EcoMat最新文献

{"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}

{"title":"From Pb-based MAPbI3−xClx to Pb-free FASnI3−xClx and CsSbCl4 derivatives fabrication in atmospheric conditions for optoelectronic and solar cell applications","authors":"M. Kamruzzaman,&nbsp;Md. Faruk Hossain,&nbsp;J. Antonio Zapien,&nbsp;A. M. M. Tanveer Karim,&nbsp;H. N. Das,&nbsp;M. A. Helal","doi":"10.1002/eom2.12489","DOIUrl":"https://doi.org/10.1002/eom2.12489","url":null,"abstract":"<p>MAPbI₃ is the most attractive perovskite, but toxicity and instability issues hinder its commercial applications. Stability can be improved by halide mixing; however, Pb-free perovskites are designed to alleviate the toxicity and to enable green photovoltaics (PVs). To this end, MAPbI_3-xCl_x, FASnI_3-xCl_x and CsSbCl₄ films are deposited by spay pyrolysis technique in atmospheric conditions. SEM images demonstrated that through this process, high quality film fabrication is possible. Color of the precursor solutions changes with stirring time. High crystallinity and existence of mixed-phases are confirmed by XRD analysis. Compositions greatly impact the morphology and optical properties. Value of α is larger than 10⁵ cm⁻¹ for all films. Band gaps of FASnI_3-xCl_x and CsSbCl₄ are 1.46 eV and 1.52 eV, which are more suitable for PVs, optoelectronic applications than MAPbI_3-xCl_x (E_g = 1.59 eV). The efficiency was obtained as 16.34%, 9.90%, and 13.08% for deposited MAPbI_3-xCl_x, FASnI_3-xCl_x, and CsSbCl₄ films. The lower efficiency can further be enhanced by optimizing parameters, and in this study it was found as 20.78%, 11.93%, and 18.02%. Theoretical calculations show the films can easily produce O₂ by a strong oxidation process. Thus, the favorable characteristics of FASnI_3-xCl_x and CsSbCl₄ make alternative Pb-free perovskites for PV, electronic, and optoelectronic applications.</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":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12489","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449040","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 perovskite solar cells' lead leakage with a cost-effective and 160 days stable encapsulant","authors":"Haoxuan Liu,&nbsp;Can Li,&nbsp;Zongxu Zhang,&nbsp;Yating Shi,&nbsp;Fei Zhang","doi":"10.1002/eom2.12490","DOIUrl":"https://doi.org/10.1002/eom2.12490","url":null,"abstract":"<p>Perovskite solar cells' (PSCs) potential lead leakage seriously threatens ecosystems and human health, significantly hindering their commercialization. In this paper, we develope a cost-effective (less than 2$/m²) and long-term stable SSP film by mixing sulfonated SiO₂ with polyvinyl alcohol (PVA). Combined with polydimethylsiloxane (PDMS) forming the encapsulation layer, it can effectively prevent over 99% of lead leakage under simulated adverse weather conditions with different structures of devices (p-i-n and n-i-p) and modules. Even after 160 days of air storage, the film maintains excellent lead sequestration efficiency. Additionally, it has no negative impact on the performance and stability. This work offers a practical and economical strategy to mitigate the toxicity of perovskite photovoltaic devices, thereby promoting their commercialization.</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":"2024-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12490","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664659","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":"Efficient and spectrally stable pure blue light-emitting diodes enabled by phosphonate passivated CsPbBr3 nanoplatelets with conjugated polyelectrolyte-based energy transfer layer","authors":"Jinu Park,&nbsp;Hyunjin Cho,&nbsp;Joonyun Kim,&nbsp;Yu-Ching Huang,&nbsp;Nakyung Kim,&nbsp;Seoyeon Park,&nbsp;Yunna Kim,&nbsp;Sukki Lee,&nbsp;Jiyoung Kwon,&nbsp;Doh C. Lee,&nbsp;Byungha Shin","doi":"10.1002/eom2.12487","DOIUrl":"https://doi.org/10.1002/eom2.12487","url":null,"abstract":"<p>Lead halide perovskites exhibit a very wide color gamut due to their extremely narrow emission spectra, typically characterized by a full-width at half-maximum (FWHM) of less than 20 nm. Significant advancements have been made in developing highly efficient and stable green, red, and near-infrared perovskite light-emitting diodes (PeLEDs). However, achieving efficient and stable pure blue-emitting PeLEDs remains a significant challenge. In this work, we successfully synthesized monoanionic