International Journal of Electrochemical Science
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2023
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IF 1.5
Kai Zhang,Liangzi Wang,Jingitao liu,Shiyu Zhao,Longfei Ding,Binhua Zhou,Bo Zhao
Despite the harmful effects of organophosphorus pesticides (OPPs), few rapid detection methods of OPPs multi-residue have been practically applied; thus, it is important to improve existing methods and develop rapid detection methods and techniques. Reduced graphene oxide-chitosan (RGO-CHI)/methamidophos electrochemical biosensor was developed to detect multiple OPPs based on the principle of acetylcholinesterase (AChE) activity inhibition in the presence of OPPs. One OPP (methamidophos) that can combine with AChE in the incubation solution was immobilized on the electrode. The proposed method shows good linear relationships of nine OPPs and methomyl, a carbamate pesticide, with limits of detection between 0.05 and 0.52 ppb, indicating high accuracy for the application in real sample detection.
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高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Lin Zhang,Ting Wang,Xinxia Fan,Dongmei Deng,Yuanyuan Li,Xiaoxia Yan,Liqiang Luo
Theophylline (TP) and caffeine (CF) are two purine alkaloids which widely exist in our human diet. In the present work, poly(L-phenylalanine)-reduced graphene oxide (P(L-Pal)/rGO) modified glassy carbon electrode (GCE) was fabricated and applied to simultaneously determine the concentrations of TP and CF. The P(L-Pal)/rGO composite film was prepared by one-step electropolymerization using cyclic voltammetry, and the surface morphology was investigated by scanning electron microscope. The electrochemical behaviors of TP and CF on P(L-Pal)/rGO/GCE were investigated using cyclic voltammetry and differential pulse voltammetry. By optimizing parameters, the fabricated sensor exhibited excellent performance to simultaneously determine TP and CF in a wide linear range of 1−260 μM. The detection limits were 0.35 and 0.5 μM (S/N = 3), respectively. The presented method shows good sensitivity and stability, and can be used for the determination of TP and CF in samples of green tea, coffee and tablets.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Meng Ding,Xixun Shen
A GO/MPTS coating on a Zn coating electrodeposited on carbon steel was prepared by immersing zinc samples into suspension of graphene oxide/(3-mercaptopropyl) methyldimethoxysilane GM and then drying at 80°C. The silanol groups reacted with oxygen-containing functional groups on the GO during the hydrolysis process, and the GO was stacked layer by layer to construct a dense organic coating over the etched zinc surface. The synthesized GM coatings were characterized by FTIR, XRD, Raman spectroscopy and SEM. The corrosion behaviour of the galvanized carbon steel (GCS) and GCS coated with a GM composite coating exposed to a 3.5% NaCl solution were studied by potentiodynamic polarization and EIS. The results confirm that the GM coating can effectively protect GCS. Combined with the physical characterization of the GM-coated GSC explaines its markedly increased corrosion resistance.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Mengting Zhu,Ruli Xu,Xueyang Wang,Jie Liu Qianli Zhang,Jie Wei
Four Fe-based metal-organic frameworks (MIL-101(Fe), MIL-53(Fe), MIL-88(Fe), and MIL-100(Fe)) were synthesized using a solvothermal method, and further characterized by X-ray diffraction, Fourier transforms infrared spectroscopy, Scanning electron microscopy, and X-ray photoelectron spectroscopy. The synthesized Fe-MOFs were used to fabricate the modified carbon paste electrodes (CPE) for simultaneous detection of hydroquinone and catechol. Among the MILs (Fe) modified CPEs, MIL-101(Fe)/CPE exhibited extraordinary electrochemical sensitivity because of MIL-101 (Fe)’s excellent conductivity. The oxidation potential separation of hydroquinone and catechol achieved 190 mV. Compared with CPE, the oxidation currents of hydroquinone and catechol at MIL-101/CPE were 10-fold higher and the reduction currents were 5-fold higher. The linear range was 2 - 90 μM for hydroquinone and 2 - 100 μM for catechol, and the detection limit was 0.58 μM and 0.62 (S/N = 3) μM for hydroquinone and catechol. Furthermore, the application of MIL-101 (Fe)/CPE has been validated in an actual river water sample with the satisfied recoveries of 90.21 - 102.36% and 91.11 - 102.19% for hydroquinone and catechol, respectively.
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INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Rui Lou,Lingxuan Bai,Wei Zhang,Guiyun Huang,Zhe Zhang,Mingfang Wu,Can Wang,Hui Cai,Jiulong Sha
The urgent demand for stable, consistent, eco-friendly, and reliable power sources ultimately promotes the creation of new green energy materials. Due to their singular capacity of achieving efficient energy conversion between heat and power, nanoporous carbon-based thermally chargeable supercapacitors (TCS) have drawn interest due to their multiple applications in gathering of low-grade and waste heat. High-performance TCS is significantly influenced by the amount of active surface area and distribution of pore sizes of the electrode materials. Herein, the optimized porous flowery carbon made from enzymatic lignin has a high specific surface area of up to 897 m 2 g −1 , which gives it a promising thermal charging performance and the superior capacity to accommodate a large number of ions. With a temperature differential of 45 °C (K), the TCS using this carbonized flowery lignin electrode is capable of producing an open-circuit voltage of 513 mV with a Seebeck coefficient as high as 11.40 mV K −1 . This work not only demonstrates the applicability of carbonized lignin as an advanced material for energy applications but it also offers a fresh viewpoint on the advancement of TCS.
