3D flower-like molybdenum disulfide modified graphite felt as a positive material for vanadium redox flow batteries. Issue 29 (4th May 2020)

• Record Type: Journal Article
• Authors: Wang, Lei; Li, Shuangyu; Li, Dan; Xiao, Qinhao; Jing, Wenheng
• Is Part Of: RSC advances. Volume 10:Issue 29(2020)
• Page Start: 17235
• Page End: 17246
• Publication Date: 2020-05-04
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra02541k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The open flower-like structure facilitates vanadium ion transport. The capacity and efficiency of a battery using MoS2 /GF are dramatically increased. Abstract : 3D flower-like molybdenum disulfide microsphere modified graphite felt (MoS2 /GF) with excellent electrocatalytic activity and redox reversibility for the VO 2+ /VO2 + couple is successfully fabricated by a facile hydrothermal method. The results show that the hydrothermal reaction time has a deep influence on the MoS2 structure; an open 3D flower-like MoS2 structure with a layer spacing of 0.63 nm is uniformly grafted on the GF surface for a reaction time of 36 h. With the presence of MoS2, the total resistance (1.58 Ω) and charge transfer resistance (0.01 Ω) of MoS2 /GF-36 are smaller than that of the heat treated GF (2.04 Ω and 11.27 Ω, respectively), indicating that the electrode has better conductivity and more favorable electron transfer ability. As expected, a significant increase in the capacity and energy efficiency is obtained with the MoS2 /GF-36 electrode. These satisfactory results are attributed to the 3D flower-like structure on the surface of the electrode, which increases the contact area between the electrode and the electrolyte. More importantly, the MoS2 /GF electrode with excellent stability has great application prospect in vanadium redox flow batteries (VRFBs).