Article
Chemistry, Analytical
Gabriel Zeplin, Eduardo G. C. Neiva
Summary: Different binary and ternary nanocomposites were synthesized among graphene oxide, manganese dioxide nanoparticles, and polyaniline using KMnO4 as an oxidizing agent and precursor for MnO2. The ratio of constituents depended on HCl concentration and aniline amount. The nanocomposites with higher MnO2 proportion showed the best performance as supercapacitors and electrochemical sensors, reaching capacitances of up to 150 F g(-1) and low detection limits for H2O2.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
Betuel Ok, Metin Gencten, Melih B. Arvas, Yucel Sahin
Summary: Vanadium-doped polyaniline and vanadium-doped polypyrrole were synthesized using a chemical method with vanadium species as an oxidant for the first time. The prepared vanadium-doped conductive polymers were characterized spectroscopically, microscopically, and physically. XPS and FT-IR analyses confirmed the covalent and adsorbed presence of vanadium species in the conductive polymers. These vanadium-doped conductive polymers were then used as electrode materials in asymmetric supercapacitors, exhibiting a highest areal capacitance of 453 mF.cm(-2) at a scanning speed of 5 mV.s(-1). In long-cycle tests, the system retained 70.9% of its initial capacity after 1000 cycles. This study, demonstrating the supercapacitor application of vanadium-doped conductive polymers, highlights their high capacitance value and provides a basis for future research.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Guangxu Xu, Jie Zhao, Jinshi Yuan, Yuling Zhao, Hang Yin, Fengyun Wang, Jie Tang, Jianmin Zhang
Summary: The study successfully prepared three-dimensional hierarchical cobalt oxide/reduced graphene oxide composites via a one-pot microwave assisted hydrothermal process, investigating the effects of rGO content on the composite material's performance. By adding graphene oxide, it was found that the size of the cobalt oxide nanoparticles could be effectively controlled, leading to significant impact on the electrochemical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Energy & Fuels
Marwa Ben Hadj Said, Khaled Charradi, Zakarya Ahmed, Hubert Cachet, Catherine Debiemme-Chouvy, Qana A. Alsulami, Sami Boufi, Sherif M. A. S. Keshk, Radhouane Chtourou
Summary: A ternary composite electrode consisting of graphene oxide, cellulose hydrogel, and polyaniline was synthesized and electrochemically characterized. It showed significantly enhanced cycling stability and improved capacitance, indicating a synergistic effect of cellulose hydrogel on PANi-GO.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Sajedeh Rezapour Charandabinezhad, Hamed Asgharzadeh, Nasser Arsalani
Summary: The ternary composites of rGO/Fe3O4/PANI exhibit superior electrochemical performance, with high specific capacitance and excellent cyclic stability, due to the unique nanostructure and synergic interaction among rGO nanoplatelets, Fe3O4 nanoparticles, and PANI chains.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Jasvir Dalal, Sanket Malik, Sajjan Dahiya, Rajesh Punia, Kuldeep Singh, A. S. Maan, S. K. Dhawan, Anil Ohlan
Summary: This study presents a facile method for synthesizing Ni0.5Co0.5Fe2O4 nanoparticles decorated reduced graphene oxide (RGO) nanocomposites, which exhibit enhanced shielding effectiveness and absorption performance. The findings suggest that the interface linkages and synergy between Ni0.5Co0.5Fe2O4 and RGO play a crucial role in improving the microwave absorbing properties, thereby advancing the design of lightweight microwave absorbers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Ningfang Zhou, Gang Luo, Wei Qin, Chun Wu, Chuankun Jia
Summary: A composite of boron-doped cobalt oxide nanorods coupled with reduced graphene oxide was synthesized by a one-step hydrothermal method, and its electrochemical performance for sodium ion storage was investigated. The results showed that boron doping and the introduction of graphene can improve the cycling stability and storage capacity of the electrode material. Therefore, the doping of boron and introduction of graphene have promising potential in optimizing the electrochemical performance of anode materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
V. M. Vimuna, B. N. Bessy Raj, S. P. Chandini Sam, T. S. Xavier
Summary: In this study, MnO2/rGO composite materials were successfully fabricated using a hydrothermal method at a reaction temperature of 120 degrees C, exhibiting excellent electrochemical performance in supercapacitors. The composite showed a large specific capacitance of 413 Fg(-1) and high specific energy and power capabilities. The supercapacitor also demonstrated impressive efficiency and cycle stability after 5000 charge/discharge cycles at 3 mA current, highlighting its potential for energy storage applications.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Wen Sun, Nihat Ege Sahin, Di Sun, Xu Wu, Carlos Munoz, Jivan Thakare, Ted Aulich, Jin Zhang, Xiaodong Hou, Nuri Oncel, David Pierce, Julia Xiaojun Zhao
