7 research outputs found
Semitransparent Perovskite Solar Cells for Building Integrated Photovoltaics: Recent Advances
Get PDFPerovskite solar cells technology is one of the most advanced and fascinating technologies in the field of photovoltaics due to its low-cost processing and delivering efficient power conversion efficiencies. The ability to become transparent is another prolific property of the perovskite solar cells, which this property has been tried to be exploited in recent times by researchers to serve the environmental and energy needs of human beings. Using this transparency and enabling semitransparent perovskite solar cells (ST-PSCs) to be placed on the windows and rooftops of buildings will reduce room temperature along with fulfilling certain requirements of power needs. This review pays attention to the recent developments in the semitransparent perovskite solar cells from the perspective of the structure of ST PSCs, electrodes and others
Smart-Textile-Based Electrochemical Capacitive Ionic Sensors for High-Performance Epidermal Electronics
Get PDFRecently, biomedical engineering has placed greater importance on wearable and disposable health-care monitoring devices. Various degradable biosensors have been developed to measure human parameters, such as temperature, pH, pressure, strain, and ion concentration, utilizing bodily fluids, such as sweat, for analysis. In this letter, we developed a new textile-based electrochemical capacitive sensor (TECS) employing multiwalled carbon nanotube-coated cellulose cloth. The electrodes for the TECS were fabricated using a drop coating method, and their surface morphology was evaluated by scanning electron microscopic images. Cyclic voltammetry analysis of the TECS revealed that the fabricated sensor exhibited a sensitivity of 0.29 µA/log [Na + ] in the concentration range of 0–16 mM NaCl. The device operates on an electrochemical capacitive mechanism, exhibiting a specific capacitance variation of 6.9 µF⋅cm −2 across the NaCl concentration range of 0–16 mM. The electrochemical impedance spectroscopic analysis in the frequency range of 10 mHz to 1 MHz indicates the impact of ionic concentration variation, particularly in the low-frequency range. The fabricated TECS offers high sensing performance, biodegradability, and disposability, attributed to its development on cellulose cloth. The developed sensor has potential application in epidermal electronics through integration with smart textiles and offers significant opportunities in wearable biomedical devices
Biodegradable biopolymers for electrochemical energy storage devices in a circular economy
Get PDFThe rising trend of green energy has made it necessary to utilise efficient green materials in electrochemical energy storage devices (EESDs) under a green economy. The need for sustainable energy storage technologies due to the rising demand for energy, improved technology, and the huge challenge of E-waste requires the development of eco-friendly advanced materials and recycling processes in electrochemical energy storage within a circular economy framework. This paper focuses on cellulose, shellac, polylactic acid (PLA), chitin, and chitosan due to their exceptional sustainability, biodegradability, and functional properties and explore how these polymers can improve the circular economy for batteries and supercapacitors by following the aspects of their background, processing and preparation methods, properties, chemical structures, applications, and recent development. As such, this review promotes the increased utilisation of biodegradable biopolymers within the circular economy of EESDs, particularly for future technologies such as flexible, wearable, stretchable, and transparent devices. This review raises awareness of these materials' capability to improve sustainability and recyclability, thus promoting increased use and integration of these materials into EESDs leading to green technologies and low environmental impact
Opto-electrochemical variation with gel polymer electrolytes in transparent electrochemical capacitors for ionotronics
No full textAdvanced flexible ionotronic devices have found excellent applications in the next generation of electronic skin (e-skin) development for smart wearables, robotics, and prosthesis. In this work, we developed transparent ionotronic-based flexible electrochemical capacitors using gel electrolytes and indium tin oxide (ITO) based transparent flexible electrodes. Different gel electrolytes were prepared using various salts, including NaCl, KCl, and LiCl in a 1:1 ratio with a polyvinyl alcohol (PVA) solution and compared its electrochemical performances. The interaction between gel electrolytes and ITO electrodes was investigated through the development of transparent electrochemical capacitors (TEC). The stable and consistent supply of ions was provided by the gel, which is essential for the charge storage and discharge within the TEC. The total charge contribution of the developed TECs is found from the diffusion-controlled mechanism and is measured to be 4.59 mC cm−2 for a LiCl/PVA-based gel. The prepared TEC with LiCl/PVA gel electrolyte exhibited a specific capacitance of 6.61 mF cm−2 at 10 μA cm−2. The prepared electrolyte shows a transparency of 99% at 550 nm and the fabricated TEC using LiCl/PVA gel exhibited a direct bandgap of 5.34 eV. The primary benefits of such ionotronic-based TEC development point to its potential future applications in the manufacturing of transparent batteries, electrochromic energy storage devices, ionotronic-based sensors, and photoelectrochemical energy storage devices
2D metal-organic framework Cu<sub>3</sub>(HHTP)<sub>2</sub> composite electrode for flexible energy storage applications
Get PDFHydrothermally synthesized 2D metal-organic framework (MOF) Cu3(HHTP)2 was modified with carbon black (CB) and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS) to develop a flexible energy storage device. The efficiency of electron transfer and ionic diffusion within the pristine MOF was enhanced in the composites of MOFs. The MOF/CB/PEDOT: PSS (20 %) composite demonstrated more than 110 times higher capacitance compared with pristine MOF-based devices, reaching 336.93 mF cm−2 (146.51 F g−1) at 0.1 mA cm−2. The developed device exhibited energy and power densities of 29.31 μW h cm−2 (12.86 Wh.kg−1) and 39.38 μW cm−2 (17.28 W kg−1), respectively. The addition of CB and PEDOT: PSS into the Cu3(HHTP)2 MOF decreased the pore structure due to the incorporation of solid materials in the pores and an excellent conductive channel for ion transfer. The study reveals that modifying the electrical, mechanical, and electrochemical properties of a 2D MOF can lead to the design of a high-performance flexible energy storage device for portable and wearable electronics.</p
