ELECTROCHIMICA ACTA
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2018
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IF 5.116
Guijuan Wei,Xixia Zhao,Kun Du,Yiwen Huang,Changhua An,Shujun Qiu,Miao Liu,Shuang Yao,Yue Wu
Flexible asymmetric supercapacitors (FASCs) have attracted increasing interest in portable and wearable electronics. The practical application of FASCs in high energy density devices is limited by their low specific capacity, which can be effectively addressed by designing electrode materials hierarchically on the micro-nanoscale. Herein, well-defined 3D porous hierarchical CuCo 2 O 4 @carbon quantum dots (CQDs) and Fe 2 O 3 @CQDs architectures are rationally synthesized through a simple CQDs-induced hydrothermal self-assembly technique. Both of the as-prepared CuCo 2 O 4 @CQDs and Fe 2 O 3 @CQDs electrodes exhibit improved specific capacity, desirable rate capability and complementary potential range. A FASC (CuCo 2 O 4 @CQDs//Fe 2 O 3 @CQDs) on graphite paper delivers a high operation voltage of 1.55 V, an energy density of 39.5 Wh kg −1 at 1203.7 W kg −1 , and long cycling lifespan. The excellent performance is ascribed to the good electronic conductivity with the assistance of CQDs and their unique 3D mesoporous structures with extraordinary specific surface area, which could provide fruitful active sites for electrochemical reactions . The newly developed FASC based on the Faradaic-type electrodes is inspiring, and would be promising for the applications in wearable electronic devices.
研究领域:
材料科学
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能源存储技术
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DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2025
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IF 4.6
Xin Tian,Jianru Chen,Ruobing Jiang,Haiyang Chen,Jielin Zhang,Jinlong Ren,Xihao Yu,Lina Liu,Chenchen Feng,Cuixia Li,Fucheng Yu,Kechao Hu,Xiaogang Hou
Hydroxylated carbon quantum dots (OH-CQDs) modified g-C 3 N 4 hollow microspheres were prepared using a supramolecular precursor self-assembly method. The incorporation of OH-CQDs into the precursor resulted in the formation of a hollow flower-like microsphere structure composed of g-C 3 N 4 nanoflakes in the final samples, which exhibited a morphology that was roughly inherited from that of the supramolecular precursor. The incorporation of an optimal quantity of OH-CQDs did not result in a deterioration of the g-C 3 N 4 product morphology; rather, it led to an enhancement in its microsphere structure. The modified nanostructure of g-C 3 N 4 resulted in a significant increase in reaction sites and promoted the adsorption of organic dye molecules on the surface of the g-C 3 N 4 photocatalyst during degradation reactions. Furthermore, despite the reduction in carrier concentration of g-C 3 N 4 resulting from the decoration with OH-CQDs, the impedance was significantly diminished and the photocurrent density was also markedly improved. It can thus be concluded that the decoration of OH-CQDs has significantly enhanced the mobility of g-C 3 N 4 , thereby contributing to the improvement of the photocatalytic performance of the g-C 3 N 4 photocatalyst.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2023
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IF 3.9
Jiamei Zhao,Qiangyi Deng,Ziyin Yang,Hongmei Zhang,Conglu Zhang
In this paper, a high-efficient visible light responsive g-C 3 N 4 /CaTiO 3 /CQDs Z-type heterojunction photocatalyst was successfully prepared by a two-step method for the photodegradation of organic pollutants in water. The combination of g-C 3 N 4 , CaTiO 3 and CQDs could produce synergistic effect, which facilitated the separation of carriers, thereby enhancing photocatalytic activity . The photocatalytic kinetic removal rate of g-C 3 N 4 /CaTiO 3 /CQDs for methylene blue could reach about 8 times of g-C 3 N 4 and 5.5 times higher than that of CaTiO 3 . The effects of co-existing ions, initial pH, water source, and humic acid on meloxicam degradation were examined. Repeatability experiments indicated that the composite had good reusability and stability with 81.1 % removal for meloxicam after four cycles. The main active substances of g-C 3 N 4 /CaTiO 3 /CQDs in free radical capture experiment was ⋅O 2 − . Possible degradation pathways of meloxicam were also analyzed. The results highlight the g-C 3 N 4 /CaTiO 3 /CQDs Z-type heterojunction is a desirable photocatalyst for removing organic pollutants in water.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Chunhua Liang,Chuantao Wang,Kaixuan Xu,Hongbin He,Qiangen Li,Chunming Yang,Xiaoming Gao
