ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Jiaqi Xu,Zongcai Deng,Bo Wu,Meijin Lin,Dongyang Chen
Organic polymers containing redox-active moieties have attracted increasing attention as electrode materials for high-performance rechargeable batteries due to their sustainability, flexibility, environmentally benign, and high stability. Herein, viologen functionalized fluorene-containing poly(arylene ether ketone)s (MV-FPAEKs) were synthesized by polycondensation , bromination, and quaternization in sequence. 1 H NMR was used to monitor the degree of functionalization (DF), which increased with the increasing of the molar ratio of the bromination agent. The MV-FPAEK-96 with a DF of 96% for viologen was used as the active material for polymer cathode. The theoretical specific capacity was calculated to be 87.6 mAh g −1 based on the dual electron transfer per viologen unit. It had been found that the MV-FPAEK-96 battery delivered a discharge specific capacity of 87.1 mAh g −1 at a current rate of 0.1 C, and maintained 32.1 mAh g −1 after 100 galvanostatic cycles. In contrast, the small molecule of dimethyl viologen was highly soluble in the electrolyte, and the corresponding capacity decreased to negligible values after only 20 cycles. Therefore, the attachment of viologen to polymeric backbones is an effective strategy to increase the stability in electrolyte while maintaining the rechargeability, and the MV-FPAEK-96 is a promising redox-active candidate for polymer batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Small
·
2023
·
IF 13.3
Jing Cuan,Hui Zhou,Xuefang Huang,Xinhang Cong,You Zhou
Developing smart materials capable of solid-state multicolor photoluminescence (PL) switching in response to multistimuli is highly desirable for advanced anticounterfeiting. Here, a ternary MOF hybrid showing hydro-photo-thermo-responsive multicolor PL switching in the solid state is presented. This hybrid is constructed by co-immobilizing Eu 3+ and methyl viologen (MV) cations within an anionic MOF via the cation-exchange approach. The confined guest cations are well arranged in the framework channels, facilitating the synergistic realization of stimuli-responsive multiple PL color-switching through intermolecular coupling. The hybrid undergoes a rapid and reversible PL color-switching from red to blue upon water simulation, which is achieved by activating the blue emission of the framework linker while simultaneously quenching the Eu 3+ emission. Furthermore, the hybrid displays photo-thermo-responsive PL switching from red to dark. UV-light irradiation or heating triggers the chromic conversion of MV to its colored radical form, which exhibits perfect spectral overlap with Eu 3+ , thus activating Förster resonance energy transfer (FRET) from Eu 3+ to MV radicals and quenching the Eu 3+ emission. Inspired by these results, PL morse patterns are designed and fabricated using a novel triple-level encryption strategy, showcasing the exciting potential of this hybrid in advanced anticounterfeiting applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Haixia Wang,Yan Xu,Dafu Xu,Long Chen,Qinqin Xiao,Xiaoqing Qiu
The rapid growth of industry inevitably leads to a large variety of organic pollutants in the aquatic environment. The design of a photoelectrochemical (PEC) sensor is significant to achieve the goal of sensitive quantitative determination of organic pollutant residues. In this work, the graphitic carbon nitride (g-C3N4) quantum dots (CNQDs) with high crystallinity were synthesized through the step-by-step cutting of bulk g-C3N4, which were modified with Cu(II) and then utilized to the fabrication of a PEC sensor for monitoring the typical organic pollutant methyl viologen in water. In the detection process, by means of the redox of Cu(II)/Cu(I), Cu(II) can effectively accelerate the photogenerated carriers’ separation of CNQDs, and facilitate the reduction of methyl viologen, contributing to the notable photocurrent signal. More importantly, the stable PEC sensor presents a perfect linearity between the change in photoelectric signal and logarithm of methyl viologen concentrations ranging from 0.1 to 200 ng mL–1. Thus, the constructed Cu-CNQDs 2% can be widely utilized in the quantitative determination of methyl viologen in real monitoring of environmental pollutants.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2022
·Vol. 157
·期 8
·
IF 4.304
Chen Zhongwei,Liu Yang,Gong Shaokuan,Zhang Zixuan,Cao Qinxuan,Mao Lingling,Chen Xihan,Lu Haipeng
Low-dimensional metal halide perovskites are attracting extensive attention due to their enhanced quantum confinement and stability compared to three-dimensional perovskites. However, low dimensional connectivity in the inorganic frameworks leads to strongly bounded excitons with limited absorption properties, which impedes their application in photovoltaic devices. Here, we show that, by incorporating a strong electron accepting methylviologen cation, charge transfer (CT) at the organic/inorganic interface can effectively tune the optical properties in one-dimensional (1D) lead–halide perovskites. Both 1D MVPb 2 I 6 and MVPb 2 Br 6 display expanded absorption and photoresponse activity compared to CT inactive cations. The photoinduced CT process in MVPb 2 I 6 was further characterized by transient absorption spectroscopy, which shows an ultrafast CT process within 1 ps, generating charge separated states. Our work unveils the interesting photophysics of these unconventional 1D perovskites with functional organic chromophores.
