Journal of the American Ceramic Society最新文献

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Complexant-facilitated assembly of NiTiO3 nanoparticles into microbars for high-performance lithium-ion battery anode 络合剂促进将 NiTiO3 纳米颗粒组装成用于高性能锂离子电池负极的微棒
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-17 DOI: 10.1111/jace.20068
Meng Sun, Xiaoli Sheng, Zhipeng Cui, Sijie Li, Qingye Zhang, Fei Xie, Guanting Liu, Shujin Hao, Feiyu Diao, Shiduo Sun, Yiqian Wang
{"title":"Complexant-facilitated assembly of NiTiO3 nanoparticles into microbars for high-performance lithium-ion battery anode","authors":"Meng Sun,&nbsp;Xiaoli Sheng,&nbsp;Zhipeng Cui,&nbsp;Sijie Li,&nbsp;Qingye Zhang,&nbsp;Fei Xie,&nbsp;Guanting Liu,&nbsp;Shujin Hao,&nbsp;Feiyu Diao,&nbsp;Shiduo Sun,&nbsp;Yiqian Wang","doi":"10.1111/jace.20068","DOIUrl":"10.1111/jace.20068","url":null,"abstract":"<p>Nickel titanate (NiTiO<sub>3</sub>) nanostructured materials have gained extensive attention in the field of lithium-ion batteries (LIBs) due to their high theoretical capacity and low cost. However, NiTiO<sub>3</sub> exhibits low conductivity and significant volume changes during cycling, resulting in capacity decay and poor cycling stability. Herein, we propose a feasible strategy to enhance the cycling performance of NiTiO<sub>3</sub> nanostructures by adjusting their morphology. By manipulating the choice of solvent employed in the synthetic process, we obtain NiTiO<sub>3</sub> microbars (NTO MBs) through self-assembly of NiTiO<sub>3</sub> nanoparticles (NTO NPs). When utilized as an anode material in LIBs, NTO MBs exhibit a capacity of 410 mAh g<sup>−1</sup> after 200 cycles at 100 mA g<sup>−1</sup>, surpassing that of NTO NPs (212 mAh g<sup>−1</sup>). The improved performance of NTO MBs is attributed to their unique porous bar-like structure, composed of numerous NPs, which provides a substantial storage space for Li<sup>+</sup> ions owing to its larger specific surface area. Additionally, the porous structure accelerates the diffusion of Li<sup>+</sup> ions and electron transfer. To gain a profound understanding of the enhanced performance through morphology adjustment, we conduct a comprehensive investigation on the growth mechanism of NTO MBs. This work provides valuable insights into the mechanism governing the morphology control of NTO MBs, facilitating the rational design and synthesis of tailored materials with enhanced performance for LIBs.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8650-8660"},"PeriodicalIF":3.5,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of high-sulfur fly ash on the microstructure and properties of magnesium phosphate cement 高硫粉煤灰对磷酸镁水泥微观结构和性能的影响
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-16 DOI: 10.1111/jace.20064
Jiaheng Du, Weiwei Sun, Yujie Xin, Rui Tao, Xiaoxia Hu, Pan Wang, Dongshuai Hou
{"title":"Influence of high-sulfur fly ash on the microstructure and properties of magnesium phosphate cement","authors":"Jiaheng Du,&nbsp;Weiwei Sun,&nbsp;Yujie Xin,&nbsp;Rui Tao,&nbsp;Xiaoxia Hu,&nbsp;Pan Wang,&nbsp;Dongshuai Hou","doi":"10.1111/jace.20064","DOIUrl":"10.1111/jace.20064","url":null,"abstract":"<p>Using fly ash (FA) to modify magnesium phosphate cement (MPC) not only extends setting time and enhances MPC performance but also reduces costs. Currently, high-quality FA is predominantly used, whereas the accumulation of low-quality FA poses challenges for waste management and environmental protection. This study focuses on low-quality FA with excessive sulfur content. Initially, X-ray fluorescence spectroscopy was employed to select two types of FA with SO<sub>3</sub> contents of 1.06% and 6.07%. FA replaced magnesium oxide in equal mass to prepare FA/MPC composite cementitious materials. The composite materials were studied for hydration heat, phase composition, infrared spectroscopy, mechanical properties, and microscopic morphology to explore SO<sub>3</sub>’s impact on MPC hydration processes, microstructure, and properties. The findings indicate that adding FA effectively dilutes reactants, extending setting time from 7 to 17 min and 18 min, aiding construction operations. In the FA/MPC composite cementitious materials, MPC hydration, along with FA's synergistic hydration, forms a new hydration product MgSiO<sub>3</sub>, improving material density and mechanical strength post-hardening. Excessive SO<sub>3</sub> in high-sulfur FA accelerates MgO decomposition, providing ample Mg<sup>2+</sup> for K-struvite synthesis, promoting MPC hydration, and transforming K-struvite from amorphous to crystalline, enhancing material strength.