Chemistry methods : new approaches to solving problems in chemistry最新文献_第5页

Chemogenetic Tools in Focus: Proximity, Conformation, and Sterics 聚焦化学遗传工具：邻近性、构象和立体性

IF 6.1

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2024-02-29 DOI: 10.1002/cmtd.202300051

Dr. Jiaqi Shen, Guanwei Zhou, Prof. Dr. Wenjing Wang

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Cover Picture: (Chem. Methods 2/2024) 封面图片：（化学方法 2/2024）

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2024-02-08 DOI: 10.1002/cmtd.202480201

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Versatile Spectroscopic Cell for Operando Studies in Heterogeneous Catalysis Using Tender X-ray Spectroscopy in Fluorescence Mode 利用荧光模式下的嫩 X 射线光谱进行异相催化操作研究的多功能光谱池

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2024-01-16 DOI: 10.1002/cmtd.202300044

H. A. Suarez Orduz, S.-L. Heck, Dr. P. Dolcet, Dr. Y. Watier, Dr. M. Casapu, Prof. Dr. J.-D. Grunwaldt, Dr. P. Glatzel

{"title":"Versatile Spectroscopic Cell for Operando Studies in Heterogeneous Catalysis Using Tender X-ray Spectroscopy in Fluorescence Mode","authors":"H. A. Suarez Orduz, S.-L. Heck, Dr. P. Dolcet, Dr. Y. Watier, Dr. M. Casapu, Prof. Dr. J.-D. Grunwaldt, Dr. P. Glatzel","doi":"10.1002/cmtd.202300044","DOIUrl":"10.1002/cmtd.202300044","url":null,"abstract":"The design and commissioning of a cell suitable for operando studies using high-energy-resolution fluorescence-detected X-ray absorption near-edge structure (HERFD-XANES) spectroscopy in the tender X-ray regime is reported. The cell is optimized for measurements within the energy range of 1.5 keV to 4.5 keV. It has a plug-flow geometry and can be used for sieved powder samples, analogous to reactors employed for laboratory tests. The functionality of the spectroscopic cell is demonstrated in the area of emission control using CO oxidation as target reaction over 1 wt.% Rh/γ-Al2O3 as catalyst. We show how HERFD-XANES at the Rh L3-edge captures variations in the noble metal structure resulting from the interaction with the support material and reactant molecules. Moreover, distinct structural changes were identified along the catalyst bed as a function of temperature and local gas mixture.","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202300044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139618687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Impedance Response Analysis of Anion Exchange Membrane Electrolyzers for Determination of the Electrochemically Active Catalyst Surface Area 用于确定电化学活性催化剂表面积的阴离子交换膜电解器阻抗响应分析

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2024-01-12 DOI: 10.1002/cmtd.202300035

Dr. Sebastian A. Watzele, Dr. Regina M. Kluge, Dr. Artjom Maljusch, Patrick Borowski, Prof. Dr. Aliaksandr S. Bandarenka

{"title":"Impedance Response Analysis of Anion Exchange Membrane Electrolyzers for Determination of the Electrochemically Active Catalyst Surface Area","authors":"Dr. Sebastian A. Watzele, Dr. Regina M. Kluge, Dr. Artjom Maljusch, Patrick Borowski, Prof. Dr. Aliaksandr S. Bandarenka","doi":"10.1002/cmtd.202300035","DOIUrl":"10.1002/cmtd.202300035","url":null,"abstract":"Polymer membrane electrolyzers benefit from high-pressure operation conditions and low gas cross-over and can either conduct protons (H+) or hydroxide ions (OH−). Both types of electrolyzers have a similar design, but differ in power density and the choice of catalysts. Despite the significant endeavor of their optimization, to date, there is no well-established impedance model for detailed analysis for either type of these devices. This complicates the in-situ characterization of electrolyzers, hindering the investigation of degradation mechanisms and electrocatalytic processes as a function of applied current density or time. Nevertheless, a detailed understanding of such individual processes and distinguishing the performance-limiting factors are the keystones for sophisticated device optimization. In this work, an impedance model based on electrode processes has been developed for an anion exchange membrane electrolyzer utilizing iridium oxide anode and platinum cathode electrocatalysts. This model allows to deconvolute the measured impedances into constituents related to the individual electrode processes and to estimate actual physico-chemical quantities such as the reaction kinetic parameters and double-layer capacitances. We discuss the meaning of the fitting parameters and show that this model enables, for the first time, the estimation of the electrochemically active surface area of the anode electrocatalysts under reaction conditions.","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202300035","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139623695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Cover Picture: (Chem. Methods 1/2024) 封面图片：（化学方法 1/2024）

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2024-01-08 DOI: 10.1002/cmtd.202480101

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pHbot: Self-Driven Robot for pH Adjustment of Viscous Formulations via Physics-informed-ML** pHbot：通过物理信息ML**实现粘性配方 pH 值调节的自驱动机器人

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2023-12-13 DOI: 10.1002/cmtd.202300043

Aniket Chitre, Dr. Jayce Cheng, Sarfaraz Ahamed, Robert C. M. Querimit, Dr. Benchuan Zhu, Dr. Ke Wang, Dr. Long Wang, Prof. Kedar Hippalgaonkar, Prof. Alexei A. Lapkin

