Science China Chemistry最新文献_第10页

Recovering noble metals from waste streams using porous organic frameworks for heterogeneous catalysis 利用多孔有机框架进行异相催化，从废物流中回收贵金属

IF 10.4 1区化学

Science China Chemistry Pub Date : 2024-09-20 DOI: 10.1007/s11426-024-2021-5

Yu Pan, Michelle Åhlén, Maria Strømme, Chao Xu

引用次数: 0

Electrochemical impedance spectroscopy analysis to accelerate electrocatalytic system innovation 电化学阻抗谱分析加速电催化体系创新

IF 10.4 1区化学

Science China Chemistry Pub Date : 2024-09-19 DOI: 10.1007/s11426-024-2314-9

Hanbing Zhu, Yinghuan Liu, Wenxin Guo, Jinyu Zheng, Yao Zheng, Serhiy Cherevko, Cheng Tang, Qiang Zhang

{"title":"Electrochemical impedance spectroscopy analysis to accelerate electrocatalytic system innovation","authors":"Hanbing Zhu, Yinghuan Liu, Wenxin Guo, Jinyu Zheng, Yao Zheng, Serhiy Cherevko, Cheng Tang, Qiang Zhang","doi":"10.1007/s11426-024-2314-9","DOIUrl":"10.1007/s11426-024-2314-9","url":null,"abstract":"<div><p>Electrochemical impedance spectroscopy (EIS) is a well-established non-destructive characterization technique for assessing the efficacy of electrochemical energy storage and conversion systems. Electrocatalytic systems based on proton exchange membrane (PEM), including PEM fuel cells and PEM water electrolyzers, play a crucial role in renewable energy conversion through electricity–hydrogen interconversion. EIS, along with its derived analysis methods—equivalent circuit model (ECM), distribution of relaxation time (DRT), and dynamic EIS (DEIS), is widely utilized to extract valuable kinetics and impedance data. The acquired information affords critical insights into processes such as mass transfer, charge transfer, and proton transfer within PEM systems. This mini review surveys the role of EIS in optimizing components and investigating operational conditions to enhance the efficiency of PEM systems. In addition, it encapsulates the principles and applications of EIS-based methods like DRT and DEIS, highlighting their potential in the practical application of PEM systems.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":772,"journal":{"name":"Science China Chemistry","volume":"67 12","pages":"3964 - 3975"},"PeriodicalIF":10.4,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nucleophilic trifluoromethylation with CF3H/LiHMDS: probing the nucleophilic reactivity of LiCF3 species 用 CF3H/LiHMDS 进行亲核三氟甲基化反应：探究 LiCF3 物种的亲核反应性

IF 10.4 1区化学

Science China Chemistry Pub Date : 2024-09-18 DOI: 10.1007/s11426-024-2289-7

Yangfan Liu, Xiu Wang, Chuanfa Ni, Jinbo Hu

{"title":"Nucleophilic trifluoromethylation with CF3H/LiHMDS: probing the nucleophilic reactivity of LiCF3 species","authors":"Yangfan Liu, Xiu Wang, Chuanfa Ni, Jinbo Hu","doi":"10.1007/s11426-024-2289-7","DOIUrl":"10.1007/s11426-024-2289-7","url":null,"abstract":"<div><p>The nucleophilic trifluoromethylation involving trifluoromethyllithium (LiCF<sub>3</sub>) species has been an open question since Haszeldine attempted to prepare LiCF<sub>3</sub> in 1949. Indeed, LiCF<sub>3</sub> has been used for electrophilic difluoromethylene transfer processes (<i>via</i> elimination of fluoride ions) since 2010. Herein, we demonstrated that by using a polar solvent such as dimethylformamide (DMF) or hexamethylphosphoramide (HMPA) as the lithium chelator, the <i>in situ</i> deprotonation of fluoroform (HCF<sub>3</sub>) with lithium hexamethyldisilazide (LiHMDS) could generate a tamed LiCF<sub>3</sub> species that is sufficiently persistent to undergo nucleophilic trifluoromethylation reaction. The nucleophilic reactivity of LiCF<sub>3</sub> species was probed with several electrophiles, including arylsulfonyl fluorides, diaryl ketones, and silyl chlorides. The synthetic utility of this method is demonstrated with the efficient synthesis of highly valuable triflones that are otherwise difficult to synthesize from HCF<sub>3</sub> using potassium or sodium bases. This work not only showcases a new protocol for the utilization of fluoroform (an industrial waste with high global warming potential) as the trifluoromethylation reagent, but also provides intriguing insights into the harnessing of nucleophilic reactivity of the transient LiCF<sub>3</sub> species.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":772,"journal":{"name":"Science China Chemistry","volume":"68 2","pages":"505 - 512"},"PeriodicalIF":10.4,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11426-024-2289-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visible-light-induced organocatalyzed C(sp2)-H bond functionalization of 1,3-azoles with trifluoroacetylsilanes 三氟乙酰基硅烷在可见光诱导下有机催化 1,3-唑的 C(sp2)-H键官能化

IF 10.4 1区化学

Science China Chemistry Pub Date : 2024-09-18 DOI: 10.1007/s11426-024-2203-5

Zhengyu Li, Zeguo Zhang, Zhihan Zhang, Gang Zhou, Yizhi Zhang, Shanshan Liu, Xiao Shen

引用次数: 0

Sustainable propane dehydrogenation reaction triggered by strong metal-support interaction

IF 10.4 1区化学

Science China Chemistry Pub Date : 2024-09-14 DOI: 10.1007/s11426-024-2274-3

Lichen Liu, Avelino Corma

引用次数: 0

XAFS method for the structural characterization of single atom catalysts 单原子催化剂结构表征的 XAFS 方法