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8426-8441"},"PeriodicalIF":3.5,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Matrix compositions and their impact on grain growth and strength of oxide ceramic composites 基体成分及其对氧化物陶瓷复合材料晶粒生长和强度的影响
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-16 DOI: 10.1111/jace.20069
Renato S. M. Almeida, Marcelo B. R. Rech, Jéssica Condi Mainardi, Kamen Tushtev, Kurosch Rezwan
{"title":"Matrix compositions and their impact on grain growth and strength of oxide ceramic composites","authors":"Renato S. M. Almeida,&nbsp;Marcelo B. R. Rech,&nbsp;Jéssica Condi Mainardi,&nbsp;Kamen Tushtev,&nbsp;Kurosch Rezwan","doi":"10.1111/jace.20069","DOIUrl":"10.1111/jace.20069","url":null,"abstract":"<p>Oxide ceramic matrix composites (Ox-CMCs) are composed of porous matrices reinforced by dense fibers to achieve high damage tolerance. It is generally assumed that their mechanical properties are fiber dominant. However, fiber strength can also be influenced by the surrounding matrix as it can affect fiber grain growth. Fiber–matrix interactions are studied in this work regarding fiber microstructural evolution and composite strength. Minicomposites containing Nextel 610 fibers and different matrix compositions (alumina, alumina–zirconia, and mullite–alumina) are evaluated after sintering and after additional heat treatment at 1200°C for 100 h. Fiber grain growth during sintering is faster in alumina matrix and slower in mullite–alumina matrix. Scanning transmission electron microscope–energy-dispersive X-ray spectroscopy (STEM–EDX) measurements show that Si diffuses between fiber and matrix grain boundaries. This outward or inward diffusion of SiO<sub>2</sub> leads to the respectively different grain growth kinetics. Grain growth inhibition in alumina–zirconia matrix is only observed after the longer heat treatment, suggesting that ZrO<sub>2</sub> diffusion is slower than SiO<sub>2</sub>. The resultant composite strength depends not only on fiber properties, but also on matrix densification. Minicomposite with alumina–zirconia matrix showed higher strength, while mullite–alumina composites showed higher thermal stability. In summary, the properties of Ox-CMCs can be tailored by adjusting the matrix composition with the used fibers.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8442-8458"},"PeriodicalIF":3.5,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20069","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ba2LuNbO6:Er3+,Yb3+ up-conversion phosphors for dual-mode thermometry based on fluorescence intensity ratio 基于荧光强度比的 Ba2LuNbO6:Er3+,Yb3+上转换荧光粉用于双模温度测量法
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-12 DOI: 10.1111/jace.20058
Yang Chen, Junyu Chen, Yuxuan Luo, Qiang Wang, Hai Guo
{"title":"Ba2LuNbO6:Er3+,Yb3+ up-conversion phosphors for dual-mode thermometry based on fluorescence intensity ratio","authors":"Yang Chen,&nbsp;Junyu Chen,&nbsp;Yuxuan Luo,&nbsp;Qiang Wang,&nbsp;Hai Guo","doi":"10.1111/jace.20058","DOIUrl":"10.1111/jace.20058","url":null,"abstract":"<p>Fluorescence intensity ratio (FIR) thermometry has been regarded as new optical thermometry because of its faster response, higher sensitivity, and accuracy. However, improving the sensitivity is still a challenge. Here, Ba<sub>2</sub>LuNbO<sub>6</sub>:Er<sup>3+</sup>,Yb<sup>3+</sup> up-conversion specimens were synthesized, characterized, and designed for dual-mode thermometry based on FIR. The <sup>2</sup>H<sub>11/2</sub>/<sup>4</sup>S<sub>3/2</sub> thermally coupled energy levels (TCELs) and <sup>2</sup>H<sub>11/2</sub>/<sup>4</sup>F<sub>9/2</sub> non-TCELs (NTCELs) of Er<sup>3+</sup> were selected as two FIR modes for optical thermometry. The energy gap of <sup>2</sup>H<sub>11/2</sub>/<sup>4</sup>S<sub>3/2</sub> TCELs of Er<sup>3+</sup> in Ba<sub>2</sub>LuNbO<sub>6</sub>:Er<sup>3+</sup>,Yb<sup>3+</sup> phosphors was confirmed as 977 cm<sup>−1</sup>. Therefore, the maximal relative sensitivity (<i>S</i><sub>r</sub>) of FIR based on TCELs is 1.53% K<sup>−1</sup> @ 303 K. For FIR based on NTCELs, a higher maximal <i>S</i><sub>r</sub> value of 1.81% K<sup>−1</sup> @ 303 K is obtained, which surpasses other Er<sup>3+</sup>-doped up-conversion specimens. In addition, the phosphors exhibit excellent thermal fatigue resistance and temperature resolution. Results suggest that Ba<sub>2</sub>LuNbO<sub>6</sub>:Er<sup>3+</sup>,Yb<sup>3+</sup> specimens might be applied in the temperature sensing field.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8246-8255"},"PeriodicalIF":3.5,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prediction of glass-forming regions in AlF3-M(PO3)2-R2SO4-based poly-anionic fluoro-sulfo-phosphate glasses AlF3-M(PO3)2-R2SO4 基多阴离子氟磺磷酸盐玻璃中玻璃形成区的预测
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-12 DOI: 10.1111/jace.20055
Weijie Zhu, Weichao Wang, Xin Geng, Yueting Liu, Yao Ji, Binfeng Liang
{"title":"Prediction of glass-forming regions in AlF3-M(PO3)2-R2SO4-based poly-anionic fluoro-sulfo-phosphate glasses","authors":"Weijie Zhu,&nbsp;Weichao Wang,&nbsp;Xin Geng,&nbsp;Yueting Liu,&nbsp;Yao Ji,&nbsp;Binfeng Liang","doi":"10.1111/jace.20055","DOIUrl":"10.1111/jace.20055","url":null,"abstract":"<p>Phosphate glasses have garnered significant attention as host materials for various laser applications due to their high rare-earth ion solubility, large stimulated emission cross-section, and low nonlinear refractive index. Modification of phosphate glass composition is feasible through poly-anion substitution, leading to poly-anionic glasses with unique properties. This study explores the glass-forming regions (GFRs) of AlF<sub>3</sub>-R<sub>2</sub>SO<sub>4</sub>-M(PO<sub>3</sub>)<sub>2</sub>-based poly-anionic fluoro-sulfo-phosphate (R/M-FSP) glasses, a promising class of ionic glasses. Theoretical GFRs are predicted using a thermodynamic approach and then validated through a few experiments. The experimental GFRs range from K/Ba-FSP &gt; Na/Ba-FSP &gt; Li/Ba-FSP &gt; K/Sr-FSP &gt; Na/Sr-FSP &gt; Li/Sr-FSP, with wider areas observed under lower cation field strength. Notably, the K/Ba-FSP glass system exhibits high anti-crystallization stability (approximately 140°C) and a low nonlinear refractive index (1.43 × 10<sup>–13</sup>–1.83 × 10<sup>–13</sup> esu), advantageous for high-power laser operations. Furthermore, a comparative study among K/Ba-FSP glasses elucidates the general principles of manipulating glass structure and physical properties through compositional variation.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8085-8100"},"PeriodicalIF":3.5,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advances in computational ceramics and glasses 计算陶瓷和玻璃的进展
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-12 DOI: 10.1111/jace.20067
Jincheng Du, John C. Mauro, Yanchun Zhou
{"title":"Advances in computational ceramics and glasses","authors":"Jincheng Du,&nbsp;John C. Mauro,&nbsp;Yanchun Zhou","doi":"10.1111/jace.20067","DOIUrl":"10.1111/jace.20067","url":null,"abstract":"","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"7651-7652"},"PeriodicalIF":3.5,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Balancing transparency with enhanced mechanical properties in MgO-Al2O3-SiO2 glass-ceramics 兼顾 MgO-Al2O3-SiO2 玻璃陶瓷的透明度和更强的机械性能
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-12 DOI: 10.1111/jace.20060
Lorena R. Rodrigues, Gisele G. Santos, María Helena R. Acosta, Akio Koike, Shusaku Akiba, Shigeki Sawamura, Mikio Nagano, Satoshi Yoshida, Francisco C. Serbena, Edgar D. Zanotto
