EcoMat最新文献

{"title":"PTAA-infiltrated thin-walled carbon nanotube electrode with hidden encapsulation for perovskite solar cells","authors":"Eun Chong Chae,&nbsp;You-Hyun Seo,&nbsp;Bong Joo Kang,&nbsp;Jin Ho Oh,&nbsp;Yeonsu Jung,&nbsp;Jinho Jang,&nbsp;Taehoon Kim,&nbsp;Yong-Ryun Jo,&nbsp;Dong Jun Kim,&nbsp;Taek-Soo Kim,&nbsp;Sang Hyuk Im,&nbsp;Sae Jin Sung,&nbsp;Seong Sik Shin,&nbsp;Soonil Hong,&nbsp;Nam Joong Jeon","doi":"10.1002/eom2.12495","DOIUrl":"https://doi.org/10.1002/eom2.12495","url":null,"abstract":"<p>In perovskite solar cells (PSCs), expensive gold or silver metal has traditionally been utilized as the rear electrode for highly efficient performance. In this context, carbon nanotube (CNT) electrodes have been considered promising rear electrodes because of their excellent electrical conductivity, mechanical strength, and chemical stability in PSCs. Despite these favorable characteristics, concerns have been raised about the power conversion efficiency (PCE) and stability of PSCs based on CNTs due to the porosity of CNT electrodes. In this study, we employed both poly(triarylamine) (PTAA) infiltration and rear electrode hidden encapsulation approaches to address issues related to the porosity of thin-walled carbon nanotube (TWCNT) electrodes to achieve high efficiency and stability. The infiltration of low-molecular-weight PTAA into the TWCNT electrode reduced electrode porosity while simultaneously improving the interfacial contact of the TWCNT layer with the perovskite layer. Furthermore, a novel encapsulation design was employed to prevent air and water exposure of the TWCNT electrode, which significantly enhanced device stability. PSCs with TWCNT rear electrodes developed on the basis of these strategies have the best PCE of 19.5% and show long-term stability, retaining 96% and 74% of the initial PCE after 225 h at maximum power point tracking under AM 1.5G illumination and 916 h at 85°C/85% relative humidity, respectively.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 11","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12495","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microwave-assisted control of PtNi nanoalloy clusters on the nitrogen-doped graphene oxide for energy conversion with oxygen reduction reaction and hydrogen evolution reaction","authors":"Seung Geun Jo,&nbsp;Gil-Ryeong Park,&nbsp;Jemin Kim,&nbsp;Do Hyun Ahn,&nbsp;Rahul Ramkumar,&nbsp;Sun-I Kim,&nbsp;Duck Hyun Lee,&nbsp;Jung Woo Lee","doi":"10.1002/eom2.12499","DOIUrl":"https://doi.org/10.1002/eom2.12499","url":null,"abstract":"<p>Research on the production and utilization of hydrogen energy is essential to overcome the environmental issues caused by fossil fuels. Herein, we anchor Pt<span></span>Ni nanoalloy clusters (Pt-Ni NACs) on nitrogen-doped graphene oxide (NrGO) by a facile microwave-assisted synthesis and analyze the variations of catalyst properties based on the Pt<span></span>Ni composition and the presence of nitrogen. Ni inclusion in the Pt matrix can induce lattice strain and change the electronic structure, while the doped nitrogen into the graphene can enhance electron transfer and improve the durability of the catalyst through strong chemical bonding with the alloy clusters. TEM analysis discovers that the NACs are uniformly decorated in a few-nanometer-size on the graphene surface, and the formation of the Pt<span></span>Ni NACs and structural changes according to composition are confirmed through XRD and XPS. In addition, the structural changes due to N-doping and its bonding with the NACs are observed through Raman spectroscopy and XPS. Electrochemical measurements reveal that Pt_2.6Ni NACs/NrGO exhibits the highest ORR onset potential (0.893 V) and the lowest HER overpotential at 10 mA cm⁻² (22 mV) among other catalysts, and those activities are almost unchanged under long-term durability tests. From these results, Pt_2.6Ni NACs/NrGO is utilized in a zinc-air battery (ZAB) system, demonstrating better battery performance than commercial Pt and Ir-based catalysts. Moreover, it is applied to hydrogen collection, showing linear trend in hydrogen production over time, confirming the catalyst's availability in hydrogen production and utilization.