Article
Electrochemistry
Jesica Ortiz, Dwight Acosta, Carlos Magana
Summary: WO3 thin films with improved electrochromic durability were deposited using pneumatic spray pyrolysis technique. The films showed switching stability of more than 15,000 cycles and exceptional diffusion of H+ ions. The morphological, topological, and spectroscopic properties of the films were consistent with previous studies.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Andrey Yasinskiy, Sai Krishna Padamata, Srecko Stopic, Dominic Feldhaus, Dmitriy Varyukhin, Bernd Friedrich, Peter Polyakov
Summary: The study investigated the electrochemical decomposition of spent catalyst in molten salts for the extraction of precious metals, focusing on aluminum electrowinning from xLiF-(1-x)AlF3 melts. The results revealed a diffusion-controlled two-step process with both one-electron and two-electron reductions occurring simultaneously at close potentials. Further research is needed to optimize the process parameters for aluminum reduction during catalyst treatment and primary metal production.
Article
Energy & Fuels
Gaurav Tatrari, Chetna Tewari, Mayank Pathak, Diksha Bhatt, Manoj Karakoti, Sandeep Pandey, Deewan Singh Uniyal, Faiz Ullah Shah, Nanda Gopal Sahoo
Summary: Researchers developed a method to prepare 3D graphene hydrogel (3DGH) and its bimetal composite (3DGHMC) with tungsten trioxide (WO3) and manganese dioxide (MnO2). The structure of 3DGH and its composite was confirmed by advanced characterization techniques, and the performance of two symmetric devices and one asymmetric device was analyzed by various electrochemical tests. The asymmetric device showed high capacitance, energy density, and power density, and demonstrated good stability during charging-discharging cycles.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Multidisciplinary
Marika Gugole, Oliver Olsson, Stefano Rossi, Magnus P. Jonsson, Andreas Dahlin
Summary: The possibility of actively controlling structural colors has attracted a lot of attention recently, especially for new types of reflective displays. By using inorganic electrochromic nanostructures based on tungsten trioxide, gold, and platinum, a wide color range and high reflectance can be achieved, outperforming the latest commercial color e-readers.
Article
Engineering, Chemical
Sepideh Niazi, Espen Olsen, Heidi S. Nygard
Summary: This study investigated the use of electrodeposition to remove impurities from molten salt. The results showed that Cu and Fe(III) can be completely removed in a relatively short time, but the removal of Fe(II) and Mn was less effective with some impurities remaining.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Qingyi Huang, Yi Liang, Sheng Cao, Zaishang Yang
Summary: Vertically aligned WO3 nano-architectures can be obtained by adjusting the composition of the precursor solution via a hydrothermal method. The nanostructured array films with thicknesses of about 600 nm exhibit remarkable enhancement of electrochromic properties in the infrared region. The improved performance is attributed to the vertically arranged structure, facilitating ion diffusion and providing a larger surface area for charge transfer reaction.
Article
Chemistry, Multidisciplinary
Yaowu Li, Peiyan Sun, Jian Chen, Xiuling Zha, Xueqing Tang, Zhiwei Chen, Yanan Zhang, Shan Cong, Fengxia Geng, Zhigang Zhao
Summary: The use of a new device design based on porous metamaterials has solved the limitations of metamaterial-based electrochromic displays. The new device achieves good color quality, non-iridescence, fast switching response, excellent cycling performance, and low power consumption.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Lisa Braendler, Lukas Niklaus, Marco Schott, Peer Loebmann
Summary: UV irradiation is used to precharge sputtered tungsten trioxide (WO3) on polyethylene terephthalate, enhancing the photochromic response with organic solvents. The correlation between transmittance and charge density allows for precise control of the precharging process monitored by UV-Vis spectroscopy. A proof-of-concept flexible electrochromic device combining precharged WO3 and Prussian blue exhibits a superior change in visible light transmittance and high coloration efficiency.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Electrochemistry
Dimitrios Louloudakis, Kyriakos Mouratis, Jorge Gil-Rostra, Emmanouel Koudoumas, Rafael Alvarez, Alberto Palmero, Agustin R. Gonzalez-Elipe
Summary: In this study, the electrochromic response of porous WO3 thin films grown at different pressures was compared, revealing that higher porosity films exhibited poorer performance, which can be explained by the characteristics of the porous structure. The accessible pore volume and area play key roles in determining the efficiency and reversibility of the electrochromic response.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Analytical
Vincent Ball
Summary: This study compares the influence of different electrodeposition methods on the electrochemical properties of films made from pyrogallol or pyrocatechol on amorphous carbon electrodes. It was found that chronoamperometry is more efficient for pyrocatechol-based films, while fewer cyclic voltammetry cycles are needed for pyrogallol-based films to become impermeable to hexacyanoferrate anions.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Biwu Cai, Jianbang Ge, Fei Zhu, Yang Gao, Shuqiang Jiao
Summary: This study investigates natural convection effects in low-concentration redox solutions using cyclic voltammetry and chronoamperometry. The coexistence of convection-diffusion layer and density-driven convection is observed, and zone diagrams are established to reveal the effects of various factors on natural convection.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mohamed Abd-Elsabour, Mortaga M. Abou-Krisha, Sayed H. Kenawy, Tarek A. Yousef
Summary: A simple and eco-friendly electrochemical sensor based on a chitosan nanocomposite carbon paste electrode was developed for the detection of the anti-inflammatory diclofenac (DIC). The sensor showed high electrocatalytic activity towards DIC in a BR buffer solution. The peak current was linearly proportional to DIC concentration and the sensor exhibited reliable and sensitive detection of DIC in biological and pharmaceutical samples.
