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339 results on '"Wang, Tieyu"'

24. Silicon photocathode functionalized with osmium complex catalyst for selective catalytic conversion of CO2 to methane.

Author

Li, Xing-Yi, Zhu, Ze-Lin, Dagnaw, Fentahun Wondu, Yu, Jie-Rong, Wu, Zhi-Xing, Chen, Yi-Jing, Zhou, Mu-Han, Wang, Tieyu, Tong, Qing-Xiao, and Jian, Jing-Xin

Subjects
PHOTOELECTROCHEMISTRY, OSMIUM, METHANE, PHOTOELECTROCHEMICAL cells, DENSITY functional theory, PHOTOCATHODES, METHANE as fuel, CARBON emissions, SOLAR energy
Abstract

Solar-driven CO2 reduction to yield high-value chemicals presents an appealing avenue for combating climate change, yet achieving selective production of specific products remains a significant challenge. We showcase two osmium complexes, przpOs, and trzpOs, as CO2 reduction catalysts for selective CO2-to-methane conversion. Kinetically, the przpOs and trzpOs exhibit high CO2 reduction catalytic rate constants of 0.544 and 6.41 s−1, respectively. Under AM1.5 G irradiation, the optimal Si/TiO2/trzpOs have CH4 as the main product and >90% Faradaic efficiency, reaching −14.11 mA cm−2 photocurrent density at 0.0 VRHE. Density functional theory calculations reveal that the N atoms on the bipyrazole and triazole ligands effectively stabilize the CO2-adduct intermediates, which tend to be further hydrogenated to produce CH4, leading to their ultrahigh CO2-to-CH4 selectivity. These results are comparable to cutting-edge Si-based photocathodes for CO2 reduction, revealing a vast research potential in employing molecular catalysts for the photoelectrochemical conversion of CO2 to methane. Solar-driven CO2 conversion to produce solar fuels is an attractive way to harness solar energy and reduce carbon emissions. Here, the authors report two osmium complexes as highly active and selective CO2 reduction catalysts for selective CO2-to-methane conversion on Si-based photocathodes. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Microplastics in Marine Sediments in Eastern Guangdong in the South China Sea: Factors Influencing the Seasonal and Spatial Variations.

Author

Chen, Xiaohan, Zhao, Puhui, Wang, Difeng, Wang, Lin, Zhao, Hancheng, Wang, Xinjie, Zeng, Ziyu, Li, Ping, Wang, Tieyu, Liu, Wenhua, and Bi, Ran

Subjects
PLASTIC marine debris, MARINE sediments, MICROPLASTICS, MARINE pollution, SPATIAL variation, PACKAGING materials, POLYETHYLENE terephthalate, PLASTICS
Abstract

Little is known about the comprehensive factors influencing temporal changes in microplastic abundance in marine ecosystems. We investigated seasonal variations in the microplastic distribution in marine sediments in multiple-used zones of Eastern Guangdong in the South China Sea. The top 10 cm sediments from 26 sites were collected by grab sampling in the spring, summer, and winter of 2021. Marine sediments had the lowest microplastic abundance in summer, significantly lower than in other seasons. The size of microplastics varied from 22.5 to 4363.3 µm but the 50–200 µm range was the most abundant. Transparent and fragmented microplastics were the most frequently observed composition. Microplastic abundance negatively correlated to distance to the coast. However, seaweed ecosystems impacted microplastic abundance by changing the microenvironment and/or direct contact and entrapment. Microplastic abundance is closely related to coastal mariculture and local residential and industrial activities. Polypropylene, polypropylene-polyethylene copolymer, polyethylene terephthalate, and polyethylene were the most frequently detected compositions, probably from packaging materials, textiles, and electronic/electrical/building industries. This work helps to understand the role of multiple-used zones and their influence on microplastic distributions in marine ecosystems. Appropriate management of the use and disposal of plastic waste on land was recommended to alleviate microplastic pollution in the marine environment. [ABSTRACT FROM AUTHOR]

Published
2023
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35. Solar‐Driven Water Splitting in Photovoltaic Electrolysis Systems Using Copper Terpyridine Complexes as Oxygen Evolution Catalysts.

Author

Zhou, Mu-Han, Lin, Jia-Ying, Zhang, Wei-Ping, Jian, Jing-Xin, Wondu Dagnaw, Fentahun, Wang, Tieyu, and Tong, Qing-Xiao

Subjects
OXIDATION of water, COPPER catalysts, WATER electrolysis, COPPER compounds, PHOTOVOLTAIC power systems, COPPER enzymes, CATALYSTS
Abstract

Copper complexes, as kinds of molecular catalysts bioinspired from the copper O2‐activating enzymes, are attractive targets for water oxidation, which can undergo facile and reversible OO bond formation and cleavage under mild conditions. Herein, three copper(II) complexes of Cu(tpy), Cu(ctpy), and Cu(pctpy) are investigated as oxygen evolution catalysts, which are designed and synthesized using α,α′,α″‐terpyridyl(tpy) derivatives as ligands. In the electrochemical measurements, the carboxylic‐functionalized catalysts of Cu(ctpy) and Cu(pctpy) exhibit high water oxidation turnover frequencies of 1027 and 3363 s−1, respectively. The astonishing rates of O2 production exceed the oxygen evolution complex in natural photosystem II. Moreover, the photovoltaic electrolysis (PVE) system is constructed by connecting Si solar panels with the copper complex‐decorated electrodes. Under the irradiation of AM1.5G‐simulated sunlight, a high photocurrent density of 5.47 mA cm−2 and solar‐to‐hydrogen efficiency of 6.81% are achieved for solar water splitting without external bias. This is the first report PVE system using copper complex as a oxygen evolution catalyst molecular catalyst, which is of great significance to simulate the catalytic water oxidation process of natural enzymes and build an artificial photosynthesis system to achieve green, efficient, and stable decomposition of aquatic oxygen. [ABSTRACT FROM AUTHOR]

Published
2023
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