Chemistry of Materials最新文献

筛选
英文 中文
Design, Synthesis, and Evaluation of Noble Metal Nanoparticles and In Situ-Decorated Carbon-Supported Nanoparticle Electrocatalysts Using Hypergolic Reactions 利用过醇化反应设计、合成和评估贵金属纳米粒子和原位分解碳支撑纳米粒子电催化剂
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-19 DOI: 10.1021/acs.chemmater.4c02091
Nikolaos Chalmpes, Iosif Tantis, Ahmed Wasel Alsmaeil, Athanasios B. Bourlinos, Emmanuel P. Giannelis
{"title":"Design, Synthesis, and Evaluation of Noble Metal Nanoparticles and In Situ-Decorated Carbon-Supported Nanoparticle Electrocatalysts Using Hypergolic Reactions","authors":"Nikolaos Chalmpes, Iosif Tantis, Ahmed Wasel Alsmaeil, Athanasios B. Bourlinos, Emmanuel P. Giannelis","doi":"10.1021/acs.chemmater.4c02091","DOIUrl":"https://doi.org/10.1021/acs.chemmater.4c02091","url":null,"abstract":"We report the first synthesis of metal nanoparticles and supported metal nanoparticles on carbon by using hypergolic reactions. Specifically, we report the synthesis of noble metal nanoparticles (Pt, Ag, and Au) using sodium hydride (NaH) as both an ignition trigger and a reducing agent for the corresponding metal salt precursors. In addition, we report the one-step, in situ synthesis of Pt nanoparticles supported on carbon by adding sucrose as the carbon source. The hypergolically synthesized nanoparticles display elliptical morphology and are more crystalline compared with those conventionally synthesized in solution using sodium borohydride (NaBH<sub>4</sub>). When tested as electrocatalysts, the hypergolic Pt nanoparticles exhibit more than 2 times higher specific electrochemical active surface area (ECSA) and a higher half-wave potential (<i>E</i><sub>1/2</sub>) of 0.94 V vs the reversible hydrogen electrode (RHE) compared to the conventionally synthesized ones. In addition, the electrocatalyst based on the in situ synthesized carbon that was decorated with the Pt nanoparticles synthesized hypergolically outperforms an analogous, state of the art, commercial PtC system. For example, the former shows an attractive <i>E</i><sub>1/2</sub> (0.94 V) compared with 0.9 V for the commercial PtC. Accelerated durability tests (ADT) in an alkaline environment add another advantage. After 10 000 cycles, the hypergolically synthesized system shows a smaller reduction of <i>E</i><sub>1/2</sub> and less degradation compared to the commercial PtC (10 mV compared to ∼30 mV). The work described here represents the first reported synthesis using hypergolic reactions of metal nanoparticles as well as supported metal nanoparticles. The properties of the resulting electrocatalysts demonstrate the versatility and promise of the new approach in materials synthesis and open new avenues for further investigation as electrocatalysts.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Layered and Low-Dimensional Lead, Silver, and Bismuth Halide Perovskites Directed by Halogen-Substituted Spacer Cations 卤素取代的间隔阳离子引导的层状和低维铅银铋卤化物包光体
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-19 DOI: 10.1021/acs.chemmater.4c02083
Jonathan Schimmels, Willa Mihalyi-Koch, Chris R. Roy, Kyana M. Sanders, John C. Wright, Song Jin
{"title":"Layered and Low-Dimensional Lead, Silver, and Bismuth Halide Perovskites Directed by Halogen-Substituted Spacer Cations","authors":"Jonathan Schimmels, Willa Mihalyi-Koch, Chris R. Roy, Kyana M. Sanders, John C. Wright, Song Jin","doi":"10.1021/acs.chemmater.4c02083","DOIUrl":"https://doi.org/10.1021/acs.chemmater.4c02083","url":null,"abstract":"Hybrid organic–inorganic metal halides provide a diverse parameter space in which the optoelectronic properties can be tuned through the composition. The compositional tunability extends to the metal site, which can be expanded from single valent metals (<i>e.g</i>., Pb<sup>2+</sup>) to multivalent metals (<i>e.g</i>., Ag<sup>+</sup> and Bi<sup>3+</sup>), and the dimension (2D, 1D, or 0D). However, a deeper understanding of how the