{"title":"Balancing transparency with enhanced mechanical properties in MgO-Al2O3-SiO2 glass-ceramics","authors":"Lorena R. Rodrigues,&nbsp;Gisele G. Santos,&nbsp;María Helena R. Acosta,&nbsp;Akio Koike,&nbsp;Shusaku Akiba,&nbsp;Shigeki Sawamura,&nbsp;Mikio Nagano,&nbsp;Satoshi Yoshida,&nbsp;Francisco C. Serbena,&nbsp;Edgar D. Zanotto","doi":"10.1111/jace.20060","DOIUrl":"10.1111/jace.20060","url":null,"abstract":"<p>Transparent glass-ceramics (GCs) are promising for applications that require both optical clarity and superior mechanical strength, such as high-performance displays and ballistic armor. However, achieving this combination typically involves a trade-off, as crystallization processes that enhance mechanical properties often compromise transparency. This study investigates the optimization of mechanical properties in transparent and translucent MgO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> (MAS) GCs. We examine the heat treatment conditions necessary for achieving various levels of transparency and evaluate the influence of crystal size and volume fraction on Vickers hardness, indentation crack resistance, and fracture toughness (K<sub>Ic</sub>). Our findings indicate that, depending on the composition and heat treatment conditions, even nanocrystals smaller than 100 nm can diminish transparency, rendering the GCs translucent. Translucent and opaque samples exhibit superior mechanical performance due to higher crystallized fractions and larger crystals. However, specific thermal protocols were identified to produce transparent GCs (visible light transmittance &gt; 80% for 1.5 mm thick samples) with at least a 30% increase in K<sub>Ic</sub> compared to their parent glasses. This study demonstrates the feasibility of balancing transparency and mechanical strength in MAS GCs through careful optimization of processing parameters.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8101-8116"},"PeriodicalIF":3.5,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magneto-optical effect of rare-earth-rich borate glasses prepared using a levitation technique 利用悬浮技术制备的富稀土硼酸盐玻璃的磁光效应
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-12 DOI: 10.1111/jace.20065
Shunta Sasaki, Katsuhisa Tanaka, Atsunobu Masuno
{"title":"Magneto-optical effect of rare-earth-rich borate glasses prepared using a levitation technique","authors":"Shunta Sasaki,&nbsp;Katsuhisa Tanaka,&nbsp;Atsunobu Masuno","doi":"10.1111/jace.20065","DOIUrl":"10.1111/jace.20065","url":null,"abstract":"<p>The magneto-optical properties of rare-earth-rich borate glasses prepared using a levitation technique were thoroughly investigated. Among the series of rare-earth borate glasses, Tb<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub> and Dy<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub> glasses displayed remarkably large Faraday effects in the visible region. The Verdet constant of 58Tb<sub>2</sub>O<sub>3</sub>–42B<sub>2</sub>O<sub>3</sub> reached −229 rad/T·m at 633 nm, surpassing the value of commercially available single-crystalline Tb<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub>. Compositions with a higher rare-earth oxide content (60 mol%) than that of binary glasses facilitated the successful synthesis of Tb<sub>2</sub>O<sub>3</sub>–Dy<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub> ternary glasses. The Verdet constant linearly increased with increasing Tb<sub>2</sub>O<sub>3</sub> content for the glasses with 40 mol% B<sub>2</sub>O<sub>3</sub>. Results indicate that rare-earth-rich borate glasses are promising candidates for magneto-optical applications in the visible region, and that the types and amounts of rare-earth ion mainly affect these properties.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8126-8131"},"PeriodicalIF":3.5,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bifunctional MnCo2Se4 nano-cubes directly grown on nickel foam for effective water oxidation 直接生长在泡沫镍上的双功能 MnCo2Se4 纳米立方体可有效氧化水
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-11 DOI: 10.1111/jace.20059
Syed Imran Abbas Shah, Karam Jabbour, Nigarish Bano, Muhammad Yousaf Ur Rehman, Razan A. Alshgari, Muhammad Fahad Ehsan
