International Journal of Electrochemical Science
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2023
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IF 1.5
Lanlan Shen,Zhiru Bai,Yu Jiang,Liying Li,Fengxing Jiang,Jingkun Xu,Huanhuan Qiu,Huixuan Liu,Rongri Tan
Based on quaterthiophenen, bisethyleneoxyl are appended to thiophene rings (2,5-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)thieno[3,2-b]thiophene, BED-TT) for modified monomer structure and obtain a lower onset potential as well as strong electron donor properties. Different molar ratio copolymers of BED-TT with 3,4-ethylenedioxythiophene (EDOT) was electrochemically synthesized, and the effects of changes in the amount of EDOT on the electrochemical and spectrochemistry properties of the copolymers were tracked. The resultant copolymer P(BED-TT- co -EDOT) was characterized via cyclic voltammetry, Raman, and spectroelecrochemistry. The study found that the amount of EDOT in the mixed system of BED-TT and EDOT can regulate the oxidation potential, electrochemical activity, and redox process of polymer films to a certain extent. The spectroelectrochemical results revealed that the copolymer P(BED-TT- co -EDOT) has a narrower optical band gap (1.63-1.67eV) and a richer electrochromic color (from pink purple, purple to gray blue, blue).
研究领域:
材料科学
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电化学
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分析化学
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DOI
高影响因子
Chemical Science
·
2021
·Vol. 12
·期 27
·9494-9499
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IF 9.825
Jilin Liu,Kai Yu,Hong Zhang,Jing He,Jie Jiang,Hai Luo
Towards the goal of on-line monitoring of transient neutral intermediates during electrochemical reactions, an electrochemistry-neutral reionization-mass spectrometry (EC-NR-MS) technique was developed in this work. The EC-NR setup consisted of a customized EC flow cell, a sonic spray ionization source, a heating tube, an ion deflector and an electrospray ionization source, which were respectively used for the precise control of the electrochemical reaction, solution nebulization, droplet desolvation, ion deflection and neutral intermediate ionization. Based on the EC-NR-MS approach, some long-sought neutral radicals including TPrA˙, DBAE˙ and TEOA˙, which belong to important reductive intermediates in electrochemiluminescence (ECL) reactions, were successfully identified which helps to clarify the previously unproven ECL reaction mechanism. These findings were also supported by spin-trapping experiments and the tandem MS technique. Accordingly, the EC-NR-MS method provides a direct solution for studying complicated electrochemical reactions, especially for detecting short-lived neutral radicals as well as ionic intermediates.
研究领域:
分析化学
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电化学
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质谱分析
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2016
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IF 7.145
Bingyan Zhang,Xiaofan Zhang,Xin Xiao,Yan Shen
Fast charge transfer kinetics at the photoelectrode/electrolyte interface is critical for efficient photoelectrochemical (PEC) water splitting system. Thus, far, a measurement of kinetics constants for such processes is limited. In this study, scanning electrochemical microscopy (SECM) is employed to investigate the charge transfer kinetics at the photoelectrode/electrolyte interface in the feedback mode in order to simulate the oxygen evolution process in PEC system. The popular photocatalysts BiVO4 and Mo doped BiVO4 (labeled as Mo:BiVO4) are selected as photoanodes and the common redox couple [Fe(CN)6]3–/[Fe(CN)6]4– as molecular probe. SECM characterization can directly reveal the surface catalytic reaction kinetics constant of 9.30 × 107 mol–1 cm3 s–1 for the BiVO4. Furthermore, we find that after excitation, the ratio of rate constant for photogenerated hole to electron via Mo:BiVO4 reacting with mediator at the electrode/electrolyte interface is about 30 times larger than that of BiVO4. This suggests that introduction of Mo6+ ion into BiVO4 can possibly facilitate solar to oxygen evolution (hole involved process) and suppress the interfacial back reaction (electron involved process) at photoanode/electrolyte interface. Therefore, the SECM measurement allows us to make a comprehensive analysis of interfacial charge transfer kinetics in PEC system.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
Polymers
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2017
·Vol. 9
·期 5
·173
·
IF 3.364
Shuai Li,Guoliang Liu,Xiuping Ju,Yan Zhang,Jinsheng Zhao
In this study, four novel donor–acceptor systems, 4-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-N-(4-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)phenyl)-N-(4-nitrophenyl)aniline (NETPA), 4-(4-methoxythiophen-2-yl)-N-(4-(4-methoxythiophen-2-yl)phenyl)-N-(4-nitrophenyl)aniline (NMOTPA), 4-(4-methylthiophen-2-yl)-N-(4-(4-methylthiophen-2-yl)phenyl)-N-(4-nitrophenyl)aniline (NMTPA) and 4-nitro-N,N-bis(4-(thiophen-2-yl)phenyl)aniline (NTTPA), were successfully synthesized by Stille coupling reaction and electropolymerized to obtain highly stable conducting polymers, PNETPA, PNMOTPA, PNMTPA and PNTTPA, respectively. The polymers were characterized using cyclic voltammetry (CV), step profiling and UV–Vis–NIR spectroscopy. The band gaps (Egvalues) were 1.34, 1.59, 2.26, and 2.34 eV, for PNETPA, PNMOTPA, PNMTPA and PNTTPA, respectively. In addition, electrochromic switching showed that all polymers exhibit outstanding optical contrasts, high coloration efficiencies and fast switching speeds in the near-infrared region (NIR). These properties make the polymers suitable materials for electrochromic applications in NIR region.Keywords:nitrotriphenylamine;electrochemistry;thiophene derivatives;electrochromism;spectroelectrochemistry