Summary: A facile, environmentally friendly, and cost-effective one-pot method for the synthesis of a ruthenium-based nitrogen reduction nanocatalyst using reduced graphene oxide (rGO) as a matrix has been developed. The nanocatalyst showed higher catalytic activity and lower energy consumption compared to conventional iron catalysts for ammonia synthesis. The use of rGO as a matrix promoted the electrochemical synthesis of ammonia due to its excellent electrical and thermal conductivity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Yongzhi Wang, Guorong Hu, Yanbing Cao, Zhongdong Peng, Ke Du
Summary: A simple and safe synthesis route for the large-scale production of graphene has been developed in this study, using a one-pot hydrothermal method and high-temperature thermal reduction to produce reduced graphene oxide (RGO). This method avoids the need for complex temperature control, dilution operations, and enables the recycling of sulfuric acid, simplifying the purification process.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Yunfei Shen, Zhen Yang, Heng Lv, Jiahui Ye, Kaisheng Sun, Jianxiang Pang, Long Chen
Summary: This study reports a convenient method for preparing non-stoichiometric cobalt sulfide via one-pot solvothermal method, and explores the influence of DMF and ethanol on the microstructure and properties of CoxSy. The results show that CoxSy(DMF) exhibits better electrochemical performance and cycling stability compared to CoxSy(ethanol), indicating good application prospects in the field of supercapacitors.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Anjana Anandan Vannathan, Tatinaidu Kella, Debaprasad Shee, Sib Sankar Mal
Summary: A simple method of using two polyoxomolybdate-doped polyindole composites as electrodes for electrochemical supercapacitors is reported. The composites exhibit higher capacitance, faster charge/discharge rates, and greater cycle stability, making them promising candidates for supercapacitor applications.
Article
Nanoscience & Nanotechnology
Ashwini G. Patil
Summary: The research developed a novel nanocomposite using microbes, showing excellent antibacterial activity with controlled release and remarkable stability in vitro.
Article
Nanoscience & Nanotechnology
Fangbo Yao, Wenruo Li, Shabrina Khainunni, Jiaojiao Ma, Choji Fukuhara, Chang Yi Kong
Summary: In this study, a simple and environmentally friendly hydrothermal method for synthesizing fragment-reduced graphene oxide (FrGO) without the use of reducing agents was reported. The FrGO was used as an electrode material for a supercapacitor. The results showed that the addition of certain additives improved the material's characteristics, leading to a higher specific capacitance and better stability. This research provides guidance for the development of electrode materials for various supercapacitor devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Xiao-Ming Yue, Zi-Jing Liu, Cui-Cui Xiao, Mei Ye, Zan-Peng Ge, Cheng Peng, Zi-Yi Gu, Jun-Sheng Zhu, Shuang-Quan Zhang
Summary: The study utilized a hydrothermal and calcination method to prepare Co3O4/rGO composite, which exhibited excellent performance in electrochemical supercapacitors. This was attributed to the synergy between rGO and Co3O4, as well as the unique three-dimensional structure obtained through changing the hydrothermal conditions.
Article
Materials Science, Multidisciplinary
Surabhi Kamal, Sridharan Balu, Selvakumar Palanisamy, Kasimayan Uma, Vijayalakshmi Velusamy, Thomas C. K. Yang
RESULTS IN PHYSICS
(2019)
Article
Chemistry, Physical
Kasimayan Uma, Siewhui Chong, Singaravelu Chandra Mohan, Kandasamy Jothivenkatachalam, Thomas C. -K. Yang, Ja-Hon Lin
Article
Multidisciplinary Sciences
Uma Kasimayan, Arjun N. Adarajan, Chandra Mohan Singaravelu, Guan-Ting Pan, Jothivenkatachalam Kandasamy, Thomas C. . -K. Yang, Ja-Hon Lin
SCIENTIFIC REPORTS
(2020)
Article
Polymer Science
Kasimayan Uma, Kesava Munusamy, Elavarasan Munirathinam, Thomas C-K Yang, Ja-Hon Lin, Dinakaran Kannaiyan
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2020)
Article
Crystallography
Kasimayan Uma, Elavarasan Muniranthinam, Siewhui Chong, Thomas C. -K Yang, Ja-Hon Lin
Article
Engineering, Environmental
Kasimayan Uma, Balu KrishnaKumar, Gung-Tin Pan, Thomas C-K Yang, Ja-Hon Lin
JOURNAL OF WATER PROCESS ENGINEERING
(2020)
Article
Chemistry, Physical
Kasimayan Uma, Shin-Wen Chen, Balu KrishnaKumar, Chellappa Jeyaprabha, Thomas C. -K. Yang, Ja-Hon Lin
Summary: The CdS nanostar decorated SiO2/TiO2-ST spheres showed enhanced photocatalytic activity under visible light irradiation compared to the SiO2-CdS spheres, attributed to providing more active sites for dye adsorption and reducing electron-hole recombination.
