Journal of Power Sources最新文献

{"title":"Electrochemical activation endows iodine-doped bismuth telluride with rich vacancies for highly performance aqueous zinc-based battery","authors":"Liang Chen ,&nbsp;Quan Cai ,&nbsp;Yi Liu ,&nbsp;Xuehui Xie ,&nbsp;Haijiao Xie","doi":"10.1016/j.jpowsour.2025.236434","DOIUrl":"10.1016/j.jpowsour.2025.236434","url":null,"abstract":"<div><div>Researchers are increasingly interested in bismuth chalcogenides (BCs) as cathode materials for aqueous zinc-based batteries (AZBs) due to their ultra-flat voltage plateau. However, the practical application of BCs is limited by their insufficient capacity, which results from poor conductivity and slow ion diffusion. To address these challenges, we propose a novel approach utilizing iodine-doped Bi₂Te₃ (IBT) sheets with a unique porous structure as a cathode material. Density functional theory calculations indicate that iodine doping significantly reduces the energy barrier for tellurium vacancy formation. Due to its abundant defects, IBT demonstrates a superior ion diffusion coefficient in comparison to pure Bi₂Te₃ (BT). Additionally, the introduction of iodine heteroatoms imparts conductor-like properties to IBT, thereby enhancing its electronic conductivity. Consequently, the IBT cathode exhibits a satisfactory capacity of 320 mA h g⁻¹ at a current density of 0.5 A g⁻¹. When cycled at 20 A g⁻¹, the IBT cathode shows an initial capacity of 176.6 mA h g⁻¹ and maintains a substantial capacity of 150.5 mA h g⁻¹ after 2000 cycles. This study conclusively demonstrates that halogens can serve as effective dopants to modify the physicochemical characteristics of BC materials, suggesting a promising strategy for the development of high-performance cathodes in AZBs.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236434"},"PeriodicalIF":8.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350456","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":"Dual-crosslinked sulfonated poly (ether ether ketone) membranes with isophthalic acids for enhanced proton exchange membrane fuel cells","authors":"Gaae Yun,&nbsp;Dongjun Lee,&nbsp;Insung Bae","doi":"10.1016/j.jpowsour.2025.236450","DOIUrl":"10.1016/j.jpowsour.2025.236450","url":null,"abstract":"<div><div>To facilitate the practical application of hydrocarbon-based proton exchange membranes (PEMs) in proton exchange membrane fuel cells (PEMFCs), it is imperative to address and mitigate their significant humidity dependence, including proton conductivity and membrane stability. Herein, crosslinked sulfonated poly(ether ether ketone) (SPEEK) membranes with sulfonated isophthalic acid (SIPA) and isophthalic acid (IPA) as crosslinkers are investigated for realizing robust and high-performance PEMFCs. Through chemical reduction and subsequent crosslinking reactions, dual-crosslinked SPEEK (dc-SPEEK) membranes are synthesized with optimized SIPA and IPA ratios. The dc-SPEEK membranes demonstrate enhanced proton conductivity, water uptake, and membrane stability compared to non-crosslinked SPEEK and single-crosslinked SPEEK membranes. Morphological analysis reveals a well-developed phase separation in dc-SPEEK, which enables effective proton transport, resulting in superior proton conductivity of 278.8 and 8.9 mS cm⁻¹ at relative humidity 100 % and 50 %, respectively. Additionally, membrane electrode assemblies fabricated with dc-SPEEK exhibit significantly higher current and power densities of 287.03 mW cm⁻² compared to other membranes, highlighting their potential for practical fuel cell applications. Overall, the results underscore the importance of crosslinking strategies in improving the performance and durability of PEMs for PEMFCs.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236450"},"PeriodicalIF":8.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350457","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":"Multi-anionic and multi-cationic high-entropy oxides as electrode materials for lithium-ion batteries","authors":"Olga A. Podgornova,&nbsp;Nina V. Kosova","doi":"10.1016/j.jpowsour.2025.236463","DOIUrl":"10.1016/j.jpowsour.2025.236463","url":null,"abstract":"<div><div>High-entropy materials are promising for using as anode materials for energy storage. Here, the possibility of obtaining single-phase multi-anionic and multi-cationic high-entropy oxides Li_x(Co_0.2Cu_0.2Mg_0.2Ni_0.2Zn_0.2)_2-xO_2-xF_x (0.0 ≤ x ≤ 1.0) with the rock salt structure is investigated. The electrode materials were prepared by the mechanochemically assisted solid-state synthesis and co-precipitation method. The as-prepared anode materials were characterized by X-ray powder diffraction, cyclic voltammetry, galvanostatic cycling, impedance spectroscopy and galvanostatic intermittent titration technique. The maximum <em>x</em> value for obtaining the single-phase materials is 0.5 for two synthesis methods. When used as an anode material for Li⁺ ion batteries, Li_0.5(Co_0.2Cu_0.2Mg_0.2Ni_0.2Zn_0.2)_1.5O_1.5F_0.5 (<em>x</em> = 0.5) exhibits improved reversibility and kinetics of the electrochemical reactions compared to (Co_0.2Cu_0.2Mg_0.2Ni_0.2Zn_0.2)O (<em>x</em> = 0.0). Li_0.5(Co_0.2Cu_0.2Mg_0.2Ni_0.2Zn_0.2)_1.5O_1.5F_0.5 obtained by the solid-state synthesis provides the highest reversible capacity of 562.2 mAh g⁻¹ (89 % of the theoretical capacity) with a Coulombic efficiency of 99.5 % during prolonged cycling, while Li_0.5(Co_0.2Cu_0.2Mg_0.2Ni_0.2Zn_0.2)_1.5O_1.5F_0.5 prepared by co-precipitation method and (Co_0.2Cu_0.2Mg_0.2Ni_0.2Zn_0.2)O prepared by solid-state synthesis and co-precipitation show a reversible capacity of 366.9, 329.9 and 238.7 mAh g⁻¹, respectively.