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
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2024
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IF 4.7
Yufei Deng,Xiaofan He,Rong Jin,Dechen Jiang,Danjun Fang
In this communication, local electrochemiluminescence (ECL) imaging is achieved using scanning electrochemical cell microscopy (SECCM) to create a localized region for the occurrence of ECL reaction. The system is demonstrated using a droplet at the micropipette that is contact with the prepared Ru-Silica@Au particles at indium tin oxide (ITO) slide. Tri- n -propylamine (TPrA) in the droplet reacts with ruthenium complex in a 10 μm-diameter-region to produce ECL emission, which is recorded by photo multiplier tube (PMT) underneath the ITO slide. By contacting each local region consecutively, the distribution of steady-state current and the related ECL emission at the ITO surface is imaged. The local ECL intensity show an approximately linear dependence with the current, but obvious deviation from the linear curve is observed at some regions. This result suggests that the ECL emission is not only determined by the transferred electron number in the electrochemical reaction, and also affected by local environments at ITO surface. As compared with the traditionally used ECL imaging in the bulk solution, this strategy avoids the cross-talking of ECL emission from nearby regions, and could offer a new way to unveil more molecular mechanism in the ECL reaction.
研究领域:
分析化学
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电化学
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成像技术
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Qikang Huang,Peize Li,Mingkui Wang,Yan Shen
This study reports on determining kinetics of electrochemical reduction CO 2 to CO on Au catalysts using the substrate generation/tip collection (SG/TC) mode of scanning electrochemical microscopy (SECM). We introduced a simple but effective method based on transient technique to obtain a series of apparent heterogeneous rate constants k based on Fick’s second law by controlling the tip-substrate distance and the voltage of the substrate electrode within the SECM framework. By analysis the transient current recorded during the chronoamperometric characterization, we can successfully determine the apparent rate constant k for the simplified total conversion process of CO 2 + 2H + + 2e - → CO + H 2 O onto Au catalyst electrode serving as an example, which increases from 5.02 × 10 –2 cm⋅s −1 to 7.16 × 10 –2 cm⋅s −1 in the low potential range of −2.2 to −2.6 V (vs. Pt/PPy) and decreases to 6.54 × 10 -2 cm⋅s −1 at –2.8 V (vs. Pt/PPy). The method proposed here can be applied to quantitatively analyze the kinetic of CO 2 electrochemical reduction reaction, and thus provide a useful tool to guide the synthesis of catalyst as well as in-situ performance evaluation.
研究领域:
电化学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Hao Yang,Muhammad Bilal Hanif,Shan-Lin Zhang,Chang-Jiu Li,Cheng-Xin Li
Sr(Ti 0·3 Fe 0.7 )O 3-δ (STF) materials with satisfactory stability and no rare-metal elements have attracted increasing research interest as oxygen electrodes of solid oxide electrochemical cells . However, STF-based electrodes are still limited by their modest catalytic activities at low temperatures. This can be improved by A-site deficiency of STF-based materials; however, data related to the influence of A-site deficiency of perovskite-oxide-based materials on sintering behavior and electrochemical performance are still lacking. Herein, porous electrodes with different Sr x (Ti 0·3 Fe 0.7 )O 3-δ compositions (x = 0.85–1) were prepared. The effects of A-site cation deficiency ratios and sintering temperatures on the microstructures and electrochemical performance of the as-obtained STF electrodes were investigated. Electrochemical performance was improved for A-site deficient Sr x (Ti 0·3 Fe 0.7 )O 3-δ . For Sr 0·9 (Ti 0·3 Fe 0.7 ) 3-δ electrode material sintered at 1050 °C, the lowest polarization resistance measured at 700 °C was ~0.14 Ω⸳cm 2 but increased at higher x values. At sintering temperatures above 1050 °C, the sintering diffusion occurred, where the electrolyte diffused through the deficient electrodes to form a dense layer at the electrode/electrolyte interface. On the other hand, although the presence of such diffused dense layer did not have significant effect on the electrochemical performance of the cells, it could be prevented by using lower sintering temperatures (≤1000 °C) to avoid possible negative effects on comprehensive performance. For the electrode obtained at x = 0.9 and sintered at 1000 °C, the overall polarization resistance was recorded as 0.099 Ω⸳cm 2 at 700 °C. In sum, these findings look promising for future research.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Xia Qiu,Ling Wang,Yinggui Zhu
A novel electrochemiluminescence (ECL) system consisting of Eosin B (EB) and K 2 S 2 O 8 was studied and found to generate ECL following the oxidation or reduction of Eosin B and K 2 S 2 O 8 . The type of buffer solution, type of co-reactant, pH value, and K 2 S 2 O 8 concentration were optimized through experiments to make the reaction system reach the best value. In addition, we found that Cr 3+ has a great quenching effect on the EB reaction system. Through the comparison of ECL and CV under different conditions, DPV curve, UV spectrum and ECL spectrum experiments, we focused on the quenching mechanism of Cr 3+ on the system and made reasonable guesses. This method demonstrates the potential application value of ECL in the field of environmental monitoring and reveals the potential value of organic molecular ECL luminophores.
