Hierarchical porous nitrogen doped three-dimensional graphene as a free-standing cathode for rechargeable lithium-oxygen batteries. (10th February 2016)

• Record Type: Journal Article
• Authors: He, Mu; Zhang, Peng; Liu, Li; Liu, Bao; Xu, Shan
• Is Part Of: Electrochimica acta. Volume 191(2016)
• Page Start: 90
• Page End: 97
• Publication Date: 2016-02-10
• Subjects: Three-dimensional graphene -- Nitrogen doping -- Oxygen reduction -- Li-O2 batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.01.026
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: A method is developed for efficient nitrogen doping and improved porous structure. Nitrogen doped three-dimensional graphene is first applied in lithium oxygen cell. This electrode exhibits hierarchical porous structure and high catalytic activity. The free-standing cathode shows high specific capacity and good cycling stability. Abstract: Nitrogen doped three-dimensional graphene (N-3DG) with improved catalytic activities and optimized pore structure is prepared through facile hydrothermal and subsequent annealing processes. When employed as a novel free-standing cathode for Li-O2 batteries, its special three-dimensional structure with increased active sites, large pore volume and numerous available macropores and mesopores effectively facilitates the discharge products deposition, oxygen diffusion and electrolyte infiltration. Compared with pristine three-dimensional graphene (3DG), N-3DG delivers a higher specific capacity of 7300 mAh g −1 at the current density of 50 mA g −1 and better cycling stability.