Article
Materials Science, Multidisciplinary
Dilek Vatansever, Murside Haciismailoglu
Summary: A cheap, rapid and easy way to fabricate supercapacitor electrodes was found by electropolymerizing polypyrrole (PPy) films on pencil graphite electrodes (PGE). The PGE/PPy symmetrical supercapacitor exhibited high specific capacitance, stable cycling performance, and high energy and power density values.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Mohammad Saleh Attayeenia, Rasool Amini, Shirin Vardak
Summary: Pencil graphite electrodes modified with silver nanoparticles were used for rapid and sensitive detection of hydrogen peroxide. The sensor showed a linear response within a certain concentration range and exhibited high selectivity towards interfering substances.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Materials Science, Multidisciplinary
Zaklina Z. Tasic, Marija B. Petrovic Mihajlovic, Ana T. Simonovic, Milan B. Radovanovic, Milan M. Antonijevic
Summary: Electrochemical methods offer advantages for analysis and detection of chemical compounds, with pencil graphite electrodes proving to be an efficient and cost-effective material for detecting low concentrations of pharmaceutical compounds like paracetamol around 10(-9) M.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Chemical
Ya-Ge Zhang, Ling-Zhi Huang, Qi Yuan, Ming-Guo Ma
Summary: This study fabricates flexible, ultrathin, and multifunctional polypyrrole/cellulose nanofiber composite films using a one-step soak and polymerization method. The composite films exhibit excellent flexibility, mechanical strength, and toughness due to their dense sandwich structure and strong interfacial interaction. Furthermore, the composite film electrodes with quaternary amine functionalized cellulose nanofibers show the highest specific mass capacitance and specific areal capacitance compared to other types of electrodes. Additionally, the composite films with sandwich structure demonstrate excellent photothermal conversion properties. These findings provide a feasible and versatile method for preparing multifunctional composite films with potential applications in various energy storage fields.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2023)
Article
Electrochemistry
Sabina Yeasmin, Simi Talukdar, Debajyoti Mahanta
Summary: Graphitic layer of carbon deposited on cellulose paper via pencil drawing, enhanced by polyaniline nanofibers, results in all-solid-state symmetric supercapacitors with outstanding performance, exhibiting specific capacitance of 28.37 F g(-1) and excellent cyclic stability.
ELECTROCHIMICA ACTA
(2021)
Article
Engineering, Chemical
Iulia Gabriela David, Mihaela Buleandra, Dana Elena Popa, Mihaela Carmen Cheregi, Vasile David, Emilia Elena Iorgulescu, Georgiana Oana Tartareanu
Summary: With the ever-growing production of pharmaceutical compounds, there is a need for facile and reliable analysis methods. Electrochemical techniques are among the simplest and fastest instrumental techniques with good performance characteristics. The pencil graphite electrode (PGE) has gained increasing interest in recent years due to its inherent electrochemical and economic advantages. This paper reviews scientific reports published in the last 10 years on the electroanalysis of pharmaceutical compounds using disposable eco- and user-friendly PGEs in different matrices, discussing their characteristics, designs, applications, and performance parameters, emphasizing their advantages and limitations.
Article
Chemistry, Physical
Maodan Xu, Xixin Wang, Ziqing Li, Xu Tan, Mengyao Yang, Jianling Zhao
Summary: By combining defect engineering and lattice restoring agents, the graphitic nitrogen content in graphene sheets can be tuned over a wide range at low temperature. This modified graphene shows improved ion diffusion capacity and specific capacitances, making it suitable for high-performance supercapacitors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Han Qiang, Wen He, Feiyu Guo, Jizhou Cao, Rui Wang, Zhihao Guo
Summary: In this study, self-supporting flexible supercapacitor electrodes made of TOCN/RGO/PPy film were prepared and exhibited excellent electrochemical performance and mechanical stability. The electrode showed high capacitance retention in charge-discharge cycles and bending tests. Furthermore, a solid-state supercapacitor assembled with CNF hydrogel films displayed outstanding specific capacitance and energy density.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Analytical
Budi Riza Putra, Ulfiatun Nisa, Rudi Heryanto, Munawar Khalil, Fitri Khoerunnisa, Aga Ridhova, Yudi Nugraha Thaha, Frank Marken, Wulan Tri Wahyuni
Summary: A highly selective electrochemical sensor based on a molecularly imprinted polymer (MIP) was developed for uric acid detection in the presence of dopamine as an interference molecule. This sensor showed excellent analytical performance, good reproducibility, and stability, demonstrating highly selective detection of uric acid in the presence of interfering species. The sensor is expected to be used in early-stage disease diagnosis.
