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Journal of Electroanalytical Chemistry
Elcevier Sequoia S.A.
Journal of Electroanalytical Chemistry

Elcevier Sequoia S.A.

1572-6657

Journal of Electroanalytical Chemistry/Journal Journal of Electroanalytical ChemistrySCIISTPCCREI
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    Modified and simplified photogalvanic cells: Solar energy harvesting using bromo cresol green dye with different electrodes and cell dimensions

    Koli, PooranDayma, YashodharaPareek, Ramesh KumarKumar, Rajendra...
    10页
    查看更多>>摘要：Photogalvanic cells fabricated of H-shaped glass tube having Platinum (Pt) and saturated calomel electrodes dipped in the electrolyte solution (photosensitizer-reductant-surfactant-alkali) are widely reported. The modification of the electrodes, shapes, and sizes of cells has evaded the attention of researchers in the field for further improvement in the cell performances. Therefore, the present study on the use of various alternative electrodes (combination electrode, cylindrical graphite, rectangular graphite) and alternative cell vessels (Hshaped tube, simple glass tube) has been done with aim of further increasing the electrical output of the photogalvanic cells. Various alternative electrode couples like Pt and Combination electrode, Pt and cylindrical graphite electrode, and Pt and rectangular graphite electrode couples placed in the modified cell vessels have been exploited in present work. The Bromo cresol green dye sensitizer-formaldehyde reductant photogalvanic cells using modified electrode couples dipped in the different types of the glass tube vessels (i.e., blackened Hshaped glass tube, non-blackened simple glass boiling tube) have been studied at an artificial sunlight illumination. For photogalvanic cell fabricated of the rectangular graphite electrode (0.6 cm x 2.3 cm) placed in a simple non-blackened glass boiling tube; the optimum cell performance in terms of the maximum power, shortcircuit current, open-circuit potential, efficiency, and storage capacity is of the order of 1170 mu W, 8000 mu A, 1130 mV, 9.02 %, and 70 min, respectively. It is concluded that the use of readily available cheap graphite and cheap boiling tubes provides an opportunity for simplified fabrication of the photogalvanic cells at reduced cost with the advantage of greatly enhanced electrical output for future studies.
      原文链接:
    • NSTL
    • Elsevier

    Performance improvement of a PEMFC with dead-end anode by using CFD-Taguchi approach

    Amadane, YassineMounir, Hamid
    13页
    查看更多>>摘要：In this paper, the design of experiments by the Taguchi method integrated with computational fluid dynamics simulation has been implemented for determining optimum operating conditions. A numerical model has been made with ANSYS code for proton exchange membrane fuel cell with the dead-end anode mode. This study assesses the impact of four factors, namely gas diffusion layer porosity, hydrogen mass fraction, nitrogen mass fraction, and water saturation. The influence of inlet pressure (Pin,1 = 104Pa, Pin,2 = 3.104Pa, and Pin,3 = 6.104Pa) and relative humidity (RH1 = 0%, RH2 = 50%, and RH3 = 100%) have been studied using the integrative approach. For Pin,1, Pin,2, and Pin,3, the optimum levels yielding a superior performance were (L5, L3, L2, and L1), (L5, L3, L2, and L2), and (L5, L3, L3, and L1), respectively. For RH1, RH2, and RH3, the optimum levels yielding a better performance were (L5, L1, L3, and L1), (L5, L3, L1, and L1), and (L5, L3, L2, and L1), respectively. Our findings revealed that the electrical current density reflecting the cell performance decreased with increasing the water accumulation, the nitrogen mass fraction, and decreasing the hydrogen mass fraction. The percentage error between Taguchi calculations and computational outputs of power densities was 0.23%, 0.19%, 0.45%, 0.28%, 0.2%, and 0.16%.
      原文链接:
    • NSTL
    • Elsevier

    Fundamentals on kinetics of electrochemical reduction of CO2 at a bismuth electrode

