Materials Science and Engineering: R: Reports最新文献

{"title":"Terpolymer donors incorporating Dichloroquinoxaline segments enable 19.10% efficiency all-polymer solar cells with extremely high open-circuit voltage of 0.986 V","authors":"Chentong Liao ,&nbsp;Wuke Qiu ,&nbsp;Xingjian Dai ,&nbsp;Zhaolong Liu ,&nbsp;Hongli Wang ,&nbsp;Min Deng ,&nbsp;Xiaopeng Xu ,&nbsp;Qiang Peng","doi":"10.1016/j.mser.2025.101127","DOIUrl":"10.1016/j.mser.2025.101127","url":null,"abstract":"<div><div>All-polymer solar cells (all-PSCs) possess mechanical flexibility and manufacturing advantages, yet their power conversion efficiency (PCE) still lags behind perovskite solar cells due to high energy loss (<em>E</em>_loss) and trade-off between open-circuit voltage (<em>V</em>_OC) and short-circuit current density (<em>J</em>_SC). This work addresses these limitations by developing terpolymers incorporating 6,7 difluoro-2-((2-hexyldecyl)oxy)-3-methylquinoxaline (Qx) segment (PM6-Qx5, PM6-Qx10, PM6-Qx15) into PM6 main chain. The introduced Qx is expected to lower the HOMO energy level, enhance quinoid resonance and strengthen intermolecular dipole interactions. The results confirm that all terpolymers achieve a lower-lying HOMO energy level, exhibited strong electrostatic potential and demonstrated excellent miscibility with the PY-DT. PM6-Qx10 has achieved the optimal balance between intramolecular and intermolecular interactions compared to PM6, forming a favorable fibrous network morphology for charge generation and transport, while simultaneously reducing non-radiative recombination. The PM6-Qx10:PY-DT device has achieved a high PCE of 19.10 %, with an extremely high <em>V</em>_OC of 0.986 V. Meanwhile, the <em>E</em>_loss is as low as 0.486 eV. Our study not only demonstrates an effective strategy for reducing <em>E</em>_loss in all-PSCs, optimizing active layer morphology, and simultaneously improving <em>V</em>_OC, <em>J</em>_SC and FF, but also provides valuable theoretical guidance for the molecular engineering principles of higher performance all-polymer photovoltaic cells.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101127"},"PeriodicalIF":31.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent advances in catalysts and interface engineering for high-performance proton exchange membrane water electrolyzers","authors":"Muhammad Arshad ,&nbsp;Akbar Bashir ,&nbsp;Haseebul Hassan ,&nbsp;Shuiping Luo ,&nbsp;Muhammad Bilal ,&nbsp;Muhammad Wasim ,&nbsp;Wen Chen ,&nbsp;Lei Xie ,&nbsp;Jing-Li Luo ,&nbsp;Xian-Zhu Fu","doi":"10.1016/j.mser.2025.101124","DOIUrl":"10.1016/j.mser.2025.101124","url":null,"abstract":"<div><div>Proton exchange membrane (PEM) water electrolysis has emerged as the most promising technology for sustainable hydrogen production, enabling the decarbonization of energy systems and hard-to-abate industrial sectors. This comprehensive review critically examines recent breakthroughs and persistent challenges across the entire PEMWE value chain, from advanced materials to system integration and large-scale deployment. We present a detailed analysis of cutting-edge developments in electrocatalysts, including atomically dispersed Ir/Ru oxides, high-entropy alloys, and non-precious metal alternatives that achieve superior activity and stability while reducing noble metal loadings to ≤ 0.1 mg cm⁻². This study systematically evaluates advanced membrane innovations, including ultrathin reinforced perfluorosulfonic acid (PFSA) and hydrocarbon-based alternatives, which achieve simultaneous high proton conductivity and exceptional mechanical durability. A special focus is placed on engineering solutions for porous transport layers and bipolar plates that address critical mass transport limitations at high current densities (≥ 3.0 A cm⁻²). Beyond component-level advances, we analyse system integration strategies, including dynamic operation (0–200 % rated power), hybrid renewable energy coupling, and high-pressure electrolysis (up to 100 bar), that enhance efficiency and economic viability. We provide a critical assessment of key technological barriers, including membrane degradation mechanisms, catalyst dissolution pathways, and the iridium supply chain crisis, while proposing mitigation strategies through advanced manufacturing and alternative approaches. By integrating fundamental research with industrial perspectives, we present a deployment roadmap that underscores the essential interplay of materials innovation, policy frameworks, and market mechanisms to unlock PEMWE’s potential for the global energy transition.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101124"},"PeriodicalIF":31.