Article
Chemistry, Physical
Ahmed Samir, Abd Elhamid M. Abd Elhamid, Aref Eliwa, Essam El Din Aboul Zahab, Mohamed B. Zahran, Mahmoud M. Sayed
Summary: In this study, a hydrothermal strategy was used to grow molybdenum sulfide micro flower-like structures on reduced graphene oxide sheets. By incorporating potassium iodide into the electrolyte, the fabricated supercapacitors achieved high power density, energy density, and cycle stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Bing Bai, Linlin Qiu, Yong Wang, Xingyu Jiang, Jiaxin Shui, Yongfeng Yuan, Lixin Song, Jie Xiong, Pingfan Du
Summary: This study presents a scalable method for fabricating composite nanofibers/graphene hybrid fibers as electrodes for flexible supercapacitors. These electrodes exhibit high specific capacitance and durable cycle stability due to their ultrahigh specific surface area and exceptional conductivity. The CNGF30 electrode shows excellent electrochemical performance in terms of areal-specific capacitance (409.1 mF/cm2) and cycle stability (97.7% over 10 000 cycles). Moreover, the well-designed CNGF30 offers remarkable mechanical flexibility for assembled supercapacitors.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Bing Bai, Linlin Qiu, Yong Wang, Xingyu Jiang, Jiaxin Shui, Yongfeng Yuan, Lixin Song, Jie Xiong, Pingfan Du
Summary: In this study, a scalable method was developed to produce hierarchical porous carbon nanofibers/graphene hybrid fibers for flexible supercapacitor electrodes. These electrodes exhibited excellent electrochemical performance and mechanical flexibility.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Yu Wang, Shijin Gan, Jie Meng, Jingjing Yang, Jin Li, Hao Liu, Lei Shi, Li Chen
Summary: The study introduces a low-cost and large-scale method for producing high-performance supercapacitor yarn electrodes, achieving fiber wrapping and nanoparticle deposition to enhance electrochemical performance; the supercapacitors exhibit excellent stability and flexibility, offering broad prospects for the development of wearable smart textiles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Yunhe Zhao, Yang Li, Muhammad Ihsan-ul-haq, Nauman Mubarak, Mengyang Xu, Xianying Qin, Tian-Shou Zhao, Jang-Kyo Kim
Summary: The electrochemical performance of carbon nanofiber electrodes in vanadium redox flow batteries can be enhanced by optimizing their morphological and physical properties. This can be achieved by modifying the precursor composition and carbonization temperature, resulting in tailored surface area, porosity, and electrical conductivity. The optimized carbon nanofibers exhibit high wettability and activity, leading to improved electrochemical performance in vanadium redox flow batteries.
Article
Materials Science, Multidisciplinary
Minmin Zhu, Anwen Zhao, Can Wei, Fuying Ren, Yida Zhao, Yiping Bao, Huilu Guo
Summary: In this study, a two-step process for hybrid graphene-NiW nanofibers (Gr-NiW NFs) transparent electrodes was developed using the alloying technique. The alloying of NiW NFs significantly improves their mechanical performance and reduces the growth temperature of graphene. The resulting Gr-NiW network electrode exhibits excellent transmittance and conductivity, which can be tailored by the growth temperature and the W content. Furthermore, a nanofiber-based pressure sensor using Gr-NiW/P(VDF-TrFE)/Gr-NiW NFs was demonstrated, showing high sensitivity and excellent operation stability. This work provides deep insights into the development of transparent graphene-based electrodes via alloy engineering.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Polymer Science
Yethadka Narahari Sudhakar, Muthu Selvakumar, Denthaje Krishna Bhat
Summary: This paper investigates the biodegradation of polymer blends composed of synthetic polymers and biopolymers. Four different methods are used to study the degradation performance, and the results show that the addition of biodegradable cellulose acetate butyrate effectively promotes the degradation of synthetic polymers without significant compromise on their properties.
