Precision Chemistry最新文献

Improving the Cold-Start Performance of Proton Exchange Membrane Fuel Cells via Precision Engineering of Key Materials 关键材料精细化工程提高质子交换膜燃料电池冷启动性能

Precision Chemistry Pub Date : 2025-03-14 DOI: 10.1021/prechem.4c0007910.1021/prechem.4c00079

Zhiyuan Ge, Shuying Xu, Xiaoyang Fu* and Zipeng Zhao*,

{"title":"Improving the Cold-Start Performance of Proton Exchange Membrane Fuel Cells via Precision Engineering of Key Materials","authors":"Zhiyuan Ge, Shuying Xu, Xiaoyang Fu* and Zipeng Zhao*, ","doi":"10.1021/prechem.4c0007910.1021/prechem.4c00079","DOIUrl":"https://doi.org/10.1021/prechem.4c00079https://doi.org/10.1021/prechem.4c00079","url":null,"abstract":"Proton exchange membrane fuel cells (PEMFCs) have emerged as important zero-emission power sources due to their efficiency and eco-friendly characteristics. A critical feature required for their widespread adoption is the performance of low-temperature cold start. However, at subzero degrees Celsius, the freezing of the produced water can hinder or even lead to failure of the fuel cell start-up process. To successfully achieve a cold start under such conditions, the PEMFC must rapidly and reliably transition from a fully cooled state to a stable operating condition. Various improvements have been focused on the system engineering aspect to address this challenge, yet many of these methods come with their drawbacks. This paper reviews the recent progress of the PEMFC cold start from the perspective of key materials engineering. It provides a detailed summary of how the proton exchange membrane (PEM), catalyst layer, microporous layer (MPL), and gas diffusion layer (GDL) affect the cold-start performance. Further analysis reveals that the fundamental mechanisms of improving cold-start performance can be summarized into three aspects: increasing the ratio of water bound in the ionomer, hindering the transformation process from supercooled water to ice, improving the removal of supercooled water, or ensuring it is transported to the outside of the membrane electrode assembly (MEA) before it gets frozen. By precisely regulating these key components, it is possible to develop a simple and energy-efficient solution for improving the cold start performance of the PEMFC.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 4","pages":"172–186 172–186"},"PeriodicalIF":0.0,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/prechem.4c00079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878332","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

Correction to “Stepwise Chemical Reduction of [4]Cyclo[4]helicenylene: Stereo Transformation and Site-Selective Metal Complexation” 对“[4]环[4]螺旋炔的逐步化学还原：立体转化和选择性金属络合”的修正

Precision Chemistry Pub Date : 2025-03-13 DOI: 10.1021/prechem.5c0002710.1021/prechem.5c00027

Zheng Zhou*, Yong Yang*, Jianwei Liang, Sota Sato, Zhenyi Zhang and Zheng Wei,

引用次数: 0

The Art of Building Small. 小建筑的艺术。

Precision Chemistry Pub Date : 2025-03-12 eCollection Date: 2025-03-24 DOI: 10.1021/prechem.5c00023

Ben L Feringa

引用次数: 0

The Art of Building Small 小型建筑的艺术

Precision Chemistry Pub Date : 2025-03-11 DOI: 10.1021/prechem.5c0002310.1021/prechem.5c00023

Ben L. Feringa,

引用次数: 0

Photoresponsive Coatings by Light-Driven Molecular Motors in Cholesteric Liquid Crystal Microcapsules 胆甾型液晶微胶囊的光响应涂层

Precision Chemistry Pub Date : 2025-03-05 DOI: 10.1021/prechem.4c0010310.1021/prechem.4c00103

Yan Wang, Yang Zhang, Shuhua Li, Wang Sun, Zhen Zhang, Guofu Zhou, Ben L. Feringa* and Jiawen Chen*,

