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7. Ultrasonic-Assisted Electrodeposition of Mn-Doped NiCo 2 O 4 for Enhanced Photodegradation of Methyl Red, Hydrogen Production, and Supercapacitor Applications.

Author

Lee, Kuan-Ching, Tiong, Timm Joyce, Pan, Guan-Ting, Yang, Thomas Chung-Kuang, Uma, Kasimayan, Tseng, Zong-Liang, Nikoloski, Aleksandar N., and Huang, Chao-Ming

Subjects
PHOTODEGRADATION, ULTRAVIOLET spectrophotometry, HYDROGEN production, FOAM, PLATING baths, ELECTROPLATING, THIN films, X-ray diffraction
Abstract

This paper presents a novel ultrasonic-assisted electrodeposition process of Mn-doped NiCo2O4 onto a commercial nickel foam in a neutral electroplating bath (pH = 7.0) under an ultrasonic power of 1.2 V and 100 W. Different sample properties were studied based on their crystallinity through X-ray diffraction (XRD), morphology was studied through scanning electron microscopy (SEM), and photodegradation was studied through ultraviolet–visible (UV–Vis) spectrophotometry. Based on the XRD results, the dominant crystallite phase obtained was shown to be a pure single NiCo2O4 phase. The optical properties of the photocatalytic film showed a range of energy band gaps between 1.72 and 1.73 eV from the absorption spectrum. The surface hydroxyl groups on the catalytic surface of the Mn-doped NiCo2O4 thin films showed significant improvements in removing methyl red via photodegradation, achieving 88% degradation in 60 min, which was approximately 1.6 times higher than that of pure NiCo2O4 thin films. The maximum hydrogen rate of the composite films under 100 mW/cm2 illumination was 38 μmol/cm2 with a +3.5 V external potential. The electrochemical performance test also showed a high capacity retention rate (96% after 5000 charge–discharge cycles), high capacity (260 Fg−1), and low intrinsic resistance (0.8 Ω). This work concludes that the Mn-doped NiCo2O4 hybrid with oxygen-poor conditions (oxygen vacancies) is a promising composite electrode candidate for methyl red removal, hydrogen evolution, and high-performance hybrid supercapacitor applications. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Efficient CsPbBr 3 Quantum-Dot Light-Emitting Diodes Using Sputtered NiO Films as Hole Injection Layers.

Author

Huang, Pao-Hsun, Chen, Sih-An, Chao, Li-Wei, Xie, Jia-Xun, Liao, Ching-Yu, Tseng, Zong-Liang, and Chen, Sheng-Hui

Subjects
QUANTUM dots, LIGHT emitting diodes, QUANTUM efficiency, MAGNETRON sputtering, PEROVSKITE, LUMINESCENCE
Abstract

Perovskite quantum dots (QDs) have showed excellent optoelectronic properties to extend the application range of novel solid-state lighting, such as perovskite QD based LEDs (QD-LEDs). However, the traditional device structure of perovskite QD-LEDs employed PEDOT:PSS as a hole inject layer (HIL), which impairs stability due to acidic surface characteristics. This study proposes the sputtered NiO films as an HIL to replace acidic PEDOT:PSS. The NiO films with significantly different characteristics were prepared by controlling the sputtering parameters to investigate the devices' performance of NiO-based CsPbBr3 QD-LEDs. The optimized device showed an excellent performance with maxima luminescence of 20,118 cd/m2 and an external quantum efficiency (EQE) up to 3.63%. [ABSTRACT FROM AUTHOR]

Published
2023
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28. The Enhanced Thermal Stability of (Mg 0.95 Ni 0.05) 2 TiO 4 Dielectric Ceramics Modified by a Multi-Phase Method.

Author

Shen, Chun-Hsu, Shen, Ting-Wei, Hsieh, Tsai-Yu, Lan, Kai-Chun, Hsu, Shen-Hsien, Wang, Ching-Hsuan, Lin, Yu-Ting, Wu, Wen-Fang, and Tseng, Zong-Liang

Subjects
THERMAL stability, TITANIUM dioxide, DIELECTRICS, RADIO frequency, DIFFRACTION patterns, CERAMICS
Abstract

The thermal stability of (Mg0.95Ni0.05)2TiO4 dielectric ceramics has been improved by mixing with CaTiO3 phases owing to higher positive temperature coefficients. The pure (Mg0.95Ni0.05)2TiO4 and the mixture phase systems of CaTiO3-modified (Mg0.95Ni0.05)2TiO4 were verified by XRD diffraction patterns to ensure the crystallite of different phases. The microstructures of the CaTiO3-modified (Mg0.95Ni0.05)2TiO4 were observed by SEM and EDS to investigate the relation between element ratios and grains. As a result, it can be seen that the thermal stability of the CaTiO3-modified (Mg0.95Ni0.05)2TiO4 can be effectively enhanced, compared with the pure (Mg0.95Ni0.05)2TiO4. Moreover, the radio frequency dielectric performances of CaTiO3-modified (Mg0.95Ni0.05)2TiO4 dielectric ceramics are strongly dependent upon the density and the morphology of the specimens. The champion sample with the ratio of (Mg0.95Ni0.05)2TiO4 and CaTiO3 of 0.92:0.08 showed an εr value of 19.2, an Qf value of 108,200 GHz, and a τf value of −4.8 ppm/°C, which may encourage (Mg0.95Ni0.05)2TiO4 ceramics to broaden the range of novel applications and match the requirements of 5G or next-generation communication systems. [ABSTRACT FROM AUTHOR]

Published
2023
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