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- 2018
- Battery energy storage systems
- techno-economic modeling
- photovoltaics
- net-metering
- solar power
- Electrical Engineering and Automation
- Aristotle University of Thessaloniki
- Western Macedonia University of Applied Sciences
- Technological Educational Institute of Thessaly
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Vertically-grown few-layer MoS2 nanosheets on hierarchical carbon nanocages for pseudocapacitive lithium storage with ultrahigh-rate capability and long-term recyclability
摘要： Molybdenum disulfide (MoS2) are intensively studied anode materials for lithium-ion batteries (LIBs) owing to the high theoretical capacity, but still confront the severe challenges of unsatisfied rate capability and cycle life to date. Herein, few-layer MoS2 nanosheets are vertically grown on the hierarchical carbon nanocages (hCNC) via a facile hydrothermal method, which introduce pseudocapacitive lithium storage owing to the highly-exposed MoS2 basal planes, enhanced conductivity and facilitated electrolyte access arising from the well hybridization with hCNC. As a result, the optimized MoS2/hCNC exhibits the reversible capacity of 1670 mAh g-1 at 0.1 A g-1 after 50 cycles, 621 mAh g-1 at 5.0 A g-1 after 500 cycles, and 196 mAh g-1 at 50 A g-1 after 2,500 cycles, staying at the top level of the MoS2-based anode materials. The specific power and specific energy can reach to 16.1 kW kg-1 electrode and 252.8 Wh kg-1 electrode after 3,000 cycles, respectively, showing the great potential in high-power and long-life LIBs. This finding suggests a promising strategy for exploring advanced anode materials with high reversible capacity, high-rate capability and long-term recyclability.
关键词： pseudocapacitive lithium storage,vertical few-layer MoS2,hierarchical carbon nanocages,long-term recyclability,ultrahigh-rate capability
更新于2025-09-23 15:23:52
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Unique oblate-like ZnWO4 nanostructures for electrochemical energy storage performances
摘要： Unique ZnWO4 oblate nanospheres (ZWO-ONSs) deposited on Nickel foam (Ni foam) are successfully prepared via facile hydrothermal route. The ZWO-ONSs show high specific surface area of 89.47 m2g-1. The as-prepared nanostructures tested in 3 M KOH aqueous solution, perform excellent electrochemical performances showing specific capacity of 1198 Fg-1 at 1 Ag-1, and high retention rate cyclic stability 96.56% after 1000 cycles at 10 Ag-1. Distinctive binary metal oxide nanoarchitectures are dynamic material for energy storage systems.
关键词： Supercapacitors,ZnWO4,Oblate-like nanostructures,Structural,Energy storage and conversion
更新于2025-09-23 15:23:52
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PV-pumped energy storage option for convalescing performance of hydroelectric station under declining precipitation trend
摘要： The precipitation trend is critically important for functioning of hydroelectric power stations and development of irrigation sector. Studies indicate that freshwater availability in many river basins in India is likely to decrease due to climate change. Despite having promising hydro potential in north-eastern (N-E) region of India, decline in rainfall in the region causes paucity of water in various hydro power plants' reservoirs. Many units of hydroelectric projects are being kept off and as a result, generation comes down to a large extent. As a partial solution to the problem, many such small hydroelectric projects' may be revived by integrating solar photovoltaic (PV) powered pumped storage unit as there is synergy of solar energy with irrigation water pumping and hydro power station. The present study aims to looking at reliable, continuous and cost-competitive power supply option. The study has been conceived with the lone hydroelectric power station of Tripura (one of the N-E states of India) which practically remains inoperative as water is hardly available at the end of the year and before next monsoon. Results substantiate that PV powered pumped storage is a viable option for restoring the steady annual performance of the hydroelectric plant.
