ELECTROCHEMISTRY COMMUNICATIONS
·
2012
·
IF 4.859
Xiangheng Niu,Chen Chen,Hongli Zhao,Jie Tang,Yuxiu Li,Minbo Lan
A new screen-printed carbon electrode with porous architectures prepared using an extremely facile and low-cost approach is introduced. The preparation mainly involved a printing procedure of a graphite-based layer doped with CaCO 3 powders and a subsequent dissolution of these powders. The resulting porous screen-printed carbon electrode (P-SPCE) can offer large surface, broad potential window, low background current and high electrochemical reactivity. Moreover, the proposed P-SPCE provides enhanced performance for enzyme-free H 2 O 2 sensing compared to conventional glassy carbon electrodes and screen-printed carbon electrodes. These attractive properties of the P-SPCE are expected to be of wider applications.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2019
·Vol. 32
·期 3
·620-625
·
IF 2.691
Xiangyu Ma,Kun Qian,Martha Kandawa-Schulz,Weimin Miao,Yihong Wang
Copper ion (Cu 2+ ) is one of the heavy metal ions which has been considered as a severe pollutant affecting the environment and human health. Therefore, it is necessary to detect Cu 2+ sensitively and conveniently in food and drinks. However, the gold standard method that inductively coupled plasma mass spectrometry (ICP-MS) is expensive equipment required and time-consuming. In this work, a highly sensitive and facile electrochemical method was studied to directly determine the concentration of Cu 2+ without cumbersome modification on the surface of glassy carbon electrode (GCE). In the presence of ferric ion (Fe 3+ ), Cu 2+ could play a role of catalyst in the detection system, and the electrochemical signal of differential pulse voltammetry (DPV) response to Cu 2+ could be amplified obviously. Under the optimal conditions, a good linear relationship was obtained in the range of 1 nM to 5 μM with a detection limit of 57.5 pM (S/N=3) were obtained. Besides, the proposed method has good applicability for the detection of Cu 2+ in tap water. Furthermore, the copper complex was detected and the results were indicated the proposed method was effective and sensitive.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 1
·628-632
·
IF 1.556
Hu Xin,Miao Yuqing,Zhou Shilin,Liang Xiaocai
Here we report a Bi/mesoporous carbon modified glass carbon electrode (Bi-MC-GCE) for the detection of heavy metal ions Zn, Cd and Pb. Bi(NO3)3 was firstly entrapped into the holes of MCs by sonicating them together in solution. Then the dispersed mixture was pipetted
onto the surface of GCE and left to dry. Bi(NO3)3 in the holes of MCs was reduced to metallic Bi during the process of deposition for square wave stripping analysis. The obtained Bi-MC-GCE exhibits significantly enhanced sensitivity for Zn, Cd and Pb detection compared
to blank GCE, bismuth or MC alone modified GCE, which is attributed to the high specific surface area of MCs and the increased amount of entrapped bismuth as active sites for the deposition and stripping of heavy metal ions. A linearship is observed for the concentration of Zn, Cd, and Pb
from 10 to 110 ppb. The relative standard deviation was 3.7% for Zn, 3% for Cd and 8% for Pb at the 90 ppb level (n = 3). The suggested Bi-MC-GCE exhibits a potential application for real water sample analysis.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 161
·期 1
·B9
·
IF 2.588
Weimeng Si,Zhen Han,Wu Lei,Qiuju Wu,Yuehua Zhang,Mingzhu Xia,Qingli Hao
A fast and sensitive method for the determination of Imidacloprid (IMI) based on a simply pretreated glassy carbon electrode (GCE) has been developed. The easy activation at 2.0 V for only 30s of GCE leads to obvious catalytic property to IMI. The electrocatalytic properties and the electron-transfer kinetics of the activated GCE were investigated by cyclic voltammetry, differential pulse voltammetry and electrochemical impedance spectroscopy. The reduction mechanism of IMI was put forward and the limit of detection (LoD) was estimated to be about 0.61 μM.
研究领域:
分析化学
·
电化学
✓ 已验证
DOI
高影响因子
ANALYTICAL SCIENCES
·
2012
·Vol. 28
·期 5
·497-502
·
IF 1.255
Li Yamin,Wu Shufang,Luo Peili,Liu Jie,Song Ge,Zhang Kai,Ye Baoxian
An ultrasensitive voltammetric sensor, a simply coated graphene-Nafion suspension on a glass carbon electrode surface, was fabricated and used to investigate the electrochemical behavior of theophylline as described in the present paper. The results indicated that this voltammetric sensor exhibited a special recognition capacity to determine theophylline as well as having high sensitivity due to the excellent characteristics of graphene and the adsorption action of Nafion for theophylline. Under the selected condition using differential pulse voltammetry, the response peak currents had a linear relationship with the theophylline concentrations in two ranges from 1.0 × 10 –8 – 1.0 × 10 –6 and 2.0 × 10 –6 – 3.0 × 10 –5 mol L –1 with a low detection limit of 6.0 × 10 –9 mol L –1 . Moreover, according to the results obtained in the analysis of theophylline in two standard samples, it demonstrated the applicability of present method into real sample determination.
