Solid-state batteries have garnered attention due to their potentiality for increasing energy density and enhanced safety. One of the most promising solid electrolytes is garnet-type Li7La3Zr2O12 (LLZO) ceramic electrolyte because of its high conductivity and ease of manufacture in ambient air. The complex gas-liquid-solid sintering mechanism makes it difficult to prepare LLZO with excellent performance and high consistency. In this study, an in-situ Li2O-atmosphere assisted solvent-free route is developed for producing the LLZO ceramics. First, the lithium-rich additive Li6Zr2O7 (LiZO) is applied to in-situ supply Li2O atmosphere at grain boundaries, where its decomposition products (Li2ZrO3) build the bridge between the grain boundaries. Second, comparisons were studied between the effects of dry and wet routes on the crystallinity, surface contamination, and particle size of calcined powders and sintered ceramics. Third, by analyzing the grain boundary composition and the evolution of ceramic microstructure, the impacts of dry and wet routes and lithium-rich additive LiZO on the ceramic sintering process were studied in detail to elucidate the sintering behavior and mechanism. Lastly, exemplary Nb-doped LLZO pellets with 2 wt% LiZO additives sintered at 1,300 °C × 1 min deliver Li+ conductivities of 8.39 × 10-4 S cm-1 at 25 °C, relative densities of 96.8%, and ultra-high consistency. It is believed that our route sheds light on preparing high-performance LLZO ceramics for solid-state batteries.
固态电池具有提高能量密度和安全性的潜力，因此备受关注。石榴石型 Li7La3Zr2O12（LLZO）陶瓷电解质是最有前途的固体电解质之一，因为它具有高导电性，而且易于在环境空气中制造。由于气-液-固烧结机理复杂，因此很难制备出性能优异、一致性高的 LLZO。本研究开发了一种原位 Li2O-大气辅助无溶剂路线来制备 LLZO 陶瓷。首先，应用富锂添加剂 Li6Zr2O7（LiZO）在晶界原位提供 Li2O 气氛，其分解产物（Li2ZrO3）在晶界之间架起桥梁。其次，比较了干法和湿法工艺对煅烧粉末和烧结陶瓷的结晶度、表面污染和粒度的影响。第三，通过分析晶界组成和陶瓷微观结构的演变，详细研究了干法和湿法工艺以及富锂添加剂 LiZO 对陶瓷烧结过程的影响，以阐明烧结行为和机制。最后，在 1,300 °C × 1 min 条件下烧结的掺有 2 wt% LiZO 添加剂的示例性掺铌 LLZO 粒子在 25 °C 时的锂+电导率为 8.39 × 10-4 S cm-1，相对密度为 96.8%，并且具有超高的一致性。相信我们的方法为制备固态电池用高性能 LLZO 陶瓷提供了启示。
{"title":"In-situ Li2O-atmosphere assisted solvent-free route to produce highly conductive Li7La3Zr2O12 solid electrolyte","authors":"Jiawen Tang, Yongjiang Zhou, Xiaoyi Li, Xiao Huang, Wei Tang, Bingbing Tian","doi":"10.20517/energymater.2023.87","DOIUrl":"https://doi.org/10.20517/energymater.2023.87","url":null,"abstract":"Solid-state batteries have garnered attention due to their potentiality for increasing energy density and enhanced safety. One of the most promising solid electrolytes is garnet-type Li7La3Zr2O12 (LLZO) ceramic electrolyte because of its high conductivity and ease of manufacture in ambient air. The complex gas-liquid-solid sintering mechanism makes it difficult to prepare LLZO with excellent performance and high consistency. In this study, an in-situ Li2O-atmosphere assisted solvent-free route is developed for producing the LLZO ceramics. First, the lithium-rich additive Li6Zr2O7 (LiZO) is applied to in-situ supply Li2O atmosphere at grain boundaries, where its decomposition products (Li2ZrO3) build the bridge between the grain boundaries. Second, comparisons were studied between the effects of dry and wet routes on the crystallinity, surface contamination, and particle size of calcined powders and sintered ceramics. Third, by analyzing the grain boundary composition and the evolution of ceramic microstructure, the impacts of dry and wet routes and lithium-rich additive LiZO on the ceramic sintering process were studied in detail to elucidate the sintering behavior and mechanism. Lastly, exemplary Nb-doped LLZO pellets with 2 wt% LiZO additives sintered at 1,300 °C × 1 min deliver Li+ conductivities of 8.39 × 10-4 S cm-1 at 25 °C, relative densities of 96.8%, and ultra-high consistency. It is believed that our route sheds light on preparing high-performance LLZO ceramics for solid-state batteries.","PeriodicalId":516209,"journal":{"name":"Energy Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140232747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-15DOI: 10.20517/energymater.2023.67
