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Binary and nanostructured Ni[sbnd]Mn perovskite fluorides as efficient electrocatalysts for urea oxidation reaction

Journal of Colloid and Interface Science 2024年第PartB期653卷 1094-1102页

作者： Wu, Tzu−Ho Liu, Yong−Shan Hong, Chung−Ting Hou, Bo–Wei Department of Chemical and Materials Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

Urea electrolysis holds tremendous promise to provide green and sustainable energy and environmental solutions, because it can simultaneously remedy urea–containing wastewater and provide energy–saving hydrogen. However, the development of this emerging technology remains challenging mainly due to a dearth of high–performance electrocatalysts for efficient urea oxidation reaction (UOR). Perovskite fluorides have the advantages of intrinsic 3D diffusion pathways, robust architecture, and tunable chemical composition, thus receiving increasing attention in many applications. In this work, the UOR performances of a series of ABF3 samples (A = K;B = Ni/Mn, Ni/Co, Co/Mn) with various compositions are investigated in a systematic fashion for the first time. Among the binary samples, KNMF41 (Ni/Mn atomic ratio = 4:1) is the optimal sample with reduced overpotential (reaching 100 mA cm−2 at 1.43 V), low Tafel slope (40 mV dec−1), enhanced reaction rate constant (6.3 × 105 cm3 mol−1 s−1), and high turnover frequency (TOF, 0.19 s−1 at 1.60 V) toward urea oxidation. By comparing with Ni[sbnd]Co and Co[sbnd]Mn samples, the binary Ni[sbnd]Mn design is confirmed to endow the perovskite fluoride with higher electrocatalytic activity, thanks to the directed adsorption of urea molecules on the adjacent Ni[sbnd]Mn active sites. This work presents a targeted synthetic strategy for obtaining efficient electrocatalysts. © 2023 Elsevier Inc.

关键词： Urea

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Autonomous DC Power Supply for Low-Power Consumers 9

Autonomous DC Power Supply for Low-Power Consumers

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9th Junior Conference on Lighting, Lighting 2024

作者： Antchev, Hristo Borisov, Dimitar Andonov, Anton Section of Electrical Engineering and Electronics University of Chemical Technology and Metallurgy Sofia Bulgaria University of Chemical Technology and Metallurgy Sofia Bulgaria

ISBN: (纸本)9798350352757

A complete schematic diagram and results of an experimental study of an autonomous DC power supply for low-power consumers are presented. The main elements for its implementation are a photovoltaic panel, charge controller with Maximum Power Point Tracking, an ultracapacitor and a charge pump. A characteristic feature is a minimum amount of elements using to convert solar energy to DC voltage for the consumer, providing flexibility in choosing its value depending on the consumer's needs. Oscillograms from the experimental studies and results for the available stored energy and charging times at two values of the ultracapacitor - 10F and 100F - are shown. © 2024 IEEE.

关键词： Supercapacitor

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Interface engineering of heterostructured vanadium oxides for enhanced energy storage in Zinc−Ion batteries

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Journal of Colloid and Interface Science 2024年第PartA期654卷 308-316页

作者： Wu, Tzu-Ho Chen, Jheng-An Su, Jia-He Department of Chemical and Materials Engineering National Yunlin University of Science and Technology Yunlin123 University Road Section 3 Douliou64002 Taiwan

Rechargeable aqueous Zn−ion batteries (RAZIBs) with the merits of cost effectiveness and high safety have been rejuvenated as tantalizing energy storage systems to meet the demand for grid−scale applications. Currently, the energy storage capability of the positive electrode (cathode) holds the key for the overall performance of RAZIBs. In this work, we reveal VO2, V10O24·12H2O (HVO), and VO2/HVO can be prepared via hydrothermal reaction by using different reducing agents. VO2 exhibits high capacity of 237 mAh/g at 4 A/g, while it suffers from quick capacity decay with 48 % retention after 2000 charge/discharge cycles. On the contrary, HVO demonstrates moderate capacity but meritorious cycle stability (i.e., 173 mAh/g at 4 A/g and 82 % after 2000 cycles). By integrating the merits of high−capacity VO2 and high−stability HVO, the biphasic VO2/HVO sample exhibits promising electrochemical performance with high capacity (317 and 239 mAh/g at 1 and 4 A/g, respectively) and good cycle stability (80 % after 2000 cycles). As examined by band structure analysis, the superior electrochemical performance of VO2/HVO is attributed to the presence of a heterojunction between VO2 and HVO enabling a built−in electric field to boost electron transport kinetics, leading to high attainable capacity and reliable cycle performance in RAZIBs. © 2023 Elsevier Inc.

