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22. Co(II)–Cu(II) mixed-oxide catalysts for single-step synthesis of 2,4,5-triaryl-1H-imidazole derivatives under microwave irradiation.

Author

Jopale, Manohar K., Zheng, Zhiyong, Choi, Soowon, Shelke, Bharat N., Mharsale, Nilesh, Patil, Shripad, Chine, Sonali S., Gade, Vilas, Kahane, Shital V., Bulakhe, Ravindra N., Kim, Ji Man, and Kategaonkar, Amol H.

Subjects
ANALYTICAL chemistry, CATALYST synthesis, COPPER, OXIDATION states, X-ray diffraction
Abstract

In this study, a catalyst composite of Co–Cu was prepared from chloride-containing precursor of Co(II) and Cu(II) metals using the milky latex of the Euphorbia neriifolia plant following green principles of synthesis. The catalyst composite was characterized using XRD, EDAX, SEM, HR-TEM, FTIR, XPS and TOF-MS. The crystallinity of the mixed-oxide composite with a distorted octahedral nature was confirmed from analysis. Chemical charge analysis of the Co–Cu mixed phase based on XPS revealed Co2+ and Cu2+ oxidation states. This material was used for synthesizing 2,4,5-triaryl-1H-imidazole (TIMDZOL) derivatives. Analysis of reaction conditions revealed that EtOH : PEG at 8 : 2 ratio under microwave conditions showed better yields with less time and better reusability of the Co–Cu catalyst. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Discovery of abnormal lithium-storage sites in molybdenum dioxide electrodes.

Author

Shon, Jeong Kuk, Lee, Hyo Sug, Park, Gwi Ok, Yoon, Jeongbae, Park, Eunjun, Park, Gyeong Su, Kong, Soo Sung, Jin, Mingshi, Choi, Jae-Man, Chang, Hyuk, Doo, Seokgwang, Kim, Ji Man, Yoon, Won-Sub, Pak, Chanho, Kim, Hansu, and Stucky, Galen D

Abstract

Developing electrode materials with high-energy densities is important for the development of lithium-ion batteries. Here, we demonstrate a mesoporous molybdenum dioxide material with abnormal lithium-storage sites, which exhibits a discharge capacity of 1,814 mAh g(-1) for the first cycle, more than twice its theoretical value, and maintains its initial capacity after 50 cycles. Contrary to previous reports, we find that a mechanism for the high and reversible lithium-storage capacity of the mesoporous molybdenum dioxide electrode is not based on a conversion reaction. Insight into the electrochemical results, obtained by in situ X-ray absorption, scanning transmission electron microscopy analysis combined with electron energy loss spectroscopy and computational modelling indicates that the nanoscale pore engineering of this transition metal oxide enables an unexpected electrochemical mass storage reaction mechanism, and may provide a strategy for the design of cation storage materials for battery systems.

Published
2016

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