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Journal Articles

Electrochemically driven specific alkaline metal cation adsorption on a graphene interface

Yasuda, Satoshi; Tamura, Kazuhisa; Kato, Masaru*; Asaoka, Hidehito; Yagi, Ichizo*

Journal of Physical Chemistry C, 125(40), p.22154 - 22162, 2021/10

Understanding electrochemical behavior of the alkaline metal cation-graphene interface in electrolyte is essential for understanding the fundamental electrochemical interface and development of graphene-based technologies. We report comprehensive analysis of the electrochemical behavior of both alkaline metal cations and graphene using electrochemical surface X-ray diffraction (EC-SXRD) and Raman (EC-Raman) spectroscopic techniques in which the interfacial structure of cations and the charging state and mechanical strain of the graphene can be elucidated. EC-SXRD and cyclic voltammetry demonstrated electrochemically driven specific adsorption and desorption of cations on the graphene surface involved in the dehydration and hydration process. This study provides new insight for understanding fundamental electrochemical behavior of the alkaline metal cation-graphene interface and contributes to the development of carbon-based novel applications.

Journal Articles

Incorporation of multinuclear copper active sites into nitrogen-doped graphene for electrochemical oxygen reduction

Kato, Masaru*; Muto, Marika*; Matsubara, Naohiro*; Uemura, Yohei*; Wakisaka, Yuki*; Yoneuchi, Tsubasa*; Matsumura, Daiju; Ishibara, Tomoko*; Tokushima, Takashi*; Noro, Shinichiro*; et al.

ACS Applied Energy Materials (Internet), 1(5), p.2358 - 2364, 2018/05

 Times Cited Count:4 Percentile:26.29(Chemistry, Physical)

Oral presentation

Study of Nafion molecules adsorption on Au(111) using SXS

Notsu, Hideo*; Umemura, Shun*; Tamura, Kazuhisa; Yagi, Ichizo*

no journal, , 

For more durable PEFC, the development of more active and durable catalyst must be required. For the purpose, the understanding of the interaction between catalyst surface and ionomer is needed. Cyclic voltammograms of Au single crystal electrode in electrolytes containing Nafion molecules are different from that of in sulfuric and perchloric acid solutions. It indicates that the phase transition process of the adsorbed Nafion molecules is different from that of sulfate and perchloride anions. However, the detail of surface process have not been understood. In this study, the adsorption process of Nafion molecule on a Au(111) electrode was monitored using SXS.

Oral presentation

Well-defined defect formation in monolayer graphene by ion bombardment and proton permeability analysis by electrochemical hydrogen pumping method

Yasuda, Satoshi; Terasawa, Tomoo; Yano, Masahiro; Ogawa, Hiroaki; Kato, Masaru*; Yagi, Ichizo*; Asaoka, Hidehito

no journal, , 

no abstracts in English

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