关键词： Vanadium dioxide

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MnCuFe/P-GCE electrochemical sensor: a breakthrough catalyst for highly sensitive detection of methyl parathion in diverse matrices

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Environmental Science: Nano 2024年第9期11卷 3979-3991页

作者： Tharuman, Sharmila Nataraj, Nandini Chen, Shen-Ming Department of Chemical Engineering and Biotechnology National Taipei University of Technology No.1 Section 3 Chung-Hsiao East Road Taipei106 Taiwan

This study addresses the environmental and health concerns associated with the pesticide methyl parathion (MP) by exploring electrochemical sensing using a novel MnCuFe/P-GCE sensor. Derived from MnCuFe-PBA phosphidation, the MnCuFe/P sensor exhibited exceptional electrochemical performance for MP detection. Electrochemical impedance spectroscopy (EIS) indicated improved electrical conductivity post-phosphidation, enhancing charge transfer kinetics. Cyclic voltammetry (CV) demonstrated optimized redox behavior with [Fe(CN)6]3−/4−, making the sensor highly suitable for MP detection. The calibration plot against peak current revealed remarkable sensitivity over a wide range of concentration, with a detection limit (LOD) of 10 nM. The sensor's selectivity was confirmed by differentiating MP from interferents based on redox potentials and adsorption capacities. Reproducibility and repeatability assessments showed low relative standard deviation (RSD) values, indicating reliability. Long-term stability tests over four weeks demonstrated the sensor's consistent performance. Real sample analysis of various matrices validated practicality, yielding recoveries within an acceptable range for river water, tap water, fruits, and vegetables. Overall, the MnCuFe/P-GCE sensor emerges as an effective and dependable tool for electrochemically detecting MP in complex samples, showcasing sensitivity and selectivity. © 2024 The Royal Society of Chemistry.

关键词： Cyclic voltammetry

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PVT Properties of Binary Systems of Poly(ethylene glycol mono-4-octylphenyl ether) with Anisole or Benzyl Alcohol at Pressures up to 50 MPa

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Journal of chemical and engineering Data 2023年第7期68卷 1584-1598页

作者： Chung, Ya-Fong Ku, Tsui-Ju Tiwikrama, Ardila Hayu Lee, Ming-Jer Department of Chemical Engineering National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei10607 Taiwan Chemical Engineering and Biotechnology Department National Taipei University of Technology 1 Zhong-Xiao E. Road Section 3 Taipei10608 Taiwan

Densities were determined experimentally for the binary mixtures of poly(ethylene glycol mono-4-octylphenyl ether) (PEGOPE) + anisole or benzyl alcohol at 298.15-348.15 K and pressures from 0.1 to 50 MPa. All of the excess volumes are negative over the whole experimental conditions, indicating that the hydrogen-bonding effect is dominant in these two binary systems. Those isothermal and isobaric excess volumes correlate well with the Redlich-Kister equation. The specific volumes of the pure components and their mixtures were correlated with the Schotte and Flory-Orwoll-Vrij (FOV) equations of state to average absolute relative deviations (AARDs) no greater than 0.03%. © 2023 American chemical Society.