    Qin, Su-FangXie, Yuan-JiangWang, YiYou, Le-Xing...
    5页
    查看更多>>摘要：Electrochemical reduction of CO2 into renewable carbon-neutral fuels has been extensively studied. Current attentions mainly focus on the development of high-performance materials and molecular dynamics, fundamentals on kinetics of electrochemical reduction of CO2 are still unclear. Herein, we design a simplified electrochemical process, CO2-saturated K2SO4 solution at bismuth electrodes, to elucidate the electrochemical reaction kinetics of CO2 reduction reaction. A totally irreversible process for CO2 reduction reaction occurs and this reaction can be described as CO2 + H2O + 2e- -> HCOO- + OH-. It is firstly reported that the reduction of CO2 at bismuth electrodes is of a diffusion-controlled process, and the diffusion coefficient of CO2 is (1.98 +/- 0.22) x 10-5 cm2 center dot s-1. From the well-defined linear sweep voltammograms, electron transfer coefficient is obtained as 0.18 +/- 0.01. Combining with the half-wave potential (-1.503 +/- 0.002 V vs. Ag/ AgCl (sat. KCl)) from differential pulse voltametric results, the standard heterogeneous rate constant is estimated to be (3.4 +/- 0.2) x 10-3 cm center dot s-1. These new findings may identify electrochemical reaction kinetic questions and be helpful to understanding the electrochemical conversion between CO2 and carbon-neutral renewable energy.
      原文链接:
    • NSTL
    • Elsevier

    Simultaneous detection of hesperidin and narirutin in residual water using nanoporous platinum electrosynthesized by alloying-dealloying mechanism

    Beluomini, Maisa AzevedoStradiotto, Nelson RamosBoldrin Zanoni, Maria Valnice
    11页
    查看更多>>摘要：This paper reports the versatile preparation of three-dimensional nanostructured porous platinum (3DnpPt) directly on the surface of a screen-printed electrode via a simple electrochemical method and its application for the simultaneous voltammetric determination of hesperidin (HES) and narirutin (NAR) in residual water from the citrus industry. The surface morphology of the electrode was characterized by field-emission scanning electron microscopy (FEG-SEM), electron diffraction X-ray (EDX), X-ray photoelectron spectroscopy (XPS), and by the electrochemical impedance spectroscopic (EIS) technique. The results obtained from the voltammetric studies conducted showed that the sensor has good electrocatalytic activity and selectivity for HES and NAR oxidation. The linear scanning voltammetry (LSV) technique employed yielded linear ranges of 10 mu mol L-1 to 0.4 mmol L-1 and 10 mu mol L-1 to 0.5 mmol L-1, with detection limits of 6.61 mu mol L-1 and 0.21 mu mol L-1, and amperometric sensitivity of 0.52 A L mol-1 and 0.79 A L mol-1 for HES and NAR, respectively. The proposed 3DnpPt-SPE sensor also exhibited good repeatability and high selectivity, as well as long-term stability. The sensor was successfully applied in residual water sample for the simultaneous quantification of HES and NAR where good recovery rates were obtained.
      原文链接:
    • NSTL
    • Elsevier

    Asymmetric polyoxometalate-polypyrrole composite electrode material for electrochemical energy storage supercapacitors

    Vannathan, Anjana AnandanChandewar, Pranay R.Shee, DebaprasadMal, Sib Sankar...
    12页
    查看更多>>摘要：Nowadays, metal-oxides impregnated conducting polymers as electrode materials are attracted much attention due to their higher stability. Here, the metal-oxide cluster, polyoxometalate (K5H2[PV4W8O40]-center dot 11H(2)O, PV4W8), was introduced into the polypyrrole (PPy) matrix to overcome the polymers stability issues, and thus, the resulting novel PV4W8/PPy (symmetric) composite electrode has been reported. XPS confirmed the presence of all atoms on the polymer backbone with respective oxidation states. Nevertheless, doping of PV4W8 on the conducive PPy matrix's surface can affectively improve the ion's transfer. Finally, the asymmetric PV4W8-PPy/PPy composite exhibits a prodigious specific capacitance of 291 F g(-1), larger than the PPy (90.01 F g(-1)) and PV4W8 (39.03 F g(-1)) at 0.4 A g(-1) current density. The PV4W8-PPy/PPy (asymmetric) electrode showed excellent cycle stability. However, a symmetric supercapacitor device based on PV4W8/PPy composite possesses a specific capacitance of 195.27 F g(-1) and an energy density of 8.94 Wh kg(-1) at the same current density as PV4W8-PPy/PPy (asymmetric) electrode with remarkable cycle stability.
      原文链接:
    • NSTL
    • Elsevier

