Please use this identifier to cite or link to this item:
Title: Binder-free graphene foams for O2 electrodes of Li-O2 batteries
Authors: Zhang, Wenyu
Zhu, Jixin
Ang, Huixiang
Zeng, Yi
Xiao, Ni
Gao, Yiben
Liu, Weiling
Hng, Huey Hoon
Yan, Qingyu
Keywords: DRNTU::Engineering::Materials::Nanostructured materials
Issue Date: 2013
Source: Zhang, W., Zhu, J., Ang, H., Zeng, Y., Xiao, N., Gao, Y., et al.(2013). Binder-free graphene foams for O2 electrodes of Li–O2 batteries. Nanoscale, 5(20), 9651-9658.
Series/Report no.: Nanoscale
Abstract: We report a novel method to prepare bind-free graphene foams as O2 electrodes for Li–O2 batteries. The graphene foams are synthesized by electrochemical leavening of the graphite papers, followed by annealing in inert gas to control the amount of structural defects in the graphene foams. It was found that the structural defects were detrimental to the processes of the ORR and OER in Li–O2 batteries. The round-trip efficiencies and the cycling stabilities of the graphene foams were undermined by the structural defects. For example, the as-prepared graphene foam with a high defect level (ID/IG = 0.71) depicted a round-trip efficiency of only 0.51 and a 20th-cycle discharge capacity of only 340 mA h g−1 at a current density of 100 mA g−1. By contrast, the graphene foam electrode annealed at 800 °C with ID/IG = 0.07 delivered a round-trip efficiency of up to 80% with a stable discharge voltage at 2.8 V and a stable charge voltage below 3.8 V for 20 cycles. According to the analysis on the electrodes after 20 cycles, the structural defects led to the quickened decay of the graphene foams and boosted the formation of side products.
DOI: 10.1039/c3nr03321j
Schools: School of Civil and Environmental Engineering 
School of Materials Science & Engineering 
Organisations: TUM CREATE Centre for Electromobility
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles
ERI@N Journal Articles
MSE Journal Articles

Citations 5

Updated on May 27, 2023

Web of ScienceTM
Citations 5

Updated on May 26, 2023

Page view(s) 10

Updated on Jun 3, 2023

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.