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ANALYTICA CHIMICA ACTA
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2023
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IF 6.2
Yanan Wang,Yali Liu,Xiao Wang,Xiyue Cao,Jianfei Xia,Zonghua Wang
In this work, a wearable and flexible three-electrode electrochemical sensing system (TESS) by using a two-in-one enzyme-mimic working electrode (TIOWE) is reported. The integrated three-electrode, including working electrodes, reference electrodes, and counter electrodes are formed by transfer printing of Ni 2 P-based composite electrode ink (Ni 2 P/G ink), Ag/AgCl ink, and carbon ink onto PDMS substrate, respectively. The Ni 2 P/G ink-based working electrodes have both good conductivity and enzyme-mimic catalytic activity towards glucose. Under optimized conditions, the TIOWE-TESS has a low detection limit of 0.37 μM and wide linear ranges of 0.001 mM–0.1 mM and 0.1 mM–1.4 mM. Furthermore, the TIOWE-TESS has good applicability in serum samples and reveals remarkable electrochemical performance at fluctuant working temperatures. The proposed TIOWE-TESS can be integrated on a waterproof bandage to fabricate a skin-friendly patch device for sweet glucose monitoring, which highlights its potential applications in flexible and wearable commercial devices for health-monitoring.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Adeel Ahmed,Muhammad Usman,Zhijian Ji,Muhammad Rafiq,Raza Ullah,Bing Yu,Youqing Shen,Hailin Cong
In this work, an environmentally friendly reduced graphene oxidized supported cobalt ferrite (CFO/rGO) catalyst was constructed using a hydrothermal technique to heterogeneously activate peroxymonosulfate (PMS) and utilized for the degradation of sulfamethoxazole (SMX) antibiotic in aqueous solution. The results exhibited that the complete degradation of SMX was achieved in 25 min under optimal conditions ([SMX] = 8.0 mg/L, [CFO/rGO-30%] = 0.5 g/L, [PMS] = 5.0 mM, pH = 7.0) in the presence of CFO/rGO-30%/PMS with a rate constant of 0.3076 min ˗1 , which was roughly 6.08 times higher compared to the CoFe 2 O 4 /PMS system (0.0506 min ˗1 ). The enhanced degradation of SMX in the CFO/rGO-30%/PMS system might be attributed to the large surface area of the CFO/rGO-30% (98.11 m 2 /g) catalyst compared to the pristine CoFe 2 O 4 (24.31 m 2 /g), which increased the availability of active sites for PMS activation . Furthermore, the influence of pivotal reaction parameters and interfering anions on SMX mineralization was also scrutinized. The formation of free radicals (SO 4 •− , • OH, and 1 O 2 ) was established through quenching experiments and electron paramagnetic resonance analysis. The degradation mechanism of SMX was speculated based on the identification of degradation intermediates and X-ray photoelectron spectroscopy spectral analysis. Mechanistic investigations suggested that the transition of Co 2+ /Co 3+ and Fe 3+ /Fe 2+ pairs on the catalyst surface was responsible for the PMS activation, and the SMX degradation was accomplished through radical and non-radical pathways. Furthermore, CFO/rGO-30% exhibited high stability after four consecutive cycles and maintained catalytic activity . Finally, the developed CFO/rGO-30% catalyst exhibited promising potential for the purification of SMX polluted water.