organic cations template these metal halide structures is needed. Here, we synthesize and study the structures of a series of new layered and low-dimensional metal (Pb, Ag, and Bi) halides templated by the halogenated aryl spacer cations 2-chlorobenzylammonium (2ClBZ) and 3-chloro-2-fluorobenzylammonium (3Cl2FBZ). We report new lead perovskites, (3Cl2FBZ)<sub>2</sub>PbBr<sub>4</sub>, (2ClBZ)<sub>3</sub>PbI<sub>5</sub>, and (3Cl2FBZ)<sub>2</sub>PbI<sub>4</sub>, and compare them to their silver and/or bismuth analogs (2ClBZ)<sub>4</sub>AgBiBr<sub>8</sub>, (3Cl2FBZ)<sub>4</sub>AgBiBr<sub>8</sub>, (2ClBZ)<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub>, and (3Cl2FBZ)<sub>4</sub>Bi<sub>2</sub>I<sub>10</sub>. In all structures, the halogen-substituted cations result in 2D or “pseudo-2D” layering, but the different halogen substituents introduce different distortions (tilting, octahedral distortion) and dimensional reduction to 1D or 0D depending on the metal and halide compositions. Optical absorption measurements reveal the bandgaps are tunable through metal sites, dimension, and cations to different extents. Furthermore, the 1D (3Cl2FBZ)<sub>4</sub>Bi<sub>2</sub>I<sub>10</sub> crystallizes in the noncentrosymmetric space group <i>Cmc</i>2<sub>1</sub> and exhibits second-harmonic generation (SHG). The organic–inorganic interactions and resultant structural distortions examined here provide insights toward the engineering of noncentrosymmetry and dimensional control in hybrid metal halide perovskites.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Understanding the Formation of Colloidal Ferrimagnetic CuCr2Se4 Nanocrystals with Strong Room-Temperature Magnetic Circular Dichroism 了解具有室温强磁环二色性的胶体铁磁性 CuCr2Se4 纳米晶体的形成过程
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-18 DOI: 10.1021/acs.chemmater.4c02365
Samantha Harvey, Jonathan M. DeStefano, Jiun-Haw Chu, Daniel R. Gamelin, Brandi M. Cossairt
{"title":"Understanding the Formation of Colloidal Ferrimagnetic CuCr2Se4 Nanocrystals with Strong Room-Temperature Magnetic Circular Dichroism","authors":"Samantha Harvey, Jonathan M. DeStefano, Jiun-Haw Chu, Daniel R. Gamelin, Brandi M. Cossairt","doi":"10.1021/acs.chemmater.4c02365","DOIUrl":"https://doi.org/10.1021/acs.chemmater.4c02365","url":null,"abstract":"The ongoing development and eventual implementation of magnetic nanocrystals in devices requires not only syntheses that can bring bulk compositions down to the nanoscale but also a deep understanding of their formation such that size, morphology, and composition can be finely tuned. Chromium chalcogenide spinels are a class of materials that epitomize this dilemma; their unique magnetic and magneto-optical properties make them promising for applications in spintronics, data storage, and quantum information sciences, but only a few compositions have been synthesized as colloidal nanocrystals. Furthermore, these few existing reports lack mechanistic understanding and demonstrate little control over the physical characteristics of the final products. Here, we set forth to understand the synthesis of CuCr<sub>2</sub>Se<sub>4</sub> nanocrystals by examining how the structure, composition, and magnetic properties evolve over the course of the reaction. We find that the material proceeds through binary copper selenide nanocrystal intermediates followed by Cr incorporation via diffusion. This process results in polycrystalline CuCr<sub>2</sub>Se<sub>4</sub> nanocrystals that do not exhibit magnetic ordering until Cu incorporation modifies their stoichiometry and defects are annealed, which takes approximately 40 min at 340 °C to achieve. The resulting CuCr<sub>2</sub>Se<sub>4</sub> nanocrystals show a strongly enhanced magnetic circular dichroism signal at the bulk plasma frequency of <i>ℏ</i>ω<sub>pl</sub> ∼ 1.0 eV with a field dependence that reflects magnetization of the Cr<sup>3+</sup> spin sublattice. These results highlight the possibility of solution processing strong near-IR magneto-optical materials for future device integration.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Ultrasoft Conducting Polymer Hydrogels with Large Biaxial Strain and Conformal Adhesion for Sensitive Flexible Sensors 用于灵敏柔性传感器的具有大双轴应变和共形粘附性的超软导电聚合物水凝胶