IF 9.445 1区化学

Science China Chemistry Pub Date : 2024-09-14 DOI: 10.1007/s11426-024-2257-6

Houhong Song, Ziyu Song, Wenting Zhou, Siyu Yao

{"title":"XAFS method for the structural characterization of single atom catalysts","authors":"Houhong Song, Ziyu Song, Wenting Zhou, Siyu Yao","doi":"10.1007/s11426-024-2257-6","DOIUrl":"https://doi.org/10.1007/s11426-024-2257-6","url":null,"abstract":"<p>Single atom catalysts (SACs) have become a hot topic in catalysis research due to their 100% atomic utilization, unique coordination environment, and superior catalytic performance. To explain the special catalytic behavior of SACs and maximize the advantages of single atom configurations, understanding the structure-performance relationship of SACs at the atomic level is key to the research. X-ray absorption fine structure (XAFS) provides an irreplaceable method for characterizing SACs, which can be applied to almost all transition-metal SACs and can obtain rich structural information about atomistic structures and electronic properties. In this review, starting from the basic principles of XAFS technology, we discuss the application of extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectroscopy in the study of the local coordination, symmetry, hybrid of orbitals, oxidation state, charge transfer and many other structural and electronic properties. After that, we introduce the emerging advanced X-ray spectroscopy methods that improve characterization capabilities and compensate for the shortcomings of traditional XAFS methods in SAC research, and then discuss <i>in-situ</i> and <i>operando</i> experimental techniques for SAC characterization to monitor the dynamic structure of the active sites in the presence of reactants under reaction conditions.</p>","PeriodicalId":772,"journal":{"name":"Science China Chemistry","volume":"12 1","pages":""},"PeriodicalIF":9.445,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface ligand-promoted heterogeneous CO2 catalysis 表面配体促进异相二氧化碳催化

IF 10.4 1区化学

Science China Chemistry Pub Date : 2024-09-13 DOI: 10.1007/s11426-024-2205-y

Zhe Lu, Lu Wang

引用次数: 0

Light-activated tautomeric transition enhanced buried heterointerface for highly efficient and ultraviolet robust perovskite solar cells 光激活同分异构转换增强型埋藏异质界面，用于高效和紫外线稳健型过氧化物太阳能电池

IF 10.4 1区化学

Science China Chemistry Pub Date : 2024-09-13 DOI: 10.1007/s11426-024-2194-0

Sheng Jiang, Shaobing Xiong, Shuaifei Mao, Yefan Zhang, Dongyang Zhao, Xiaomeng You, Vladimir Gaishun, Dmitry Kovalenk, Qinye Bao

{"title":"Light-activated tautomeric transition enhanced buried heterointerface for highly efficient and ultraviolet robust perovskite solar cells","authors":"Sheng Jiang, Shaobing Xiong, Shuaifei Mao, Yefan Zhang, Dongyang Zhao, Xiaomeng You, Vladimir Gaishun, Dmitry Kovalenk, Qinye Bao","doi":"10.1007/s11426-024-2194-0","DOIUrl":"10.1007/s11426-024-2194-0","url":null,"abstract":"<div><p>The buried heterointerface of perovskite solar cells (PSCs) suffers from serious nonradiative recombination and ultraviolet (UV) light stress, relentlessly limiting further increase in their power conversion efficiency and operational stability. Herein, we develop an emerging strategy of incorporating a thin UV-activated tautomeric transition layer onto underlying charge transport layer and then depositing perovskite layer to construct an efficient hole-selective buried heterojunction. It is revealed that the UV-activated tautomeric transition interlayer not only improves upper perovskite crystallinity, diminishes thermionic loss for collecting hole and passivates defect site at such buried contact that significantly promote charge transport and suppress nonradiative recombination, but also effectively protects adjacent perovskite from UV degradation through “UV sunscreen” effect. As a result, we report a remarkably enhanced efficiency of 24.76% compared to 22.02% of the control device. More importantly, the achieved high-efficiency PSC features excellent resistance against UV radiation at 365 nm of 100 and 850 mW cm<sup>−2</sup>, which are approximately 21 and 184 times of UV flux (4.6 mW cm<sup>−2</sup>) under AM 1.5G solar illumination. This work provides a promising approach of strengthening buried heterointerface for simultaneous realization of highly efficient and UV robust PSCs.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":772,"journal":{"name":"Science China Chemistry","volume":"68 2","pages":"723 - 732"},"PeriodicalIF":10.4,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11426-024-2194-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tandem asymmetric dearomatized functionalization reaction of phenols with Evans-ynamides enabled by divergent electrophiles 利用发散亲电体实现苯酚与伊文炔酰胺的串联不对称脱芳烃官能化反应

IF 10.4 1区化学

Science China Chemistry Pub Date : 2024-09-13 DOI: 10.1007/s11426-024-2211-y

Ying-Qi Zhang, Gan-Lu Qian, Yun Liu, Jia-Hui Li, Xin Hong, Zhou Xu, Bo Zhou, Long-Wu Ye

引用次数: 0

Combating periodontitis with an ATP-responsive metal-organic framework through synergistic ion-interference-induced pyroptosis 通过协同离子干扰诱导的热渗透作用，利用 ATP 响应型金属有机框架防治牙周炎

IF 10.4 1区化学

Science China Chemistry Pub Date : 2024-09-12 DOI: 10.1007/s11426-024-2192-9

Yuling Xu, Mengrong He, Xuechuan Hong

引用次数: 0