{"title":"pHbot: Self-Driven Robot for pH Adjustment of Viscous Formulations via Physics-informed-ML**","authors":"Aniket Chitre, Dr. Jayce Cheng, Sarfaraz Ahamed, Robert C. M. Querimit, Dr. Benchuan Zhu, Dr. Ke Wang, Dr. Long Wang, Prof. Kedar Hippalgaonkar, Prof. Alexei A. Lapkin","doi":"10.1002/cmtd.202300043","DOIUrl":"10.1002/cmtd.202300043","url":null,"abstract":"pH adjustment is crucial for many industrial products, yet this step is typically performed by manual trial-and-error. A particularly industrially relevant yet challenging titration is that of adjusting viscous liquid formulations using weak, polyprotic titrants (usually citric acid). Handling of viscous, non-Newtonian formulations, with such polyprotic acids preferred for their chelation and buffering effects make a robotic solution challenging. We present a self-driving pH robot integrated with physics-informed learning; this hybrid physical-ML model enables automated titration with weak-strong acid/base pairs. To deal with the high viscosities of these formulations, we developed specific automated mixing and cleaning protocols. We hit the target pH within two to five iterations over 250 distinct formulations in lab-scale small-batch (~10 mL and 12 samples) titrations. In the interest of scaling up to match industrial processes, we also demonstrate that our hybrid algorithm works at ~25× scale-up. The method is general, and we open-source our algorithm and designs.","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202300043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139181006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Cover Picture: (Chem. Methods 12/2023) 封面图片:(化学)方法12/2023)

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2023-12-06 DOI: 10.1002/cmtd.202381201

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Opportunities and Obstacles in LCTEM Nanoimaging – A Review LCTEM 纳米成像的机遇与障碍 - 综述

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2023-12-05 DOI: 10.1002/cmtd.202300041

Tomasz Tarnawski, Prof. Magdalena Parlińska-Wojtan

{"title":"Opportunities and Obstacles in LCTEM Nanoimaging – A Review","authors":"Tomasz Tarnawski, Prof. Magdalena Parlińska-Wojtan","doi":"10.1002/cmtd.202300041","DOIUrl":"https://doi.org/10.1002/cmtd.202300041","url":null,"abstract":"Liquid Cell Transmission Electron Microscopy (LCTEM) is a great progression in nanostructure imaging, allowing the observation of chemical reactions in real time. It is widely reported, that this technique can be successfully used for analyzing nanoparticles synthesis, diffusion, aggregation and degradation. This gives a completely new insight into nanotechnological research. Normally, samples in TEM must be observed in vacuum, showing only the results of a performed experiment, whereas in situ observations in liquid environment provide information about the dynamics of the processes. LCTEM can show, how orientation of the particles/aggregates, surface roughness or solution flow rate influence the examined reaction. Those data are highly valuable for creating kinetic models of the reactions. There are however still some obstacles in LCTEM. Imaging of nanostructures in liquid environment is problematic since the electron beam reportedly may affect the observed sample. The beam modifies the temperature and pH of the liquid sample, changing the process dynamics. Therefore, its influence needs to be considered during in situ TEM observations. Nevertheless, LCTEM remains one of the highest achievements in the field of nanostructures imaging. In this review, recent achievements and developments of the LCTEM technique are presented.","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202300041","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140066516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the Capability of Framework Materials to Improve Cathodes’ Performance for High-energy Lithium-ion Batteries 探索框架材料提高高能锂离子电池阴极性能的能力

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2023-11-30 DOI: 10.1002/cmtd.202300039

Dr. Rajashree Konar, Dr. Sandipan Maiti, Prof. Boris Markovsky, Dr. Hadar Sclar, Prof. Doron Aurbach

{"title":"Exploring the Capability of Framework Materials to Improve Cathodes’ Performance for High-energy Lithium-ion Batteries","authors":"Dr. Rajashree Konar, Dr. Sandipan Maiti, Prof. Boris Markovsky, Dr. Hadar Sclar, Prof. Doron Aurbach","doi":"10.1002/cmtd.202300039","DOIUrl":"10.1002/cmtd.202300039","url":null,"abstract":"Lithiated transition metal oxides are the most important cathode materials for lithium-ion batteries. Many efforts have been devoted in recent years to improving their energy density, stability, and safety, as demonstrated by thousands of publications. However, the commercialization of several promising materials is limited due to obstacles like stability limitations. To overcome the limitations of energetically high-voltage or high-capacity cathode materials, unconventional solutions for their surface engineering were suggested; among them, metal–organic frameworks (MOFs) and zeolites have been employed. MOFs possess favorable characteristics for stabilization goals, including manageable structures, topological control, high porosity, large surface area, and low density. This review article explores promising strategies for improving the electrochemical behavior of favorable cathode materials through surface modifications by using MOFs and zeolites. Investigating the potential of this frameworks-based surface engineering for high energy density batteries’ electrodes is essential for optimal control of their surface chemistry. It may be highly effective to upgrade the performance of high-energy cathode materials, thus extending the practical use of very high energy density rechargeable batteries.","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202300039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139207980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Cover Picture: (Chem. Methods 11/2023) 封面图片：（化学方法2023年11月）

Chemistry methods : new approaches to solving problems in chemistry Pub Date : 2023-11-06 DOI: 10.1002/cmtd.202381101

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