{"title":"Photoresponsive Coatings by Light-Driven Molecular Motors in Cholesteric Liquid Crystal Microcapsules","authors":"Yan Wang, Yang Zhang, Shuhua Li, Wang Sun, Zhen Zhang, Guofu Zhou, Ben L. Feringa* and Jiawen Chen*, ","doi":"10.1021/prechem.4c0010310.1021/prechem.4c00103","DOIUrl":"https://doi.org/10.1021/prechem.4c00103https://doi.org/10.1021/prechem.4c00103","url":null,"abstract":"Photoresponsive coatings that can change their color in response to light at ambient temperature have large potential applications. Cholesteric liquid crystals (CLCs) are promising photochromic materials, as they are known to reflect light selectively and their optical properties can be modulated with a wide range. However, it remains a major challenge to fabricate photoresponsive coatings that combine fast and good responsivity, fabrication feasibility, and mechanical strength and, more importantly, that can be applied at a large area with excellent stability. In this study, Pickering emulsions containing CLC microdroplets doped with light-driven molecular motors as photoresponsive chiral dopants were prepared via cellulose nanocrystals (CNCs) which serve as both Pickering emulsifiers and alignment agents of CLCs. A melamine–formaldehyde (MF) resin hybrid shell was fabricated via in situ polymerization to form thermally stable CLC microcapsules. These microcapsules were mixed with curable binders, resulting in photoresponsive coatings. The photochromic material which features highly selective addressability of the reflective light wavelength in the visible light region, good reversibility, and viewing angle independence was painted in a large area on both hard and soft substrates, providing a versatile platform for enhanced encryption and smart coatings.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 3","pages":"149–156 149–156"},"PeriodicalIF":0.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/prechem.4c00103","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143675680","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

Photoresponsive Coatings by Light-Driven Molecular Motors in Cholesteric Liquid Crystal Microcapsules. 胆甾型液晶微胶囊的光响应涂层。

Precision Chemistry Pub Date : 2025-03-05 eCollection Date: 2025-03-24 DOI: 10.1021/prechem.4c00103

Yan Wang, Yang Zhang, Shuhua Li, Wang Sun, Zhen Zhang, Guofu Zhou, Ben L Feringa, Jiawen Chen

{"title":"Photoresponsive Coatings by Light-Driven Molecular Motors in Cholesteric Liquid Crystal Microcapsules.","authors":"Yan Wang, Yang Zhang, Shuhua Li, Wang Sun, Zhen Zhang, Guofu Zhou, Ben L Feringa, Jiawen Chen","doi":"10.1021/prechem.4c00103","DOIUrl":"10.1021/prechem.4c00103","url":null,"abstract":"Photoresponsive coatings that can change their color in response to light at ambient temperature have large potential applications. Cholesteric liquid crystals (CLCs) are promising photochromic materials, as they are known to reflect light selectively and their optical properties can be modulated with a wide range. However, it remains a major challenge to fabricate photoresponsive coatings that combine fast and good responsivity, fabrication feasibility, and mechanical strength and, more importantly, that can be applied at a large area with excellent stability. In this study, Pickering emulsions containing CLC microdroplets doped with light-driven molecular motors as photoresponsive chiral dopants were prepared via cellulose nanocrystals (CNCs) which serve as both Pickering emulsifiers and alignment agents of CLCs. A melamine-formaldehyde (MF) resin hybrid shell was fabricated via in situ polymerization to form thermally stable CLC microcapsules. These microcapsules were mixed with curable binders, resulting in photoresponsive coatings. The photochromic material which features highly selective addressability of the reflective light wavelength in the visible light region, good reversibility, and viewing angle independence was painted in a large area on both hard and soft substrates, providing a versatile platform for enhanced encryption and smart coatings.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 3","pages":"149-156"},"PeriodicalIF":0.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11938165/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143731915","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

The Trend of Nonenzymatic Nucleic Acid Amplification: Strategies and Diagnostic Application 非酶核酸扩增的趋势：策略和诊断应用

Precision Chemistry Pub Date : 2025-03-03 DOI: 10.1021/prechem.4c0010010.1021/prechem.4c00100