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advances in polysaccharide-based food packaging: Functionalization strategies and sustainability considerations","authors":"Hossein Baniasadi ,&nbsp;Roozbeh Abidnejad ,&nbsp;Mahyar Fazeli ,&nbsp;Jukka Niskanen ,&nbsp;Erlantz Lizundia","doi":"10.1016/j.mser.2025.101128","DOIUrl":"10.1016/j.mser.2025.101128","url":null,"abstract":"<div><div>The food packaging industry generates escalating environmental challenges due to the pervasive use of single-use petroleum-derived plastics, which contribute to climate change, pollution, and microplastic contamination. Polysaccharides have emerged as promising renewable alternatives for food packaging materials. This review critically evaluates recent advances regarding functionalization strategies aimed at improving the mechanical, barrier, and functional properties of polysaccharide-based packaging films. Special attention is paid to chemical modification, blending with bioactive agents, and incorporation of nanomaterials. These strategies significantly enhance the material properties and extend the functionality of polysaccharide-based films, such as antimicrobial, UV-blocking, and pH-indicating capabilities. Life cycle assessment (LCA) and material circularity considerations are provided to compare the environmental sustainability of polysaccharide-based packaging against conventional petroleum-derived plastics, highlighting the environmental trade-offs associated with the adoption of biopolymer-based materials. Additionally, the review critically examines the current limitations and challenges related to scaling up production and achieving cost-effectiveness, thus offering insights into the practical implementation of these materials in the food packaging industry. Finally, key research opportunities are identified, emphasizing the need for further studies to address the challenges of large-scale implementation and cost efficiency in the transition to more sustainable food packaging solutions.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101128"},"PeriodicalIF":31.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent progress in the synthesis, scaling, processing and technoeconomic analysis of metal-organic frameworks towards industrial applications","authors":"Zi Li ,&nbsp;Xinyu Yang ,&nbsp;Chuanzhi Ju ,&nbsp;Tian Tian ,&nbsp;Jingwei Hou ,&nbsp;Zhigang Hu ,&nbsp;Jianxin Zou","doi":"10.1016/j.mser.2025.101123","DOIUrl":"10.1016/j.mser.2025.101123","url":null,"abstract":"<div><div>Economical and efficient synthesis and processing technologies are essential for industrial-level applications of metal-organic frameworks (MOFs). To bridge the gap between lab-scale synthesis and commercial applications, we here provide a comprehensive and holistic review on the challenges of transitioning MOF materials from the laboratory agent to commercial products, and further to industrial-scale applications, with an emphasis on existing approaches and technologies for the large-scale synthesis and processing and technoeconomic feasibility of MOFs. We also pinpoint the fundamental principles on the metal-ligand reaction mechanism and elaborate on their impact on MOF synthesis and stability. In addition, novel synthesis mechanisms and processing methods and technologies are covered, such as electron-beam radiation method, melt-quench method, sol-gel method, liquid-phase sintering technology, monolithic technology, plasma/laser-assisted technology, etc. In particular, the importance of AI in the design, fabrication and processing of MOFs is highlignted in the current milieu of AI+materials paradigm. We thus aim to provide in-depth insights into the design and development of efficient and versatile synthetic and processing approaches and technologies to promote practical MOF-based applications in addressing the current global energy and environment challenges.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101123"},"PeriodicalIF":31.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unresolved controversies in perovskite-based antiferroelectrics: Fundamentals and frontiers","authors":"Tianfu Zhang ,&nbsp;Yangyang Si","doi":"10.1016/j.mser.2025.101121","DOIUrl":"10.1016/j.mser.2025.101121","url":null,"abstract":"<div><div>Antiferroelectrics have emerged as a critical material in condensed matter physics, holding transformative potential for next-generation technologies including high energy-density capacitor, electromechanical systems, and electric field-modulated thermal switching devices. Since the theoretical postulation of antiferroelectricity and the identification of PbZrO₃ as the first prototypical antiferroelectric, this field has evolved through seven decades of interdisciplinary research. Nevertheless, enduring ambiguities in fundamental principles continue to impede both theoretical comprehension and technological utilization. In this review, we revisit the intricate landscape of antiferroelectric fundamentals, examining prevailing debates and unresolved controversies. Moreover, we critically address the ambiguous definitions of antiferroelectricity, structural complexities, the elusive origins, and the intricate mechanisms underlying phase transitions. By integrating historical context with recent experimental and theoretical progress, this review aims to stimulate innovative solutions to long-standing questions, thereby bridging the gap between fundamental antiferroelectric phenomena and their practical applications in energy storage, electronic devices, and quantum technologies.