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331 results on '"Yeh, Min-Hsin"'

17. In‐Situ Growth of 2D to 3D NiO on Nickel Foam with Enhanced Capacity Retention as Battery‐Type Electrode for Asymmetric Supercapacitor.

Author

Wihdatul Himmah, Siti, Wulan Septiani, Ni Luh, Wustoni, Shofarul, Raissa, Prima Hardianto, Yuda, Kim, Hyungjun, Rinawati, Mia, Yeh, Min‐Hsin, Yuliarto, Brian, and Nuruddin, Ahmad

Subjects
SUPERCAPACITOR electrodes, ENERGY density, POWER density, NICKEL oxide, NICKEL, SUPERCAPACITORS
Abstract

This work presents a systematic study to synthesize NiO on nickel foam (NF) using a straightforward and cost‐efficient hydrothermal method, followed by calcination. Through comprehensive physicochemical analyses, it was demonstrated that the properties of the NF@NiO could be modulated by adjusting the concentration of the nickel (II) nitrate hexahydrate precursor. Notably, a morphological transition from a 2D sheet‐like structure to a 3D rambutan‐like formation was observed as the precursor concentration increased. The best‐performing NF@NiO 4 mM showed a maximum areal capacity of 723 mC cm−2 (equivalent to 547.73 F g−1) at a current density of 0.5 mA cm−2. This electrode also maintained remarkable cycle stability, retaining 78.9% of its capacitance after 10,000 cycles at a current density of 50 mA cm−2 in 2 M KOH. Furthermore, the assembled asymmetric supercapacitor (ASC) (NiO 4 mM//AC) achieved a specific capacitance of 64.79 F g−1 at a current density of 1 A g−1 with an energy density of 17.63 Wh kg−1 at a power density of 700 W kg−1. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Evoking dynamic Fe–Nx active sites through the immobilization of molecular Fe catalysts on N-doped graphene quantum dots for the efficient electroreduction of nitrate to ammonia.

Author

Rinawati, Mia, Chiu, Yen-Shuo, Chang, Ling-Yu, Chang, Chia-Yu, Su, Wei-Nien, Septiani, Ni Luh Wulan, Yuliarto, Brian, Huang, Wei-Hsiang, Chen, Jeng-Lung, and Yeh, Min-Hsin

Abstract

The excessive energy demand of the conventional Haber–Bosch process for ammonia (NH3) generation, coupled with the disruptive effects of nitrate (NO3−) pollution on the global nitrogen cycle, has made the electrocatalytic nitrate reduction reaction (NO3−RR) an essential exit strategy for sustainable NH3 synthesis. However, the intricate multi-step proton and electron transfer process posed a great challenge in achieving high-efficiency electrocatalysts. In this study, we report a selective and highly active NO3−RR electrocatalyst featuring molecular M–Nx sites derived from the immobilization of Fe ions within N-doped graphene quantum dots (NGQDs). We demonstrated that the formation of molecular Fe–Nx coordination activated the NO3−RR of NGQDs-Fe, despite the initial inactivity of NGQDs. In situ Raman analysis revealed that those Fe–Nx sites served as favourable adsorption sites for *NO3. Such catalyst achieved an FE of 93% and a yield rate of 15.41 mmol h−1 cm−2 for NH3 at −0.8 V (vs. RHE) in an alkaline medium. These findings revealed the preferential sequential 2e− and 6e− transfer pathways over the direct 8e− pathway in the NO3−RR, which provides new mechanistic insights into the nitrate reduction reaction. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Favoring the Selective H2O2 Generation of a Self-Antibiofouling Dissolved Oxygen Sensor for Real-Time Online Monitoring via Surface-Engineered N-Doped Reduced Graphene Oxide

Author

Lin, Yu-Chi, primary, Rinawati, Mia, additional, Huang, Wei-Hsiang, additional, Aulia, Sofiannisa, additional, Chang, Ling-Yu, additional, Guo, Yi-Ting, additional, Chen, Kuan-Jung, additional, Chiang, Wei-Hung, additional, Haw, Shu-Chih, additional, and Yeh, Min-Hsin, additional

Published
2023
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47. A near-infrared photoelectrochromic device with indoor thermal management for self-powered smart windows.

Author

Chang, Ching-Cheng, Chang, Ling-Yu, Cheng, Yao-Sheng, Chang, Yu-Hsin, Lai, Tsung-Hsin, Septiani, Ni Luh Wulan, Yuliarto, Brian, and Yeh, Min-Hsin

Abstract

A photoelectrochromic device (PECD) is a combination of a dye-sensitized solar cell (DSSC) and an electrochromic device (ECD) that directly generates transmittance contrast from solar radiation without an additional power source. In terms of application, PECDs have recently been utilized as self-powered smart windows for eco-friendly green buildings. The majority of PECDs have exceptional optical performance in the visible light region, with their electrochromic property regulating the indoor luminance. Nonetheless, indoor temperature regulation is also a potential opportunity that might be examined further for PECDs. As the temperature is highly correlated with the incident flux of infrared light, this study presents a near-infrared photoelectrochromic device (NIR-PECD) with WO3 as the electrochromic material for blocking infrared radiation, realizing indoor thermal management without external power. The NIR-PECD exhibited the ability of thermal modulation and lowered the indoor temperature with a transmittance contrast in the NIR region, demonstrating a transmittance contrast (ΔT) of 40.2% and an outstanding photocoloration efficiency (PhCE) of 55.85 cm2 min−1 W−1 at the wavelength of 1000 nm. In addition, the NIR-PECD also displayed a 5.6 °C temperature difference between the colored and bleached states, indicating the thermal management capabilities of keeping the interior cool in the colored state by blocking the NIR. As a further application, NIR-PECDs can be used as self-powered smart windows in green buildings to achieve internal temperature control without external power. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Multifunctional Structure-Modified Quaternary Compounds Co9Se8–CuSe2–WSe2Mixed with MWCNT as a Counter Electrode Material for Dye-Sensitized Solar Cells

Author

Liu, Rih-Jia, Chang, Ling-Yu, Lin, Fang-Sian, Lee, Yu-Hsin, Yeh, Min-Hsin, and Ho, Kuo-Chuan

Abstract

In this study, a trimetallic selenide material with a hollow spherical structure (Co9Se8–CuSe2–WSe2) was synthesized through two consecutive solvothermal reactions. The synergistic effect between the quaternary elements, the benefits of the selenization of metals, and the unique morphology led to the prominent electrocatalytic ability of Co9Se8–CuSe2–WSe2hollow spheres. Co9Se8–CuSe2–WSe2hollow spheres were then mixed with oxygen plasma-treated multiwalled carbon nanotubes (MWCNT) as counter electrode (CE) material for dye-sensitized solar cells (DSSCs), achieving a photoelectric conversion efficiency (η) of 9.23% under one sun condition (AM 1.5G, 100 mW cm–2), surpassing the 8.08% of devices with platinum counter electrodes (PtCEs). For indoor conditions, a T5 light source was applied to the DSSCs with Co9Se8–CuSe2–WSe2+ MWCNT CE, and the efficiency increased to 14.14% under 3600 lx irradiance. Finally, Co9Se8–CuSe2–WSe2+ MWCNT CE demonstrated good stability with 92.23% retention after 1000 cycles of cyclic voltammetry, exceeding the 82.49% of PtCE. Therefore, Co9Se8–CuSe2–WSe2+ MWCNT shows potential as a substitute for platinum as CE material for DSSCs.

Published
2024
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