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Ultrahigh pressure-induced modification of morphology and performance of MOF-derived Cu@C electrocatalysts

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Title: Ultrahigh pressure-induced modification of morphology and performance of MOF-derived Cu@C electrocatalysts
Authors: Yamane, Ichiro Browse this author
Sato, Kota Browse this author
Ando, Teruki Browse this author
Tadokoro, Taijiro Browse this author
Yokokura, Seiya Browse this author →KAKEN DB
Nagahama, Taro Browse this author →KAKEN DB
Kato, Yoshiki Browse this author
Takeguchi, Tatsuya Browse this author
Shimada, Toshihiro Browse this author →KAKEN DB
Issue Date: 21-Jan-2023
Publisher: Royal Society of Chemistry
Journal Title: Nanoscale advances
Volume: 5
Issue: 2
Start Page: 493
End Page: 502
Publisher DOI: 10.1039/d2na00829g
Abstract: We report the pyrolysis of copper-containing metal-organic frameworks under high pressure and the effect of the applied pressure on the morphology and electrocatalytic performance toward the oxygen-related reactions of the products. The high-pressure and high-temperature (HPHT) syntheses were performed under 5, 2.5, 1, and 0.5 GPa, and the Cu@C products were obtained except for the 2.5 GPa experiment. Copper formed a shell-like nanostructure on the carbon matrices during the 0.5 GPa experiment, whereas copper formed sub-nanometer sized particles in the carbon matrices with the increasing pressure. It is considered that the transportation of copper atoms by outgassing during the pyrolysis affects the morphology. Electrochemical measurements revealed that all samples exhibited activity for the oxygen reduction reaction (ORR). The 0.5 GPa-treated product also exhibited the oxygen evolution reaction (OER). The overall ORR/OER performance of this product was excellent among Cu-based bifunctional materials even though it did not contain cocatalysts such as nitrogen-doped carbon or other metal elements. The Cu(iii) species in the nano-thick copper shell structure provided the active sites for the OER.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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