Journal of energy storage最新文献

{"title":"A multichambered carbon based electrode materials to realize efficient sodium-ion batteries","authors":"Zeeshan Ali ,&nbsp;Muhammad Burhan Shafqat ,&nbsp;Muhammad Tayyab Ahsan ,&nbsp;Muhammad Ali ,&nbsp;Ahmad Saeed ,&nbsp;Rajab Hussain ,&nbsp;Tayyaba Noor ,&nbsp;Sofia Javed","doi":"10.1016/j.est.2024.114804","DOIUrl":"10.1016/j.est.2024.114804","url":null,"abstract":"<div><div>Sodium-ion batteries (SIBs) have emerged as a compelling alternative to lithium-ion counterparts, owing to the widespread availability and low cost of sodium. However, to achieve successful commercialization, the development of a high-performance electrode material is crucial. This study presents a facile synthesis strategy for the production of multichambered carbon cubes (MCCs) derived from ZIF-8 precursors. The optimized process mesoporous MCCs which were then embedded with zinc selenide (ZnSe@MCCs) for the anode and infused with sulfur (S@ZnSe@MCCs) to create the cathode of SIBs. The uniform, hierarchically porous MCC morphologies enable deep electrolyte penetration, unlocking the full potential of these electrode materials. SIBs utilizing ZnSe@MCCs anodes exhibited impressive sodium storage capacities (exceeding 300 mAh g⁻¹ after 1000 cycles) and rate capabilities. Moreover, when employed as the cathode, the S@ZnSe@MCCs effectively suppressed the polysulfide shuttle phenomenon. The performance of these sodium-ion cells underscores the potential of MCCs to enable high capacity, long cycle life, and fast kinetics, paving the way for practical and efficient sodium-ion battery technologies.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114804"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and analysis of two-stage bidirectional power converter for vehicle-to-grid technology with fuel cell-battery electric vehicle","authors":"Elanur Ekici ,&nbsp;Tahsin Koroglu ,&nbsp;Özgür Çelik","doi":"10.1016/j.est.2024.114792","DOIUrl":"10.1016/j.est.2024.114792","url":null,"abstract":"<div><div>This paper presents the design and analysis of an isolated bidirectional two-stage power converter for vehicle-to-grid (V2G) technology with a fuel cell (FC) battery electric vehicle (FCBEV). In the first stage, the primary side employs a quadratic boost converter to achieve higher voltage levels, while the secondary side uses a voltage balancer circuit to equalize the DC subgrid terminal voltages. In the second stage, a T-type inverter is used for grid connection, effectively minimizing total harmonic distortion (THD). An Artificial Neural Network (ANN)-based maximum power point tracking technique combined with a Genetic Algorithm (GA) has been used to extract the maximum energy from the FC under changing temperature and pressure conditions in the system. The performance of the proposed converter has been evaluated and validated through simulation studies using MATLAB/Simulink software. The results demonstrate that the performance of the proposed converter is satisfactory under varying operating conditions. The grid current THD is maintained below 2.35 % in accordance with IEEE 519 standards. The proposed converter and control strategy facilitate the integration of EVs with renewable energy sources and bipolar hybrid AC/DC microgrids.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114792"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of internal cell temperature variations under different abuse test conditions using embedded temperature sensors","authors":"George Darikas ,&nbsp;Haodong Chen ,&nbsp;Anup Barai ,&nbsp;Peter Miller ,&nbsp;Begum Gulsoy ,&nbsp;Timothy A. Vincent ,&nbsp;Guillaume Remy ,&nbsp;Mark A. Williams ,&nbsp;Mark Amor-Segan ,&nbsp;David Greenwood","doi":"10.1016/j.est.2024.114724","DOIUrl":"10.1016/j.est.2024.114724","url":null,"abstract":"<div><div>In this study, the internal temperature of commercially available 21,700-format cylindrical lithium-ion cells is in-situ monitored during three different abuse test conditions. Three typical abuse conditions, namely, nail penetration, over-temperature, and overcharge, were adopted to trigger the cells to thermal runaway. In the nail penetration and over-temperature tests, where the cells underwent thermal runaway, the peak difference between the cell core and surface temperature reached up to 186.6 °C and 331.8 °C respectively. Temperature differences up to 36.7 °C were observed in the overcharge tests, where the cell's internal protection devices prevented thermal runaway. After the abuse tests, post-mortem X-ray CT scans were used to investigate the cell structural integrity, including sidewall ruptures, active material ejection and jelly roll deformation. This study highlights that the core temperatures measured by embedded sensors are significantly higher than the cell surface during thermal runaway. In addition, the core-surface temperature difference is dependent on the triggering mechanisms and propagation of thermal runaway.