    PtBi on carbon cloth as efficient flexible electrode for electro-oxidation of liquid fuels

    Ning, XiaomeiZhou, XiaosongLuo, JinZhan, Liang...
    10页
    查看更多>>摘要：Pt modified by Bi had a great improvement for its catalytic performances. Herein, Bi-modified Pt was directly supported on carbon cloth (CC) as an efficient flexible electrode without using polymer binder. The catalyst structure of CC-based electrodes and their catalytic performances in glycerol and formic acid electro-oxidation reactions (GOR and FOR) were systematically studied. The research results indicated that Bi blocked certain sites of Pt, which limited the formation and adsorption of toxic products and intermediates. Bi-modified Pt on CC electrode had higher current density, better stability, and improved selectivity of dehydrogenation process in FOR and higher selectivity of glyceric acid in GOR. The electron enriched Pt resulting from Bi electron transfer and the increased bismuth hydroxide were in favor of the electro-oxidation catalytic performances. On the basis of introducing Bi, the added glucose was further beneficial to the performance due to the improved interaction between metal and CC.
      原文链接:
    • NSTL
    • Elsevier

    A tattoo-like glucose abiotic biofuel cell

    Banerjee, SaikatSlaughter, Gymama
    7页
    查看更多>>摘要：Glucose abiotic biofuel cell using gold nanoparticles (AuNPs) ink printed electrodes on bacterial nanocellulose was developed with colloidal platinum (co-Pt) anode and silver oxide/multiwalled carbon nanotube (Ag2O-MWCNTs) nanocomposite cathode. The co-Pt was electrodeposited to increase the conductivity of the printed AuNPs electrode and enhance the oxidation of glucose at the anode. The Ag2O-MWCNT composite was synthesized and modified on the cathode surface to provide a porous conductive network and increase the electrode electrocatalytic activity. The surface morphologies and electrochemical properties were characterized using scanning electron microscopy (SEM), cyclic voltammetry (CV), and linear sweep voltammetry (LSV). An open circuit voltage (V-oc) of 0.43 V, short circuit current density (I-sc) of 0.405 mA/cm(2), and maximum power density (P-max) of 0.055 mW/cm(2) at 0.23 V were achieved in the presence of 5 mM glucose, whereas a higher V-oc of 0.57 V, Isc of 0.581 mA/cm(2), and P-max of 0.087 mW/cm(2) at 0.35 V were obtained in the presence of 20 mM glucose. Using various glucose concentrations, the peak power density increased linearly and showed good performance in serum containing glucose. This single abiotic biofuel cell generated adequate power via a voltage booster circuit to illuminate an LED.
      原文链接:
    • NSTL
    • Elsevier

    Label-free biosensing of mercury(II) in milk using an aptamer-gated graphene field-effect transistor