Jinuk Choi, Sejin Im, Jihyun Choi, S. Surendran, Dae Jun Moon, Joonyoung Kim, Jung Kyu Kim, U. Sim
Ammonia has been used in a wide variety of applications, and with the recent interest in hydrogen energy as a green energy source, it is emerging as a cost-effective, high-density hydrogen carrier due to its three hydrogen atoms. Currently, ammonia is produced by the Haber-Bosch method at high temperatures and pressure, which is energy-intensive and emits large amounts of carbon dioxide. As a viable alternative, the electrochemical conversion of nitrate to ammonia has emerged as an efficient and eco-friendly synthesis method. To encourage further exploration in this field, this review offers insights into utilizing two-dimensional materials as electrochemical catalysts, focusing on designs that exploit defects for nitrate reduction to ammonia.
{"title":"Recent advances in 2D structured materials with defect-exploiting design strategies for electrocatalysis of nitrate to ammonia","authors":"Jinuk Choi, Sejin Im, Jihyun Choi, S. Surendran, Dae Jun Moon, Joonyoung Kim, Jung Kyu Kim, U. Sim","doi":"10.20517/energymater.2023.67","DOIUrl":"https://doi.org/10.20517/energymater.2023.67","url":null,"abstract":"Ammonia has been used in a wide variety of applications, and with the recent interest in hydrogen energy as a green energy source, it is emerging as a cost-effective, high-density hydrogen carrier due to its three hydrogen atoms. Currently, ammonia is produced by the Haber-Bosch method at high temperatures and pressure, which is energy-intensive and emits large amounts of carbon dioxide. As a viable alternative, the electrochemical conversion of nitrate to ammonia has emerged as an efficient and eco-friendly synthesis method. To encourage further exploration in this field, this review offers insights into utilizing two-dimensional materials as electrochemical catalysts, focusing on designs that exploit defects for nitrate reduction to ammonia.","PeriodicalId":516209,"journal":{"name":"Energy Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140238126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-15DOI: 10.20517/energymater.2023.74
Satheesh kumar Balu, Sijie Cheng, S. S. Latthe, Ruimin Xing, Shanhu Liu
Solar-driven interfacial evaporation (SIE) is an emerging research topic that is gaining attention due to its potential in addressing global water scarcity issues. This review provides a comprehensive overview of base materials, recent innovations in photothermal materials and the design of evaporators for effective water desalination and purification. The recent development of SIE is meticulously discussed, providing a deep understanding of the key performance indicators and state-of-the-art materials. Additionally, this review examines novel strategies that have been reported in the literature for enhancing the efficiency and scalability of SIE systems. These strategies involve using photothermal materials and exploring innovative device configurations. Finally, we discuss the existing challenges and future research directions, emphasizing the potential of SIE in addressing global water scarcity and contributing to a sustainable future.
