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Understanding the energy storage mechanisms of poly(3,4-ethylenedioxythiophene)-coated silicon nanowires by electrochemical quartz crystal microbalance
摘要： The capacitive properties of electrodes elaborated from the electrochemical deposition of poly(3,4-ethylenedioxythiophene) (PEDOT) coatings onto chemical vapor deposition (CVD)-grown silicon nanowires (SiNWs) were investigated for supercapacitor applications. A high areal capacitance value of 17 mF cm-2 (50 F g-1) was obtained at a scan rate of 100 mV s-1 in a 3-electrode cell configuration. Furthermore, this 3D hybrid nanostructure was analyzed by electrochemical quartz crystal microbalance (EQCM) to correlate the interfacial ionic exchange mechanisms to their electrochemical performance. It was demonstrated that both anions (BF4-) and cations (TBA+) were simultaneously involved in the charge compensation during the oxidation-reduction scans of cyclic voltammetry measurements.
关键词： SiNWs,EQCM,PEDOT,(pseudo)-supercapacitors
更新于2025-09-23 15:23:52
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The Sonogel-Carbon-PEDOT Material: An Innovative Bulk Material for Sensor Devices
摘要： The synthesis of a new bulk material based on silicon oxide and poly-(3,4-ethylenedioxythiophene) (PEDOT), the Sonogel-Carbon-PEDOT material, is carried out. The main purpose is to obtain a bare conducting material, aided by statistical experimental design, able to be used as transducer for electrochemical devices. This new material tries also to solve out the degradation and fouling drawbacks related to PEDOT-based layer devices by simply polishing its surface in a gently way. The resulting Sonogel-Carbon-PEDOT material shows excellent electrochemical properties, renewable surface and stability by using simple, low cost, and versatile synthesis method. As far as we are concerned, this is the first time that this kind of bulk material is reported. The resulting material was characterized by different techniques: SEM, EDS and Raman spectroscopy. Sonogel-Carbon-PEDOT was also electrochemically characterized for the assessment of the electrochemical performance of the resulting sensor device. Ascorbic acid was selected as reference analyte, obtaining good sensitivity and limit of detection: 319.8 μA mM-1cm-2 and 6.42 μM, respectively, in the concentration range 0.01–3.45 mM. Furthermore, repeatability and reproducibility studies (RSD<3%), were also very satisfactory. Finally, the Sonogel-Carbon-PEDOT sensor was successfully applied to the determination of ascorbic acid in a pharmaceutical formulation and biological samples, obtaining good recovery percentage (95–105%).
关键词： electrochemical properties,sensor devices,Sonogel-Carbon-PEDOT,conducting polymers,ascorbic acid
更新于2025-09-23 15:22:29
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Anchoring Gold Nanoparticles on Poly(3,4-ethylenedioxythiophene) (PEDOT) Nanonet as Three-dimensional Electrocatalysts toward Ethanol and 2-propanol Oxidation
摘要： Renewable alcohol oxidation is of vital significance for clean energy conversion and storage. Here, we fabricated a three-dimensional (3D) nanonet-like hybrid catalyst combining Au nanoparticles and poly(3,4-ethylenedioxythiophene) (PEDOT) together, in which PEDOT nanonets act as the framework of the 3D catalyst and the support for the dispersion of Au nanoparticles. The catalyst was designated as Au-PEDOT. By using conductive carbon cloth (CC) as electrode substrates, the as-fabricated Au-PEDOT/CC electrodes were applied to evaluate the electrocatalytic activity towards ethanol and 2-propanol in the alkaline media, respectively. The catalytic activity on Au-PEDOT/CC in terms of the peak current and/or peak current density towards ethanol and 2-propanol oxidation is five times higher than that on comparative Au/CC catalysts, respectively, which is also higher than that on some similar materials reported in the literature. In addition, the Au-PEDOT/CC electrode also possessed great durability and reproducibility. This enhancement in electrocatalytic activity can be attributed to a number of factors: the nano-scale of the Au catalysts, the 3D nanostructure of the catalysts, the conductivity of PEDOT, as well as the effect of alkaline media. These results indicate the as-synthesized Au-PEDOT is a promising electrocatalyst for liquid fuel oxidation.