关键词： PV power generation,Pumped storage,Generation mix,Hydro power generation,Climate change
更新于2025-09-23 15:23:52
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Investigating the Role of Glass and Quartz Substrates on the Formation of Interfacial Droplets
摘要： Nanostructuring has been proved effective towards improving many energy storage and conversion devices, and is feasible for a wide range of materials. In particular, secondary nanoarchitectured materials exhibit collective advantages compared with nano-sized primary building blocks. Despite the manifold efforts in designed nanoarchitectures and synthetic routes, the underlying ion diffusion kinetics and phase transformation behaviors within nanoarchitectures still remain less explored. Herein, we probed enhanced lithium-ion transport behaviors using 2D holey zinc ferrite (ZFO) nanosheets as a model material, to demonstrate how self-assembled 2D holey nanoarchitectured electrodes can feature efficient ion diffusion channels, robust yet continuous electron transfer framework, and enlarged surface area, contributing to the superior performance over the ZFO nanoparticles without secondary structures. By revealing kinetic parameters through combined spectroscopic measurements and electrochemical techniques, our study manifests increased lithium-ion diffusion coefficients, higher capacitive charge storage contribution and reduced charge transfer impedance in holey nanosheets compared to randomly aggregated nanoparticles. Our results promote deeper understanding of significantly enhanced electrochemical energy storage properties of these 2D holey nanoarchitectured electrodes resulted from more uniform and complete phase transformation and better active material utilization.
关键词： nanostructuring,2D holey nanosheets,energy storage,transport kinetics,Li-ion battery
更新于2025-09-23 15:23:52
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Rephasing efficiency of sequences of phased pulses in spin-echo and light-storage experiments
摘要： We investigate the rephasing efficiency of sequences of phased pulses for spin echoes and light storage by electromagnetically induced transparency (EIT). We derive a simple theoretical model and show that the rephasing efficiency is very sensitive to the phases of the imperfect rephasing pulses. The obtained efficiency differs substantially for spin echoes and EIT light storage, which is due to the spatially retarded coherence phases after EIT light storage. Similar behavior is also expected for other light-storage protocols with spatial retardation or for rephasing of collective quantum states with an unknown or undefined phase, e.g., as relevant in single-photon storage. We confirm the predictions of our theoretical model by experiments in a Pr3+:Y2SiO5 crystal.
关键词： phased pulses,rephasing efficiency,electromagnetically induced transparency,light storage,EIT,spin echoes,Pr3+:Y2SiO5 crystal
更新于2025-09-23 15:23:52
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Additional Stability Testing of Cryopreserved Intestinal Biopsies for Downstream Flow Cytometric Analysis
摘要： The use of flow cytometry (FC) in therapeutic clinical trials involving patients with gastrointestinal (GI) diseases may accelerate drug development by providing insights into pharmacokinetic/pharmacodynamic relationships and target engagement, as well as by identifying responder populations. The application of FC in these trials, however, has been constrained by the practical limitations of storing and shipping intestinal biopsy samples prior to cell extraction and FC analysis, and the potential impact of handling and storage conditions on viable cell yield. Furthermore, there has been a lack of standardization for these processes. We have undertaken research to attempt to address these constraints to the inclusion of translational science in multi-center clinical trials. Our previous work, Wildenberg et al. (2018, 459:50-54), published in this journal, demonstrated that it was feasible to store intestinal biopsies from patients with Crohn's disease under conditions that allow for subsequent processing with preservation of adequate numbers of viable cells for valid FC analyses. This study demonstrated that storage of intestinal tissue biopsies at ?20 °C in DMSO/citrate buffer for up to 48 h resulted in sufficient viable cell yield for FC analysis without affecting subsequent marker-positive cell proportions. Although these preliminary findings provide support for the shipping and storage of intestinal biopsies for centralized FC analysis in multicenter clinical trials, some practical limitations remain. For example, in the clinical trial setting, where patient enrolment and study procedures occur in an ongoing fashion and frequently over an extended period of time, it is impracticable from a resource perspective for a central laboratory to process study samples as they are collected from individual patients. Furthermore, contemporary clinical trials in the inflammatory bowel diseases are most often conducted on a global scale. Shipping and processing of biopsy samples by a central laboratory within a 48 h timeframe in this context would compound costs and add logistical hurdles that might discourage industry support for the inclusion of translational science in the multi-center clinical trial setting. In this regard, longer-term storage, and batch processing of study biopsy samples would be a preferred method. This approach would reduce both the variability and costs associated with more frequent assays and