太阳能驱动界面蒸发（SIE）是一个新兴的研究课题，因其在解决全球水资源短缺问题方面的潜力而备受关注。本综述全面概述了基础材料、光热材料的最新创新以及有效脱盐和净化水的蒸发器设计。本综述详尽讨论了 SIE 的最新发展，让读者深入了解其关键性能指标和最先进的材料。此外，本综述还研究了文献中报道的提高 SIE 系统效率和可扩展性的新策略。这些策略包括使用光热材料和探索创新的设备配置。最后，我们讨论了现有的挑战和未来的研究方向，强调了 SIE 在解决全球缺水问题和促进可持续未来发展方面的潜力。
{"title":"Solar-driven interfacial evaporation: materials design and device assembly","authors":"Satheesh kumar Balu, Sijie Cheng, S. S. Latthe, Ruimin Xing, Shanhu Liu","doi":"10.20517/energymater.2023.74","DOIUrl":"https://doi.org/10.20517/energymater.2023.74","url":null,"abstract":"Solar-driven interfacial evaporation (SIE) is an emerging research topic that is gaining attention due to its potential in addressing global water scarcity issues. This review provides a comprehensive overview of base materials, recent innovations in photothermal materials and the design of evaporators for effective water desalination and purification. The recent development of SIE is meticulously discussed, providing a deep understanding of the key performance indicators and state-of-the-art materials. Additionally, this review examines novel strategies that have been reported in the literature for enhancing the efficiency and scalability of SIE systems. These strategies involve using photothermal materials and exploring innovative device configurations. Finally, we discuss the existing challenges and future research directions, emphasizing the potential of SIE in addressing global water scarcity and contributing to a sustainable future.","PeriodicalId":516209,"journal":{"name":"Energy Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140241247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rising atmospheric CO2 concentrations urgently call for advanced sustainable energy storage solutions, underlining the pivotal role of renewable energies. This perspective delves into the capabilities of redox flow batteries as potential grid storage contenders, highlighting their benefits over traditional lithium-ion batteries. While all-vanadium flow batteries have established themselves, concerns about vanadium availability have steered interest toward Organic Flow Batteries. The multifaceted nature of organic materials calls for an integrated approach combining artificial intelligence, robotics, and material science to enhance battery efficacy. The union of artificial intelligence and robotics expedites the research and development trajectory, encompassing everything from data assimilation to continuous refinement. With the burgeoning metaverse, a groundbreaking avenue for collaborative research emerges, potentially revolutionizing flow battery research and catalyzing the progression towards sustainable energy resolutions.
{"title":"Digitization of flow battery experimental process research and development","authors":"Changyu Chen, Gaole Dai, Yuechen Gao, Peizhe Xu, Wei He, Shunan Feng, Xi Zhu, Yu Zhao","doi":"10.20517/energymater.2023.91","DOIUrl":"https://doi.org/10.20517/energymater.2023.91","url":null,"abstract":"Rising atmospheric CO2 concentrations urgently call for advanced sustainable energy storage solutions, underlining the pivotal role of renewable energies. This perspective delves into the capabilities of redox flow batteries as potential grid storage contenders, highlighting their benefits over traditional lithium-ion batteries. While all-vanadium flow batteries have established themselves, concerns about vanadium availability have steered interest toward Organic Flow Batteries. The multifaceted nature of organic materials calls for an integrated approach combining artificial intelligence, robotics, and material science to enhance battery efficacy. The union of artificial intelligence and robotics expedites the research and development trajectory, encompassing everything from data assimilation to continuous refinement. With the burgeoning metaverse, a groundbreaking avenue for collaborative research emerges, potentially revolutionizing flow battery research and catalyzing the progression towards sustainable energy resolutions.","PeriodicalId":516209,"journal":{"name":"Energy Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140243924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-12DOI: 10.20517/energymater.2023.84
G. Maresca, Abinaya Sankaran, L. J. Santa Maria, Michela Ottaviani, S. Fantini, Kevin M. Ryan, Sergio Brutti, G. Appetecchi
Silicon nanowire anodes were investigated in lithium-metal cells using different electrolyte formulations based on 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide and N -trimethyl-N -butyl-ammonium bis(fluoro sulfonyl)imide ionic liquids. The lithium insertion process in the silicon anode was analyzed by cyclic voltammetry measurements, performed at different scan rates and for prolonged cycles, combined with impedance spectroscopy analysis. A galvanostatic charge-discharge cycling test was performed to analyze the electrochemical performances using different types of ionic liquids. A study of the Solid Electrolyte Interphase layer on the silicon nanowire electrode surface was carried out through X-ray photoelectron spectroscopy. In general, the silicon anodes in 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide-based electrolytes show very good reversibility, reproducibility, and efficiency in the lithiation process, even at high scan rates, and exhibit a reversible capacity exceeding 1,000 mA h g-1 after 2,000 charge-discharge cycles, corresponding to 46% of the initial value.