Review
Biochemistry & Molecular Biology
Dexter Hoi Long Leung, Yin Sze Lim, Kasimayan Uma, Guan-Ting Pan, Ja-Hon Lin, Siewhui Chong, Thomas Chung-Kuang Yang
Summary: This review article discusses the utilization of exoelectrogens in biofilm to generate power in microbial fuel cells (MFC) and recent progress in genetic modifications of S. oneidensis for enhanced power generation and wastewater treatment potential in MFCs. Studies on identifying genes responsible for extracellular electron transfer (EET) in S. oneidensis and strategies for enhancing EET efficiency through genetic engineering are highlighted.
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2021)
Article
Engineering, Chemical
Munirathinam Elavarasan, Kasimayan Uma, Thomas C. -K. Yang
Summary: An efficient method to prepare In2O3/TiO2 heterojunction photocatalysts with different micro-structures was reported, showing that ITNC and ITNR exhibited higher photocatalytic activity due to the formation of semiconductor-semiconductor heterojunction, leading to lower recombination rate of electron-hole pair. Various physicochemical tests were conducted to characterize the materials and verify their photocatalytic properties.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Engineering, Chemical
Kasimayan Uma, Chandra Mohan Singaravelu, Veerappan Kavinkumar, Kandasamy Jothivenkatachalam, Ja-Hon Lin
Summary: A PT/In heterostructured nanocomposite was fabricated and found to be an excellent photocatalyst for degrading Acid Blue dye under UV-Visible light illumination. The enhanced photocatalytic performance is attributed to the synergistic effect of the heterojunction between TiO2 and In2O3, as well as a reduction in the recombination rate, with high stability demonstrated even after five consecutive cycles.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Physical
Veerappan Kavinkumar, Atul Verma, Kasimayan Uma, Subramanian Moscow, Kandasamy Jothivenkatachalam, Yen-Pei Fu
Summary: The synthesized plasmonic metal-induced Bi2WO6/TiO2 ternary composite exhibited excellent catalytic activity for Rhodamine B photodegradation, high current density for oxygen and hydrogen evolution reactions, and better electrocatalytic activity for dopamine detection due to the synergistic effects of noble metal incorporation into the semiconductor. Additionally, the composite showed antibacterial potential against Escherichia coli, showcasing promising prospects for photocatalytic, electrochemical, sensing, and antibacterial applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Ja-Hon Lin, Tse-Ming Tsai, Yi-Chung Yang, Wei-Rein Liu, Bi-Hsuan Lin, Kasimayan Uma, Yung-Chi Wu, Wen-Feng Hsieh
Summary: High periodicity non-polar ten-pair ZnO/Zn0.8Mg0.2O multiple quantum wells were prepared via pulsed-laser deposition on r-plane sapphire, demonstrating anisotropic optical properties with energy difference between splitting valence bands. The amplified spontaneous emission from the non-polar MQWs showed higher efficiency under perpendicular pump condition, with linearly polarized ASE and dominant ex-ex scattering mechanism. The temperature-dependent ASE revealed red shift in emission peak and a temperature-insensitive characteristic temperature of -124 K.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Lung-Chien Chen, Sih-An Chen, Kasimayan Uma, Chih-Hsun Chiang, Jia-Xun Xie, Zong-Liang Tseng, Shun-Wei Liu
Summary: This study utilizes perovskite quantum dots (PQDs) as emissive materials to enhance the performance of upconversion devices (UCDs). By optimizing the device structure and the materials involved, high luminance, current gains, photon-to-photon conversion efficiency, and low turn-on voltage were achieved.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
I-Sheng Hsu, Chih-Chien Lee, Abdul Khalik Akbar, Kasimayan Uma, Shun-Wei Liu
Summary: Transparent photovoltaics (TPVs) have potential applications in see-through surfaces, but the limitations of existing TPV technologies have hindered their widespread implementation. In this study, a durable and cost-effective approach utilizing an air-cooling nanosecond laser processing system is proposed to enhance the performance of non-fullerene materials in organic photovoltaic systems. By controlling the optical transmission properties through hexagonal width processing and depositing a tungsten oxide buffer layer, a high average visible transmittance (AVT > 65%) is achieved with no color deviation. This treatment expands the applicability of TPVs and could lead to commercialization in the renewable energy market.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Jia-Huei Hsiao, Shih-Wen Chen, Bing-Yi Hung, Kasimayan Uma, Wei-Cheng Chen, Chi-Ching Kuo, Ja-Hon Lin