• 文献标题:   A low-cost non-conjugated dicarboxylate coupled with reduced graphene oxide for stable sodium-organic batteries
  • 文献类型:   Article
  • 作  者:   WU DB, LUO K, DU SY, HU XL
  • 作者关键词:   organic electrode, sodium storage, sodium humate, low cost, sodiumion batterie
  • 出版物名称:   JOURNAL OF POWER SOURCES
  • ISSN:   0378-7753 EI 1873-2755
  • 通讯作者地址:   Huazhong Univ Sci Technol
  • 被引频次:   4
  • DOI:   10.1016/j.jpowsour.2018.07.067
  • 出版年:   2018

▎ 摘  要

Eco-efficient and renewable organic electrodes are considered to be a promising alternative for upcoming large-scale applications of low-cost energy storage systems. Here we report that cost-effective and green sodium humate (Na(2)HA) with non-conjugated carboxylate groups, can serve as a highly reversible anode material for sodium-organic batteries. Functionalized by reduced graphene oxide (rGO), the hybrid electrode delivers a highly reversible discharge capacity of 133 mAh g(-1) at a current density of 500 mA g(-1), achieving a capacity retention of 91.6% over 2000 cycles. The Na-cycling mechanism in Na(2)HA is proposed. Density functional theory calculations demonstrate that the low energy barriers for Na-ion insertion/extraction in Na(2)HA facilitate the charge transfer. Such findings may offer new possibilities for designing and enlarging eco-efficient and renewable organic compounds for sodium-organic batteries.