研究领域:
分析化学
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环境科学
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电化学
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产品关联
DOI
高影响因子
SENSORS
·
2019
·Vol. 19
·期 13
·2926
·
IF 3.031
Chenlin Lu,Zhipeng Li,Liwei Ren,Nan Su,Diannan Lu,Zheng Liu
The development of a sensitive, quick-responding, and robust glucose sensor is consistently pursued for use in numerous applications. Here, we propose a new method for preparing a Cu2O electrode for the electrochemical detection of glucose concentration. The Cu2O glucose electrode was prepared by in situ electrical oxidation in an alkaline solution, in which Cu2O nanoparticles were deposited on the electrode surface to form a thin film, followed by the growth of Cu(OH)2nanorods or nanotubes. The morphology and electrocatalytic activity of a Cu2O glucose electrode can be tuned by the current density, reaction time, and NaOH concentration. The results from XRD, SEM, and a Raman spectrum show that the electrode surface was coated with cubic Cu2O nanoparticles with diameters ranging from 50 to 150 nm. The electrode exhibited a detection limit of 0.0275 mM, a peak sensitivity of 2524.9 μA·cm−2·mM−1, and a linear response range from 0.1 to 1 mM. The presence of high concentrations of ascorbic acid, uric acid, dopamine and lactose appeared to have no effects on the detection of glucose, indicating a high specificity and robustness of this electrode.Keywords:glucose detection;glucose sensor;electrochemical analysis;Cu2O nanoparticles;electrochemical deposition
研究领域:
电化学
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生物传感器
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材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2024
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IF 15.8
Jin Zhao,Zehua Chen,Zhihui Chen,Zeyi Meng,Jianwei Zhang,Wenjie Lv,Congshan Guo,Zhizhen Lv,Shouce Huang,Yang Yang,Zhongfan Liu,Jingshu Hui
An accurate assessment of the electrodeposition mechanism is essential for evaluating the electrochemical stability and reversibility of the metal anodes. Multiple strategies aimed at uniform Zn deposition have been extensively reported, yet it is challenging to clarify the Zn crystal growth regularity and activity due to the obscured physicochemical properties of as-deposited Zn. Herein, we present a protocol for elucidating the controlled epitaxial growth process of Zn crystals and quantifying their surface electrochemical activity using scanning electrochemical microscopy. We find that the early-stage epitaxy tends to form a stacked-multilayer structure accompanied by intermittent rotation. The site-dependent kinetics and morphology correlation reveal a distinct evolution path at early and final stages. Our exploration advances the understanding of the Zn growth mechanism and facilitates the realization of the interface kinetics of metal batteries in situ.
研究领域:
材料科学
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电化学
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表面科学
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产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2021
·Vol. 34
·期 6
·1048-1053
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IF 3.223
Rong Li,Xiaoxia Li,Liu Su,Hetong Qi,Xuanfeng Yue,Honglan Qi
A label-free electrochemical aptasensor was fabricated for the determination of serotonin (5-HT) by the employment of specific binding between 5-HT and aptamer and directly electrochemical measurement of 5-HT oxidation. The comparison between two aptasensors and two strategies was studied. An electrochemical aptasensor fabricated using 57-mer aptamer was facilely used to determine 5-HT in the range from 1 μM to 100 μM with detection limit of 0.3 μM via one step recognition and detection. This work demonstrates that electrochemical method combing aptamer recognition and 5-HT oxidation provides an alternative and promising method for the determination of 5-HT with good selectivity and simplicity.
研究领域:
分析化学
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生物传感器
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Yaping Zhang,Yuyu Bu,Fengqiu Jiang,Huan Li,Xi Chen,Jin-Ping Ao
In this work, a typical BiVO 4 photoanode is employed to explore the performance improving mechanism by surface electrochemical reduction. Corresponding results demonstrate some new information that nanoparticle-like amorphous layer is formed on the surface of BiVO 4 and its thickness is positive correlation with the SER force. Furthermore, Scanning Kelvin probe results indicate that the Fermi level of the amorphous layer is shifted positively, inducing a homojunction built-in electric field between the amorphous layer and the bulk BiVO 4 . The transfer ability of photogenerated holes from the bulk to the surface of photoanode can enhance obviously. In addition, due to the quasi-oxygen vacancy defects in the amorphous layer, the enhanced hydrophilicity improves the PEC performance synergistically. However, as the thickness of amorphous layer increasing, it raises the migration time and secondary recombination rate of the photogenerated carriers. Therefore, a controllable amorphous surface and PEC performance of BiVO 4 photoanode can realize by adjusting the SER force.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
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