研究领域:
材料科学
·
光物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Agricultural Science & Technology
·
2022
·
IF 0
Guang Li,Siyun Zhang,Lei Yang,Weiwei Xu,Haonan Qu,Demei Tian,Jia Li,Haibing Li,Xiaobing Zhang
Controlled release of pesticides is highly desirable for improving efficacy and reducing side effects in agricultural applications. Herein, in this work, based on the optical property and host–guest chemistry of quantum dot and pillararene, we develop a new type of fluorescent, current-responsive, pH stimuli-responsive pillar[6]arene@quantum dots mixed-matrix membranes (PQDs-MMMs) for pesticide delivery, which achieves highly selective detection and controlled release for methyl viologen (MV2+). In the experiments of fluorescence spectrum and I–V current, PQDs-MMMs could realize the visual fluorescence detection and current selection for MV2+. Moreover, the controlled release experiments indicated that the PQDs-MMMs could effectively immobilize and stimuli-release the MV2+ depending on the pH regulation, which achieved the pH-stimuli-responsive release of MV2+. Additionally, the herbicidal activity of MV2+-loaded PQDs-MMMs (MV2+@PQDs-MMMs) was tested, and results showed the weed control effects were identified to free MV2+ under pH control. This work provides the great potential of PQDs-MMMs used in agricultural membranes with environmentally friendly and stimuli-responsive release.
研究领域:
农业科学
·
材料科学
·
化学
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jinxu Zhao,Qijun Chen,Ying Zhou,Jianming Zheng,Chunye Xu
The poor electrochemical reversibility of the dimers limits the application of viologens in aqueous electrochromic devices (ECDs). Here, we report a tetramethyl viologen, 2,2′,6,6′-tetramethyl-4,4′-bipyridine hydrobromide ([MVH][Br]), in which tetramethyl substitution provides significant steric hindrance to prevent dimerization. Our experiments show that this designed viologen performs excellently in an aqueous solvent, including excellent color variation, optical modulation, cycling stability, and radical inertness. Typically, an aqueous ECD fabricated with the viologen is able to retain 95.48% of its optical modulation after 5000 cycles. Furthermore, we found that this viologen is impervious to UV polymerization. Based on this property, we demonstrate a bichromatic ECD based on a hydro-ionic hybrid gel using in situ UV polymerization. This study not only extends the application of viologens in aqueous ECDs but also paves the way for the future development of high-mechanical-performance hydrogel-based ECDs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-10
·
IF 6.408
Luo Ying,Zhang Qian,Wang Qin,Liu Zhenglin,Duan Lingfeng,Cao Wenxi,Cao Zijin,Han Caiqin
Gold nanoparticles-modified silver nanorod (AuNPs@AgNR) arrays were fabricated as surface-enhanced Raman spectroscopy (SERS) substrates. The coffee ring effect of the AuNPs@AgNR was explored as a preconcentration method for enriching the target analytes and increasing the “hot spots.” Furthermore, methyl viologen (MV) as a toxic herbicide used in agricultural production was successfully determined to investigate the application of the coffee ring effect on AuNPs@AgNR arrays and density functional theory (DFT) was employed to calculate its vibrational modes of corresponding characteristic peaks. Good linearity was obtained in the range 0.10–100 mg/L, and the limit of detection (LOD) of MV was estimated to be 0.01 mg/L, which was lower than the US maximum residue limits (MRLs). This method was also applied to practical detection of MV in river water and apple peel with LODs of 0.10 mg/L and 0.05 mg/L, respectively. SERS results suggest that the coffee ring on AuNPs@AgNR arrays provides a promising way for monitoring environmental pollution and food safety caused by pesticides. Graphical Abstract
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yaxuan Qian,Zhuoran Jiang,Yan Long,Houguo Fei,Heng Song,Cunlan Guo
Electrochemistry enables numerous redox enzymatic reactions with high efficiency. Nitroaromatic molecules with diverse biological properties have been extensively applied in medicine. New strategies are continuously required for the nitration of aromatic molecules with improved yields and selectivity. Here, we report a reaction by combining electrochemistry and the enzyme ferredoxin-TxtE to drive the nitration of l-tryptophan (l-Trp). With methyl viologen as the electron mediator, such an electroenzymatic approach avoids the use of expensive β-nicotinamide adenine dinucleotide phosphate (NADPH) and results in a higher yield than the wild-type ferredoxin-NADP+ reductase-TxtE reaction. This electrochemically driven reaction also produces two nitro-l-Trp isomers, i.e., 4-nitro-l-Trp and 5-nitro-l-Trp, which can be regulated by an electric field and electron mediators. Moreover, when more polarized mediators are used, the selectivity is recovered to 4-nitro-l-Trp. The mechanistic study suggests that the selectivity of the electron mediators is attributed to the steric hindrance and polarity of bipyridiniums. This work affords a new catalytic strategy for the regulation and control of electroenzymatic catalysis, which is expected to extend the application of electroenzymatic reactions in synthesis, energy, and sensing fields.
