Development of wood-based carbon as supercapacitor electrodes recyclable for high CO2 storage material

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K12396
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 64030:Environmental materials and recycle technology-related
• Research Institution: Kyoto University
• Principal Investigator: HATA TOSHIMITSU 京都大学, 生存圏研究所, 講師 (10243099)
• Co-Investigator(Kenkyū-buntansha): 本間 千晶 地方独立行政法人北海道立総合研究機構, 森林研究本部 林産試験場, 主任主査 (70446334)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 木質バイオマス / CO2吸蔵 / 木質活性炭 / 透過電子顕微鏡 / ガス吸着測定 / リサイクル / ウルトラミクロ孔 / 電気二重層キャパシタ

Outline of Final Research Achievements

Physical activation using CO2 or steam is commonly used in the activation process, and has the advantage of being economical because it does not require a cleaning process. On the other hand, micropores are important for CO2 gas adsorption, which is a characteristic of porous carbon materials,and optimization of micropores and mesopores is said to be necessary for smooth diffusion of adsorbed substances in the pores. We obtained excellent values for the discharge capacity of Abies sachalinensis activated carbon obtained by steam activation, comparable to values in the literature. It was shown that it is possible to develop a high-performance electric double-layer capacitor carbon electrode from wood, which can absorb a large amount of CO2 in the atmosphere, leading to a solution to the global warming problem from both energy and environmental perspectives.

Free Research Field

木質炭素材料学

Academic Significance and Societal Importance of the Research Achievements

地球温暖化や化石資源枯渇問題の対策のため、CO2吸蔵材や環境にやさしいエネルギーデバイスの開発を早急に進める必要がある。本研究は、CO2吸着機能を兼ね備えたリサイクル可能な電気二重層キャパシタ電極(EDLC)という蓄電池を木質系バイオマスから実現することを目的とする。水蒸気賦活を行うことで木質炭素内に高次階層化が生じ、マクロ孔～ミクロ孔～ウルトラミクロ孔が連続的に繋がった高機能多孔質活性炭を生成した。CO2吸蔵機能を兼ね備えたリサイクル可能な電気二重層キャパシタ電極(EDLC)という蓄電池を木質系バイオマスというリサイクル可能な環境材料から実現した点で、社会的・学術的意義が極めて高い。