研究人员使用基于 1-乙基-3-甲基咪唑鎓双(三氟甲基磺酰基)亚胺、1-乙基-3-甲基咪唑鎓双(氟磺酰基)亚胺和 N-三甲基-N-丁基铵双(氟磺酰基)亚胺离子液体的不同电解质配方，对锂金属电池中的硅纳米线阳极进行了研究。通过不同扫描速率和长时间循环的循环伏安测量，结合阻抗光谱分析，对硅阳极的锂插入过程进行了分析。为了分析使用不同类型离子液体的电化学性能，还进行了电静态充放电循环测试。通过 X 射线光电子能谱对硅纳米线电极表面的固体电解质相间层进行了研究。总的来说，在 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide 基电解质中的硅阳极在锂化过程中表现出非常好的可逆性、可重复性和效率，即使在高扫描速率下也是如此，并且在充放电循环 2,000 次后表现出超过 1,000 mA h g-1 的可逆容量，相当于初始值的 46%。
{"title":"Superior compatibility of silicon nanowire anodes in ionic liquid electrolytes","authors":"G. Maresca, Abinaya Sankaran, L. J. Santa Maria, Michela Ottaviani, S. Fantini, Kevin M. Ryan, Sergio Brutti, G. Appetecchi","doi":"10.20517/energymater.2023.84","DOIUrl":"https://doi.org/10.20517/energymater.2023.84","url":null,"abstract":"Silicon nanowire anodes were investigated in lithium-metal cells using different electrolyte formulations based on 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide and N -trimethyl-N -butyl-ammonium bis(fluoro sulfonyl)imide ionic liquids. The lithium insertion process in the silicon anode was analyzed by cyclic voltammetry measurements, performed at different scan rates and for prolonged cycles, combined with impedance spectroscopy analysis. A galvanostatic charge-discharge cycling test was performed to analyze the electrochemical performances using different types of ionic liquids. A study of the Solid Electrolyte Interphase layer on the silicon nanowire electrode surface was carried out through X-ray photoelectron spectroscopy. In general, the silicon anodes in 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide-based electrolytes show very good reversibility, reproducibility, and efficiency in the lithiation process, even at high scan rates, and exhibit a reversible capacity exceeding 1,000 mA h g-1 after 2,000 charge-discharge cycles, corresponding to 46% of the initial value.","PeriodicalId":516209,"journal":{"name":"Energy Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140249259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-12DOI: 10.20517/energymater.2023.81
G. Saeed, T. Kang, Jin Suk Byun, D. Min, Jun Su Kim, S. Sadavar, H. Park
Two-dimensional (2D) materials display a unique set of physical/chemical properties and are considered potential building blocks for the manufacturing of microstructured materials for a number of applications. Prominent applications range from advanced electronics to miniaturized electrochemical energy storage devices (EESDs). Herein, we present a comprehensive and critical review of the recent developments in design and microfabrication of 2D-driven microscale electrodes for three-dimensional (3D)-printed micro-supercapacitors and micro-batteries. Firstly, we systematically discuss the advantages and disadvantages associated with various microfabrication techniques such as stereolithography, fused deposition modeling, inkjet printing, and direct ink writing. Next, key parameters disclosing the relationship between the characteristics of 2D-based materials and extrusion-driven 3D printing process for the development of versatile and sustainable EESDs are highlighted. 2D materials utilized for the construction of microelectrodes for supercapacitors (e.g., electric double layer capacitors (EDLCs), pseudocapacitors, and hybrid capacitors) and batteries (e.g., Li-based systems and next-generation systems, e.g., sodium-ion batteries and zinc-ion batteries) along with their prominent electrochemical contributions in relation to obtained 3D-printed architectures are discussed in detail. To promote the development of 2D materials-driven high-performance microscale EESDs, the relevant challenges and future research opportunities are also addressed.
