Synthesis of redox active hydroxide nanomaterials and the development of electrochemcial energy devices

2014 Fiscal Year Final Research Report

• Project/Area Number: 24310095
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nanomaterials/Nanobioscience
• Research Institution: National Institute for Materials Science
• Principal Investigator: MA RENZHI 独立行政法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, MANA研究者 (90391218)
• Co-Investigator(Renkei-kenkyūsha): TAKADA Kazunori 物質・材料研究機構, 電池材料ユニット, ユニット長 (40354401)
• Research Collaborator: LIU Xiaohe
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: ナノ機能材料 / グラフェン / ナノシート / 遷移金属水酸化物 / ナノ構造形成・制御 / 電気化学 / キャパシタ / 電極触媒

Outline of Final Research Achievements

New synthesis methods have been developed to incorporate various transition metal ions (Fe, Co, Ni, etc.) into layered double hydroxides (LDH). Through subsequent exfoliation of highly crystalline LDH samples,redox active hydroxide nanosheets have been obtained. Hetero-assembly of these positively charged LDH nanosheets, in combination with negatively charged two-dimensional counterparts represented by graphene oxide, can be realized via a simple electrostatic process. The resultant composite materials were tested as electrodes for supercapacitors, exhibiting significant increase in the capacity as well as superior performance in rapid charge and discharge rate. In addition, examination of the composites as electrocatalyst for the oxygen evolution reaction from the electrolysis of water demonstrated that they effectively suppressed the over-potential to an extremely small value (0.21 V).

Free Research Field

材料化学