Article
Chemistry, Multidisciplinary
K. A. Vishnumurthy, S. Pramodini, P. Poornesh, K. K. Nagaraja, T. N. Ahipa
Summary: The present paper focuses on the synthesis and characterization of polyindole-ZnO nano composites for third order nonlinear optical applications. Polyindole was synthesized using oxidative polymerization technique and composites were prepared with different ZnO concentrations. The structural morphology of the polymer composite was studied using FESEM, XRD, and UV Visible spectroscopy. The newly prepared thin films showed excellent nonlinear absorption behavior and optical limiting power when exposed to He-Ne laser, making them potential candidates for optical limiting applications.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Sneha Kagatikar, Dhanya Sunil, Dhananjaya Kekuda, M. N. Satyanarayana, Suresh D. Kulkarni, Y. N. Sudhakar, Anoop Kishore Vatti, Aditya Sadhanala
Summary: This study focuses on the properties of two pyrene-based chalcones and explores their potential applications in semiconductors and electrooptical devices.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Paper & Wood
Pradeep Nayak, Y. N. Sudhakar, Shounak De, Supriya K. Ismayil, Supriya Shetty, Vipin Cyriac
Summary: Different weight percentages of Mg(NO3)(2) were added to a polymer blend of chitosan (CS) and methylcellulose (MC) using the solution casting method. Interactions between the blend and Mg(NO3)(2) salt were observed through FTIR analysis. The polymer electrolyte films exhibited amorphous structure and their bulk resistance decreased with increasing salt content, resulting in improved electrical conductivity and stability. This eco-friendly and practical electrolyte shows great potential for electrochemical devices.
Article
Energy & Fuels
Chaithanya Purushottam Bhat, Aninamol Ani, U. Deepika Shanubhogue, P. Poornesh, Ashok Rao, Saikat Chattopadhyay
Summary: This work presents the influence of Bi doping on the structural and thermoelectric properties of Cu2Se. Cu2-xBixSe (x = 0.00, 0.004, 0.008, 0.012) samples were prepared by conventional solid-state reaction techniques. According to the XRD results at room temperature, Cu2-xBixSe samples have a monoclinic crystal structure. Doping Bi into the Cu site acts as a donor, decreasing the hole concentration except for the sample with x = 0.004. The resistivity of Cu2-xBixSe samples increases with an increase in Bi content. The Seebeck coefficient data confirm that the charge carriers in Cu2-xBixSe samples are holes. At 700 K, the Cu1.988Bi0.012Se sample exhibits the highest power factor of 1474 mu Wm(-1)K(-2), showing great potential for high-performance Cu2Se based thermoelectric materials.
Article
Engineering, Electrical & Electronic
Mohammad Saquib, Shazneen Shiraj, Ramakrishna Nayak, Aditya Nirmale, M. Selvakumar
Summary: A resistive type humidity sensor based on graphite/WO3 nanocomposite was fabricated using screen printing technique on a flexible substrate. The nanocomposite structure was analyzed using XRD, FTIR, and SEM. The humidity sensing properties of the sensors were studied by exposing them to different relative humidity levels, and the devices showed significant response and sensitivity, as well as excellent hysteresis curves and stability.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Dheeraj Devadiga, M. Selvakumar, Deepak Devadiga, Selvaraj Paramasivam, T. N. Ahipa, Prakasha Shetty, S. Senthil Kumar
Summary: Here, a metal-free organic dye (CCPICPB) with panchromatic absorption in the near-infrared range was synthesized. The dye's photophysical properties were studied and validated through experimental and theoretical simulation. Pristine and calcium-doped TiO2 microspheres were synthesized using a solvothermal approach. The performance of CCPICPB dye on these materials was evaluated, with the Ca-TiO2 photoanode-based device showing higher efficiency. Co-sensitization of CCPICPB dye with Ru(II) dye resulted in further efficiency improvement, attributed to improved V-OC and J(SC) due to the dye's compensatory effect and inhibition of electron recombination.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Anand Pal, K. Shyam Prasad, K. Gurukrishna, Suraj Mangavati, P. Poornesh, Ashok Rao, Yin-Chun Chung, Y. K. Kuo
