carbon nanofibers (Ppy@NPCNFs) were used as a substrate, and MnO2 was loaded on the substrate by hydrothermal synthesis. The optimal parameters for the hydrothermal growth of MnO2 on Ppy@NPCNFs were explored, and the resulting MnO2@Ppy@NPCNFs exhibited high specific capacitance and good capacitance retention.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Weiliang Zeng, Hongying Quan, Jiangyan Meng, Wei Wei, Meng Liu, Dezhi Chen
Summary: By utilizing N2-plasma treatment, a high mass loading N-MnO2 electrode was successfully prepared, showing excellent capacitive performance and cycling stability. Under 20 mA cm-2, it exhibited capacitance retention rates of 71.8% and 96% respectively.
APPLIED SURFACE SCIENCE
(2022)
Article
Energy & Fuels
Yu Huang, Baoqing Wang, Fu Liu, Heguang Liu, Shijie Wang, Qianqian Li, Jipeng Cheng, Li Zhang
Summary: By fabricating rambutan-like activated carbon sphere/carbon nanotube (ACS/CNT) composites as electrode materials with a unique three-dimensional microstructure, high specific capacitance and excellent cyclic performance have been achieved. The growth of curved carbon nanotubes on the surface of activated carbon spheres contributes to superior electrical conductivity and specific surface area in the composite electrodes.
Article
Engineering, Electrical & Electronic
Chandu V. V. Muralee Gopi, Sangaraju Sambasivam, Rajangam Vinodh, Hee-Je Kim, Ihab M. Obaidat
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Materials Science, Multidisciplinary
Sang-Hyo Kim, Rajangam Vinodh, Chandu V. V. Muralee Gopi, Venkata Guru Raghavendra Kummara, Sangaraju Sambasivam, Ihab M. Obaidat, Hee-Je Kim
Article
Optics
Sangaraju Sambasivam, Pardha Saradhi Maram, Chandu V. V. Muralee Gopi, Ihab M. Obaidat
Review
Computer Science, Information Systems
Kummara Venkat Guru Raghavendra, Kamran Zeb, Anand Muthusamy, T. N. V. Krishna, S. V. S. V. Prabhudeva Kumar, Do-Hyun Kim, Min-Soo Kim, Hwan-Gyu Cho, Hee-Je Kim
Article
Chemistry, Physical
Rajangam Vinodh, Chinnadurai Deviprasath, Chandu V. V. Muralee Gopi, Venkata Guru Raghavendra Kummara, Raji Atchudan, Tansir Ahamad, Hee-Je Kim, Moonsuk Yi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Energy & Fuels
Kamran Zeb, Muhammad Saqib Nazir, Iftikhar Ahmad, Waqar Uddin, Hee-Je Kim
Summary: This paper presents successful control of DC-link voltage, active power, and reactive power in a transformerless grid-connected inverter using Adaptive-PI and Adaptive-Sliding Mode Controller. The system also utilizes a PR controller based on RHC and a SOGI-based PLL for improved performance.
Article
Energy & Fuels
Sangaraju Sambasivam, Chandu V. V. Muralee Gopi, Hammad Mueen Arbi, Yedluri Anil Kumar, Hee-Je Kim, Salem Al Zahmi, Ihab M. Obaidat
Summary: Binder-free hierarchical core-shell-like CoMn2O4@MnS heterostructures have been successfully grown on the surface of nickel foam, providing superhighways for ultra-fast transfer of electrons and ions. The as-prepared core-shell-like CoMn2O4@MnS NWAs electrode exhibits outstanding specific capacity, remarkable rate capability, and excellent cycling stability, making it an advanced battery-type electrode material for supercapacitor applications.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Waqar Uddin, Tiago D. C. Busarello, Kamran Zeb, Muhammad Adil Khan, Anil Kumar Yedluri, Hee-Je Kim
Summary: This paper presents a control method for output and circulating currents of modular multilevel converter, utilizing arm currents to control DC and AC components separately. The effectiveness of the proposed control scheme is demonstrated through comparative results and simulation on a three-phase, five-level MMC in MATLAB/Simulink.