研究领域:
分析化学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 132
·期 20
·
IF 2.877
Rong Qing,Guo De’en,Ma Jiao,Lin Siyuan,Huang Han,Kong Deming,Gao Yongli,Zhou Conghua
Crystallization of perovskite is monitored in carbon-electrode based, low-temperature, mesoscopic perovskite solar cells. Crystallographic and morphological properties of the perovskite are examined through changes in the film thickness of carbon-electrode or the volume of perovskite precursor. It is observed that, when a relatively thin carbon-electrode or large volume of perovskite precursor is used, perovskite crystallites mainly form on the device surface, leaving the bottom part of the device un-wetted. However, if a thicker carbon-electrode or less perovskite precursor is used, crystallization could be seen in the whole porous skeleton, and relative uniform distribution of perovskite crystallites is achieved. As such, uneven crystallization is observed. Such behavior is due to solvent evaporation on the surface, which facilitates nucleation processes on the surface, while retards crystallization on the bottom due to the Ostwald ripening effect. Charge transfer/recombination processes and photo-to-electric power conversion properties are studied. As expected, uneven crystallization results in retarded charge transfer and increased risk of recombination, and poor power conversion efficiency, for example, ∼3%. In contrast, uniform crystallization accelerates charge transfer and reduces recombination risk, and increases the efficiency to higher than 11% (AM1.5G, 100 mW/cm 2 ).
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
ANALYST
·
2021
·Vol. 146
·期 13
·4384-4390
·
IF 4.616
Haofan Wang,Yin Guo,Hongcheng Pan
The sensitive determination of selenium and copper is of importance for environmental monitoring and food safety. A stripping voltammetric determination of selenium and copper in water and selenium-rich foods was developed using hierarchical dendritic gold nanostructure (AuHD) modified glassy carbon electrodes (GCE). The AuHD thin films were electrodeposited potentiostatically onto the GCE from a solution containing 25 mM HAuCl4 and 0.1 M Na2SO4 at −0.6 V for 20 min. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) studies showed that the electrodeposited gold thin film shows a nanoforest-like morphology with a thickness of about 30–40 μm and a hierarchical dendritic structure with primary-, secondary-, and higher-order branches. Se(IV) and Cu(II) in a 0.1 M H2SO4 solution were determined by square-wave anodic stripping voltammetry using the AuHDs/GCE as the working electrode. Prior to anodic stripping, Se(IV) and Cu(II) were accumulated onto the working electrode surface at −0.2 V for 300 s. The stripping peak currents of Se(IV) at 0.81 V and Cu(II) at 0.31 V were positively correlated with the concentrations of Se(IV) and Cu(II) in a range of 50–700 nM. The limits of detection (3σ) for Se(IV) and Cu(II) were 1.4 nM and 3.7 nM, respectively. The accuracy of the method was verified by analysing certified water standard reference materials, and the results showed that the method has good accuracy and high precision. The method was used to determine selenium and copper in tap water, selenium-rich rice and selenium-rich eggs. The results were compared with those obtained by using inductively coupled plasma-mass spectrometry (ICP-MS) and found to be consistent with those of ICP-MS. The proposed method had the advantages of simplicity, rapidity, good reproducibility, and high sensitivity and it can be used for the analysis of real samples.
