Insight into the Electrochemical Oxidation Mechanism of Carbon Materials by Deuterium-Labeled Temperature-Programmed Desorption

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02833
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Gunma University
• Principal Investigator: Ishii Takafumi 群馬大学, 大学院理工学府, 助教 (50750155)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 炭素材料 / 電気化学的酸化 / 表面分析 / 燃料電池 / キャパシタ / エネルギー貯蔵材料

Outline of Final Research Achievements

In this study, the electrochemical oxidation behavior of carbon materials was investigated by D-TPD analysis. It was found that phenolic hydroxyl groups (Ph2), ethers, and carbonyls were preferentially formed on the carbon surface by electrochemical oxidation. It is generally believed that electrochemical oxidation proceeds from the edge sites. However, in the results of this study, carbon samples with fewer edge sites showed higher reactivity to electrochemical oxidation. We attempted to understand this electrochemical oxidation behavior by proposing two hypotheses. Future investigation of the validity of these hypotheses will lead to a better understanding of the electrochemical oxidation mechanism.

Free Research Field

エネルギー関連化学

Academic Significance and Societal Importance of the Research Achievements

炭素材料は電極材としてキャパシタ，燃料電池など多くの電気化学用途で利用されている．炭素材料は酸化反応に弱いという欠点があり，電気化学的酸化による炭素電極の劣化が問題視されている．本研究成果は，炭素エッジ面精密分析手法を用いて，水系電解液中での電気化学的酸化による炭素エッジ面の化学構造変化を追跡し，炭素材料の電気化学的酸化メカニズムを解明へ向けた知見を示すものである．この成果により，炭素材料の耐久性向上へ向けた材料設計指針を与えると期待される．