研究领域:
电化学
·
酶学
·
有机化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Zipin Zhang,Rui Zhou,Yongliang Dong,Mengmeng Song,Lei Tian,Zuzhi Zhao
We have reported an optical indicator displacement assay (IDA) for heparin with a UV–vis absorbance and fluorescence dual-readout based on pyranine/methyl viologen (MV 2+ ). Upon introducing heparin, pyranine/MV 2+ shows a clearly observable increase in UV–vis absorbance and a turn-on of the fluorescence signal. We have demonstrated that the ionic nature of buffers significantly affects the pyranine displacement and the zwitterionic HEPES was most suitable for heparin sensing. After careful screening of experimental conditions, the pyranine/MV 2+ -based optical chemosensor exhibits a fast, sensitive, and selective response toward heparin. It shows dynamic linear concentration of heparin in the ranges of 0.1–40 U·mL −1 and 0.01–20 U·mL −1 for the absorptive and fluorescent measurements, respectively, which both cover the clinically relevant levels of heparin. As with the animal experiments, the optical chemosensor has been demonstrated to be selective and effective for heparin level qualification in rat plasma. The chemosensor is readily accessible, cost-effective, and reliable, which holds a great promise for potential application on clinical and biological studies. Furthermore, this IDA system can serve as an IMPLICATION logic gate with a reversible and switchable logical manner.
研究领域:
分析化学
·
生物化学
·
分子生物学
·
临床化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Zhang Die,Fu Boyang,He Weilong,Li Hengtao,Liu Fuyang,Wang Luhong,Liu Haozhe,Zhou Liujiang,Cai Weizhao
Dynamic crystals with directional deformations in response to external stimuli through molecular reconfiguration, are observed predominantly in certain organic crystals and metal complexes. Low-dimensional hybrid halides, resemble these materials due to the presence of strong hydrogen bonds between bulky organic moieties and inorganic units, whereas their dynamic behavior remains largely unexplored. Here we show that a one-dimensional hybrid halide (MV)BiBr 5 (MV = methylviologen) undergoes an isosymmetric phase transition at hydrostatic pressure of 0.20 GPa, accompanied by a remarkable length expansion of 20–30% and red to dark yellow color change. Unexpectedly, the backward transition can be fully reversed by mechanical stimulation rather than decompression. In the high-pressure phase, the coexistence of strong Bi 3+ lone pair stereochemical activity and large reorientations of the planar MV 2+ cations, together with the newly formed CH···Br hydrogen interactions, are the structural features that facilitate microscopic changes and stabilize the metastable high-pressure phase at ambient conditions.
研究领域:
材料科学
·
晶体学
·
固体化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yunpeng Gao,Xin Tian,Xueru Xiong,Yushi Wang,Wen Huang,Xuetao Shi,Yong-Guang Jia,Zhong-Kai Cui
The catechol moiety found within mussel proteins plays a pivotal role in enhancing their adhesive properties. Nonetheless, catechol compounds, such as dopamine (DOP) derivatives, are susceptible to oxidation, leading to the formation of q0uinone. This oxidation process poses a significant challenge in the development of DOP-based hydrogels, hampering their adhesion capabilities and hindering polymerization. To protect DOP moieties from oxidation, DOP and N-(3-aminopropyl)methacrylamide (AMA) moieties were grafted onto the side groups of biocompatible poly(glutamic acid) (PGA). Subsequently, the DOP unit, serving as a second guest, would be captured by a polymerizable rotaxane of cucurbituril (CB[n]), in which the host molecule CB[8] complexed with the first guest, polymerizable methyl viologen (MV), forming a protective function and dynamic cross-linking. Upon exposure to light curing, a composite network emerged through the synergy of covalent cross-linking and supramolecular host-guest complexation of DOP with CB[8]. The generated complexation between DOP and CB[8] could protect the DOP moieties, resulting in photocured hydrogels with exceptional adhesive strength and remarkable tensile capabilities. Moreover, 3D printing technology was used to create various models with these DOP-based hydrogels, demonstrating their promising applications in future.
研究领域:
材料科学
·
化学
·
生物医学工程
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2025
·Vol. 18
·期 15
·3624
·
IF 3.2
Yanwen Ren,Qianqian Zheng,Cuicui He,Jingjing Nie,Binyang Du
Aqueous organic redox flow batteries (AORFBs) represent an advancing class of electrochemical energy storage systems showing considerable promise for large-scale grid integration due to their unique aqueous organic chemistry. However, the use of small-molecule active materials in AORFBs is significantly limited by the issue of stability and crossover. To address these challenges, we designed a high-water-solubility polymer cathode material, P-T-S, which features a polyvinylimidazole backbone functionalized with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and sulfonate groups. P-T-S exhibits a solubility of 34 Ah L−1in water and 31 Ah L−1in 1.0 M NaCl aqueous solution (NaClaq). When paired with methyl viologen to assemble a pH-neutral AORFB with a theoretical capacity of 15 Ah L−1, the system exhibits a material utilization rate of 92.0%, an average capacity retention rate of 99.74% per cycle (99.74% per hour), and an average Coulombic efficiency of 98.69% over 300 consecutive cycles at 30 mA cm−2. This work provides a new design strategy for polymer materials for high-performance AORFBs.
研究领域:
储能
·
电化学
·
聚合物材料
·
可再生能源
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）