2023/02/23

Chemical modification of carbon edge sites using trimethylaluminum to enhance the oxidation resistance of carbon materials https://doi.org/10.1016/j.carbon.2023.02.059 As the oxidation of carbon materials proceeds from chemically reactive carbon edge sites, increasing the chemical stability of carbon edge sites is expected to increase the oxidation resistance. In this study, we developed a method for enhancing the chemical stability of carbon materials by modifying the carbon edge sites with chemically stable metal oxides. We focused on aluminol as a potentially stable metal oxide and introduc...続きを読む »

2022/12/07

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2022/12/01

What can we learn by analyzing the edge sites of carbon materials? https://doi.org/10.7209/carbon.010406 Because the chemical features of carbon materials strongly depend on the number and the type of edge sites, it is crucial to analyze them in order to understand their performance at the molecular level. For the analysis of carbon edge sites, temperature programmed desorption (TPD) has often been used, because it is simple but effective. Recently, a new type of TPD apparatus was developed by our group which can reach a TPD temperature as high as 1800 °C and has a very high sensitivity for th...続きを読む »

2022/09/01

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2022/07/20

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2022/06/13

Estimation of the spatial distribution of carbon edge sites in a carbon structure using H2 desorption kinetics in temperature programmed desorption https://doi.org/10.1016/j.carbon.2022.06.006 This study aims to elucidate the role of hydrogen desorption profiles obtained through temperature programmed desorption (TPD) analysis of carbon materials for revealing their carbon edge sites. Accordingly, the H2 desorption profiles of several carbon materials, such as activated carbon, carbon black, reduced graphene oxide (rGO), phenol resin carbon, graphite, high-temperature treated carbon, and carbo...続きを読む »

2022/05/03

Modulation of the electronic state of carbon thin films by inorganic substrates https://www.sciencedirect.com/science/article/pii/S0008622322003578?via%3Dihub The control of the electronic states of carbon-based materials is of great importance for the widespread use of carbon materials as electronic devices and catalysts. This article reports a novel method of controlling the electronic states of carbon-based materials by establishing covalent bonds between inorganic support materials and carbon thin films. Carbon thin films of 1 nm thickness were grown on inorganic substrates (Al2O3, AlN, an...続きを読む »

2022/03/23

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2022/03/07

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2022/01/07

Preparation of Chemically Structure-Controlled BN-Doped Carbons for the Molecular Understanding of Their Surface Active Sites for Oxygen Reduction Reaction https://pubs.acs.org/doi/abs/10.1021/acscatal.1c04806 BN-doped carbons have been reported to exhibit higher oxygen reduction reaction (ORR) activities than single-atom-doped carbons. However, the structures of these BN-doped carbons as well as the mechanism underlying their catalytically active sites had not been elucidated. In the BN-doped carbons reported so far, B and N exist in a disordered manner within the carbon structure. Therefore,...続きを読む »