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101121"},"PeriodicalIF":31.6,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ester-functionalized nonfullerene acceptors modulate crystallinity enabling 20% efficiency organic solar cells with scalability","authors":"Gengsui Tian ,&nbsp;Yao Chen ,&nbsp;Yaohui Li ,&nbsp;Lei Liu ,&nbsp;Qianyi Ma ,&nbsp;Shengnan Duan ,&nbsp;Chaisa Uragami ,&nbsp;Hideki Hashimoto ,&nbsp;Peihao Huang ,&nbsp;Chunming Yang ,&nbsp;Yang (Michael) Yang ,&nbsp;Shirong Lu ,&nbsp;Zeyun Xiao","doi":"10.1016/j.mser.2025.101118","DOIUrl":"10.1016/j.mser.2025.101118","url":null,"abstract":"<div><div>The strategic molecular design of non-fullerene acceptors (NFAs) is pivotal for enhancing the efficiency of organic solar cells (OSCs). Transitioning from high-efficiency small-area devices to large-area modules requires equally meticulous device engineering, yet this critical aspect is often overlooked. Here, we report two new NFAs (<strong>Pz-E2F</strong> and <strong>Pz-E2Cl</strong>) designed through an ester-functionalization strategy on the phenazine (Pz) core, a departure from conventional halogenation approaches and enhance the OSC performance from 0.1 cm² device (20.03 % efficiency) to 19.3 cm² modules (15.56 % efficiency). Theoretical and experimental analyses demonstrate that ester functionalization of the central Pz-core enhances electrostatic interactions, crystallinity, and donor-acceptor miscibility compared to the non-ester-functionalized <strong>Pz-2F</strong>, thus improving exciton dissociation efficiency, reducing exciton recombination rates, creating more balanced hole/electron mobility, and enhancing charge generation in OSC devices. This work provides a holistic solution for OSCs by bridging molecular design, nanoscale crystallization, device physics, and module engineering, addressing critical gaps between molecules and modules.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101118"},"PeriodicalIF":31.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photodegradable hydrogels: Connecting network evolution and material properties by a photo-chemo-mechanical coupling model","authors":"Feixiang Huang ,&nbsp;Binhong Liu ,&nbsp;Yujun Guo ,&nbsp;Zixu Yang ,&nbsp;Siming Li ,&nbsp;Zhe Chen ,&nbsp;Shaoxing Qu","doi":"10.1016/j.mser.2025.101116","DOIUrl":"10.1016/j.mser.2025.101116","url":null,"abstract":"<div><div>Degradable hydrogels possess excellent biocompatibility, controllable mechanical properties, and mass transfer capabilities, making them widely applicable in wound dressings, drug delivery, and tissue engineering. By incorporating photo-responsive components into the polymer network, degradable hydrogels can respond to precisely controlled light fields. However, mechanical modeling works on photodegradable hydrogels remain relatively limited. A finite deformation theory coupling photochemical principles is needed to comprehensively describe the mechanical behavior of photodegradable hydrogels. In this study, we developed a photo-chemo-mechanical coupling constitutive model of photodegradable hydrogels within the framework of continuum mechanics. The model involves the photochemical kinetics of the photo-induced degradation process and depicts the evolution of networks in the degradation process using sub-networks, providing a microscopic image more consistent with the degradation mechanism. The model characterizes the changes in mechanical properties and swelling deformation after photodegradation, and corresponding experimental validations are conducted. Building upon this theoretical model, specific recipe compositions and degradation conditions are systematically discussed, and the parameter-property relationships are bridged. This constitutive model reveals the photodegradation mechanism of the hydrogel network at the microscopic level and can predict mechanical behavior at the macroscopic level, guiding the synthesis and application of photodegradable hydrogels.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101116"},"PeriodicalIF":31.