研究领域:
环境科学
·
食品科学
·
分析化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2022
·
IF 2.731
Huimin Li,Yapan Shi,Yudong Gao
A new voltammetric sensor, simultaneous electropolymerization of L-Citrulline (L-Cit) and β-cyclodextrin (β-CD) film modified glassy carbon electrode (GCE) was built for the first time. It was used to construct this sensor for quantification of these important pesticides and sensitive determination of metribuzin. The proposed metribuzin sensor displays excellent performance with wide linear range (3.0 × 10−8 ~ 1.0 × 10−6 mol L−1), ultralow detection limit of 10 nM (S/N = 3), and favourable specificity. Also, the sensor was applied for determination of metribuzin in the real samples, the satisfying results are achieved. The results imply that the proposed sensor can be potentially used for the environmental pollution science and environmental analytical chemistry.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2024
·Vol. 14
·期 1
·87
·
IF 2.6
Yuantao Yang,Junli Wang,Xuanbing Wang,Jinlong Wei,Xiaoning Tong,Ruidong Xu,Linjing Yang
The electrolytic refining of crude tin is generally carried out in the fluorosilicic acid (H2SiF6) system with the assistance of bone glue and β-naphthol. However, the high saturated vapor pressure and low stability of H2SiF6present environmental concerns and do not align with sustainable development goals. In this paper, the electrochemical behavior of tin on a glassy carbon (GC) electrode was studied in a relatively green and environmentally friendly methanesulfonic acid (MSA) system. Bone glue, sodium lignosulfonate, and β-naphthol were used as additives to make the deposit morphology smooth and to ensure grain refinement. The electrochemical reduction process of Sn2+in an MSA system is a quasi-reversible process controlled by diffusion. The apparent activation energyEa= 14.189 kJ/mol for the ion diffusion of Sn2+was further calculated. The results of chronoamperometry showed that the electrocrystallization of Sn2+on the GC electrode gradually tended to three-dimensional instantaneous nucleation with the increase in applied potential. The morphology and phase of the deposits were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the deposits were uniform and dense pure tin. This work elucidates the electrochemical behavior of tin in a methanesulfonic acid system.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Lupeng Zhang,Wen Liu,Chenxi Liang,Yiyang Liu,Haining Wang,Shanfu Lu,Yan Xiang
Potassium-ion batteries (PIBs) have garnered considerable interest for promising stationary energy storage devices. However, the current researches of carbon anode for PIBs still face the severe challenge of low areal capacity, unsatisfactory kinetics rate and low initial coulombic efficiency from the practical application perspective. To solve these issues, we design Fluorine-doped Typha orientalis fibre (FTOF) membrane by constructing integrated architecture and regulating electronic structure, and this FTOF membrane is used as freestanding carbon anode. This novel carbon anode not only retains integrated architecture with bamboo-like microfiber, but also presents abundant F-doped site and vacancy defects. As a result, the FTOF electrode delivers high areal capacity (1.12 mAh cm −2 ) with initial coulombic efficiency (62.5 %), stable cycling performance (0.41 mAh cm −2 after 500 cycles) and excellent rate performance (0.50 mAh cm −2 at 4 mA cm −2 ), overmatching most of the reported studies. Theoretical calculations on K adsorption affinities at various configurations illuminate the synergistic effects of F-doping and vacancy defects in improving K + adsorption kinetics. Moreover, full cells deliver superior cycling performance with high capacity retention of 90.2 % after 1000 cycles. This work provides a rational electrode design strategy and theoretical guidance to achieve ultra-high areal capacity carbon anode for PIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Haisong Zheng,Chenghui Li,Aixiang Wei,Jun Liu,Yu Zhao,Zhiming Xiao
In this paper, the perovskite solar cells (PSCs) with the structure of FTO glass/compact TiO 2 /mesoporous TiO 2 /CH 3 NH 3 PbI 3 /carbon electrode were designed and fabricated. The CH 3 NH 3 PbI 3 absorption layers were prepared using one-step solvent-engineering method. The effects of volume ratios of dimethyl sulfoxide (DMSO) to N, N-dimethylformamide (DMF) and molar ratios of PbI 2 to CH 3 NH 3 I (MAI) on structure and morphology of CH 3 NH 3 PbI 3 absorption layers, as well as photovoltaic performance of PSCs were studied. The results show that the PSCs based on a specific ratio of PbI 2 :MAI = 1:1.4 and DMSO:DMF = 1:3 exhibited an optimal photovoltaic performance, yielding an open-circuit voltage (V oc ) of 0.72 V, short-circuit current density (J sc ) of 25.98 mA/cm 2 , fill factor (FF) of 0.46, and power conversion efficiency (PCE) of 8.45%. And the incident photon-to-electron conversion efficiency (IPCE) is close to 85% between 400 and 600 nm visible region.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-7
·
IF 4.58
Huang Wei,Zhang Ting,Hu Xiaoya,Wang Yang,Wang Jianmin
A porous carbon material doped with an iron species (Fe/PC) was prepared by carbonizing a mixture of zeolitic imidazolate framework-8 in the presence of iron(II) ions. The resulting material was characterized by X-ray diffraction, nitrogen adsorption isotherms, transmission electron microscopy, and by Raman and X-ray photoelectron spectroscopy. Fe/PC was the deposited on the surface of glassy carbon electrode (GCE) to obtain a sensor for amperometric determination of phenolic compounds. The unique catalytic activity, good electrical conductivity and hierarchical structure of the Fe/PC composite results in good electrooxidative activity towards hydroquinone (HQ; typically at 44 mV) and catechol (CC; typically at 160 mV). Under optimal conditions, the amperometric responses are linear in the range from 0.1 to 120 μmol · L −1 for HQ, and from 1.0 to 120 μmol · L −1 for CC. The respective detection limits are 14 and 33 nmol · L −1 . The sensor is highly selective against potential interferents and was successfully applied to the determination of HQ and CC contents in (spiked) water samples.
An amperometric sensor for phenolic compounds was constructed by using a metal-organic framework derived iron doped porous carbon material.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 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）