{"title":"Two-dimensional (2D) materials for 3D printed micro-supercapacitors and micro-batteries","authors":"G. Saeed, T. Kang, Jin Suk Byun, D. Min, Jun Su Kim, S. Sadavar, H. Park","doi":"10.20517/energymater.2023.81","DOIUrl":"https://doi.org/10.20517/energymater.2023.81","url":null,"abstract":"Two-dimensional (2D) materials display a unique set of physical/chemical properties and are considered potential building blocks for the manufacturing of microstructured materials for a number of applications. Prominent applications range from advanced electronics to miniaturized electrochemical energy storage devices (EESDs). Herein, we present a comprehensive and critical review of the recent developments in design and microfabrication of 2D-driven microscale electrodes for three-dimensional (3D)-printed micro-supercapacitors and micro-batteries. Firstly, we systematically discuss the advantages and disadvantages associated with various microfabrication techniques such as stereolithography, fused deposition modeling, inkjet printing, and direct ink writing. Next, key parameters disclosing the relationship between the characteristics of 2D-based materials and extrusion-driven 3D printing process for the development of versatile and sustainable EESDs are highlighted. 2D materials utilized for the construction of microelectrodes for supercapacitors (e.g., electric double layer capacitors (EDLCs), pseudocapacitors, and hybrid capacitors) and batteries (e.g., Li-based systems and next-generation systems, e.g., sodium-ion batteries and zinc-ion batteries) along with their prominent electrochemical contributions in relation to obtained 3D-printed architectures are discussed in detail. To promote the development of 2D materials-driven high-performance microscale EESDs, the relevant challenges and future research opportunities are also addressed.","PeriodicalId":516209,"journal":{"name":"Energy Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140250800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-21DOI: 10.20517/energymater.2023.75
H. Wu, Shenghao Luo, Wen Zheng, Li Li, Yaobing Fang, Wenhui Yuan
Dual-ion batteries (DIBs) have attracted extensive attention and investigations due to their inherent wide operating voltage and environmental friendliness. Nevertheless, the vast majority of DIBs employ metal-based anode active materials or electrolytes, which are relatively costly and unsustainable. Moreover, the utilization of binders and current collectors in the preparation of cathodes and anodes reduces the energy density to a certain extent, which weakens the advantages of DIBs. Here, we synthesized three types of binder-free nano-embroidered spherical polyimide anode materials composed entirely of renewable elements, paired with pure ionic liquid electrolyte without metal elements and flexible self-supporting independent graphite paper cathode without current collector, to construct a class of totally metal and binder-free DIBs. It significantly improves specific discharge capacity, energy density, cyclic stability, and fast charging performance while remarkably reducing costs and self-discharge rate. Additionally, we overcame the drawbacks of conventional synthesis methods and innovatively prepared nanoscale polyimide materials by a green and facile hydrothermal method, which effectively minimizes synthesis costs and avoids risks. This novel battery system design strategy will promote the advancement of low-cost, high-performance DIBs and could be a promising candidate for large-scale energy storage applications.