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236463"},"PeriodicalIF":8.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350453","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 output performance of paper based fuel cells with multiple electrodes","authors":"Lifeng Dong,&nbsp;Changli Wang,&nbsp;Jianfeng Xu,&nbsp;Junfeng Xiao","doi":"10.1016/j.jpowsour.2025.236357","DOIUrl":"10.1016/j.jpowsour.2025.236357","url":null,"abstract":"<div><div>Paper-based fuel cells have garnered significant attention owing to their cost-effectiveness and portability. Nevertheless, the fuel utilization rate remains significantly low, and there are lingering concerns regarding the accuracy of numerical simulation models. Additionally, the influence of wetting processes on the transient performance of the cell has been understudied. This work models and analyzes the comprehensive process, encompassing mass transfer, chemical reactions, and electrical conversion. We utilize transient calculations to assess the corresponding liquid flow and voltage drop, while steady-state calculations are employed to analyze the polarization curve and maximum power density. Furthermore, we propose a novel architecture featuring multiple electrodes to sort out the issue of fuel utilization efficiency. The results suggest that the concentration distribution of oxygen and carbon dioxide impacts cellular performance. Besides, an appropriate multi-electrode configuration can mitigate fuel mixing, thereby significantly enhancing fuel utilization efficiency and maximum output power. Compared to single-electrode fuel cells, the maximum fuel utilization rate of four-electrode cells has increased from 0.461 % to 1.451 %, while the maximum output power has surged from 0.49 mW to 1.89 mW. The model and structural design present herein offer valuable insights for the future development of paper-based fuel cells.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236357"},"PeriodicalIF":8.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350455","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":"Comparing the electrical performance of commercial sodium-ion and lithium-iron-phosphate batteries","authors":"Mathias Rehm ,&nbsp;Marco Fischer ,&nbsp;Manuel Rubio Gomez ,&nbsp;Moritz Schütte ,&nbsp;Dirk Uwe Sauer ,&nbsp;Andreas Jossen","doi":"10.1016/j.jpowsour.2025.236290","DOIUrl":"10.1016/j.jpowsour.2025.236290","url":null,"abstract":"<div><div>Commercial sodium-ion batteries with layered oxides as cathode material are available today. They can be produced with highly abundant raw materials and are considered environmentally friendly and cost-effective. Thus, sodium-ion batteries could replace lithium-ion batteries with lithium-iron-phosphate cathode on the market to some extent. However, a systematic evaluation of their electrical performance over different temperature ranges and a comparison to state-of-the-art lithium-ion batteries is still missing. In this study, we systematically compare the electrical performance of a high-energy and a high-power sodium-ion battery with a layered oxide cathode to a state-of-the-art high-energy lithium-ion battery with a lithium-iron-phosphate cathode for temperatures ranging from 10<!--> <!-->°C to 45<!--> <!-->°C. Both state-of-charge and temperature have a higher influence on the pulse resistance and the impedance of the sodium-ion batteries than the lithium-iron phosphate batteries. We show that in the low state-of-charge region, below 50<!--> <!-->%, the energy efficiency losses of the sodium-ion batteries are approximately twice as high compared to cycling the cells above 50<!--> <!-->% state-of-charge. This effect is even higher for the more application-oriented constant power instead of constant current measurements. Our findings indicate that the state-of-charge during cycling significantly affects the efficiency of sodium-ion batteries and should therefore be taken into account.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236290"},"PeriodicalIF":8.