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114724"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental, numerical, and machine learning study of vertical thermal energy storage filling with novel hybrid nano- and bio-based phase change material","authors":"Mohammad Abdolahimoghadam ,&nbsp;Masoud Rahimi","doi":"10.1016/j.est.2024.114815","DOIUrl":"10.1016/j.est.2024.114815","url":null,"abstract":"<div><div>In this project, an experimental-designed vertical double-tube thermal energy storage (TES) system was employed to analyze the storing and releasing of energy by a novel bio-based phase change material (bio-PCM) and nano-based bio-PCM (bio-nPCM). The evaluation encompassed testing of the bio-PCM, comprising coconut oil and beeswax, and the bio-nPCM, incorporating 2 wt% Gr-Cu hybrid nanoparticles. Furthermore, a machine learning model based on an artificial neural network (ANN) was developed, utilizing 1566 data and 200 distinct structures. The outcomes of the experiments, in comparison with the contours of temperature, liquid fraction, and streamline derived from the modeling, demonstrated that natural convection primarily influences the melting of both bio-PCM and bio-nPCM. Whereas, conduction heat transfer was the dominant factor during the solidification. During the melting, both materials' temperatures revealed non-linear and stepwise changes in the gravity direction. Although bio-PCM's temperature changes were linear and layered in the solidification, for the bio-nPCM, the temperature reductions occurred non-linearly and step-wisely due to enhanced thermal conductivity. Also, the nanoparticles' introduction accelerated the melting and solidification rates by 67.59 % and 56.32 %, respectively. An ANN was developed based on inputs including seven different datasets of characteristics of both PCMs. Multilayer perceptron-based ANN, comprised two hidden layers and housing 20 and 15 neurons. The melting's liquid fraction and time were predicted with errors of ±4.55 % and ± 0.023 %, respectively. Also, the estimation of solidification's liquid fraction and time had errors of ±2.3 % and ± 0.013 %, respectively. The outcomes of this research provide a strategic framework for reducing the reliance on petroleum-based PCMs within renewable energy systems. Furthermore, integrating machine learning results offers an avenue for optimizing energy storage and release in TES systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114815"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermodynamic performance analysis of retrofitting decommissioned coal-fired power plant by Carnot battery energy storage","authors":"Yuelong Cui ,&nbsp;Kaijun Jiang ,&nbsp;Huimin Wei ,&nbsp;Xiaoze Du","doi":"10.1016/j.est.2024.114744","DOIUrl":"10.1016/j.est.2024.114744","url":null,"abstract":"<div><div>Retrofitting decommissioned coal-fired power plants (CFPPs) to the Carnot battery (CB) with thermal energy storage (TES) could be an effective way to help the grid absorb more renewable energy. Towards the parameter matching problem in reconstructing the retired CFPP into CB, this paper proposes the feedwater temperature adjustment method and the steam parameter adjustment method to adjust the structure of the Rankine cycle. The results show that the feedwater temperature adjustment method and steam parameter adjustment method can improve the round-trip efficiency of power-to-heat (P2H) type schemes by 0.29 % to 0.95 % and 0.91 % to 0.97 %, respectively. As for CB constructed by heat pump (HP) form, the two methods can improve the round-trip efficiency by 0.09 % to 0.38 % and 0.95 % to 1.02 %, respectively. The sensitivity analysis shows that the feedwater temperature adjustment method is suitable for P2H type schemes and sensitive to variations in exhaust steam pressure. While the steam parameter adjustment method is sensitive to the heat absorption parameter on the heat source side of the matching process, a 1.36 % increase in efficiency can be achieved by regulating the thermodynamic parameters. Under combined heat and power mode, the energy utilization efficiency of CB can reach the maximum of 79.86 % (P2H) and 94.30 % (HP), respectively. At this point, two adjustment methods mentioned above can still be used to obtain efficiency gains close to the power generation model at different heat supply loads. The discounted CO2 reduction factors of different methods can reach about 0.38 t/MWh (P2H) and 0.46 t/MWh (HP) under different design conditions, respectively. This work would be expected to provide a detailed reference for the utilization of decommissioned CFPPs retrofitted to CB for renewable energy consumption.