Article
Electrochemistry
Nathan D. Smith, Stephen Lombardo, Shun-Li Shang, Zi-Kui Liu, Hojong Kim
Summary: The kinetic properties of Ni(II) in FLiNaK molten salt were investigated using various electrochemical techniques. The reduction of Ni(II) to Ni(s) was found to be a single step, two-electron transfer process. Diffusivity values were calculated using different equations and methodologies, with a range of 3.27 x 10(-7)-3.04 x 10(-6) cm(2) s(-1) and an activation energy of 62-104 kJ mol(-1). The variations in the estimated kinetic properties may be attributed to the assumptions made in the theoretical models regarding reversibility and unit activity during Ni metal deposition.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Energy & Fuels
I Tou, Y. Azri, M. Sadi, D. Zitouni, A. S. Merad, A. Laichouchi, N. Drouiche, H. Lounici, S. Gana-Kebbouche
Summary: The electroactivity of Chlorophytum rhizospheric soil was demonstrated using imposed potential chronoamperometry and cyclic voltammetry, showing different current densities at various electrode polarizations. The potential + 0.155 V/SCE appeared to stimulate electrogenic bacteria activity, leading to the formation of electroactive biofilms by different bacterial strains in the rhizosphere. The soil composition of Chlorophytum rhizosphere, particularly the presence of Firmicutes and Proteobacteria, influenced the electroactivity and development of electroactive biofilms.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Chemistry, Physical
Ahmar Mehmood, Azhar Ali Haidry, Xueyuan Long, Xiaogang Zhang
Summary: This research evaluated tungsten and vanadium oxide co-sputtered thin films under different applied cyclic voltages, revealing the appearance of new peaks and severely damaged morphologies after -1.3 V cycles. The current density reduction was significant for both bleaching and coloring, with the switching times of WO3-V2O5 thin films drastically reduced compared to WO3 films.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Love Bansal, Chanchal Rani, Tanushree Ghosh, Suchita Kandpal, Manushree Tanwar, Rajesh Kumar
Summary: In this study, fractal porous silicon (pSi) electrodes fabricated using metal-assisted chemical etching (MACE) technique were investigated for charge storage applications. The electrochemical performance of the pSi electrodes was studied and compared with c-Si electrodes. The results showed that the pSi electrodes exhibited more capacitive current flow, while the c-Si electrodes showed ohmic behavior. The calculated areal capacitance values at different scan rates were also moderate, suggesting that pSi could be a potential candidate for energy/charge storage electrodes.