The benzaldehyde (BAD) produced by the benzyl alcohol (BA) oxidation method is comprehensively applied to food and pharmaceutical fields. However, the selectivity and conversion of photocatalytic selective oxidation of BA in aqueous solution are still far from expectation. Herein, N-CQDs/CdS composites were synthesized by the in-situ precipitation method. N-CQDs served as an "Electronic Warehouse" to boost the separation efficiency of the carrier. The electron transferred from CdS to N-CQDs made electron on the N-CQDs surface enrich, which was conducive to the formation of superoxide radicals (·O 2 - ).·O 2 - and h + could efficiently oxidize BA to BAD. In addition, according to density functional theory (DFT), the adsorption energies of BA and BAD on N-CQDs/CdS were distinctly greater than that of CdS. BAD tended to desorb from the 7.5 N-CQDs/CdS surface, and BA preferred to adsorb on the CdS surface. However, BAD was difficult to desorb from the CdS surface, resulting in the poisoning of CdS. 7.5 N-CQDs/CdS exhibited the BA conversion of 60.4% and BAD selectivity of 99%, which was 2.2 times higher than that of original CdS. This work was expected to provide a theoretical basis for improving photocatalyst carrier separation efficiency and alcohol selective oxidation performance.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
高影响因子
Analytical Methods
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2025
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IF 2.6
Jintao Yi,Zhenhua Wu,Nani Fu,Xianqin Han,Ting Yan,Jiaying Zheng
Amoxicillin (AMO), a broad penicillin antibiotic, has been widely employed for the treatment of bacterial infections. However, the unreasonable use of amoxicillin may cause a serious threat to human health and its visual determination remains a challenge. Herein, a MnO2@CQDs probe was used for the dual-mode detection of AMO, which was synthetized by CQDs doped in MnO2 nanosphere. In the colorimetric mode, MnO2@CQDs oxidized colorless 3, 3ʹ, 5, 5ʹ-tetramethylbenzidine (TMB) into yellow oxidized TMB (oxTMB). In the presence of AMO, the AMO could deoxidize oxTMB to cause multiple color changes from yellow to colorless. In the fluorescence mode, MnO2@CQDs initially exhibited quenched fluorescence due to the presence of MnO2. Upon the addition of AMO, MnO2 was reduced to Mn2⁺ ions, then CQDs were released and recovered fluorescence at the emission wavelength of 450 nm. The colorimetry detection range was wide from 0.005 to 0.09 μM, and the detection limit was 1.6 nM. With increasing concentration of AMO, the color changed from yellow to colourless which allowed naked eye observation. The fluorescence method was rapid, requiring only 1 min, and exhibited a linear detection range from 0.003 to 0.045 μM, with a detection limit as low as 1 nM. In addition, a paper-based sensing platform was constructed, where fluorescence intensity transitioned from dark to blue with increasing AMO levels. The RGB analysis demonstrated that AMO concentration could be discriminated effectively using a smartphone-assisted detection system. The MnO2@CQDs sensor showed excellent selectivity and specificity for AMO colorimetric and fluorescence detection. Moreover, the probe exhibited good practicability in tap water, milk and serum, with results comparable to those obtained by high-performance liquid chromatography. Overall, the MnO2@CQDs dual-mode probe provides an efficient, convenient and rapid strategy for the visual and quantitative detection of AMO in complex environments.