    Wang, YuhongQu, HaoWang, RongrongDong, Baolei...
    7页
    查看更多>>摘要：Due to the environmental pollution by the growing urban, agricultural and industrial disposals, dairy products are susceptible to heavy metal pollution in the production process. As one of the most toxic heavy metals, mercury cause serious damage to the environment and even public health. Effective monitoring of Hg(II) in large number of diary samples requires the development of rapid assaying methods. In this research work, we report the preparation of a label-free biosensor for Hg(II) using an aptamer-gated graphene field-effect transistor (AptSGGT) with the gate electrode modified by a structure-switching aptamer against Hg(II) and blocked with bovine serum albumin. The aptamer immobilized on the gate electrode acts as both a receptor and a reporter for Hg(II) by specifically recognizing Hg(II) through stable T-Hg2+-T coordination complex, triggering the folding of the single-stranded aptamer into a duplex structure. The conformational change results in the redistribution of the surface charge on the gate electrode, and produces a large channel current response by the inherent field-effect amplification. This sensing mechanism can effectively enhance the selectivity of the SGGT-based biosensor to mercury ions by significantly reducing the unspecific responses of other interfering cations. The detection limit of Hg(II) by Apt-SGGT sensor was as low as 5 nM, and the linear detection range was from 5 to 200 nM. The sensor can realize the detection of mercury ion residues in milk with a high recovery rate, and has a good application prospect in the detection and analysis of heavy metal residues in complex systems.
      原文链接:
    • NSTL
    • Elsevier

    Core/shell NiMoSe@NiMoO4 micro-cuboids anchored on Nickel foam as self-supported electrode towards efficient and stable hydrogen generation

    He, TengHe, YiLi, HongjieYin, Xiangying...
    8页
    查看更多>>摘要：Developing cost-effective and earth-abundant metal catalysts to act as noble metal-based catalysts substitute for highly efficient hydrogen production remain challenges. Herein, Superaerophobic and core-shell structured NiMoSe@NiMoO4 micro-cuboids were successfully synthesized on 3D nickel foam (NF) via two-step hydrothermal method. Benefiting from the porous NF substrate, large catalytic activity area, numerous lattice defects generated in selenization process as well as superwetting and superaerophobic properties of electrode surfaces, the obtained self-supported hybrids, especially the NiMoSe@Ni0.33Mo0.67O4 electrode presented excellent hydrogen generation performance that merely requires small overpotentials of 82.1 mV and 120.3 mV at a low and high current density of 10 mA center dot cm-2 and 50 mA center dot cm-2 in alkaline electrolyte, respectively, which is also competitive with other transition metal selenides reported literatures. Besides, the low Tafel slope of 35.23 mV center dot dec-1 and long term stability for 20 h suggesting the fast hydrogen evolution reaction kinetics and outstanding durability of electrode. This work provides a cost-effective and facile synthesis of transition metal selenides for renewable energy system.
      原文链接:
    • NSTL
    • Elsevier

    Rechargeable hybrid organic Zn battery (ReHOZnB) with non-flammable electrolyte

    Naveed, AhmadChen, JiahangRaza, BareeraLiu, Yunjian...
    8页
    查看更多>>摘要：Zn-based rechargeable batteries suffer from thermodynamic instability of Zn anode in aqueous electrolytes that results in low Coulombic efficiencies (CEs) and decreased anode reversibility. Therefore, as an alternative, non-aqueous Zn-battery chemistry has gained significant attention in the recent times that can effectively resolve the issues of thermodynamic instability along with improvement in CE of Zn plating/stripping. However, the adoption of organic electrolytes over aqueous ones throws a serious safety challenge. In this work, traditional aqueous electrolytes have been replaced by an intrinsically safe organic electrolyte in dual-ion Zn bat-teries to construct a rechargeable hybrid organic Zn battery (ReHOZnB) that effectively addresses the safety concerns along with providing highly reversible Zn anode. The Zn/ Na2Mn[Fe(CN)(6)] (Na2MnHCf) battery delivered a reversible capacity of 89.3 mAh g(-1) at a C-rate of 1 (1C = 160 mA g(-1)) exhibiting long term cycling stability with a capacity retention of 77% (66%) after 1000 (2000) charge-discharge cycles. The cycling performance has been stabilized through in-situ generation of cathode electrolyte interphase (CEI). This works provides an alternate electrolyte for the development of safe Zn batteries.
      原文链接:
    • NSTL
    • Elsevier