octyl-phosphonate capped CsPbBr₃ nanoplatelets (OPA-NPLs) using a combination of octyl-phosphonic acid and oleylamine at room temperature, diverging from common approaches that necessitate complex high-temperature methods, such as hot injection, to accommodate short-chain ligands. The OPA-NPLs exhibit pure blue photoluminescence at 462 nm with a FWHM of 14 nm. Compared with CsPbBr₃ nanoplatelets synthesized using oleic acid, OPA-NPLs demonstrate significantly improved thermal stability and higher photoluminescence quantum yield (PLQY) of 90%. Additionally, we introduced Poly[(9,9-bis(3′-((<i>N,N</i>-dimethyl)-<i>N</i>-ethylammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)]dibromide (PFN-Br), a conjugated polyelectrolyte material, as a hole transport layer. This facilitated energy transfer between PFN-Br and the CsPbBr₃ nanoplatelets. The resulting device demonstrated an electroluminescence peak at 462 nm, an extremely narrow FWHM of 14 nm, and a maximum external quantum efficiency (EQE) of 4%. Notably, the device maintained pure blue emission without spectral peak shift even during degradation caused by excess joule heating.</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":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12487","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142447813","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":"Recommended practice for measurement and evaluation of oxygen evolution reaction electrocatalysis","authors":"Hongmin An,&nbsp;Wonchul Park,&nbsp;Heejong Shin,&nbsp;Dong Young Chung","doi":"10.1002/eom2.12486","DOIUrl":"10.1002/eom2.12486","url":null,"abstract":"<p>The Oxygen evolution reaction (OER) is a pivotal technology driving next-generation sustainable energy conversion and storage devices. Establishing a robust analytical methodology is paramount to fostering innovation in this field. This review offers a comprehensive discussion on measurement and interpretation, advocating for standardized protocols and best practices to mitigate the myriad factors that complicate analysis. The initial focus is directed toward substrate electrodes and gas bubbles, both significant contributors to reduced reliability and reproducibility. Subsequently, the review focuses on intrinsic activity assessment, identification of electrochemical active sites, and the disentanglement of competing process contributions. These careful methodologies ensure the systematic delivery of insights crucial for assessing OER performance. In conclusion, the review highlights the critical role played by precise measurement techniques and unbiased activity comparison methodologies in propelling advancements in OER catalyst development.</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":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12486","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262808","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":"Lanthanides in the water electrolysis","authors":"Ashish Gaur,&nbsp;Jatin Sharma,&nbsp;Enkhtuvshin Enkhbayar,&nbsp;Min Su Cho,&nbsp;Jeong Ho Ryu,&nbsp;HyukSu Han","doi":"10.1002/eom2.12484","DOIUrl":"https://doi.org/10.1002/eom2.12484","url":null,"abstract":"<p>The most feasible technique for producing green hydrogen is water electrolysis. In recent years, there has been significant study conducted on the use of transition metal compounds as electrocatalysts for both anodes and cathodes. Peoples have attempted several strategies to improve the electrocatalytic activity of their original structure. One such technique involves introducing rare earth metals or creating heterostructures with compounds based on rare earth metals. The incorporation of rare earth metals significantly enhances the activity by many folds, while their compounds offer structural stability and the ability to manipulate the electronic properties of the original system. These factors have led to a recent boom in investigations on rare earth metal-based electrocatalysts. There is currently a pressing demand for a review article that can provide a comprehensive overview of the scientific advancements and elucidate the mechanistic aspects of the impact of lanthanide doping. This review begins by explaining the electronic structure of the lanthanides. We next examine the mechanistic aspects, followed by recent advancements in lanthanide doping and heterostructure formation for water electrolysis applications. It is expected that this particular effort will benefit a broad audience and stimulate more research in this area of interest.