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 12","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12499","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142869175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Halogen-free solvent processed organic solar sub-modules (≈55 cm2) with 14.70% efficiency by controlling the morphology of alkyl chain engineered polymer donor","authors":"Thavamani Gokulnath,&nbsp;Hyerin Kim,&nbsp;Donghyun Song,&nbsp;Ho-Yeol Park,&nbsp;Je-Sung Jee,&nbsp;Young Yong Kim,&nbsp;Jinhwan Yoon,&nbsp;Kakaraparthi Kranthiraja,&nbsp;Sung-Ho Jin","doi":"10.1002/eom2.12496","DOIUrl":"https://doi.org/10.1002/eom2.12496","url":null,"abstract":"<p>Goals of high efficiency, morphological analysis, and the ability to produce organic solar cell (OSC) sub-modules using halogen-free solvents are demanding. In this study, a robust conjugated polymer with thienothiophene π-spacer with pendant alkyl side chain (NapBDT-C12) was synthesized and used to fabricate sub-modules. Excellent efficiencies were demonstrated by a NapBDT-C12 integrated ternary blend, which was used to produce stable small-area-to-sub-module devices using <i>O</i>-xylene. The efficiency of the NapBDT-C12 added small-area ternary devices (PM6:NapBDT-C12:L8-BO) was 18.71%. Owing to the controlled homogeneity of the blend with favorable nanoscale film morphology, enhanced carrier mobilities, and exciton dissociation/splitting properties, contributed to the efficiencies of small-area-to-sub-module OSCs. Moreover, a 55 cm² sub-module with an efficiency of 14.69% was accomplished by bar coating using <i>O</i>-xylene under ambient conditions. This study displays the potential of a ternary blend based OSC device to produce high efficiency scalable sub-modules at ambient conditions.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 11","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12496","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142666087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A review of recent developments in the design of electrolytes and solid electrolyte interphase for lithium metal batteries","authors":"Hyeonmuk Kang,&nbsp;Heechan Kang,&nbsp;Mikyeong Lyu,&nbsp;EunAe Cho","doi":"10.1002/eom2.12498","DOIUrl":"https://doi.org/10.1002/eom2.12498","url":null,"abstract":"<p>Lithium metal batteries offer a promising solution for high density energy storage due to their high theoretical capacity and negative electrochemical potential. However, implementing of these batteries faces challenges related to electrolyte instability and the formation of a solid electrolyte interphase (SEI) on the lithium (Li) metal anode. The decomposition of liquid electrolytes leading to the creation of the SEI emphasizes the significance of the type of Li salt, solvent, and additives designed and used, as well as their interactions during the formation of the SEI. For practical applications, ensuring both the reversibility of the Li metal anode and electrolyte stability at high voltages is crucial. In this review, we explore recent advancements in addressing these challenges through new designs of electrolytes and SEI engineering practices. Specifically, we investigate the effects of electrolyte systems, including carbonate-based and ether-based solutions, along with modifications to these electrolyte systems aimed at achieving a more stable interface with the Li metal anode. Additionally, we discuss various artificial SEI structures based on organic and inorganic components. By critically examining recent research in these areas, this review provides valuable insights into current state-of-the-art strategies for enhancing the performance and safety of Li metal batteries.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 12","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12498","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Minimizing voltage losses in Sn perovskite solar cells by Cs2SnI6 passivation","authors":"Jin Hyuck Heo,&nbsp;Sang Woo Park,&nbsp;Hyong Joon Lee,&nbsp;Jin Kyoung Park,&nbsp;Sang Hyuk Im,&nbsp;Ki-Ha Hong","doi":"10.1002/eom2.12491","DOIUrl":"https://doi.org/10.1002/eom2.12491","url":null,"abstract":"<p>Stability and oxidation are major bottlenecks in improving the performance of Sn-based perovskite solar cells. In this study, we present the formation of an n-type Cs₂SnI₆ double-perovskite (Sn-DP) layer on a (PEAI)_0.15(FAI)_0.85SnI₂ perovskite (Sn-P) layer using an orthogonal solution-processable spray-coating method. This novel approach achieves a minimized <i>V</i>_oc loss of 0.38 V and a PCE of 12.9% under 1 sun conditions. The n-type DP layer effectively passivates tin vacancies, suppresses Sn²⁺ oxidation, reduces defects, and enhances electron extraction. Furthermore, the Sn-DP/Sn-P-based solar cells exhibit excellent light-soaking stability for 1000 h in the air under continuous one sun illumination, which is attributed to the stable Sn⁴⁺ state of the DP layer. Our experimental and theoretical investigations reveal that the type-II band alignment between Sn-DP and Sn-P enhances the stability of the solar cells. The proposed Sn-DP/Sn-P architecture offers a promising pathway for developing Sn-based solar cells.