关键词： electro-oxidation,ethanol,Au,2-propanol,PEDOT nanonet
更新于2025-09-23 15:22:29
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Enhanced electrochromic characteristics induced by Au/PEDOT/Pt microtubes in WO3 based electrochromic devices
摘要： A study has been carried out on improving electrochromic performances of tungsten trioxide (WO3) thin films-based electrochromic devices (ECDs) with inclusion of gold/poly (3, 4-ethylenedioxythiophene)/platinum (Au/PEDOT/Pt) microtubes. The deposited film characteristics were evaluated using scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS). SEM results indicated that homogeneous spreading of Au/PEDOT/Pt microtubes are successfully obtained onto the WO3 layer. The electrochromic performances such as electrochromic contrast, response times and charge transfer resistance were investigated and compared with Au/PEDOT/Pt microtubes-free system in detail. Higher optical contrast (26%) and faster response times (bleaching time (tb): 13.83 s, coloration time (tc): 19.25 s) were obtained for electrochromic device made from Au/PEDOT/Pt microtubes against an applied potential of ± 2 V. Especially, Au/PEDOT/Pt microtubes-based ECD exhibited stronger electrochromic color change from transparent to blue.
关键词： PEDOT,Template method,Microtube,WO3,Electrochromic
更新于2025-09-23 15:22:29
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Light and pressure sensors based on PVDF with sprayed and transparent electrodes for self-powered wireless sensor nodes
摘要： In this work, we report on the fabrication of light and pressure sensors based on the piezo-and pyro material polyvinylidene fluoride (PVDF). In addition to the operation as sensors, the presented devices are characterized as energy harvesters. To form an electrical connection to the 39 μm thick PVDF foil, solution-based and transparent electrode (TE) materials such as silver nanowires (AgNWs) and poly(3,4-ethylene dioxythiophene) polystyrene sulfonate (PEDOT:PSS) are utilized and compared with commercial aluminum electrodes on polymer substrate. We show that the performance with regard to sensitivity and generated output power of the TE-PVDF devices outperforms the one for the aluminum foil devices. For the piezo- and pyroelectric effect, a pressure and light sensitivity of 3.6 mV/Pa and 42 V cm2/W, respectively, are measured. The maximum RMS power for the piezo- and pyro effect yield to 1 μW and 0.42 μW, respectively, for an active PVDF area of 8 cm2. At the end of this contribution, we show that this power suffices to drive an energy autarkic wireless sensor node (WSN) that is capable of measuring and transmitting an analog sensor signal using ultra-low power components. This application contributes substantially to the notion of the internet of things (IoT) since paramount aspects such as wireless technology, embedded electronics, and environmental sensor data together with an ultra-low power management are addressed.
关键词： wireless sensor nodes,PEDOT:PSS,WSN,Internet of Things,IoT,spray deposition,energy harvesting,silver nanowires,transparent electrodes
更新于2025-09-23 15:21:21
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[IEEE 2018 3rd International Conference On Internet of Things: Smart Innovation and Usages (IoT-SIU) - Bhimtal, India (2018.2.23-2018.2.24)] 2018 3rd International Conference On Internet of Things: Smart Innovation and Usages (IoT-SIU) - Organic Thin Film Transistor Based Graphene Drooped Sensors
摘要： Graphene film drooped on a bottom gate bottom contact (BGBC) is adopted for fabricating gas sensing technology. The sensors are competent of identifying toxic gases like CO2, NO2, CO of ultra-low surrounding air by calibrating sensitivity which is the measure of change in maximum drain current in presence of air and in absence of any toxic material on graphene layer whereas, the initial condition of graphene remaining constant except temperature. The main principle of the device is that graphene can act productively to endeavor abounding physio-chemical properties that are beneficial for gas sensing techniques which would keep a check on increasing toxic level at homes, schools, car and would prove to be beneficiary against sick building syndrome (SBS). The sensors provide an advantage of low power, low cost, good sensitivity and stability.
关键词： sensitivity,PEDOT:PSS- Poly(ethylene-dioxythiophene) /polystyrene sulphonate),Sick building syndrome (SBS),Graphene
更新于2025-09-23 15:21:21
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Stretchable Hole Extraction Layer for Improved Stability in Perovskite Solar Cells
摘要： Flexibility and stretchability of solar cells are crucial factors for enhancing their real-life application for wearable devices. Although poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been conventionally employed as a hole extraction layer (HEL) in flexible organic or perovskite solar cells, the inherent stretchability of PEDOT:PSS has yet to be convinced. Here, we report a highly stretchable and mechanically stable PEDOT:PSS-based thin film and its application on flexible perovskite solar cells. We synthesized a chemically linked copolymer, P(SS-co-TFPMA), consisting of PSS and tetrafluoropropylmethacrylate (TFPMA), followed by graft-copolymerization with poly(ethylene glycol) methyl ether methacrylate (PEGMA) to form a P(SS-co-TFPMA)-g-PEGMA dopant for the PEDOT HEL. The PEDOT:P(SS-co-TFPMA)-g-PEGMA (PEDOT:PTP) copolymer solution has excellent homogeneity and high phase stability and its developed HEL film exhibits outstanding stretching capability. After stretching of 300%, PEDOT:PTP films sustain conductivity of over 80% of its original conductivity whereas the conventional PEDOT:PSS films completely lose their conductivity after the strain of 300 %. In addition, the PEDOT:PTP incorporated flexible perovskite solar cells exhibited improved mechanical stability compared with the unassisted cells, retaining 92% of the initial power conversion efficiency after 1500 bending cycles at a 7 mm radius.