expansive resource utilization. To that end, we developed an addendum to our original study protocol to examine the effect of longer-term storage condition prior to cell isolation and FC on viable cell yield and the proportions of immune cell phenotypes from intestinal biopsies. Consistent with the original protocol, the study was performed at Tytgat Institute (Academic Medical Center, Amsterdam, the Netherlands) under the original ethics approval, and with informed consent. Biopsies (N = 180) were procured from surgically resected inflamed or non-inflamed ileal and/or colonic tissue from four patients undergoing Crohn's disease-related surgeries (colectomy [n = 2], subtotal colectomy, ileo-cecal resection). Two biopsies were pooled and processed as a single sample, resulting in 90 samples per surgical specimen and 18 samples per condition tested. The effects of 5 different storage conditions on cell viability and subsequent FC analyses were compared in this study addendum; immediate (< 1 h from sample receipt) processing, storage at ?20 °C and ?80 °C for 24 h with subsequent overnight storage on dry ice (to mimic real life shipping conditions) followed by long-term (2–3 months) storage at ?20 °C and ? 80 °C, and immediate long-term storage at ?20 °C and ? 80 °C. Subsequent methods for cell isolation, staining, and FACS analysis were as previously described (Wildenberg et al. 2018, 459:50–54). Analysis of freshly processed biopsy samples resulted in a mean (standard deviation, SD) yield of 36916.7 (59194.7) live immune cells as identified by CD45+ staining. Storage of biopsies for greater than or equal to two months at either ?20° or ? 80 °C significantly reduced the mean [standard deviation] number of live CD45+ cells compared to immediate processing (372.0 [607.1] and 4065.3 [4489.7], respectively, p < 0.001 for both comparisons with immediate processing). Sufficient cell yield (≥ 300 live CD45+ cells) for subsequent FC analysis was obtained from 77.8% (14/18) of samples processed immediately compared to 22.2% (4/18) and 27.8% (5/18) of samples stored at ?20 °C (with and without simulated shipment; p < 0.001 chi square test) and 77.8% (14/18) and 94.4% (17/18) of samples stored at ?80 °C (with and without simulated shipping; p = 0.439). We further evaluated the effect of storage on the composition of specific cell types in the samples and observed a significant decrease in the proportion of CD3+ and CD4+ cells after storage at ?20 °C compared to samples that were immediately processed (Table 1 and Fig. 1, panels A and B). The proportion of CD8+ and CD14+ cells was unaffected by storage temperature, although the standard deviations for the proportions of these cells in samples stored at ?20 °C were larger than for those observed for samples stored at ?80 °C (Table 1 and Fig. 1, panels C and D). In conclusion, our previous work demonstrated that it is feasible to store mucosal biopsies at ?20 °C for 48 h in DMSO/citrate buffer before further processing with preservation of adequate numbers of viable cells for valid FC analyses suggesting that centralized FC is possible. These data provided a basis for performing additional stability testing (including shipping and longer storage). Results from this protocol addendum suggest that lower temperatures (?80 °C) may be required for longer-term storage of mucosal biopsies, and that long-term storage at ?20 °C may both reduce viable cell yield, and alter the proportion of certain immune cells detected on subsequent FC analysis. We cannot, however, exclude the possibility that our results were confounded by selection bias and/or that the effects that we observed on cell proportion were the result of significantly fewer samples with ≥300 live CD45+ cells for analysis after storage at ?20 °C (albeit a result of decreased viability). Overnight storage of biopsies on dry ice to mimic real life shipping conditions to a central laboratory did not appear to affect live cell yield or immune cell proportions for the markers studied (CD3+, CD4+, CD8+, CD14+).
关键词： Biopsy,Long-term storage,Viability,Inflammatory bowel disease,Fluorescence activated cell sorting
更新于2025-09-23 15:23:52
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The evolution of phase structure, dielectric, strain, and energy storage density of complex-ions (Sr1/3Nb2/3)4+ doped 0.82Bi0.5Na0.5TiO3-0.18Bi0.5K0.5TiO3 ceramics
摘要： Lead-free Bi0.5(Na0.82K0.18)0.5Ti1-x(Sr1/3Nb2/3)xO3 (abbreviated as BNKT-xSN, x = 0.02–0.045) ceramics were fabricated via the conventional ceramic process, and the (Sr1/3Nb2/3)4+ complex-ions were used to modify the phase transition and multifarious electrical responses of BNKT-xSN ceramics. The SN complex-ions absolutely incorporate into the lattice of BNKT matrix to form perovskite structure. The grain morphologies and size are almost unaffected by SN complex-ions. The phase transition concerning ferroelectric type transforming into ergodic relaxor happens with increasing SN content, and the corresponding critical point is x = 0.035. The phase transformation process results in the improvement of energy storage density (W = 0.754 J/cm3) at 80 kV/cm and a high bipolar strain (S = 0.25%) with small hysteresis. The dielectric constant at Tm peaks gradually decreases with increasing SN content, and the ferroelectric-relaxor transition temperature (TF-R) is depressed to room temperature. The evolution behaviors might facilitate our cognition about the mechanism between phase structure and multiple electrical properties of BNT-based ceramics.