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114744"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MnO2 as bifunctional oxygen electrocatalyst with pseudocapacitive behavior for high-power rechargeable seawater batteries","authors":"Seohae Kim ,&nbsp;Dowan Kim ,&nbsp;Youngsik Kim ,&nbsp;Jehee Park","doi":"10.1016/j.est.2024.114805","DOIUrl":"10.1016/j.est.2024.114805","url":null,"abstract":"<div><div>Seawater batteries (SWBs) represent a promising energy storage solution because they use abundant, low-cost Na ions from seawater. However, the power performance of SWBs is limited by the sluggish kinetics of the oxygen evolution and reduction reactions (OER/ORR) at seawater cathodes. In the present study, to address these limitations, we explored the use of manganese dioxide (MnO₂) as a bifunctional electrocatalyst with pseudocapacitive behavior to enhance OER/ORR catalytic activity and power performance. MnO₂ nanoparticles were synthesized via a straightforward precipitation method, resulting in a material with an amorphous structure, which is conducive to improved capacitive performance. Electrochemical characterization revealed that the SWBs with MnO₂ exhibited significantly enhanced power output and cycling stability relative to the cell without the catalyst. These improvements are attributed to the hybridized effects of pseudocapacitance and catalytic activity, which accelerate charge storage and release. Our findings suggest that MnO₂ is a promising material for enhancing the performance of SWBs, paving the way for developing next-generation energy storage systems with superior efficiency and stability.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114805"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced electrochemical performance of MoS2@CdS@GO ternary heterostructures for asymmetric supercapacitors","authors":"Sheikh Irfan ,&nbsp;Malik Aalim ,&nbsp;Moayad Husein Flaifel ,&nbsp;Irfan Nazir ,&nbsp;M.A. Shah ,&nbsp;Muzaffer Qadir Lone ,&nbsp;Arfat Firdous ,&nbsp;Altaf Hussain Pandith ,&nbsp;G.N. Dar","doi":"10.1016/j.est.2024.114788","DOIUrl":"10.1016/j.est.2024.114788","url":null,"abstract":"<div><div>Graphene oxide (GO) combined with transition metal sulfides has been identified as a promising approach for energy storage, offering improved properties over pure transition metal sulfides. In this work, a ternary heterostructure of MoS₂, CdS, and GO (MoS₂@CdS@GO) was synthesized via a hydrothermal method. The structure was characterized using XRD, XPS, EDAX, Raman spectroscopy, UV–visible spectroscopy, and TEM. TEM images revealed that CdS nanoparticles are surrounded by MoS₂ and GO sheets. UV analysis confirmed that adding MoS₂@CdS to GO reduced the band gap of the composite. Electrochemical testing of GO, CdS, MoS₂, MoS₂@GO, MoS₂@CdS, and MoS₂@CdS@GO showed that the MoS₂@CdS@GO composite achieved an impressive specific capacitance of 1262 F/g at a scan rate of 6 mV/s and retained 91 % of its capacitance after 5000 cycles. This was attributed to the enhanced performance of MoS₂@GO in combination with CdS, which provides greater ion buffering and better charge storage. In practical terms, an asymmetric supercapacitor (ASC) utilizing MoS₂@CdS@GO showed 86.9 % capacitance retention after 5000 cycles and reached an energy density of 40.69 Wh/kg at a power density of 586.68 W/kg, highlighting its potential for energy storage devices.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114788"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A PVDF-HFP/YSZ nanofiber composite solid-state electrolyte by in-situ polymerization of 1,3-dioxolane for 4.5 V high-voltage NCM811 battery","authors":"Wenjie Yuan,&nbsp;Jinlong Liao,&nbsp;Songde Huang,&nbsp;Dakun Song,&nbsp;Qinting Su,&nbsp;Cuihua Li,&nbsp;Jinhua He","doi":"10.1016/j.est.2024.114618","DOIUrl":"10.1016/j.est.2024.114618","url":null,"abstract":"<div><div>Solid lithium metal batteries with solid polymer electrolytes have advantages in terms of high energy density and safety. However, their application is still hindered by unstable solid electrolyte interfaces (SEI and CEI) and uncontrolled dendrite growth. Here, a composite skeleton loaded with dielectric filler yttrium stabilized zirconia nanoparticles (YSZ) on the surface of PVDF-HFP nanofiber filaments is designed, and a novel composite solid electrolyte (CSE) is prepared by in-situ polymerization of DOL (1,3-dioxolane) on this framework to achieve safe and stable high-voltage lithium metal battery (LMB). The dual stable electrode interfaces (CEI and SEI) constructed by in-situ can effectively suppress the generation of lithium dendrites and suppress the degradation of the high-voltage NCM811 positive electrode structure and the generation of cracks in NCM811 particles, endowing the battery with extraordinary performance. The as-obtained CSE exhibits high ionic conductivity of 1.01 × 10⁻³ S cm⁻¹ at 30 °C, the enlarged electrochemical window of 6.0 V, and the Li⁺ transference number is 0.72. The assembled Li|NCM811 battery is capable of stable cycling for 400 cycles at a cut-off voltage of 4.5 V and current density of 1C, with a capacity decay of only 0.074 % per cycle. <!