关键词： Ethers

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Tetrahedrally Structured CaMoO4 Nanospheres on Heteroatom-Doped Carbon Nanotubes for Sensitive Food Additive Electrochemical Sensors

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ACS Applied Nano Materials 2024年第3期7卷 3415-3427页

作者： Alagarsamy, Saranvignesh Vincent John, Antony Jasmine Chen, Shen-Ming Mariappan, Kiruthika Sakthinathan, Subramanian Department of Chemical Engineering and Biotechnology National Taipei University of Technology No.1 Section 3 Chung-Hsiao East Road Taipei106 Taiwan Department of Material and Mineral Resources Engineering National Taipei University of Technology No. 1 Section 3 Chung−Hsiao East Road Taipei106 Taiwan

The flavoring agent natural vanilla contains an abundant amount of the 4-hydroxy-3-methoxybenzaldehyde (Vanillin) biophenol compound. It is imperative to construct affordable and cost-effective approaches for determining the quantitative composition of Vanillin. In this work, we demonstrate a selective and sensitive electrochemical sensor for the detection of Vanillin by CaMoO4/P-CNT/GCE. We characterized our prepared nanomaterial using field emission scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical performance and analytical capabilities of this electrochemical sensor were evaluated using cyclic voltammetry, differential pulse voltammetry, and amperometry techniques. As a result of the nanocomposite, high conductivity, and high active surface area, the proposed electrochemical sensor has excellent sensitivity (DPV: 1.9718 and amperometry: 1.0947 μA μM-1 cm-2), low detection limit (DPV: 0.0017 and it amperometry: 0.00084 μM), high selectivity, and well reproducibility toward detection of Vanillin. In addition, real-sample analysis confirmed the high performance of the sensor developed in the present study. © 2024 The Authors. Published by American chemical Society.

关键词： Electrochemical sensors

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Back-Up LED Lighting System with a Bidirectional SEPIC-ZETA Converter Based-A Computer Study 8

Back-Up LED Lighting System with a Bidirectional SEPIC-ZETA ...

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8th Junior Conference on Lighting, Lighting 2023

作者： Antchev, Hristo Andonov, Anton Borisov, Dimitar University of Chemical Technology and Metallurgy Section of Electrical Engineering and Electronics Sofia Bulgaria University of Chemical Technology and Metallurgy Environmental Engineering Sofia Bulgaria

ISBN: (纸本)9798350328295

In the present work, a back-up power supply system for LED lighting, including a DC voltage source, a bidirectional SEPIC-ZETA converter, an ultracapacitor and a control system is considered. The study was carried out by means of a computer simulation, showing operating time diagrams in the different modes. The operation of the control system and the functions of the regulators included in it are described. © 2023 IEEE.

关键词： Supercapacitor

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Rational design of dysprosium cobalt oxide decorated on flower-like molybdenum disulfide: Development of an electrochemical sensor for antipsychotic drug promazine

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Process Safety and Environmental Protection 2023年 170卷 1188-1199页

作者： Koventhan, Chelliah Pandiyan, Rajaram Chen, Shen-Ming Department of Chemical Engineering and Biotechnology College of Engineering National Taipei University of Technology No. 1 Chung-Hsiao East Road Section 3 Taipei10608 Taiwan

The construction of perovskite oxides and metal chalcogenide nanocomposites has been employed to develop electrochemical sensors with outstanding sensitivity and low detection limit. In this work, we have successfully synthesized dysprosium cobalt oxide (DCO) encapsulated with molybdenum disulfide (MS) via ultrasonication way, which is employed for the electrochemical determination of antipsychotic drug promazine (PMZ). The as-prepared DCO/MS nanocomposite was scrutinized by different techniques such as X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) analysis, field emission scanning electron microscope (FE-SEM), and high-resolution transmission electron microscope (HR-TEM). Further, the prepared nanocomposites were modified on a glassy carbon electrode (GCE) surface and electrochemical activity was inspected through cyclic voltammetry (CV) and differential pulse voltammetry (DPV) in 0.1 M phosphate buffer solution (PB) with a potential window of 0.0–0.9 V. As a result, DCO/MS promotes superior electrochemical performance because of high electrochemical active surface area (0.396 cm2), good conductivity, and synergetic effect. The developed electrochemical sensor exhibits a broad linear range (0.002 – 695.6 μM) and the lowest detection limit of 0.005 µM, excellent sensitivity, repeatability, and reproducibility. Finally, the fabricated sensor was successively used for the real-time detection of PMZ in environmental and biological samples with feasible recoveries. © 2023 The Institution of chemical Engineers