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 11","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12491","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization strategy of triboelectric nanogenerators for high humidity environment service performance","authors":"Xichen Yin,&nbsp;Zhou Chen,&nbsp;Hui Chen,&nbsp;Qing Wang,&nbsp;Qian Chen,&nbsp;Cheng Wang,&nbsp;Chaoyue Ye","doi":"10.1002/eom2.12493","DOIUrl":"https://doi.org/10.1002/eom2.12493","url":null,"abstract":"<p>With triboelectric nanogenerators (TENGs) introduced in 2012, they have emerged in the fields of flexible wearable electronics, portable energy, Internet of Things (IoTs), and biomedicine by virtue of their lightweight, high-energy conversion, low cost, and material selectivity. However, as the application areas of TENGs increase, ambient humidity and human movement generate sweat and moisture that can lead to a decrease in output, so exploring how TENGs operate in high humidity environments is critical to their long-term development. In this paper, different strategies are introduced to enhance TENGs in high humidity environments, such as encapsulation, construction of hydrophobic/superhydrophobic surfaces, and hydrogen bonding enhancement, and discuss the applications of humidity-resistant TENGs in fields such as self-powered sensors, energy harvesters, and motions, and so forth. Finally, we explore the future directions and routes for the development of humidity-resistant TENGs.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 11","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12493","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrostatic charge injection for reusing face masks: Mechanisms, performance, and a household alternative","authors":"Zehua Peng,&nbsp;Zhiyuan Li,&nbsp;Xingcan Huang,&nbsp;Xinge Yu,&nbsp;Michael K. H. Leung,&nbsp;Zuankai Wang,&nbsp;Zhengbao Yang","doi":"10.1002/eom2.12497","DOIUrl":"https://doi.org/10.1002/eom2.12497","url":null,"abstract":"<p>The COVID-19 pandemic underscores the effectiveness of face masks in combating respiratory infectious diseases and the importance of adequate supply. However, the widespread use of disposable masks has led to severe environmental pollution. In this study, we propose a two-step strategy for mask reuse, aimed at both mitigating mask waste pollution and improving mask availability in future epidemic outbreaks. Our strategy involves disinfection and corona charging processes, enabling surgical masks to maintain a filtration efficiency of 88.7% even after five cycles of reuse. We highlight the crucial role of volume charges over surface charges in maintaining filtration performance stability and durability, and we visualize the underlying mechanisms using energy band diagrams and potential well models. Additionally, we introduce a simple household solution for simultaneously drying and charging, making it accessible for widespread use. Our research offers a viable strategy for promoting environmental sustainability and alleviating mask supply pressures during significant public health crises.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 12","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12497","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142868829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pt and Pt-group transition metal 0D vacancy ordered halide perovskites: A review","authors":"Huilong Liu,&nbsp;Shubhra Bansal","doi":"10.1002/eom2.12492","DOIUrl":"https://doi.org/10.1002/eom2.12492","url":null,"abstract":"<p>Lead halide perovskites (LHPs), have attracted considerable attention across various applications owing to their exceptional optoelectronic properties. However, the main challenge hindering the broad adoption of lead halide perovskites lies in their stability and toxicity. In this review, we summarize the outstanding properties of platinum (Pt) halide perovskites, with a particular focus on the stability and applications of Cs₂PtI₆ and its derivatives. Cs₂PtI₆ has shown promising efficiency for photovoltaic devices, as well as photoelectrochemical water splitting with stable behavior in acid or basic conditions. Cs₂PtI₆ also shows promise in gas sensing and thermoelectric devices. The emergence of 2D Pt (II) halide perovskites opens up new avenues for environmentally friendly materials for photonic and optoelectronic devices like room temperature phosphoresce and triplet-triplet annihilation (TTA) based up-conversion.