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-18 DOI: 10.1021/acs.chemmater.4c01909
Xiaojiao Shi, Linli Xu, Qiuli Xu, Na Li, Xinyu Li, Yubin Zhang, Zhihui Qin, Tifeng Jiao
{"title":"Ultrasoft Conducting Polymer Hydrogels with Large Biaxial Strain and Conformal Adhesion for Sensitive Flexible Sensors","authors":"Xiaojiao Shi, Linli Xu, Qiuli Xu, Na Li, Xinyu Li, Yubin Zhang, Zhihui Qin, Tifeng Jiao","doi":"10.1021/acs.chemmater.4c01909","DOIUrl":"https://doi.org/10.1021/acs.chemmater.4c01909","url":null,"abstract":"Conducting polymer hydrogels have been considered as promising materials for flexible sensors. The integrated performances of ultrasoftness, high deformation, mechanical robustness, conformal adhesion, and high sensitivity are of great importance for their applications in wearable sensors but still remains challenging. Herein, a highly deformable conducting polymer hydrogel with ultrasoftness, tear resistance, and self-adhesiveness is fabricated by incorporating poly(3, 4-ethylenedioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS) and silk sericin (SS) into a covalently cross-linked polyacrylamide (PAM) network. Owing to abundant noncovalent interactions among the folded SS chains, PAM chains, and PEDOT:PSS, the obtained hydrogel shows a low modulus (10.3 kPa), ultrastretchability (&gt;2000%), particularly large biaxial strain (an areal strain of 1700%), high toughness (tearing energy of 2.5 kJ/m<sup>2</sup>), and good conformal adhesion. As a result, this hydrogel demonstrates superior strain-sensitivity (gauge factor = 13.8) in a broad strain range (2000%) and excellent sensing reproducibility. The hydrogel-based wearable sensor can be used for accurately monitoring large and tiny human movements in real time and serves as bioelectrodes for precise gathering of electrocardiography and electromyography signals, showing great potential for applications in flexible sensing devices.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142448648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Hydrogen Bonds Defined Pore Windows Enable Sieving Separation of Propylene from Propane in an Ultramicroporous Metal–Organic Framework 氢键定义的孔窗使超微多孔金属有机框架中丙烯与丙烷的筛分分离成为可能
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-18 DOI: 10.1021/acs.chemmater.4c02251
Xiang-Jing Kong, Ming-Ming Xu, Tao He, Lin-Hua Xie, Yu-Hui Liu, Xin Zhang, Hao-Tian Wang, Jian-Rong Li
{"title":"Hydrogen Bonds Defined Pore Windows Enable Sieving Separation of Propylene from Propane in an Ultramicroporous Metal–Organic Framework","authors":"Xiang-Jing Kong, Ming-Ming Xu, Tao He, Lin-Hua Xie, Yu-Hui Liu, Xin Zhang, Hao-Tian Wang, Jian-Rong Li","doi":"10.1021/acs.chemmater.4c02251","DOIUrl":"https://doi.org/10.1021/acs.chemmater.4c02251","url":null,"abstract":"Tailoring a MOF with suitable pore windows for the sieving C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> separation is attractive but challenging, where controlling the local framework flexibility by introducing functionality provides a solution. In this work, four isoreticular ultramicroporous Zn–triazolate–dicarboxylate frameworks, <b>Zn-ATZ-IP(R)</b> (R = −F, −OH, −NH<sub>2</sub>, and −CH<sub>3</sub>) (HATZ = 3-amino-1,2,4-triazole; H<sub>2</sub>IP-R = R group functionalized isophthalic acid) with variable pore apertures, were targeted as platforms to study the effect of functional groups on their separation performance. Single-component adsorption isotherms uncovered the potential of <b>Zn-ATZ-IP(OH)-a</b> with hydroxyl groups as a sieving adsorbent. Single X-ray diffraction (SXRD) measurements revealed that strong intraframework