{"title":"Bifunctional MnCo2Se4 nano-cubes directly grown on nickel foam for effective water oxidation","authors":"Syed Imran Abbas Shah,&nbsp;Karam Jabbour,&nbsp;Nigarish Bano,&nbsp;Muhammad Yousaf Ur Rehman,&nbsp;Razan A. Alshgari,&nbsp;Muhammad Fahad Ehsan","doi":"10.1111/jace.20059","DOIUrl":"10.1111/jace.20059","url":null,"abstract":"<p>Green and sustainable energy alternatives to replace fossil fuels are a topic of research in scientific community, thus yielding pursuit of advancing renewable energy systems with hydrogen emerging as a suitable and viable alternative. Efficient and non-precious metal catalysts are crucial for large-scale electrochemical water splitting yielding clean H<sub>2</sub>. Here, a novel two-step hydrothermal synthesis approach to fabricate manganese–cobalt selenide nano-cubes grown directly on nickel foam (NF) (MnCo<sub>2</sub>Se<sub>4</sub>/NF) is adopted. Leveraging its hierarchically structured architecture, augmented active sites, and electrochemically active surface area, MnCo<sub>2</sub>Se<sub>4</sub>/NF material demonstrates exceptional electrocatalytic performance for both water oxidation and reduction. With an overpotential of 233 mV for oxygen evolution reaction (OER) and 187 mV for hydrogen evolution reaction at a current density of 10 mA/cm<sup>2</sup>, MnCo<sub>2</sub>Se<sub>4</sub>/NF also exhibits a Tafel slope of 44 mV/dec for sluggish OER process. Notably, this nanocrystalline catalyst displays enhanced catalytic activity under alkaline conditions, accelerates water dissociation, and maintains good stability over 50 h. Outperforming state-of-the-art RuO<sub>2</sub>, particularly in two-electrode assemblies with an overpotential of 218 mV at 10 mA/cm<sup>2</sup>, this work offers a promising pathway for designing and manufacturing of innovative bifunctional electrocatalysts for efficient water splitting processes, thereby contributing to broader goal of sustainable energy production.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8256-8268"},"PeriodicalIF":3.5,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanisms of ice crystal growth in nanoconfined spaces of cementitious composites at low temperatures: Insights from molecular dynamics simulations 低温下水泥基复合材料纳米约束空间中冰晶生长的机理:分子动力学模拟的启示
IF 3.5 3区 材料科学
Journal of the American Ceramic Society Pub Date : 2024-08-11 DOI: 10.1111/jace.20047
Zhiyu Wang, Yuxin Zhou, Yuan Feng, Junjie Zhang, Rui Yu, Zechuan Yu
{"title":"Mechanisms of ice crystal growth in nanoconfined spaces of cementitious composites at low temperatures: Insights from molecular dynamics simulations","authors":"Zhiyu Wang,&nbsp;Yuxin Zhou,&nbsp;Yuan Feng,&nbsp;Junjie Zhang,&nbsp;Rui Yu,&nbsp;Zechuan Yu","doi":"10.1111/jace.20047","DOIUrl":"10.1111/jace.20047","url":null,"abstract":"<p>This study investigates the dynamics of ice crystal growth and stress distribution in nanoconfined spaces using molecular dynamics simulations. First, the interaction between the pore wall and coarse-grained water is modified, leading to the development of pore models with varying wettability. Subsequently, the process of ice crystal growth within pores of 10 nm diameter is examined under different temperatures and hydrophobicity conditions. Results unveil that ice crystal growth induces substantial energy and enthalpy alterations within the system. Hydrophobic nanopores demonstrate a protective function by limiting ice crystal growth and water transport, thereby mitigating freezing damage. However, hydrophobic nanopores exhibit increased stress levels when saturated with water. The study employs the Zener pinning theory and mass transfer rates to qualitatively scrutinize the thermodynamic and kinetic interplay between the ice crystal interface and the degree of supercooling. These findings offer insights into the mechanisms of ice formation and stress evolution in nanoconfined environments.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"107 12","pages":"8396-8414"},"PeriodicalIF":3.5,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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