</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 9","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12484","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142244615","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":"Double transition metal MXenes for enhanced electrochemical applications: Challenges and opportunities","authors":"Faiza Bibi,&nbsp;Abdul Hanan,&nbsp;Irfan Ali Soomro,&nbsp;Arshid Numan,&nbsp;Mohammad Khalid","doi":"10.1002/eom2.12485","DOIUrl":"10.1002/eom2.12485","url":null,"abstract":"<p>Double transition metal (DTM) MXenes are a recently discovered class of two-dimensional composite nanomaterials with excellent potential in energy storage applications. Since their emergence in 2015, DTM MXenes have expanded their composition boundary beyond traditional single-metal carbide and nitride MXenes. DTM MXenes offer tunable structures and properties through variations in the constituent transition metals and positioning within the layered lattice. These MXenes can exist in two primary forms: ordered DTMs and solid solutions. The compositional versatility of DTM MXenes offers opportunities to enhance their performance in electrochemical energy storage applications. However, the quality, stability, and surface chemistry of DTM MXenes are influenced by several factors, including the etching process, etchant type, and synthesis route. Currently, limited literature is available on experimentally synthesized DTM MXenes, with most studies focusing on carbide-based MXenes. Most of the articles have dedicated their efforts only to generalized synthesis strategies. Although extensive theoretical studies have explored the suitability of etchants, synthesis parameters, and methods for producing high-quality MXene with selective terminal functional groups, their stability issues have not been thoroughly examined. This review addresses various types of DTM MXenes, their synthesis techniques, and the impact of these methods on their physicochemical properties and electrochemical performance. Additionally, it provides a critical analysis of the causes of instability in MXenes, particularly DTMs, from synthesis to application. The challenges associated with these materials are discussed, along with opportunities and prospects for enhancing synthesis, structural tuning, surface modification, and applications in electrochemical energy storage.</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 9","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12485","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202522","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":"Addressing electrode passivation in lithium–sulfur batteries by site-selective morphology-controlled Li2S formation","authors":"Ilju Kim,&nbsp;Jinkwan Jung,&nbsp;Sejin Kim,&nbsp;Hannah Cho,&nbsp;Hyunwon Chu,&nbsp;Wonhee Jo,&nbsp;Dongjae Shin,&nbsp;Hyeokjin Kwon,&nbsp;Hee-Tak Kim","doi":"10.1002/eom2.12483","DOIUrl":"10.1002/eom2.12483","url":null,"abstract":"<p>The sulfur utilization efficiency of lithium–sulfur batteries is often limited by the uncontrolled electrodeposition of the insulating Li₂S and the resulting electrode passivation. Herein, purposeful electrode and electrolyte design is used to realize site-selective three-dimensional (3D) Li₂S electrodeposition and thus mitigate the above problem. Site-selective Li₂S nucleation is induced at the tips of CoP nanoneedles grown on a carbon cloth electrode, and the 3D growth of Li₂S at these tips without the passivation of the inner part is achieved using a LiBr-containing high-donor-number electrolyte. The controlled Li₂S morphology is rationalized by considering the tip effect, the energy of Li₂S binding on the electrode surface, and the solubility of Li₂S in the electrolyte. Owing to the suppressed electrode passivation, CoP nanoneedle–decorated carbon cloth electrode and LiBr-containing electrolyte deliver a capacity of &gt;1400 mAh g_s⁻¹ at a current density of 0.33 A g_s⁻¹. Thus, this work paves the way for the active control of Li₂S morphology for high-performance lithium–sulfur 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 9","pages":""},"PeriodicalIF":10.7,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eom2.12483","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202523","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}