Article
Chemistry, Multidisciplinary
Sangaraju Sambasivam, K. V. G. Raghavendra, Anil Kumar Yedluri, Hammad Mueen Arbi, Venkatesha Narayanaswamy, Chandu V. V. Muralee Gopi, Byung-Chun Choi, Hee-Je Kim, Salem Alzahmi, Ihab M. Obaidat
Summary: The novel MnCo2O4/NiO nanostructure prepared by a simplistic chemical bath deposition method has shown promising results as a binder-free electrode in supercapacitors. The electrode exhibited high specific capacity and excellent cycling reliability, making it a favorable option for efficient supercapacitors and energy storage applications.
Article
Polymer Science
Rajangam Vinodh, Raji Atchudan, Hee-Je Kim, Moonsuk Yi
Summary: This review presents the recent development of polysulfone-based electrolyte membranes and their composites for fuel cell applications. The influence of fillers on the performance of electrolyte membranes is discussed, along with the key issues of enhancing ionic conductivity and chemical stability. The future research directions for polymer electrolyte membranes are also briefly summarized.
Article
Computer Science, Information Systems
Gwang-Ho Lee, Do-Hyun Kim, Min-Soo Kim, Hee-Je Kim, Sung-Shin Kim
Summary: This research successfully reduced the measurement error of TRO concentration by calibrating LED modules and optimizing LED aging, resulting in a significant improvement in measurement accuracy and precision to 0.10% and 0.85%, respectively. Experimental results confirmed the improvement of non-uniform LED light, and the standard values for TRO concentration measurement were met.
Article
Computer Science, Information Systems
Do-Hyun Kim, Min-Soo Kim, Kandasamy Prabakar, Hee-Je Kim
Summary: Fast charging technology has gained attention due to the increased use of batteries in electric vehicles, light electric vehicles, and energy storage systems. However, fast charging can lead to issues such as fire, heat, and battery performance degradation. This paper proposes a real-time monitoring system to efficiently manage the charger and battery status.
Article
Chemistry, Physical
Rajangam Vinodh, Rajendran Suresh Babu, Raji Atchudan, Hee-Je Kim, Moonsuk Yi, Leandro Marques Samyn, Ana Lucia Ferreira de Barros
Summary: This study presents the synthesis of porous NiO nanoparticles through a simple hydrothermal method and demonstrates their excellent electrochemical performance. The unique morphology of NiO plays a crucial role in enabling efficient ion transport, shortening electron and ion pathways, and providing active sites for electrochemical reactions. Moreover, the assembled asymmetric supercapacitor (ASC) composed of NiO-300 and activated carbon (AC) shows outstanding supercapacitive performance.
Review
Chemistry, Multidisciplinary
Rajangam Vinodh, Rajendran Suresh Babu, Sangaraju Sambasivam, Chandu V. V. Muralee Gopi, Salem Alzahmi, Hee-Je Kim, Ana Lucia Ferreira de Barros, Ihab M. Obaidat
Summary: Supercapacitors, with their excellent capacitance and rate efficiency, extended durability, and cheap materials price, are regarded as one of the most promising energy storage devices. The choice of electrode materials is critical for the performance of supercapacitors. The combination of polyaniline (PANI) and metal-organic frameworks (MOFs) as electrode materials shows additional benefits and is predicted to be the next-generation electrode materials for efficient supercapacitors.
Article
Computer Science, Information Systems
Min-Soo Kim, Do-Hyun Kim, Hee-Je Kim, Kandasamy Prabakar
Summary: In this paper, a novel strategy for monitoring PV junction boxes based on LoRa technology is proposed. The wireless transmission of data collected from the PV junction boxes enables real-time monitoring and display of the received data on an LCD screen. The system shows stable communication reception and excellent performance in maintaining signal strength and packet error rate, even in non-line-of-sight environments.