--> <!-->.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114618"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced capacitance of nickel ferrite decorated laser-induced graphene nanocomposite for symmetric supercapacitor device","authors":"Gargi Dhiman ,&nbsp;Kavita Kumari ,&nbsp;Saurabh Dalela ,&nbsp;Faheem Ahmed ,&nbsp;Nagih M. Shaalan ,&nbsp;Parvez A. Alvi ,&nbsp;Ranjeet Kumar Brajpuriya ,&nbsp;Shalendra Kumar","doi":"10.1016/j.est.2024.114743","DOIUrl":"10.1016/j.est.2024.114743","url":null,"abstract":"<div><div>The demand for high-performance energy storage devices, such as supercapacitors, has driven the exploration of hybrid electrode materials with enhanced charge storage capabilities. This study investigates the development of a novel NiFe₂O₄ (NFO) decorated LIG nanocomposite as an advanced electrode material for supercapacitor applications. Firstly, the LIG was synthesized by direct laser-conversion of polyimide to graphene followed by in-situ decoration of NFO nanoparticles by the drop-casting method. This facile strategy resulted in NFO/LIG nanocomposite with well-dispersed NFO nanoparticles, as verified by Raman spectroscopy. Furthermore, the morphological and structural analysis of the nanocomposite was carried out by using FESEM, EDX, and HRTEM. Additionally, XPS analysis revealed the existence of Ni²⁺ and Fe³⁺ ions which create redox active sites within NFO/LIG and permit the diffusion of electrolyte ions to form redox species. The unique physicochemical properties of graphene, combined with the pseudocapacitive characteristics of NFO, are leveraged to enhance specific capacitance, energy density, and overall electrochemical performance. Electrochemical results showed a remarkable increase in the specific capacitance of NFO/LIG nanocomposite (198 mF/cm² at 1.5 mA/cm²), as compared to pure LIG (65 mF/cm² 1.5 mA/cm²). When utilized as a symmetric supercapacitor, the device offers areal specific capacitance of 44 mF/cm² at 1.5 mA/cm². In addition to this, a pouch cell assembly was designed on a flexible substrate using PVA/KOH gel electrolyte demonstrating 18.7 mF/cm² at 5 mV/s, highlighting the potential use of NFO/LIG electrodes in energy storage applications.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114743"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal capacity determination of photovoltaic and energy storage systems for electric vehicle charging stations","authors":"Seung-Ryong Jang,&nbsp;Ah-Yun Yoon,&nbsp;Sung-Soo Kim","doi":"10.1016/j.est.2024.114730","DOIUrl":"10.1016/j.est.2024.114730","url":null,"abstract":"<div><div>With the growing interest in integrating photovoltaic (PV) systems and energy storage systems (ESSs) into electric vehicle (EV) charging stations (ECSs), extensive research has focused on methods to increase the profits of ECS operators (ECSOs). Conventional studies have primarily relied on empirical methods, such as assuming a constant value for the power conversion system (PCS) capacity or modeling it as being dependent on the battery capacity, to design ESSs. However, such empirical methods can lead to suboptimal or excessive determinations of the capacity of a facility. This study proposes a battery-independent PCS model that independently models the battery and PCS capacities in ESS design to overcome the limitations of the conventional model and maximize the profit for ECSOs. The proposed model determines the optimal capacity of ESS and PV to maximize ECSO's profit. The nonlinearities that arise from using a battery-independent PCS model are linearized by the BIG-M method to effectively solve the optimization problem. The proposed model achieved an additional profit of up to 1.5 % compared to the conventional model. Additionally, the proposed model was simulated under various conditions (e.g., decreasing capital investment costs of ESS, changing EV charging demand, changing time-of-use rates, and applying real-time price rates). Accordingly, it is confirmed that the proposed model greatly contributes to improving ECSO profit even under various conditions. Moreover, the proposed model offers a means to determine the optimal capacities of PV and ESS in an ECS, ultimately maximizing ECSO profits.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"106 ","pages":"Article 114730"},"PeriodicalIF":8.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}