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350454","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":"Tailoring thermal expansion for next-generation energy systems: Integrating the potential of NTE materials in SOFCs and beyond","authors":"Muhammad Bilal Hanif","doi":"10.1016/j.jpowsour.2025.236460","DOIUrl":"10.1016/j.jpowsour.2025.236460","url":null,"abstract":"<div><div>The phenomenon of Negative thermal expansion (NTE) has garnered significant attention for its potential to revolutionize material design, particularly in the context of energy conversion and functional devices. In solid oxide fuel cells (SOFCs), the mismatch in thermal expansion between cathode, anode, and electrolyte materials poses a significant challenge, potentially leading to performance degradation, delamination, and structural failure during thermal cycling, thereby compromising long-term operational stability. This review provides a comprehensive exploration of the role of NTE materials in mitigating these issues, with a focus on their integration into SOFC components, including composite electrodes and electrolytes. We also discuss the incorporation of NTE materials, such as Y₂W₃O₁₂ (YWO), Sm_0.85Zn_0.15MnO₃ (SZM), and NdMnO₃ (NM), into perovskite-based electrodes to tailor the thermal expansion coefficients (TECs) of composite materials, thereby reducing thermal stresses at the electrode-electrolyte interface. Notably, the review examines strategies for optimizing material compatibility through advanced sintering techniques, topology optimization, and doping strategies, which collectively contribute to improving the thermal stability and durability of SOFCs under harsh operating conditions. Furthermore, the review critically analyzes the electrochemical performance of NTE-enhanced composites, addressing the balance between structural stability and catalytic activity. The trade-offs involved in achieving optimal electrochemical performance without compromising the long-term stability of the materials are discussed, highlighting the need for future research to refine these approaches. The potential of NTE materials is also explored beyond SOFCs, extending to other high-temperature applications such as electronic packaging and thin-film devices, where controlled thermal expansion is essential for maintaining material stability. This review not only highlights the transformative role of NTE materials in advancing SOFC technology but also paves the way for their integration into a wide range of energy and functional applications, offering significant improvements in thermal management and device reliability.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236460"},"PeriodicalIF":8.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350458","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":"The utilization of high saline sodium chloride containing waters in solid oxide electrolysers","authors":"Jan Uecker ,&nbsp;Lucy Nohl ,&nbsp;Vaibhav Vibhu ,&nbsp;Jean-Pierre Poc ,&nbsp;Pritam Chakraborty ,&nbsp;Izaak C. Vinke ,&nbsp;Shibabrata Basak ,&nbsp;L.G.J.(Bert) de Haart ,&nbsp;Rüdiger-A. Eichel","doi":"10.1016/j.jpowsour.2025.236390","DOIUrl":"10.1016/j.jpowsour.2025.236390","url":null,"abstract":"<div><div>State-of-the-art electrolyser systems are based on the utilization of highly pure freshwater. This could lead to an increase in freshwater demand and a worsening of freshwater water scarcity. One solution is the direct use of saline waters such as seawater or wastewaters from industry. In this work, the impact of sodium chloride contamination in waters on high temperature solid oxide electrolysis cells is investigated. Thus, the utilization of high saline wastewater from industry and an accelerated stress test for the use of seawater in SOECs is evaluated. The initial performance and stability are compared with results gathered by utilizing high-purity freshwater for steam generation. An increased degradation rate was observed for the sodium chloride solution after 400 h of operation. The increased degradation is mainly caused by an accelerated increase in ohmic and polarisation resistance. More specifically, the charge transfer process in the Ni-YSZ fuel electrode was found to contribute significantly to the increased degradation. Post-test characterization using XPS and SEM-EDX showed sodium particle deposition on the fuel electrode surface contact layer confirming the transport of salt to the cell. The cross-section analysis by SEM showed an accelerated Ni agglomeration in the Ni-YSZ fuel electrode compared to pure water operation.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236390"},"PeriodicalIF":8.