Zinc-polyiodide redox flow battery(RFB)systems with highly soluble triiodide/iodide(I_(3)^(-)/I^(-))couples have demonstrated significantly enhanced energy densities.However,their low power density has limited their b...Zinc-polyiodide redox flow battery(RFB)systems with highly soluble triiodide/iodide(I_(3)^(-)/I^(-))couples have demonstrated significantly enhanced energy densities.However,their low power density has limited their broad application.In this work,MoS_(2)nanoplates were in situ grafted onto graphite felt(GF)surfaces to accelerate the I_(3)^(-)/I^(-)redox reaction.The hexagonal phase MoS_(2)with enlarged interlayer spacing can facilitate the diffusion of the electrolyte,and the defects on the MoS_(2)nanoplates can serve as very effective catalytic active sites.Cyclic voltammetry testing revealed the high catalytic performance of MoS_(2)in the I_(3)^(-)/I^(-)redox reaction.A non-flow cell with the MoS_(2)-modified GF serving as a positive electrode showed a higher energy efficiency than that of pristine GF;increases of about 10.2%and 10.9%at current densities of 30 mA cm^(-2)and 40 mA cm^(-2)were obtained with the optimized electrode,respectively.展开更多
基金National Key R&D Program of China(2016YFB0901500,2016YFB0101201)National Natural Science Foundation of China(21805141,11704114,61427901 and 51771094)+1 种基金Ministry of Education of China(B12015)Tianjin High-Tech(No.18JCZDJC31500)。
文摘Zinc-polyiodide redox flow battery(RFB)systems with highly soluble triiodide/iodide(I_(3)^(-)/I^(-))couples have demonstrated significantly enhanced energy densities.However,their low power density has limited their broad application.In this work,MoS_(2)nanoplates were in situ grafted onto graphite felt(GF)surfaces to accelerate the I_(3)^(-)/I^(-)redox reaction.The hexagonal phase MoS_(2)with enlarged interlayer spacing can facilitate the diffusion of the electrolyte,and the defects on the MoS_(2)nanoplates can serve as very effective catalytic active sites.Cyclic voltammetry testing revealed the high catalytic performance of MoS_(2)in the I_(3)^(-)/I^(-)redox reaction.A non-flow cell with the MoS_(2)-modified GF serving as a positive electrode showed a higher energy efficiency than that of pristine GF;increases of about 10.2%and 10.9%at current densities of 30 mA cm^(-2)and 40 mA cm^(-2)were obtained with the optimized electrode,respectively.