hydrogen bonds hinder the free torsion of ATZ<sup>–</sup> ligand in <b>Zn-ATZ-IP(OH)-a</b>, defining rigid pore windows that admit C<sub>3</sub>H<sub>6</sub> while exclude C<sub>3</sub>H<sub>8</sub>, whereas other groups give adaptive larger pores that allow both C<sub>3</sub>H<sub>6</sub> and C<sub>3</sub>H<sub>8</sub> in. Further, <i>in situ</i> XRD measurements suggested that temperature alters the strength of hydrogen bonds, making <b>Zn-ATZ-IP(OH)-a</b> ideal for room-temperature sieving of C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub>. This work highlights the superiority of customizing sieving pores sustained by hydrogen bonds, which advances the rational design of smart adsorbents for energy-efficient light hydrocarbon separations.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142448642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Rapid Modeling of the Local Structure of Metal Oxide Nanoparticles from PDF Data: A Case Study Using TiO2 Nanoparticles 从 PDF 数据快速建模金属氧化物纳米粒子的局部结构:使用二氧化钛纳米粒子的案例研究
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-18 DOI: 10.1021/acs.chemmater.3c03002
Songsheng Tao, Jonas Billet, Jonathan De Roo, Simon J. L. Billinge
{"title":"Rapid Modeling of the Local Structure of Metal Oxide Nanoparticles from PDF Data: A Case Study Using TiO2 Nanoparticles","authors":"Songsheng Tao, Jonas Billet, Jonathan De Roo, Simon J. L. Billinge","doi":"10.1021/acs.chemmater.3c03002","DOIUrl":"https://doi.org/10.1021/acs.chemmater.3c03002","url":null,"abstract":"A detailed workflow is presented for applying attenuated crystal modeling (ACM) of atomic pair distribution functions from TiO<sub>2</sub> nanoparticles to understand the structure and morphology of the nanoparticles. We use small-box modeling approaches with the diffpy<span>-CMI</span>software program. The modeling reveals that all synthesis conditions yield nanoparticles with a majority bronze phase and a minority anatase phase, with the synthesis temperature affecting the proportion of impurity phase and the size of the nanoparticles. The fast, straightforward, and reliable workflow is widely applicable for modeling PDFs of most inorganic nanoparticles as long as hypothesized ACM models are available, providing a helpful guide for researchers to analyze the structure of nanoparticles from PDF data.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142448643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Tuning Optical and Electrical Properties of Vanadium Oxide with Topochemical Reduction and Substitutional Tin 用拓扑化学还原和取代锡调谐氧化钒的光学和电学特性
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-17 DOI: 10.1021/acs.chemmater.4c01557
Lance M. Wheeler, Thanh Luan Phan, Michelle A. Smeaton, Swagata Acharya, Shruti Hariyani, Marlena E. Alexander, Miranda I. Gonzalez, Elisa M. Miller, David W. Mulder, Sarbajit Banerjee, Katherine L. Jungjohann, Andrew J. Ferguson, Jeffrey L. Blackburn
{"title":"Tuning Optical and Electrical Properties of Vanadium Oxide with Topochemical Reduction and Substitutional Tin","authors":"Lance M. Wheeler, Thanh Luan Phan, Michelle A. Smeaton, Swagata Acharya, Shruti Hariyani, Marlena E. Alexander, Miranda I. Gonzalez, Elisa M. Miller, David W. Mulder, Sarbajit Banerjee, Katherine L. Jungjohann, Andrew J. Ferguson, Jeffrey L. Blackburn","doi":"10.1021/acs.chemmater.4c01557","DOIUrl":"https://doi.org/10.1021/acs.chemmater.4c01557","url":null,"abstract":"Vanadium oxides are widely tunable materials, with many thermodynamically stable phases suitable for applications spanning catalysis to neuromorphic computing. The stability of vanadium in a range of oxidation states enables mixed-valence polymorphs of kinetically accessible metastable materials. Low-temperature synthetic routes to, and the properties of, these metastable materials are poorly understood and may unlock new optoelectronic and magnetic functionalities for expanded applications. In this work, we