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scalable hard carbon production for sodium-ion batteries: Integrated precursor selection, thermochemical conversion, and tandem processing","authors":"Jian Yin ,&nbsp;Danfeng Li ,&nbsp;Chen Yang ,&nbsp;Hu Zhang ,&nbsp;Ruiyao Wu ,&nbsp;Rutong Yang ,&nbsp;Anjie Liu ,&nbsp;Feng Yu ,&nbsp;Jiao Yin ,&nbsp;Hui Zhu","doi":"10.1016/j.mser.2025.101094","DOIUrl":"10.1016/j.mser.2025.101094","url":null,"abstract":"<div><div>Sodium-ion battery has been widely regarded as a cost effective and scalable solution for short/medium-term energy storage, where hard carbon anode serves as a crucial role in determining the energy density and charging rate of full-cell device. To date, most studies have focused on the synthesis strategies and performance of hard carbons at laboratory scale, while few reports address the industrial production processes from the perspective of thermochemical transformation and carbon structure evolution. Herein, we evaluate research and development strategies of hard carbons from the viewpoint of processing operation and industrial production, mainly including precursor selection, pretreatment, carbonization, and post treatment. Notably, thermochemical transformation and engineering are highlighted as a key part to tailor carbon skeleton for Na-ion storage. Finally, challenges in large-scale production and future research directions are outlined for hard carbon enhancement and Na-ion full-cell development.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101094"},"PeriodicalIF":31.6,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tailoring cyano-functionalized covalent organic frameworks with highly ordered charge network structure for efficient hydrogen peroxide photosynthesis","authors":"Linjie Zhou ,&nbsp;Xiaoke Jia ,&nbsp;Yujie Wang ,&nbsp;Kun Xiong ,&nbsp;Jiani Yang ,&nbsp;Yuxuan Kong ,&nbsp;Mengchao Guo ,&nbsp;Xiaohui Xu ,&nbsp;Shuang Li ,&nbsp;Xiancheng Ren ,&nbsp;Chong Cheng","doi":"10.1016/j.mser.2025.101117","DOIUrl":"10.1016/j.mser.2025.101117","url":null,"abstract":"<div><div>As a vital industrial oxidant, H₂O₂ suffers from energy-intensive conventional production methods. Covalent organic frameworks (COFs) have emerged as promising photocatalysts for producing H₂O₂. Conventional imine-linked COFs suffer from inefficient charge separation due to electron localization at nitrogen atoms, which disrupts π-conjugation and promotes charge recombination. To overcome these limitations, we propose cyano-vinylene-linked COFs with precisely designed highly ordered charge networks as an alternative to conventional imine-linked frameworks. The vinyl bridges establish continuous π-conjugation pathways for charge separation, while the cyano groups guide directional electron transfer, collectively forming an efficient charge transport network. Density functional theory (DFT) calculations reveal that synergy between the π-conjugated backbone and cyano groups enhances electron mobility and facilitates electron injection into O₂, accelerating *OOH formation and oxygen reduction. Using benzotrithiophene-2,5,8-tricarboxaldehyde (BTT) as a key building block, we synthesized three distinct COF architectures: an imine-linked framework (Mph-2NH₂-COF) and two cyano-vinylene-linked variants (Bph-2CN-COF and Mph-2CN-COF). Experimentally, the optimized Mph-2CN-COF achieves a record H₂O₂ production rate of 9423.2 μmol g⁻¹ h⁻¹ under alkaline conditions, with stable performance over 8 h in a flow reactor, and completes benzylamine coupling in 90 min. These findings demonstrate that constructing highly ordered charge networks is an effective strategy for high-performance photocatalysis, enabling sustainable H₂O₂ production and organic synthesis.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101117"},"PeriodicalIF":31.6,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Towards intelligent defect detection in metal powder bed fusion: A review of in situ monitoring, data pre-processing, and machine learning","authors":"Pan Wang ,&nbsp;Zicheng Wu ,&nbsp;Jason Jyi Sheuan Ten,&nbsp;Jiazhao Huang,&nbsp;Mui Ling Sharon Nai","doi":"10.1016/j.mser.2025.101112","DOIUrl":"10.1016/j.mser.2025.101112","url":null,"abstract":"<div><div>Metal powder bed fusion (PBF) is a pivotal additive manufacturing (AM) technique for producing metallic parts. However, it is plagued by defects such as porosity, cracks, and warping, which compromise the quality of the final product. In response, there is a growing interest in leveraging <em>in situ</em> monitoring, data pre-processing, and machine learning (ML) techniques for defect detection and prediction in the metal PBF process. This review provides a comprehensive analysis of current advancements in these areas. Specifically, we highlight the emerging trend of data pre-processing that serves as a bridge between <em>in situ</em> monitoring and ML. By addressing challenges such as background noise, data loss, and large volumes of data, pre-processing of <em>in situ</em> monitoring data plays a crucial role in improving the accuracy of defect detection and prediction in the metal PBF process. We also discuss notable methodologies, technologies, and trends in the field, offering insights into the current challenges and potential prospects for advancing <em>in situ</em> monitoring, data pre-processing, and ML techniques for defect investigation in metal PBF printed components.</div></div>","PeriodicalId":386,"journal":{"name":"Materials Science and Engineering: R: Reports","volume":"167 ","pages":"Article 101112"},"PeriodicalIF":31.6,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}