关键词： Cobalt compounds

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Vapor-Liquid Equilibrium Phase Behavior of Binary Systems of Carbon Dioxide with Eugenol or Guaiacol

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Journal of chemical and engineering Data 2023年第12期68卷 3298-3305页

作者： Tiwikrama, Ardila Hayu Khudaida, Salal Hasan Long, Ching-Yu Chemical Engineering and Biotechnology Department National Taipei University of Technology 1 Zhong-Xiao E. Road Section 3 Taipei10608 Taiwan

The vapor-liquid equilibrium (VLE) phase boundary data for the binary systems consisting of carbon dioxide + eugenol and carbon dioxide + guaiacol were determined experimentally in the temperature range from 313.15 to 373.15 K and at pressures up to 24 MPa. The phase transition over the entire composition range was observed by using a variable-volume and visual phase equilibrium analyzer. From the VLE phase boundary data, K-values and critical points for VLE have been estimated. The present study involved the correlation of the recently obtained VLE data with two equations of state, namely, the Soave-Redlich-Kwong and the Peng-Robinson equations. These equations were modified to incorporate the two-parameter van der Waals one-fluid mixing rule. Overall, the average absolute pressure deviations are lower than 3%. © 2023 American chemical Society.

关键词： Phase equilibria

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Improving Photoelectrochemical Activity of a Silver Sulfide-Based Photoelectrode by Bismuth Doping for Hydrogen Evolution from Industrial Waste Water

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ACS Applied Energy Materials 2024年第11期7卷 4761-4767页

作者： Chen, Ying-Chu Kuo, Hsuan-Ting Lu, Yun-Hsiang Hsu, Yu-Kuei Department of Chemical Engineering & Biotechnology National Taipei University of Technology No. 1 Section 3 Zhong-Xiao E. Road Taipei City10608 Taiwan Department of Optoelectronic Engineering National Dong Hwa University No. 1 Section 2 Da Hsueh Road Shoufeng Hualien97401 Taiwan

Trivalent bismuth (Bi3+) is put forward for the first time as a multifunctional dopant to tailor the optoelectronic property of silver sulfide (Ag2S), which is known as a promising photoelectrode candidate in view of its narrow band gap of ∼1.1 eV comparable to that of its toxic PbS counterpart. The introduction of Bi3+ into Ag2S gives rise to Bi:Ag2S to harvest light with a photon energy even lower than 1.1 eV via providing additional energy levels within its band gap. The electrical conductivity of Bi:Ag2S is also improved via offering extra free electrons to increase the carrier concentration to facilitate the transport of photoexcited electron-hole pairs. As an additional result of such increment in electron density is the Fermi level of Bi:Ag2S closer to its conduction band edge, leading to its potential difference with respect to that of the sulfide (S2-) and sulfite (SO32-) redox couples present in large quantity in industrial wastewater markedly amplified. More importantly, the degree of surface band bending is thereby well-strengthened to promote the separation of the photogenerated electron-hole pairs, which is further reinforced by depositing Bi:Ag2S on the zinc oxide nanorods (ZnO NRs) to form a Bi:Ag2S/ZnO NR heterojunction. The synergistic effect of the aforesaid enhancements renders the hydrogen evolution rate over Bi:Ag2S/ZnO NRs largely accelerated, as evidently manifested in its photocurrent density achieving 7 mA cm-2, far exceeding those reported for additional Ag2S-based photoelectrodes in the literature, of which the great promise is in view of such outperformance well-corroborated. © 2024 American chemical Society.

关键词： Sulfur compounds

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