关键词： PEDOT:PTP,Stretchable,PEDOT:PSS,Hole extraction layer,Flexible,poly(ethylene glycol)methylacrylate
更新于2025-09-23 15:21:01
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Oxoammonium enabled secondary doping of hole transporting material PEDOT:PSS for high-performance organic solar cells
摘要： Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is one of the most widely used hole transporting materials in organic solar cells (OSCs). Multiple strategies have been adopted to improve the conductivity of PEDOT:PSS, however, effective strategy that can optimize the conductivity, work function, and surface energy simultaneously to reach a better energy alignment and interface contact is rare. Here, we demonstrate that oxoammonium salts (TEMPO+X?) with different counterions can act as facile and novel dopants to realize secondary doping of PEDOT:PSS. The effective charge transfer process achieved between TEMPO+X? and PEDOT:PSS results in enhanced carrier density and improved conductivity of PEDOT:PSS. Moreover, different counterions of TEMPO+X? can tune the work function and surface energy of PEDOT:PSS, enabling improved device performances. The resulting device with PM6:Y6 as the active layer shows a high power conversion efficiency (PCE) over 16%. Moreover, this doping strategy can also be applied to other conjugated polymers such as poly(3-hexylthiophene). This work provides a promising strategy to tune the properties of conjugated polymers through doping, thus effectively boosting the performance of organic solar cells.
关键词： interface modification,multi-functional secondary doping,organic solar cells,oxoammonium,PEDOT:PSS
更新于2025-09-23 15:21:01
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Conductive Holea??Selective Passivating Contacts for Crystalline Silicon Solar Cells
摘要： Defect state passivation and conductivity of materials are always in opposition; thus, it is unlikely for one material to possess both excellent carrier transport and defect state passivation simultaneously. As a result, the use of partial passivation and local contact strategies are required for silicon solar cells, which leads to fabrication processes with technical complexities. Thus, one material that possesses both a good passivation and conductivity is highly desirable in silicon photovoltaic (PV) cells. In this work, a passivation-conductivity phase-like diagram is presented and a conductive-passivating-carrier-selective contact is achieved using PEDOT:Nafion composite thin films. A power conversion efficiency of 18.8% is reported for an industrial multicrystalline silicon solar cell with a back PEDOT:Nafion contact, demonstrating a solution-processed organic passivating contact concept. This concept has the potential advantages of omitting the use of conventional dielectric passivation materials deposited by costly high-vacuum equipment, energy-intensive high-temperature processes, and complex laser opening steps. This work also contributes an effective back-surface field scheme and a new hole-selective contact for p-type and n-type silicon solar cells, respectively, both for research purposes and as a low-cost surface engineering strategy for future Si-based PV technologies.
关键词： solar cells,PEDOT,Nafion,passivation,conductivity
更新于2025-09-23 15:21:01
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Enhanced stability and efficiency in inverted perovskite solar cells through graphene doping of PEDOT:PSS hole transport layer
摘要： Poly(3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) plays a relevant role in the device performance as hole extraction layer (HTL) of inverted perovskite solar cells. Here, we show a simple low-temperature spin coating method for obtaining homogenous graphene-doped thin films of PEDOT:PSS with improved electrical conductivity without decreasing optical transmittance. Moreover, the crystallinity and stability in ambient conditions of the perovskite grown on it are enhanced. The hydrophobic character of graphene probably blocks undesirable reactions hampering degradation. By impedance spectroscopy it is demonstrated better charge extraction and reduction of recombination mechanisms at the doped-HTL/perovskite interface, resulting in improved photovoltaic parameters of the solar cell and greater stability at room operation conditions thus providing a simple and cost-effective method of preparing solar cells based on hybrid perovskites.
关键词： perovskite solar cell,PEDOT:PSS,doping,graphene,hole transport layer,impedance spectroscopy
更新于2025-09-23 15:21:01