关键词： BNT-BKT,(Sr1/3Nb2/3)4+,Phase transition,Field-induced strain,Energy storage
更新于2025-09-23 15:23:52
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Energy Management and Coordinated Control Strategy of PV/HESS AC Microgrid during Islanded Operation
摘要： An energy management control strategy is proposed for an islanded AC microgrid with the hybrid energy storage system (HESS) including the battery and the supercapacitor (SC). According to the state of charge(SOC) of the battery, the photovoltaic (PV) system can work in either maximum power point tracking (MPPT) mode or load power tracking (LPT) mode to prevent the battery from over charging. Similarly, the load shedding control (LSC) is adopted to prevent the battery from over discharging. A virtual impedance control strategy is proposed to achieve effective power sharing in hybrid energy storage systems, where battery provides steady state power and SC only supports transient power fluctuations. The terminal voltage of SC can be restored to the initial value automatically by introducing a high pass filter in the voltage control loop. The AC bus voltage maintains constant using the voltage secondary controller to compensate the voltage droop caused by the virtual impedance control strategy. Simulation results under typical working conditions verify the correctness and effectiveness of the proposed control strategy.
关键词： hybrid energy storage system (HESS),energy management,state of charge (SOC),Coordinated control,voltage restoration,islanded operation,virtual impedance
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE 21st International Multi-Topic Conference (INMIC) - Karachi, Pakistan (2018.11.1-2018.11.2)] 2018 IEEE 21st International Multi-Topic Conference (INMIC) - Optimum Unit Sizing of Stand-Alone PV-WT-Battery Hybrid System Components Using Jaya
摘要： Renewable energy sources (RESs) are considered as reliable and green electric power generations. Photovoltaic (PV) and wind turbine (WT) are used to provide electricity in remote areas. The optimum unit sizing of hybrid RESs components is a vital challenge in a stand-alone system. This paper presents Jaya algorithm for optimum unit sizing of a PV-WT-Battery hybrid system to fulfill the consumer’s load at minimal cost. The reliability of the system is considered by a maximum allowable loss of power supply probability (LP SPmax). The results obtained from the Jaya algorithm show that the PV-WT-Battery hybrid system is the most economical and cost-effective solution for all proposed LP SPmax values as compared to PV-Battery and WT-Battery systems.
关键词： Unit sizing,optimization,renewable energy sources,energy storage system,LPSP
更新于2025-09-23 15:23:52
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Optical memory characteristics of solution-processed organic transistors with self-organized organic floating gates for printable multi-level storage devices
摘要： Exploring optical memory functions in nonvolatile organic field-effect transistor (OFET) memories with top-gate/bottom-contact (TG/BC) configurations can offer effective routes for developing printable, high-density organic memory circuits capable of multi-level data storage. Here, we use a solution process to fabricate TG/BC OFET devices with organic floating-gate structures and investigate their memory characteristics under light illumination. A solution-processable organic composite of 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) and poly(methylmethacrylate) is employed to self-organize organic floating-gate structures on a solution-processed semiconductor layer composed of poly(3-hexylthiophene) (P3HT). The floating-gate OFET devices programmed with blue, green, and red light exhibit large threshold voltage (Vth) shifts of approximately 30 V and stable charge retention characteristics even under light illumination. The devices also exhibit high sensitivity to incident light during programming, and the degree of Vth shift and the on-state current can be tuned using light and programming voltage to facilitate distinct storage and readout of multi-level data.
关键词： floating-gate memory,organic field-effect transistor,top-gate/bottom-contact configuration,multi-level data storage,solution-processable organic material
更新于2025-09-23 15:23:52