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Ultrahigh pressure-induced modification of morphology and performance of MOF-derived Cu@C electrocatalysts
| 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 |
| URI: | http://hdl.handle.net/2115/87978 |
| 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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