研究领域:
分析化学
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环境监测
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食品安全
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生物传感
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纳米材料
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2024
·Vol. 59
·期 41
·19492-19507
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IF 3.5
Gao Yan,Zhu Sipin,Wang Zhaopeng,Chen Guimei,Wang Chunying
Bi 2 O 3 is an excellent visible light photocatalyst. However, the structural instability limits its activity and engineering application. To enhance the activity and stability, the composite of CQDs and Bi 2 O 3 was constructed by solvothermal method, and the physical–chemical properties of prepared composite were characterized using XRD, TEM, XPS, FTIR and TPC. As the target pollutant, bisphenol A (BPA) was used to investigate the photocatalytic activity and the stability of CQDs@Bi 2 O 3 by photodegradation experiment under the irradiation of simulated visible light, and butyl xanthate was used to prove the applicability by mung bean sprouts. As the results, the existence of CODs obviously promoted the photocatalytic activity of Bi 2 O 3 :10% CQDs@Bi 2 O 3 could remove 93.7% of BPA in 120 min, and the reaction constant rate was almost 1.5 time of pure Bi 2 O 3. Moreover, 10%CQDs@Bi 2 O 3 could effectively remove butyl xanthate and greatly reduce the growth toxicity on mung bean sprouts. After doping with CQDs, the electron transfer path on the surface of the catalyst could effectively inhibit the electron–hole composite and improve the stability of the composite to a certain extent.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yanhui Niu,Wenshuo Zhang,Huiyun Xia,Ningning Li,Lifang Song,Xu Li,Liying Cui
As well known, the apparent structure and chemical composition of self-cleaning photocatalytic coatings are crucial for their application. In this study, C 3 N 4 with a large specific surface area was introduced into N-CQDs/Bi 2 WO 6 to construct a highly catalytic active catalyst (CBW-0.5), which continuously degraded 57.7 % of NO. A robust self-cleaning photocatalytic coating (CCBW-B) was prepared by firmly bonding CBW-0.5 to the substrate through a layered spraying process. CBW-0.5 endowed CCBW-B with high catalytic activity, maintaining a degradation rate of 64.9 % for NO, and most of the surface organic dye contamination was degraded after 36 h. Due to the appropriate arrangement of low surface energy substances and micro/nano particles on the surface, CCBW-B with a graded cross network on the surface has contact angles (CA) of 156°/145° for water/olive oil, respectively. The influence of each component of CCBW-B on its photocatalytic and liquid repellent ability was studied, and the patterns for the differences in coating performance due to the changes in surface roughness structure caused by different layer distributions was discussed. In addition, the mechanism for the excellent performance of CCBW-B was explored using SEM, specific surface area, and the theory of the generation and distribution of air pockets. Finally, the durability and self-cleaning ability of CCBW-B were tested, and the synergistic mechanism of self-cleaning and photocatalysis was also provided.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
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2024
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IF 6.5
Xinyue Yang,Yong Li,Deyun Yue,Rui Li,Haojie Song
The construction of ternary heterojunction photocatalysts can achieve multi-gradient transfer of charges and accurate control the position of photogenerated electrons which has received increasing attention. In this paper, NH 2 -MIL-53(Al)@BiOBr@CQDs-10 % (ABCQDs-10 %) was prepared via a facile hydrothermal and chemical synthesis processes. Three-dimensional serration of NH 2 -MIL-53(Al) as a platform for irregular BiOBr nanosheets, CQDs promote interfacial contact and act as electron transport channels between BiOBr and NH 2 -MIL-53(Al) and constitute Z-type heterojunctions with high redox properties. ABCQDs-10 % shows the best photocatalytic removal efficiency (94.24 %) of CIP, the reaction rate constants (0.045 min −1 ) were 1.2 and 64 times higher than BiOBr and NH 2 -MIL-53(Al), respectively. The excellent degradation performance is attributed to the construction of Z-type heterojunction of NH 2 -MIL-53(Al)@BiOBr@CQDs which improve electron-hole separation and transfer efficiency. The main active species was •O 2 - . The photocatalytic activity of ABCQDs-10 % had not obvious loss after cycle experiments and the crystal structure had no significant changes, means high stable photocatalytic activity.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Ming Zhang,Jing Wang,Wentao Wang,Jun Zhang,Ninglin Zhou
Carbon dots could be extended in biological applications for drug delivery and photothermal therapeutics due to their ability to improving therapeutic effect and reducing side effects. Here, we use doxorubicin (DOX) as the model drug, the amino and carboxyl coated magnetofluorescent carbon quantum dots (GdN@CQDs) as a carrier, Genipin (GP) as cross-linking agent to design and prepare a multifunctional drug delivery system triggered by near-infrared (NIR) light and pH dual-stimuli. The cytotoxicity of the nanoparticles has been examined by MTT assay. The fluorescent GdN@CQDs/GP serves as both a controllable drug release gatekeeper and a fluorescent probe for the visualization of the drug delivery process. In vitro and in vivo experiments showed that this platform can deliver anti-cancer drugs to cells, releasing them intracellular upon NIR irradiation, and effectively eliminate tumors through chemo-photothermal synergistic therapeutic effect.