Junyou Li, Ting Li, Zheng Zou and Hung-Wing Li*,

{"title":"The Trend of Nonenzymatic Nucleic Acid Amplification: Strategies and Diagnostic Application","authors":"Junyou Li, Ting Li, Zheng Zou and Hung-Wing Li*, ","doi":"10.1021/prechem.4c0010010.1021/prechem.4c00100","DOIUrl":"https://doi.org/10.1021/prechem.4c00100https://doi.org/10.1021/prechem.4c00100","url":null,"abstract":"Nonenzymatic nucleic acid amplification reactions, especially nonenzymatic DNA amplification reactions (NDARs), are thermodynamically driven processes that operate without enzymes, relying on toehold-mediated strand displacement (TMSD) and branch migration. With their sensitive and efficient signal amplification capabilities, NDARs have become essential tools for biomarker detection and intracellular imaging. They encompass four primary amplification methods: catalytic hairpin assembly (CHA), hybridization chain reaction (HCR), DNAzyme-based amplification, and entropy-driven circuits (EDC). Based on amplification mechanisms, NDARs can be categorized into three types: stimuli-responsive NDARs, which employ single amplification strategies triggered by specific stimuli like pH, light, or biomolecules; cascade NDARs, which integrate two or more amplification reactions for stepwise signal enhancement; and autocatalytic NDARs, which achieve exponential amplification through self-sustained cycling. These advanced designs progressively improve amplification efficiency, enhance sensitivity, and minimize background noise, enabling precise detection of proteins, viruses, and nucleic acids as well as applications in cancer cell imaging and therapy. Compared with classical NDARs, these approaches significantly reduce signal leakage, offering broader applicability in diagnostics, imaging, and therapeutic contexts. This review summarizes recent advancements, addresses existing challenges, and explores future directions, providing insights into the development and applications of NDARs.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 4","pages":"187–205 187–205"},"PeriodicalIF":0.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/prechem.4c00100","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878358","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

Dual Free Radical Synergism for Enhancing Proton Conductivity in Photochromism iHOFs 双自由基协同作用增强光致变色iof中质子电导率

Precision Chemistry Pub Date : 2025-02-20 DOI: 10.1021/prechem.4c0010210.1021/prechem.4c00102

Cheng Liu, Xu-Yong Chen*, Xiao-Jie Cao, Wenmin Zhang and Li-Hui Cao*,

{"title":"Dual Free Radical Synergism for Enhancing Proton Conductivity in Photochromism iHOFs","authors":"Cheng Liu, Xu-Yong Chen*, Xiao-Jie Cao, Wenmin Zhang and Li-Hui Cao*, ","doi":"10.1021/prechem.4c0010210.1021/prechem.4c00102","DOIUrl":"https://doi.org/10.1021/prechem.4c00102https://doi.org/10.1021/prechem.4c00102","url":null,"abstract":"Stimuli-responsive smart materials, as an emerging material, can fulfill reversible transformation of chemical/physical properties under external stimuli such as mechanical stress, light, and electricity, which has the highlights of rapid response, designable structure, and function. Two ionic hydrogen-bonded organic frameworks (iHOFs 36–37) were synthesized by self-assembly of bis(benzene-o/p-sulfonic acid)-naphthalenediimide (o/p-H2BSNDI) and two basic ligands. The naphthalenediimide (NDI) was introduced into the material to equip iHOFs 36–37 with radical-driven photochromic behavior. The proton conductivity of iHOF-37 demonstrated a maximum of 6.50 × 10–4 S·cm–1 at 98% RH and 100 °C, and it increased to 9.10 × 10–3 S·cm–1 due to dual free radical synergism following UV irradiation (NDI and viologen), which represents a significant 14-fold enhancement. Furthermore, the incorporation of iHOF-37 into the chitosan (CS) matrix forms photochromic composite membranes. The proton conductivity of the 5%-iHOF-37/CS composite membrane reached up to 5.70 × 10–2 S·cm–1 at 98% RH and 90 °C, and reached 8.08 × 10–2 S·cm–1 after UV irradiation. This work reveals the dual radicals generated by NDI and viologen derivatives, whose synergistic action plays a significant role in enhancing the proton conductivity in iHOFs and composite membranes, rendering the rational design of stimuli-responsive smart materials feasible.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 4","pages":"221–230 221–230"},"PeriodicalIF":0.0,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/prechem.4c00102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878401","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

HCl Treatment of Mixed-Phase MoVTeNbOx Catalysts for Enhanced Performance in Selective Oxidation of Propane 混合相MoVTeNbOx催化剂的HCl处理提高丙烷选择性氧化性能

Precision Chemistry Pub Date : 2025-01-30 DOI: 10.1021/prechem.4c0008910.1021/prechem.4c00089