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 11","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12492","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrochemical recycling of lithium-ion batteries: Advancements and future directions","authors":"Stefanie Arnold,&nbsp;Jean G. A. Ruthes,&nbsp;Choonsoo Kim,&nbsp;Volker Presser","doi":"10.1002/eom2.12494","DOIUrl":"https://doi.org/10.1002/eom2.12494","url":null,"abstract":"<p>Lithium-ion batteries (LIBs) are at the forefront of technological innovation in the current global energy-transition paradigm, driving surging demand for electric vehicles and renewable energy-storage solutions. Despite their widespread use and superior energy densities, the environmental footprint and resource scarcity associated with LIBs necessitate sustainable recycling strategies. This comprehensive review critically examines the existing landscape of battery recycling methodologies, including pyrometallurgical, hydrometallurgical, and direct recycling techniques, along with emerging approaches such as bioleaching and electrochemical separation. Our analysis not only underscores the environmental and efficiency challenges posed by conventional recycling methods but also highlights the promising potential of electrochemical techniques for enhancing selectivity, reducing energy consumption, and mitigating secondary waste production. By delving into recent advancements and juxtaposing various recycling methodologies, we pinpoint electrochemical recycling as a pivotal technology for efficiently recovering valuable metals, such as Li, Ni, Co, and Mn, from spent LIBs in an environmentally benign manner. Our discussion extends to the scalability, economic viability, and future directions of electrochemical recycling, and advocates for their integration into global battery-recycling infrastructure to address the dual challenges of resource depletion and environmental sustainability.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 11","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12494","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced approach for active and durable proton exchange membrane fuel cells: Coupling synergistic effects of MNC nanocomposites","authors":"Yeju Jang,&nbsp;Seung Yeop Yi,&nbsp;Jinwoo Lee","doi":"10.1002/eom2.12488","DOIUrl":"https://doi.org/10.1002/eom2.12488","url":null,"abstract":"<p>Atomically dispersed metal and nitrogen co-doped carbon (M<span></span>N<span></span>C) is a promising oxygen reduction reaction (ORR) catalyst for electrochemical energy storage and conversion applications but typically suffers from low durability and activity under the acidic conditions of practical polymer electrolyte exchange membrane fuel cells (PEMFCs). Recently, the performance of M<span></span>N<span></span>C nanocomposites under acidic ORR conditions has been enhanced by exploiting the synergistic coupling effects of their constituents (single-atom sites, nanoclusters, and nanoparticles). The unique geometric structures formed by the coupling of diverse sites in these nanocomposites provide optimal electronic structures and efficient reaction pathways, thus resulting in high activity and long-term durability. This work provides an overview of M<span></span>N<span></span>C nanocomposites as ORR electrocatalysts under practical PEMFC conditions, focusing on activity and durability enhancement methods and highlighting the strategies used to prepare electrocatalytically efficient M<span></span>N<span></span>C nanocomposites containing no or low amounts of platinum group metals. Progress in the development of advanced M<span></span>N<span></span>C nanocomposites as acidic ORR catalysts is discussed, and the pivotal role of synergistic effects resulting from the coupling sites within the nanocomposites is explored together with the characterization methods used to elucidate these effects. Finally, the challenges and prospects of developing M<span></span>N<span></span>C nanocomposites as next-generation electrocatalysts are presented.</p><p>\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":93174,"journal":{"name":"EcoMat","volume":"6 10","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12488","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}