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PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Wentao Wu,Liangyong Chu,Santiago J. Garcia,Sybrand van der Zwaag,Ming Li,Liming Shen,Ningzhong Bao
In this paper, graphene oxide (GO) modified microcapsules have been developed for use in self-healing Cardanol-based epoxy anti-corrosion coatings on steel substrates. The microcapsules had a polymethyl methacrylate (PMMA) shell, covered with aminated GO flakes and contained either of the two complementary healing agents mixed with nanosized GO flakes. One set of capsules contained epoxidized nanosized GO and Cardanol-based epoxy resin , while the other contained aminated nanosized GO and Cardanol-based amine curing agent. The microcapsules had a narrow size distribution with a peak value of 4 μm. The Cardanol-based coatings containing various fractions of up to 20 wt% microcapsules in their stoichiometric ratio showed excellent anti-corrosion and self-healing properties. FT-IR, XPS , AFM, and Raman spectroscopy were used to characterize the size and chemical composition of the GO. Optical microscopy and SEM were used for morphological characterization. Double cantilever test upon bulk samples showed an excellent load transfer across the fracture plane after only 1 day curing at room temperature. The anti-corrosion properties of the Cardanol-based coating containing the two-component microcapsules were tested using electrochemical impedance spectroscopy (EIS). It was found that, after 60-day immersion in 3.5 wt% NaCl solution, the low-frequency impedance modulus |Z| 0.01Hz of the Cardanol-based coating containing GO-modified microcapsules was three orders of magnitude higher than that of the systems with capsules without GO. After scratching the coating containing 20 wt% GO-modified microcapsules and exposing it to an aqueous 3.5 wt% NaCl solution, the |Z| 0.01Hz of the Cardanol-based coating returned over a period of 7 days to the original value.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Yunpeng Xing,Zhiming Yang,Liang Zhao,Yaqing Zhang,Zefeng Wei,Congcong Xing,Teng Fei,Sen Liu,Tong Zhang
Development of room-temperature gas sensors with excellent sensing performances for detection of dimethyl methylphosphonate (DMMP, a simulant of organophosphate) has aroused considerable attention. However, the weak adsorption ability of sensing materials toward DMMP molecules causes poor sensing performances. In this work, a multisite strategy for enhancing sensitivity was proposed by introduction of both N-doped carbon nanoparticles (N-CNPs) and copper ions onto the surface of rGO (designated as GNC). Impressively, optimal GNC-3 exhibits the response value of 10.2% toward 100 ppm DMMP, which is 5.3 times higher than that of pristine rGO. This mechanism for multisite-assisted enhanced DMMP sensing performances was investigated by combined characterizations of Fourier-transform infrared spectra, UV-Vis spectra, photoluminescence spectra and Mott-Schottky curves. Besides the construction of multisite, improvement of hydrogen bonding interactions between DMMP molecules and N-CNPs in hybrids assisted by copper ions, and decrease of conduction band potential by formation of ternary hybrids also contribute to enhance the sensitivity of DMMP sensors. These findings not only provided new insights into designing high-performance room-temperature gas sensors, but also promoted the fundamental research on sensing mechanism for room-temperature gas sensors.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Bo Zhang,Zhen Li,Liwei Wang
Phase change materials (PCMs) show great promise for thermal energy storage and management owing to their high storage capability and stable working temperature. Developing form-stable phase change composites (PCCs) is an effective approach to addressing the liquid leakage problem. However, conventional fabrication methods of incorporating PCMs into three-dimensional crosslinking networks generally involve freeze-drying and vacuum impregnation, which leads to high energy consumption and complicated procedure. Here, we design a novel strategy to rapidly synthesize form-stable PCCs supported by a cellulose nanofiber (CNF)-based skeleton, which combines a series of reactions and methods including click chemistry, coordination reactions, and solvent exchange. The synthesis mechanisms are revealed by adequate characterizations. Based on the facile fabrication strategy, excellent comprehensive performance such as desirable phase change enthalpy, high enthalpy efficiency, superb mechanical and thermal stability, outstanding cycle stability, and mitigated supercooling is realized. Besides, we discover that introducing expanded graphite into the CNF-based matrix could extend the applicability of the strategy from hydrophilic PCMs to hydrophobic PCMs due to repulsion mitigation between the matrix and PCMs, and considerably enhance the thermal conductivity of the PCCs simultaneously. This work achieves a breakthrough in rapidly and effectively fabricating high-performance form-stable PCCs.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Xia Qiu,Danyan Xu,Ling Ma,Yong Wang
Electrochemical supercapacitors (ECs) with high energy density and power capability have demonstrated promising potential in various energy applications. In this study, 3D MnO 2 /rGO aerogels with excellent electrical conductivity was successfully prepared with a simple hydrothermal method. The as-prepared 3D aerogels could be applied for constructing the electrode of supercapacitor directly without the demand of other additives. Asymmetric supercapacitors were then constructed with Na 2 SO 4 aqueous solution as electrolyte, MnO 2 /rGO aerogel and rGO aerogel as positive and negative electrode, respectively. The asymmetric supercapacitor demonstrated maximum energy density of 18.2 Wh/kg with power density of 400 W/kg and excellent cycle stability as well.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Yuting Wang,Xiangfei Chen,Dejuan Huang,Tianxiang Jin
Three-dimensional graphene (3DG) is presented as an excellent electrocatalyst for the simultaneous detection of hydroquinone (HQ) and catechol (CC) by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Morphology and structure of 3DG were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Compared with the bare glassy carbon electrode (GCE), the 3DG-modified GCE exhibits better electrocatalytic activity in the redox reaction of HQ and CC. The 3DG-modified GCE detects both isomers selectively and sensitively by DPV and CV, latter showing a peak-to-peak separation of 190 mV. The detection limits for HQ and CC can reach 0.35 and 0.6 μM (S/N = 3), respectively, with wide linear ranges of 1-1000 μM in the presence of 50 μM of the respective other isomer. This work provides a strategy for the development of high-performance electrochemical sensors.
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