Zeyue Wei, Hanzhi Zhang, Yunxing Bai, Xuanyu Zhang and Weixin Huang*,

{"title":"HCl Treatment of Mixed-Phase MoVTeNbOx Catalysts for Enhanced Performance in Selective Oxidation of Propane","authors":"Zeyue Wei, Hanzhi Zhang, Yunxing Bai, Xuanyu Zhang and Weixin Huang*, ","doi":"10.1021/prechem.4c0008910.1021/prechem.4c00089","DOIUrl":"https://doi.org/10.1021/prechem.4c00089https://doi.org/10.1021/prechem.4c00089","url":null,"abstract":"Hydrothermally synthesized mixed-phase MoVTeNbOx catalysts are active for catalyzing the selective oxidation of propane to acrylic acid but suffer from the presence of the amorphous phase and low specific surface areas. Herein we report that HCl treatment preferentially dissolves the amorphous phase in hydrothermally synthesized mixed-phase MoVTeNbOx catalysts and increases the catalytic performance. An optimal HCl treatment significantly increases the C3H8 conversion from 38.9% to 58.2% without changing the acrylic acid selectivity in the selective oxidation of propane to acrylic acid at 380 °C. The original and HCl treated catalysts exhibit similar apparent activation energies, while HCl treatment increases the specific surface area, surface acid sites, surface V5+ density, and C3H8 and C3H6 irreversible adsorption amounts but decreases the C3H8 and C3H6 irreversible adsorption heats. The C3H8 conversion rate is proportional to the surface V5+ density and C3H8 irreversible adsorption amount, and the TOF is measured as 3.31 ± 0.08 × 10–5 s–1 at 340 °C. Thus, HCl treatment enhances the catalytic performance of mixed-phase MoVTeNbOx catalysts mainly by increasing the active site density rather than by increasing the active site activity. Our results provide an effective approach to prepare highly active mixed-phase MoVTeNbOx catalysts for the selective oxidation of propane to acrylic acid.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 4","pages":"206–213 206–213"},"PeriodicalIF":0.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/prechem.4c00089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878420","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

Precision Intercalation of Organic Molecules in 2D Layered Materials: From Interface Chemistry to Low-Dimensional Physics 有机分子在二维层状材料中的精确嵌入：从界面化学到低维物理

Precision Chemistry Pub Date : 2025-01-10 DOI: 10.1021/prechem.4c0008410.1021/prechem.4c00084

Yang Liu, Ziren Wang, Guoliang Hu, Xiaomeng Chen, Ke Xu, Yuqiao Guo*, Yi Xie and Changzheng Wu*,

{"title":"Precision Intercalation of Organic Molecules in 2D Layered Materials: From Interface Chemistry to Low-Dimensional Physics","authors":"Yang Liu, Ziren Wang, Guoliang Hu, Xiaomeng Chen, Ke Xu, Yuqiao Guo*, Yi Xie and Changzheng Wu*, ","doi":"10.1021/prechem.4c0008410.1021/prechem.4c00084","DOIUrl":"https://doi.org/10.1021/prechem.4c00084https://doi.org/10.1021/prechem.4c00084","url":null,"abstract":"The past few decades have witnessed significant development in intercalation chemistry research aimed at precisely controlling material properties. Intercalation, as a powerful surface and interface synthesis strategy, facilitates the insertion of external guests into van der Waals (vdW) gaps in two-dimensional (2D) layered materials, inducing various modulation effects (the weakening of interlayer interactions, changes in electronic structures, interfacial charge transfer, and symmetry manipulation) to tailor material properties while preserving intralayer covalent bonds. Importantly, benefiting from the very diverse structures and properties of organic molecules, their intercalation enables the integration of various molecules with a wide array of 2D materials, resulting in the creation of numerous organic–inorganic hybrid superlattices with exotic properties, which brings extensive potential applications in fields such as spintronics, superconductor electronics, optoelectronics, and thermoelectrics. Herein, based on recent advancements in organic intercalation systems, we briefly discuss a summary and classification of various organic guest species. We also discuss three modulation effects induced by organic intercalation and further introduce intriguing modulations in physicochemical properties, including superconductivity, magnetism, thermoelectricity and thermal conductivity, chiral-induced spin selectivity (CISS) effects, and interlayer-confined chemical reaction. Finally, we offer insights into future research opportunities and emerging challenges in organic intercalation systems.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 2","pages":"51–71 51–71"},"PeriodicalIF":0.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/prechem.4c00084","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143473674","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