研究领域:
生物医学工程
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纳米医学
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药物递送系统
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2017
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IF 3.034
Jingrong Zhou,Yunfei Tian,Xi Wu,Xiandeng Hou
Photochemical vapor generation (PCVG) is a green and effective sampling technology for analytical atomic spectrometry , and in recent years it has been received continuous attention. In this work, visible light photochemical vapor generation was achieved with metal-free g-C 3 N 4 /CQDs (carbon nitride/carbon quantum dots) composites as a photocatalyst, and used for selective and ultrasensitive detection of total mercury by inductively coupled plasma mass spectrometry (ICP-MS). The limit of detection can be as low as 8 ng L − 1 , making it one of the most sensitive methods for mercury determination . The visible light photochemical vapor generation can also be coupled to other analytical atomic spectrometric techniques.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Yi Zheng,Qiuya Zhang,Haoran Chi,Yize Liu,Hongwei Ren
As a typical pollutant in petrochemical wastewater, naphthenic acids are highly ecotoxic and difficult to biodegrade due to its robust structure. The advanced oxidation process has always been the research hotspot for naphthenic acids degradation and removal. In this work, with low cost and biomass fructose as raw material, Si-doped carbon quantum dots (Si-CQDs) and its composite material (MoS 2 /Si-CQDs) of Flower-like molybdenum disulfide (Flower-like MoS 2 ) were targeted synthesized by hydrothermal method, and characterized by Transmission electron microscope, Scanning electron microscope, X-Ray diffraction, UV-Vis spectroscopy, and Raman spectrum. To study the activation of prepared materials in naphthenic acid oxidative degradation, the influencing factors of kinds of materials, reaction temperature, the dosage of catalyst and persulfate were all explored systematically. The experiments showed that the naphthenic acid degradation rate of MoS 2 /Si-CQDs@NaPS system could reach more than 99 % in 120 min, and the relationship between the naphthenic acid degradation rate and the reaction temperature was in accordance with the quasi-primary kinetic equation. In mechanistic studies, the role of free radical and non-free radical pathways in oxidative degradation was verified. After five reuse cycles, the catalyst can still achieve a degradation rate of over 80 %. Finally, the experiment also tested the effectiveness of MoS 2 /Si-CQDs@NaPS system in real naphthenic acids wastewater, and the production cost of its removal of naphthenic acids was economically analyzed, showing that MoS 2 /Si-CQDs is a promising composite with stability and cost-effectiveness, and provides a new material for naphthenic acid degradation that can achieve a dual degradation pathway.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 10
·752
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IF 4.3
Chang Feng,Yufeng Chen,Weie Wang,Yanan Niu,Xi Cao,Yuguang Lv
g-C3N4, a biocompatible material, has prominent applications in biology and is ideal for nano-enzyme studies. Though reported as a peroxidase mimic, its activity remains low. This group combined N,S-doped carbon quantum dots (NS-CQDs) with g-C3N4(7NSC-g), verifying its peroxidase-like activity. Based on this, a ternary composite of Co3O4in different forms and 7NSC-g was developed to enhance peroxidase activity, to design a g-C3N4-based composite enzyme. Characterizations determined the composition and morphology. Colorimetry evaluated peroxidase activity, where the simulated enzyme catalyzes blue product formation from the TMB substrate in the presence of H2O2. UV-Vis spectrophotometry measured absorbance changes to determine target concentrations. The results show Co3O4doping improves catalytic activity, with larger specific surface area providing more activation sites. The highest activity of g-C3N4/NS-CQDs/Co3O4was at 5% floral Co3O4, being efficient due to Co3O4’s electron-transfer acceleration and hydroxyl-radical mechanism. Under optimal conditions, the composite detected H2O2(10.0–230.0 μM, detection limit of 0.031 μM) and glucose (10.0–650.0 μM, detection limit of 1.024 μM).
研究领域:
生物化学
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材料科学
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医学检测
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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）