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434 results on '"Wu, Ming-Chung"'

19. Double‐Hollow Au@CdS Yolk@Shell Nanostructures as Superior Plasmonic Photocatalysts for Solar Hydrogen Production.

Author

Chen, Yi‐An, Nakayasu, Yuhi, Lin, Yu‐Chang, Kao, Jui‐Cheng, Hsiao, Kai‐Chi, Le, Quang‐Tuyen, Chang, Kao‐Der, Wu, Ming‐Chung, Chou, Jyh‐Pin, Pao, Chun‐Wei, Chang, Tso‐Fu Mark, Sone, Masato, Chen, Chun‐Yi, Lo, Yu‐Chieh, Lin, Yan‐Gu, Yamakata, Akira, and Hsu, Yung‐Jung

Subjects
HYDROGEN production, HOT carriers, STRUCTURAL engineering, VISIBLE spectra, STRUCTURAL engineers
Abstract

Structural engineering has proven effective in tailoring the photocatalytic properties of semiconductor nanostructures. In this work, a sophisticated double‐hollow yolk@shell nanostructure composed of a plasmonic, mobile, hollow Au nanosphere (HGN) yolk and a permeable, hollow CdS shell is proposed to achieve remarkable solar hydrogen production. The shell thickness of HGN@CdS is finely adjusted from 7.7, 18.4 to 24.5 nm to investigate its influence on the photocatalytic performance. Compared with pure HGN, pure CdS, a physical mixture of HGN and CdS, and a counterpart single‐hollow cit‐Au@CdS yolk@shell nanostructure, HGN@CdS exhibits superior hydrogen production under visible light illumination (λ = 400–700 nm). The apparent quantum yield of hydrogen production reaches 8.2% at 320 nm, 6.2% at 420 nm, and 4.4% at 660 nm. The plasmon‐enhanced activity at 660 nm is exceptional, surpassing the plasmon‐induced photoactivities of the state‐of‐the‐art plasmonic photocatalysts ever reported. The superiority of HGN@CdS originates from the creation of charge separation state at HGN/CdS heterojunction, the considerably long‐lived hot electrons of plasmonic HGN, the magnified electric field, and the advantageous features of double‐hollow yolk@shell nanostructures. The findings can provide a guideline for the rational design of versatile double‐hollow yolk@shell nanostructures for widespread photocatalytic applications. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Concentrated Formic Acid from CO2 Electrolysis for Directly Driving Fuel Cell

Author

Zhang, Chao, primary, Hao, Xiaobin, additional, Wang, Jiatang, additional, Ding, Xiayu, additional, Zhong, Yuan, additional, Jiang, Yawen, additional, Wu, Ming-Chung, additional, Long, Ran, additional, Gong, Wanbing, additional, Liang, Changhao, additional, Cai, Weiwei, additional, Low, Jingxiang, additional, and Xiong, Yujie, additional

Published
2024
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41. Gas‐Solid Phase Reaction Derived Silver Bismuth Iodide Rudorffite: Structural Insight and Exploring Photocatalytic Potential of CO2 Reduction.

Author

Chang, Jia‐Mao, Lin, Ting‐Han, Hsiao, Kai‐Chi, Chiang, Kuo‐Ping, Chang, Yin‐Hsuan, and Wu, Ming‐Chung

Subjects
EXTENDED X-ray absorption fine structure, SILVER iodide, SOLAR cells, CLEAN energy, REDUCTION potential, X-ray absorption near edge structure, SURFACE potential
Abstract

Photocatalytic reduction of CO2 is a promising strategy to mitigate the effects of global warming by converting CO2 into valuable energy‐dense products. Silver bismuth iodide (SBI) is an attractive material owing to its tunable bandgap and favorable band‐edge positions for efficient CO2 photoreduction. In this study, SBI materials, including AgBi2I7, AgBiI4, Ag2BiI5, and Ag3BiI6 are first synthesized, through gas‐solid reaction by controlling the stoichiometric ratio of reactants. The X‐ray absorption near edge structure (XANES) and extended X‐ray absorption fine structure (EXAFS) results revealed that the distance between Ag‐I is proportional to the degree of Ag ions delocalization, which occupies the vacant sites. That greatly retards the charge recombination at vacant sites. In addition, the surface potential via photo‐assisted Kelvin probe force measurements of various SBI catalysts shows that Ag3BiI6 exhibits the highest surface potential change due to the rich delocalized Ag ions. This results in effective charge carrier transport and prevention of charge recombination at vacant sites. Taking the above advantages, the averaged CO and CH4 production rates for Ag3BiI6 achieved 0.23 and 0.10 µmol g−1 h−1, respectively. The findings suggest that Ag3BiI6 has a high potential as a novel photocatalyst for CO2 reduction and sheds light on the possibility of solving environmental contamination and sustainable energy crises. [ABSTRACT FROM AUTHOR]

Published
2024
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42. Recent Advances in Metal Oxide Electron Transport Layers for Enhancing the Performance of Perovskite Solar Cells.

Author

Liao, Ying-Han, Chang, Yin-Hsuan, Lin, Ting-Han, Lee, Kun-Mu, and Wu, Ming-Chung

Subjects
SOLAR cells, ENERGY levels (Quantum mechanics), ELECTRON mobility, PEROVSKITE, STANNIC oxide, ELECTRON transport
Abstract

Perovskite solar cells (PSCs) have attracted considerable interest owing to their low processing costs and high efficiency. A crucial component of these devices is the electron transport layer (ETL), which plays a key role in extracting and transmitting light-induced electrons, modifying interfaces, and adjusting surface energy levels. This minimizes charge recombination in PSCs, a critical factor in their performance. Among the various ETL materials, titanium dioxide (TiO2) and tin dioxide (SnO2) stand out due to their excellent electron mobility, suitable band alignment, high transparency, and stability. TiO2 is widely used because of its appropriate conduction band position, easy fabrication, and favorable charge extraction properties. SnO2, on the other hand, offers higher electron mobility, better stability under UV illumination, and lower processing temperatures, making it a promising alternative. This paper summarizes the latest advancements in the research of electron transport materials, including material selection and a discussion of electron collection. Additionally, it examines doping techniques that enhance electron mobility and surface modification technologies that improve interface quality and reduce recombination. The impact of these parameters on the performance and passivation behavior of PSCs is also examined. Technological advancements in the ETL, especially those involving TiO2 and SnO2, are currently a prominent research direction for achieving high-efficiency PSCs. This review covers the current state and future directions in ETL research for PSCs, highlighting the crucial role of TiO2 and SnO2 in enhancing device performance. [ABSTRACT FROM AUTHOR]

Published
2024
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