Article
Physics, Applied
Arpit Kumar Singh, Sooraj Shiby, Anshu Sahu, Piyush Pachori, Manushree Tanwar, Rajesh Kumar, I. A. Palani
Summary: Graphene is highly sought after in device fabrication for its high conductivity and flexural strength. Laser patterning of polyimide for graphene synthesis has gained attention for its ability to create flexible devices. This study focused on optimizing laser pulse overlap to enhance the crystallinity and electrical resistivity of synthesized graphene.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Suchita Kandpal, Ilya Ezhov, Manushree Tanwar, Denis Nazarov, Denis Olkhovskii, Leonid Filatov, Maxim Yu. Maximov, Rajesh Kumar
Summary: In order to design solid state hybrid or all-inorganic electrochromic devices, alternative methods for depositing electrochromic metal oxide thin films need to be explored. The electrochromic performance of a hybrid device using plasma assisted atomic layer deposition (ALD) grown nickel oxide (NiO) thin film and viologen was studied. The films of NiO with a thickness of a few tens of nanometers were first deposited on silicon, and then on Fluorine-doped Tin Oxide (FTO)/glass substrates to fabricate the device. The as-prepared films were analyzed for their structural and morphological properties, and a solid state organic-inorganic hybrid electrochromic device was fabricated. The device demonstrated impressive electrochromic behavior with high coloration efficiency, contrast ratio, and cycle life/stability. The ALD grown films showed advantage over other methods in terms of the smoothness and crack-free nature, allowing for proper power utilization in color switching. These results provide a new way to fabricate high-performance hybrid solid state electrochromic devices.
Article
Chemistry, Physical
Chanchal Rani, Suchita Kandpal, Tanushree Ghosh, Love Bansal, Manushree Tanwar, Rajesh Kumar
Summary: By performing temperature- and wavelength-dependent Raman Spectromicroscopy on heavily-doped Si, an unusual anti-anharmonic effect was discovered and its potential interrelation with the energy-dispersive behavior of Fano coupling strength was explored. A method to calculate the Fano-interferon dissociation energy was developed by understanding the manifestation of the interplay in terms of the Raman line shape, and a wavelength-dependent empirical relation was proposed to calculate the required thermal energy to dissociate the electron-phonon bound state.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Sayantan Sarkar, Tanushree Ghosh, Argha Chakrobarty, Jagannath Majhi, Probal Nag, Anasuya Bandyopadhyay, Sivaranjana Reddy Vennapusa, Rajesh Kumar, Suman Mukhopadhyay
Summary: Here, a redox-active multifunctional ionic porous organic polymer iPOP-Bpy with exchangeable Br- ions, incorporating viologen as a redox-active building block, is designed and synthesized. The material exhibits excellent iodine uptake capacity in vapor phase (540 wt %) as well as in organic (1009.77 mg g(-1)) and aqueous phases (3921.47 mg g(-1)) with very fast adsorption kinetics. It also functions as a solid-state NH3 vapor sensor, showing rapid color switching in the presence of NH3 vapor. Moreover, it is used as a p-type complementary electrochromic electrode and shows promising performance for fabricating power-efficient solid-state electrochromic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Materials Science, Multidisciplinary
Tanushree Ghosh, Suchita Kandpal, Chanchal Rani, Anjali Chaudhary, Rajesh Kumar
Summary: Electrochromism has been widely applied in smart devices such as smart windows, self-powered batteries, and solar panels. Solid-state integration of electrochromic materials is crucial for these applications. This article provides a comprehensive discussion on various materials acting as chromophores under electric bias and the parameters influencing device performance. The design of the device, including conducting substrates, electrochromic active materials, and electrolytes, is also discussed, along with different device paradigms and application-oriented structural modifications. The challenges and future directions are addressed as well.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ranjeev Kumar Parashar, Suchita Kandpal, Prasanta Bandyopadhyay, Mainak Sadhukhan, Rajesh Kumar, Prakash Chandra Mondal
Summary: The demand for low-cost electrochromic materials has surged in recent years due to their applications in visible-region multicolor display technology, flexible and wearable electronic devices, smart windows, and optoelectronic applications. In this study, the authors successfully fabricated large-scale polyelectrochromic devices using a novel anthracene containing viologen, AnV(2+), and polythiophene (P3HT). These devices exhibited reversible color changes, fast switching time, high coloration efficiency, and long cycling stability. The integration of anthracene moieties in the viologen prevented the undesired formation of cation radical dimers, which would have hindered color switching when the bias polarity is reversed. This work demonstrates the compatibility with CMOS technology and opens up possibilities for the development of cost-effective flexible and wearable electrochromic devices.
