Oxygen Reduction Reaction Mechanism of Nitrogen-Doped Graphene Derived from Ionic Liquid

She, Yiyi1; Chen, Jinfan2; Zhang, Chengxu1; Lu, Zhouguang3; Ni, Meng4; Sit, Patrick H. -L.2; Leung, Michael K. H.1,5

10.1016/j.egypro.2017.12.508

2017

1876-6102

PROCEEDINGS OF THE 9TH INTERNATIONAL CONFERENCE ON APPLIED ENERGY

142

1319-1326

Cardiff, United kingdom

SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS

ELSEVIER SCIENCE BV

It is of great significance to develop N-doped carbon materials possessing high catalytic activity, excellent durability and low cost for oxygen reduction reaction (ORR) due to imperative for energy devices with high energy density such as fuel cell and metal-air batteries. Herein N-doped graphene is prepared by annealing a homogeneous mixture of graphene oxide and ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) in nitrogen atmosphere. By entrapping effect, the ionic liquid serves as both nitrogen source and restacking protectant in formation of high quality N-doped graphene sheets. Electrochemical characterizations reveal that the obtained N-doped graphene possesses excellent electro-catalytic properties for ORR in alkaline condition. The microstructure and ORR catalytic activities are highly sensitive to calcination temperature and the optimal temperature is 900 degrees C. Density functional theory analysis indicates from the atomic point of view that N atoms with different configurations have different effects on the ORR performance enhancement. Pyridinic N exhibits the highest ORR catalytic activity followed by graphitic N depending on the number of active sites. Based on the experimental and simulation results, the beneficial properties of the as-prepared N-doped graphene for ORR are ascribed to the superior conductivity of graphene, high nitrogen doping content and high proportion of the active graphitic and pyridinic N species. (C) 2017 The Authors. Published by Elsevier Ltd.

Metal-free catalysts carbon materials heteroatom doping oxygen reduction reaction density functional theory

其他

英语

CPCI-S ; EI

CityU SRG Fund[7004166]

Energy & Fuels

Energy & Fuels

WOS:000452901601074

20180704789242

Characterization ; Density functional theory ; Doping (additives) ; Electrolytic reduction ; Fuel cells ; Graphene ; Ionic liquids ; Nitrogen ; Oxygen ; Secondary batteries

Ore Treatment:533.1 ; Secondary Batteries:702.1.2 ; Fuel Cells:702.2 ; Chemical Products Generally:804 ; Probability Theory:922.1 ; Materials Science:951

Web of Science

1.City Univ Hong Kong, Sch Energy & Environm, Abil R&D Energy Res Ctr, Hong Kong, Peoples R China
2.City Univ Hong Kong, Sch Energy & Environm, Hong Kong, Peoples R China
3.South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
4.Hong Kong Polytech Univ, Dept Bldg & Real Estate, Hong Kong, Peoples R China
5.City Univ Hong Kong, Shenzhen Res Inst, Shenzhen, Guangdong, Peoples R China

She, Yiyi,Chen, Jinfan,Zhang, Chengxu,et al. Oxygen Reduction Reaction Mechanism of Nitrogen-Doped Graphene Derived from Ionic Liquid[C]. SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS:ELSEVIER SCIENCE BV,2017:1319-1326.