demonstrate topochemical reduction of α-V<sub>2</sub>O<sub>5</sub> to produce metastable vanadium oxide phases with tunable oxygen vacancies (&gt;6%) and simultaneous substitutional tin incorporation (&gt;3.5%). The chemistry is carried out at low temperature (65 °C) with solution-phase SnCl<sub>2</sub>, where Sn<sup>2+</sup> is oxidized to Sn<sup>4+</sup> as V<sup>5+</sup> sites are reduced to V<sup>4+</sup> during oxygen vacancy formation. Despite high oxygen vacancy and tin concentrations, the transformations are topochemical in that the symmetry of the parent crystal remains intact, although the unit cell expands. Band structure calculations show that these vacancies contribute electrons to the lattice, whereas substitutional tin contributes holes, yielding a compensation doping effect and control over the electronic properties. The SnCl<sub>2</sub> redox chemistry is effective on both solution-processed V<sub>2</sub>O<sub>5</sub> nanoparticle inks and mesoporous films cast from untreated inks, enabling versatile routes toward functional films with tunable optical and electronic properties. The electrical conductance rises concomitantly with the SnCl<sub>2</sub> concentration and treatment time, indicating a net increase in density of free electrons in the host lattice. This work provides a valuable demonstration of kinetic tailoring of electronic properties of vanadium–oxygen systems through top-down chemical manipulation from known thermodynamic phases.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
In Operando Evaluation of Heterogeneity Development in Fast-Cycled Single-Layer Pouch Cells 对快速循环单层袋细胞异质性发展的操作中评估
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-17 DOI: 10.1021/acs.chemmater.4c01483
Daniel Risskov Sørensen, Ronald Gordon, Anna Smith, Innokenty Kantor, Mads Ry Vogel Jørgensen
{"title":"In Operando Evaluation of Heterogeneity Development in Fast-Cycled Single-Layer Pouch Cells","authors":"Daniel Risskov Sørensen, Ronald Gordon, Anna Smith, Innokenty Kantor, Mads Ry Vogel Jørgensen","doi":"10.1021/acs.chemmater.4c01483","DOIUrl":"https://doi.org/10.1021/acs.chemmater.4c01483","url":null,"abstract":"Investigating Li-ion batteries during high current rates is becoming increasingly important to advance fast charging of electric vehicles. Here, we use a state-of-the-art synchrotron instrument and detector to measure spatially resolved X-ray diffraction in operando on single-layer pouch cells at 1C and 3C. Using batch refinement on the hundreds of thousands of obtained diffractograms, the electrode lithiation inhomogeneity across the cells induced by cell cycling could be probed. The inhomogeneity was found to depend significantly on C-rate, and the cells were generally more electrochemically active in the center than close to the edges. At high current rates, the expected sequence of lithiated stages in the graphite anode was found to no longer hold. Areas of the electrodes were also found to behave very differently from others, probably due to local differences in resistance. These behaviors are detectable only at high C-rates using in operando methods. Using the methods developed in this work allows for investigating pouch cells that are close to commercial sizes.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142448646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Simple Molecular Synthetic Approach to Dinuclear Titanium Sites in Ti-Containing Silica-Based Catalysts 含钛硅基催化剂中双核钛位的简单分子合成方法
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-17 DOI: 10.1021/acs.chemmater.4c01454
Takuya Hikino, Yuka Kawakubo, Takamichi Matsuno, Seiji Yamazoe, Kazuyuki Kuroda, Atsushi Shimojima