ADVANCED OPTICAL MATERIALS
(2023)
Review
Chemistry, Physical
Suchita Kandpal, Tanushree Ghosh, Chanchal Rani, Anjali Chaudhary, Jinwoo Park, Pooi See Lee, Rajesh Kumar
Summary: Significant development in science and technology has occurred to meet the rising energy demands, particularly in response to environmental concerns associated with fossil fuels. Electrochromic devices, which combine energy conversion with color modulation, hold great promise for energy storage and saving purposes in buildings and vehicles, and can operate similarly to batteries and supercapacitors.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Bhumika Sahu, Tanushree Ghosh, Suchita Kandpal, Love Bansal, Chanchal Rani, Hem Chandra Jha, Rajesh Kumar
Summary: Herbal electronics is an emerging field that focuses on the optical and electrical properties of herbal materials for potential electronic applications. This study investigates the optical properties of turmeric and henna extract solutions through absorption and luminescence spectroscopies. The analysis reveals that when the two solutions are mixed and excited by a blue/UV LED, they emit yellow light. The emission color is quantitatively evaluated using CIE color chart and the PL quantum yield is calculated. A simple setup demonstrates the yellow emission using a blue LED (400 nm) and the mixture solution, achieving a quantum yield of approximately 5%.
Article
Nanoscience & Nanotechnology
Ranjeev Kumar Parashar, Suchita Kandpal, Nila Pal, Debashree Manna, Bhola Nath Pal, Rajesh Kumar, Prakash Chandra Mondal
Summary: This study reports the coexistence of bistate electrochromic and single-resistor memory functions in a novel viologen. A high-performance electrochromic function is achieved by combining viologen with polythiophene. The random-access memory devices exhibit distinct low and high resistive states, bipolar and nonvolatile characteristics, and have good performances and Write-Read-Erase functions. This discovery could boost the development of multifunctional, smart, wearable, flexible, and low-cost optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biochemistry & Molecular Biology
Chinmaya Kumar Patel, Chanchal Rani, Rajesh Kumar, Tushar Kanti Mukherjee
Summary: Protein aggregation and inactivation during surface immobilization hinder analytical applications in biotechnology. However, biomolecular condensates of active human serum transferrin (Tf) can prevent surface-induced fibrillation and maintain the native conformation of phase-separated Tf for a month. The condensates promote homotypic liquid-liquid phase separation (LLPS) through hydrophobic interactions, without undergoing a solid-like phase transition. These liquid-like condensates also inhibit surface-induced fibrillation, protecting the biomolecules from denaturation and aggregation. This study sheds light on the functional aspect of protein condensates and their potential applications in cell physiology and biotechnology.
Article
Chemistry, Multidisciplinary
Deepali Aswal, Priyanka Bamola, Chanchal Rani, Saurabh Rawat, Abhinav Bhatt, Sandeep Chhoker, Mohit Sharma, Charu Dwivedi, Rajesh Kumar, Himani Sharma
Summary: This study focuses on the enrichment of photocatalytic activity by different WS2-based heterostructures, and investigates the impact of interfacial interaction. The results show that the 2D-2D MoS2/WS2 heterostructure exhibits the highest catalytic activity, which is attributed to its higher conductivity and better charge separation.
Article
Materials Science, Multidisciplinary
Leonid Filatov, Pavel Vishniakov, Ilya Ezhov, Ivan Gorbov, Denis Nazarov, Denis Olkhovskii, Rajesh Kumar, Shengjie Peng, Gang He, Vladislav Chernyavsky, Marina Gushchina, Maxim Maximov
Summary: This article investigates the impact of atomic layer deposition method on the growth of carbon nanotubes, and found that the initial NiO layer thickness plays a significant role in achieving intensive growth of carbon nanotubes.
Article
Materials Science, Multidisciplinary
Love Bansal, Tanushree Ghosh, Suchita Kandpal, Chanchal Rani, Bhumika Sahu, Deb Kumar Rath, Christoph Wesemann, Sandeep Chhoker, Nadja C. Bigall, Rajesh Kumar
Summary: This study investigates the suitability of microcrystalline MoO3 powder for energy storage devices and HF sensing. The results show that the specific capacitance of MoO3 increases linearly with the concentration of HF, and MoO3 exhibits good stability and repeatability. In situ Raman spectroscopy is used to understand the charge storage mechanism. The material demonstrates high sensitivity and a low limit of detection, making it suitable for sensing and charge storage applications.
MATERIALS ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Suchita Kandpal, Love Bansal, Anjali Ghanghass, Tanushree Ghosh, Chanchal Rani, Bhumika Sahu, Deb Kumar Rath, Ravi Bhatia, I. Sameera, Rajesh Kumar
Summary: A new methodology for enhancing electrochromic performance and adding energy storage capabilities to create a multifunctional solid-state device has been demonstrated. The fabricated device shows improved electrochromic performance in terms of switching time, color contrast, efficiency, and stability in both visible and near-infrared (NIR) regions.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
