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Your search keyword '"Liew, Kim Meow"' showing total 120 results
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28. A nonmetallic plasmonic catalyst for photothermal CO2 flow conversion with high activity, selectivity and durability.

Author

Wan, Xueying, Li, Yifan, Chen, Yihong, Ma, Jun, Liu, Ying-Ao, Zhao, En-Dian, Gu, Yadi, Zhao, Yilin, Cui, Yi, Li, Rongtan, Liu, Dong, Long, Ran, Liew, Kim Meow, and Xiong, Yujie

Subjects
SURFACE plasmon resonance, PLASMONICS, CATALYSTS, RESONANCE effect
Abstract

The meticulous design of active sites and light absorbers holds the key to the development of high-performance photothermal catalysts for CO2 hydrogenation. Here, we report a nonmetallic plasmonic catalyst of Mo2N/MoO2-x nanosheets by integrating a localized surface plasmon resonance effect with two distinct types of active sites for CO2 hydrogenation. Leveraging the synergism of dual active sites, H2 and CO2 molecules can be simultaneously adsorbed and activated on N atom and O vacancy, respectively. Meanwhile, the plasmonic effect of this noble-metal-free catalyst signifies its promising ability to convert photon energy into localized heat. Consequently, Mo2N/MoO2-x nanosheets exhibit remarkable photothermal catalytic performance in reverse water-gas shift reaction. Under continuous full-spectrum light irradiation (3 W·cm−2) for a duration of 168 h, the nanosheets achieve a CO yield rate of 355 mmol·gcat−1·h−1 in a flow reactor with a selectivity exceeding 99%. This work offers valuable insights into the precise design of noble-metal-free active sites and the development of plasmonic catalysts for reducing carbon footprints. In this work, the authors design a Mo2N/MoO2-x nonmetallic plasmonic catalyst by regulating synergy between two specific active sites. Highly efficient, selective, and durable CO2 hydrogenation under relatively mild reaction conditions is achieved [ABSTRACT FROM AUTHOR]

Published
2024
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44. On The Flame Behavior during Cable Insulation Material Ignited by Fault Arc: A Flame Extracting and Noise Reduction Algorithm.

Author

Wang, Yalong, Li, Chaoying, Liu, Haidong, Lin, Jin, Lu, Shouxiang, and Liew, Kim Meow

Subjects
INSULATING materials, NOISE control, FLAME, ELECTRIC faults, IGNITION temperature, ELECTRIC arc, EMERGENCY management, MOLECULAR recognition
Abstract

The electric fault arc, particularly the series arc, leads to plenty of electrical fire. The limitations of t previous studies include: (1) most existing research focused on gaseous atmospheres rather than solids materials, which is contrary to the actual demand; and (2) the studied external heat sources were restricted to cone heaters and flames, while the electric arc was seldom studied. To overcome these limitations, we developed an experimental platform to investigate the flame behavior when cable insulation material was ignited by the fault arc. We proposed a flame-extracting and noise-reduction algorithm to process the enormous number of photos shot by the high-speed camera. The main obtained findings were: (1) the appropriate size of the structuring element plays an essential role in filtering the flame region in the photos, too small a size resulted in the wrong recognition of incandescent particles, while too large a size made a jagged distortion; (2) the mean flame area increased as the system load grew; (3) The flame size became more prominent, and the flame appeared more frequently in specific locations when the system load increased. The in-depth understanding of flame behavior provided by this work will help to optimize the design of electric systems and disaster prevention reduction. [ABSTRACT FROM AUTHOR]

Published
2023
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49. A 3D flexible and robust HAPs/PVA separator prepared by a freezing-drying method for safe lithium metal batteries.

Author

Wang, Wei, Liao, Can, Liew, Kim Meow, Chen, Zonghai, Song, Lei, Kan, Yongchun, and Hu, Yuan

Abstract

Lithium (Li) metal batteries have shown great promise for next-generation electrical energy storage due to the unique features of lithium metal like light weight, high specific capacity, and the lowest anode potential. Nevertheless, the uncontrollable growth of dendritic and mossy Li, resulting in a low coulombic efficiency and serious safety concerns, has hindered the practical application of rechargeable Li-metal batteries. Here we report an environmentally friendly nanocomposite separator, comprising polyvinyl alcohol and hydroxyapatite, which exhibits an outstanding Young's modulus and high mechanical flexibility. We show that this separator can efficiently suppress the growth of dendritic Li and enable a homogeneous stable solid electrolyte interphase. Compared to lithium metal batteries using a commercial polyolefin-based separator, cells using the reported nanocomposite separator demonstrate a superior electrochemical performance with a much higher coulombic efficiency during the charge/discharge cycling at a practical current density of 2 mA cm−2. This work indicates that nanocomposite engineering could be a promising strategy to develop stable, safe and sustainable Li-metal batteries. [ABSTRACT FROM AUTHOR]

Published
2019
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