{"title":"Simple Molecular Synthetic Approach to Dinuclear Titanium Sites in Ti-Containing Silica-Based Catalysts","authors":"Takuya Hikino, Yuka Kawakubo, Takamichi Matsuno, Seiji Yamazoe, Kazuyuki Kuroda, Atsushi Shimojima","doi":"10.1021/acs.chemmater.4c01454","DOIUrl":"https://doi.org/10.1021/acs.chemmater.4c01454","url":null,"abstract":"Ti-containing silica-based catalysts are widely used for various organic oxidation reactions. Recently, increasing attention has been paid to the catalytic role of dinuclear (SiO)<sub>3</sub>Ti–O–Ti(OSi)<sub>3</sub> sites in titanosilicate zeolite TS-1. A promising experimental approach for elucidating the active sites is to use model compounds with dinuclear Ti sites. In this study, we report the synthesis and catalytic properties of a μ-oxo-bridged dinuclear titanosiloxane compound with a (SiO)<sub>3</sub>Ti–O–Ti(OSi)<sub>3</sub> site. A Ti-containing cage siloxane compound (<sup><i>i</i></sup>Bu<sub>7</sub>Si<sub>7</sub>O<sub>12</sub>)TiO<sup><i>i</i></sup>Pr (mononuclear Ti-polyhedral oligomeric silsesquioxane (POSS)) is prepared by the reaction of incompletely condensed POSS with titanium tetraisopropoxide. Then, it is converted to the dinuclear species (<sup><i>i</i></sup>Bu<sub>7</sub>Si<sub>7</sub>O<sub>12</sub>)<sub>2</sub>Ti<sub>2</sub>(μ-O) (dinuclear Ti-POSS) by the simple hydrolytic condensation of the TiO<sup><i>i</i></sup>Pr groups. The addition of H<sub>2</sub>O<sub>2</sub> to dinuclear Ti-POSS leads to the formation of a bishydroperoxo complex, as revealed by Ti K-edge X-ray absorption fine structure analysis. Dinuclear Ti-POSS possesses high catalytic activity in the cyclohexene epoxidation reaction, indicating that the (SiO)<sub>3</sub>Ti–O–Ti(OSi)<sub>3</sub> sites can function as efficient catalytically active sites. These findings contribute to the comprehension of the catalytic properties exhibited by dinuclear titanium sites within titanosilicate zeolite catalysts.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Liquid Phase-Made Aluminum Nanoparticles and Their Hydrogen Sorption as Aluminum/LiH Composite 液相铝纳米粒子及其作为铝/LiH 复合材料的吸氢性能
IF 8.6 2区 材料科学
Chemistry of Materials Pub Date : 2024-10-16 DOI: 10.1021/acs.chemmater.4c01533
Sven Riegsinger, Radian Popescu, Dagmar Gerthsen, Claus Feldmann
{"title":"Liquid Phase-Made Aluminum Nanoparticles and Their Hydrogen Sorption as Aluminum/LiH Composite","authors":"Sven Riegsinger, Radian Popescu, Dagmar Gerthsen, Claus Feldmann","doi":"10.1021/acs.chemmater.4c01533","DOIUrl":"https://doi.org/10.1021/acs.chemmater.4c01533","url":null,"abstract":"Aluminum nanoparticles, Al(0), are prepared in toluene at room temperature (25 °C) by reduction of AlH<sub>3</sub> with dilithium naphthalenide ([Li<sub>2</sub>Naph]). To dissolve the starting materials in toluene, AlH<sub>3</sub> and [Li<sub>2</sub>Naph] are coordinated by <i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-tetramethylethylendiamin (TMEDA). The as-prepared Al(0) nanoparticles are monocrystalline and exhibit a uniform size of 11 ± 3 nm with narrow size distribution. They are highly reactive, as indicated by reaction in air and even with nitrogen. Besides the formation of Al(0) nanoparticles, the [Li<sub>2</sub>Naph]-driven reduction of AlH<sub>3</sub> results in the formation of LiAlH<sub>4</sub> as a side phase, which can be removed but is difficult to remove due to its low solubility in solvents that do not react with the Al(0) nanoparticles (e.g., toluene, THF). The presence of LiAlH<sub>4</sub> and the formation of a Al(0) nanoparticle/LiAlH<sub>4</sub> composite, however, turned out to be advantageous in regard to H<sub>2</sub> sorption. After thermal transition of LiAlH<sub>4</sub> to LiH (250 °C, vacuum), the resulting Al(0) nanoparticle/LiH composite shows promising H<sub>2</sub> sorption and H<sub>2</sub> uptake at 250 °C and 100 bar of H<sub>2</sub> with a gravimetric capacity of 3.8%. After modification of the Al(0) nanoparticles with 1 wt % Pd for activation, the H<sub>2</sub> uptake occurs at even a reduced temperature of 150 °C.","PeriodicalId":33,"journal":{"name":"Chemistry of Materials","volume":null,"pages":null},"PeriodicalIF":8.6,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信