Summary: We investigated the synthesis protocols and properties of pure and Pb-doped Cu3Sb1-xPbxSe4 (0 <= x <= 0.04) polycrystalline samples in order to achieve a high figure of merit (ZT). The samples exhibited a tetragonal structure and their electrical resistivity increased with increasing Pb content. The conduction mechanism was found to be dominated by holes, and the samples showed a narrow bandgap behavior. The estimated ZT values showed significant enhancement for the doped samples.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Ramesh Sooryanarayana Bhat, Manjunatha Krishna Balakrishna, Poornesh Parthasarathy, Ampar Chitharanjan Hegde
Summary: Single-layer and multilayer alloy deposits were electroplated onto a mild steel substrate, consisting of Zn and Fe alloys with different compositions. The corrosion resistance of these deposits was evaluated using potentiodynamic polarization method, while their surface morphology, crystal structure, and Fe content were characterized using scanning electron microscopy, X-ray diffraction, colorimetry, and energy-dispersive X-ray spectroscopy, respectively. The microhardness of the coatings was measured using a Vickers indenter. It was found that the Zn-Fe multilayer coatings showed significantly improved corrosion resistance compared to the single-layer coating, making them crucial for the automotive industry and steel-based vehicle parts.
Article
Materials Science, Multidisciplinary
Maithili K. Rao, M. Selvakumar, M. G. Mahesha, Selvaraj Paramasivam, K. Reshma Dileep, Nimitha S. Prabhu, Ganapathy Veerappan, S. Senthilkumar, Sudha D. Kamath
Summary: By introducing 1D-pyrrolidinium lead iodide (PyPbI3) into 3D-Methylammonium lead iodide (MAPbI3) perovskite, the stability issues of perovskites have been improved and solar cells have been successfully fabricated.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
A. Pramitha, Shreeganesh Subraya Hegde, Badekai Ramachandra Bhat, Sajan D. George, Y. N. Sudhakar, Y. Raviprakash
Summary: Film electrodes are made by depositing a thin layer of an electroactive material onto a conductive substrate. The performance of these electrodes is greatly influenced by the molar concentration of the initial precursor. The molar concentration significantly affects the structural, morphological, and electrochemical properties of the electrodes.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Polymer Science
G. Manikandan, Y. N. Sudhakar, M. Selvakumar, S. Pitchumani, N. G. Renganathan
Summary: The chemically synthesized copolymer of aniline and o-aminobenzoic acid was functionlized through electrochemical cationic and anionic doping to tailor its redox behavior. The mechanism of this process was proposed using cyclic voltammetry studies and confirmed through FTIR and UV studies. The electrochemical impedance spectroscopy showed the possibility of fine-tuning the conditions required for redox supercapacitor. A symmetrical supercapacitor was fabricated with an optimized doped co-polymer-based electrode and exhibited specific capacitance values of 107 Fg(-1) for n-doped polymer and 140 Fg(-1) for p-doped polymer. The electrochemical characterization of the cells demonstrated the specific power, specific energy, specific capacitance, columbic efficiency, IR drop, and ESR, providing an active region for the n/p supercapacitor. This concept opens up possibilities for tailoring dopants in the synthesis of conducting polymers and their copolymers.
Article
Physics, Multidisciplinary
P. Nayak, Y. N. Sudhakar, S. De, Ismail, S. K. Shetty
Summary: Solid biopolymer blend systems of chitosan and methylcellulose were prepared and characterized by XRD, FTIR, DSC, and TGA. The blend with 30 wt.% of MC was found to be more amorphous according to XRD analysis. FTIR analysis revealed the structural analysis and extent of interaction between CH and MC. The blend with 70 wt.% of CH showed the highest dielectric constant, and the blend with 70 wt.% CH and 30 wt.% MC exhibited good thermal stability and the lowest glass transition temperature.
INDIAN JOURNAL OF PHYSICS
(2023)