{"title":"Metal- and binder-free dual-ion battery based on green synthetic nano-embroidered spherical organic anode and pure ionic liquid electrolyte","authors":"H. Wu, Shenghao Luo, Wen Zheng, Li Li, Yaobing Fang, Wenhui Yuan","doi":"10.20517/energymater.2023.75","DOIUrl":"https://doi.org/10.20517/energymater.2023.75","url":null,"abstract":"Dual-ion batteries (DIBs) have attracted extensive attention and investigations due to their inherent wide operating voltage and environmental friendliness. Nevertheless, the vast majority of DIBs employ metal-based anode active materials or electrolytes, which are relatively costly and unsustainable. Moreover, the utilization of binders and current collectors in the preparation of cathodes and anodes reduces the energy density to a certain extent, which weakens the advantages of DIBs. Here, we synthesized three types of binder-free nano-embroidered spherical polyimide anode materials composed entirely of renewable elements, paired with pure ionic liquid electrolyte without metal elements and flexible self-supporting independent graphite paper cathode without current collector, to construct a class of totally metal and binder-free DIBs. It significantly improves specific discharge capacity, energy density, cyclic stability, and fast charging performance while remarkably reducing costs and self-discharge rate. Additionally, we overcame the drawbacks of conventional synthesis methods and innovatively prepared nanoscale polyimide materials by a green and facile hydrothermal method, which effectively minimizes synthesis costs and avoids risks. This novel battery system design strategy will promote the advancement of low-cost, high-performance DIBs and could be a promising candidate for large-scale energy storage applications.","PeriodicalId":516209,"journal":{"name":"Energy Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139957883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-21DOI: 10.20517/energymater.2023.76
Yahao Du, Yuhong Liu, Fei-Fei Cao, Huan Ye
Although lithium-sulfur (Li-S) batteries have a high theoretical energy density, their practical applications are limited by rapid capacity fading and poor cycling stability due to the dissolution of high-order polysulfides in electrolytes and the sluggish kinetics of the solid-state Li2S2/Li2S redox reaction. Herein, a polysulfide sorbent and redox reaction catalytic promoter, Au quantum dots (Au QDs)-decorated MXene nanosheet, is designed by proposing defect-induced-reduced Ti3C2Tx (MXene) to improve the performance of Li-S batteries. The polar surface functional groups and high electronic conductivity of the MXene boost the conversion of sulfur/polysulfides and restrict the dissolution of the polysulfide shuttle. The Au QDs catalyst reduces the conversion reaction activation energy to achieve rapid solid-state Li2S2/Li2S reaction kinetics. Due to the adsorption-catalysis synergistic effect between MXene and Au QDs, an initial discharge capacity of 1,500 mA h g-1 is obtained, corresponding to a sulfur utilization of 90%. A Li-S battery based on the Au QDs@MXene-decorated separator exhibits a capacity retention rate of 71.0% for 300 cycles at 1 C.
虽然锂硫（Li-S）电池具有很高的理论能量密度，但由于高阶多硫化物在电解质中的溶解以及固态 Li2S2/Li2S 氧化还原反应的缓慢动力学，其实际应用受到容量快速衰减和循环稳定性差的限制。本文通过提出缺陷诱导还原的 Ti3C2Tx（MXene），设计了一种多硫化物吸附剂和氧化还原反应催化促进剂--金量子点（Au QDs）装饰的 MXene 纳米片，以改善锂-S 电池的性能。MXene 的极性表面官能团和高电子传导性促进了硫/多硫化物的转化，并限制了多硫穿梭体的溶解。金 QDs 催化剂降低了转化反应的活化能，从而实现了快速的固态 Li2S2/Li2S 反应动力学。由于 MXene 和 Au QDs 之间的吸附催化协同效应，可获得 1,500 mA h g-1 的初始放电容量，相当于 90% 的硫利用率。基于金 QDs@MXene 装饰隔膜的锂-S 电池在 1 C 下循环 300 次，容量保持率为 71.0%。
{"title":"Defect-induced-reduced Au quantum Dots@MXene decorated separator enables lithium-sulfur batteries with high sulfur utilization","authors":"Yahao Du, Yuhong Liu, Fei-Fei Cao, Huan Ye","doi":"10.20517/energymater.2023.76","DOIUrl":"https://doi.org/10.20517/energymater.2023.76","url":null,"abstract":"Although lithium-sulfur (Li-S) batteries have a high theoretical energy density, their practical applications are limited by rapid capacity fading and poor cycling stability due to the dissolution of high-order polysulfides in electrolytes and the sluggish kinetics of the solid-state Li2S2/Li2S redox reaction. Herein, a polysulfide sorbent and redox reaction catalytic promoter, Au quantum dots (Au QDs)-decorated MXene nanosheet, is designed by proposing defect-induced-reduced Ti3C2Tx (MXene) to improve the performance of Li-S batteries. The polar surface functional groups and high electronic conductivity of the MXene boost the conversion of sulfur/polysulfides and restrict the dissolution of the polysulfide shuttle. The Au QDs catalyst reduces the conversion reaction activation energy to achieve rapid solid-state Li2S2/Li2S reaction kinetics. Due to the adsorption-catalysis synergistic effect between MXene and Au QDs, an initial discharge capacity of 1,500 mA h g-1 is obtained, corresponding to a sulfur utilization of 90%. A Li-S battery based on the Au QDs@MXene-decorated separator exhibits a capacity retention rate of 71.0% for 300 cycles at 1 C.","PeriodicalId":516209,"journal":{"name":"Energy Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139958034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-19DOI: 10.20517/energymater.2023.72