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351287","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":"Development of an efficient single-atom catalyst using a Fe/Co@MoS2-CFC anode and a BiVO4-CFC cathode for the degradation of berberine and power generation under visible light irradiation","authors":"Qiyang Cheng ,&nbsp;Deming Xia ,&nbsp;Yidan Zhang ,&nbsp;Lifen Liu ,&nbsp;John Crittenden","doi":"10.1016/j.jpowsour.2025.236459","DOIUrl":"10.1016/j.jpowsour.2025.236459","url":null,"abstract":"<div><div>Antibiotics (or pharmaceuticals) have negative effects on the ecology and require efficient treatment. Here, Enhancing degradation performance of berberine(BBR) in PFC(photocatalytic fuel cell), a Fe-Co dual metal single atom species confined in MoS₂ (Fe/Co@MoS₂) with S-vacancy active sites was prepared and confirmed as effective photoanode in PFC with BiVO₄ as cathode. The mechanism and reason for this enhancement was investigated and clarified. The increase in activity arises from the efficient separation of photogenerated carriers, enhanced by piezoelectric effect. Photocatalysis over Fe/Co@MoS₂ can remove 100 % BBR within 40 min under visible light. Photocatalytic fuel cell (Fe/Co@MoS₂-CFC || BiVO₄-CFC) can degrade 93 % BBR with a maximum power density of 4.5 mW/m² without additional electrolytes. Active species studies and DFT calculations reveal a mechanism that involving the synergistic effects of holes, hydroxyl radicals, and singlet oxygen. This work provides high-efficiency antibiotic treatment method and new dual-metal single-atom catalyst for AOPs(Advanced oxidation Processes).</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236459"},"PeriodicalIF":8.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351289","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":"Merging PEDOT and polyaniline for cost-effective yet high performance flexible electrochromic-supercapacitor dual device","authors":"Hui Li ,&nbsp;Fang Liu ,&nbsp;Ge Zhang ,&nbsp;Wen Wang ,&nbsp;Weiqiang Zhou ,&nbsp;Jingkun Xu ,&nbsp;Jianming Zhang ,&nbsp;Baoyang Lu ,&nbsp;Yuqiao Zhang ,&nbsp;Long Zhang","doi":"10.1016/j.jpowsour.2025.236435","DOIUrl":"10.1016/j.jpowsour.2025.236435","url":null,"abstract":"<div><div>Electrochromic-supercapacitor devices (ESDs) employing conjugated polymers (CPs) display elegant advantages in versatility and flexibility, which are essential for the development of multifunctional and wearable electronic devices. However, achieving both cost-effectiveness and high performance remains a considerable challenge in the preparation of CPs-based ESDs. Herein, we introduce a novel design strategy utilizing a conjugated polymer dual network (CPDN), specifically integrating poly(3,4-ethylenedioxythiophene) (PEDOT) and polyaniline (PANI). This strategy involves the synthesis of a dual-target crosslinked precursor, followed by polymerized into a CPDN via one-step, low-potential electrochemical polymerization. The obtained polymer exhibits excellent electrochromic and capacitive performances, characterized by fast switching time (about 1 s), a high coloring efficiency (CE) value (322 cm² C⁻¹), a robust optical contrast (41 % at 610 nm), and an impressive specific capacitance (357 F g⁻¹ at 1 A g⁻¹). The fabricated flexible and economical ESDs by this CPDN demonstrate a reversible color transition between yellow and purple during the doping (charging) and dedoping (discharging) processes, maintaining 86.4 % stability after 1000 cycles. This feature facilitates the intelligent monitoring of energy storage levels in ESDs by visual color changes. The proposed polymer composite is therefore expected to provide an innovative CPs-based candidate for flexible ESDs.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236435"},"PeriodicalIF":8.1,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351288","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":"Modeling of temperature characteristics of lithium-ion batteries considering the state dependency and its robust estimation of internal temperature","authors":"Xiaoyong Zeng ,&nbsp;Laien Chen ,&nbsp;Xiangyang Xia ,&nbsp;Yaoke Sun ,&nbsp;Jiahui Yue","doi":"10.1016/j.jpowsour.2025.236432","DOIUrl":"10.1016/j.jpowsour.2025.236432","url":null,"abstract":"<div><div>Accurate internal temperature estimation of lithium-ion batteries (LIBs) plays an important role in their safe and economical application. However, the traditional observer estimation method based on linear thermal models cannot accurately describe the nonlinear dynamics of the LIB, and the data-driven estimation approach based on an open loop structure makes it difficult to obtain satisfactory robustness. To bridge this research gap, we construct a state-dependent model to represent the LIB's nonlinear dynamics. The coefficients of this model are implemented by a set of radial basis function neural networks, thus the model considers the actual state of the LIB under different working conditions. Based on the identified state-dependent model offline, an online estimation method of the internal temperature is implemented using the extended Kalman filter (EKF). Furthermore, the robustness is further verified by the extended state observer-EKF. The validation results for different batteries and working conditions show that the root mean square error (RMSE) does not exceed 0.30 °C in the presence of wrong initial values, and it does not exceed 0.28 °C in the presence of bias noise.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"633 ","pages":"Article 236432"},"PeriodicalIF":8.1,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143238502","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}