The development of non-precious metal electrocatalysts based on the composite of 3d transition metal hydroxide nanosheets and graphene

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K13296
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nanomaterials chemistry
• Research Institution: National Institute for Materials Science
• Principal Investigator: Ma Renzhi 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, グループリーダー (90391218)
• Co-Investigator(Renkei-kenkyūsha): SAKAI Nobuyuki 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, 主任研究員 (70431822)
• Research Collaborator: MA Wei ; SUN Pengzhan
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 電極触媒 / 遷移金属 / 水酸化物 / グラフェン

Outline of Final Research Achievements

Heterogeneous transition metal (e.g., Ni2+-Mn3+) layered double hydroxide (LDH) nanosheets were synthesized and directly mixed with graphene oxide (GO) or reduced graphene oxide (rGO) to form a superlattice structure via a charge-driven self-assembly process. The as-prepared composite material was explored as an electrocatalyst for oxygen evolution reaction (OER) in water splitting. In contrast with that graphene oxide showed very little catalytic activity, heterogeneous transition metal LDH nanosheets promoted oxygen generation highly efficiently. In particular, LDH/rGO composites with an optimized composition and structure exhibited excellent catalytic performance with a small overpotential of about 0.26 V and Tafel slope of about 46 mV/decade.

Free Research Field

材料化学