Jin Hyuk Cho, Youngho Kim, Hak Ki Yu, Soo Young Kim
Humanity is confronting significant environmental issues due to rising energy demands and the unchecked use of fossil fuels. Thus, the strategic employment of sustainable and environmentally friendly energy sources is becoming increasingly vital. Additionally, addressing challenges, such as low reactivity, suboptimal energy efficiency, and restricted selectivity, requires the development of innovative catalysts. Two-dimensional (2D) covalent organic frameworks (COFs), known for their limitless structural versatility, are proving to be important materials in energy conversion applications. The exceptional properties of 2D COFs, including an organized arrangement resulting in well-defined active sites and π-π stacking interactions, enable breakthroughs in sustainable energy conversion applications. In this study, we comprehensively investigate universal synthesis methods and specific techniques, such as membrane-based deposition, liquid-phase intercalation, and polymerization. Furthermore, we demonstrate energy-conversion applications of 2D COFs as eco-friendly catalysts for electrochemical processes to promote sustainability and scalability by utilizing them in the hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, and carbon dioxide reduction reaction. Additionally, we will explore methods for analyzing the physicochemical properties of precisely fabricated 2D COFs. Despite extensive research pertaining to 2D COFs, their practical industrial applications remain limited. Therefore, we propose various perspectives, including enhancing performance, improving synthesis methods, developing binder-free catalysts, expanding catalyst functionality, and advancing full-cell research, to achieve complete industrialization by leveraging their potential.
{"title":"Advancements in two-dimensional covalent organic framework nanosheets for electrocatalytic energy conversion: current and future prospects","authors":"Jin Hyuk Cho, Youngho Kim, Hak Ki Yu, Soo Young Kim","doi":"10.20517/energymater.2023.72","DOIUrl":"https://doi.org/10.20517/energymater.2023.72","url":null,"abstract":"Humanity is confronting significant environmental issues due to rising energy demands and the unchecked use of fossil fuels. Thus, the strategic employment of sustainable and environmentally friendly energy sources is becoming increasingly vital. Additionally, addressing challenges, such as low reactivity, suboptimal energy efficiency, and restricted selectivity, requires the development of innovative catalysts. Two-dimensional (2D) covalent organic frameworks (COFs), known for their limitless structural versatility, are proving to be important materials in energy conversion applications. The exceptional properties of 2D COFs, including an organized arrangement resulting in well-defined active sites and π-π stacking interactions, enable breakthroughs in sustainable energy conversion applications. In this study, we comprehensively investigate universal synthesis methods and specific techniques, such as membrane-based deposition, liquid-phase intercalation, and polymerization. Furthermore, we demonstrate energy-conversion applications of 2D COFs as eco-friendly catalysts for electrochemical processes to promote sustainability and scalability by utilizing them in the hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, and carbon dioxide reduction reaction. Additionally, we will explore methods for analyzing the physicochemical properties of precisely fabricated 2D COFs. Despite extensive research pertaining to 2D COFs, their practical industrial applications remain limited. Therefore, we propose various perspectives, including enhancing performance, improving synthesis methods, developing binder-free catalysts, expanding catalyst functionality, and advancing full-cell research, to achieve complete industrialization by leveraging their potential.","PeriodicalId":516209,"journal":{"name":"Energy Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140450518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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