Hydrothermal synthesis of uranium dioxide and graphene composite and its application as an additive for uranium-dioxide-based accident tolerant fuel

A novel kind of composite constructed by uranium dioxide and reduced graphene oxide was developed via a one-step hydrothermal reduction method, named as UO2@G

Dezhi Zhang; Yingru Li; Rui Gao; Bingqing Li; Zhenliang Yang; Biaojie Yan; Xuxu Liu; Zhiyi Wang; Qiqi Huang; Hao Tang; Yiming Ren; Rui Li; Tao Gai; Xinchun Lai

2021

Scholarcy highlights

  • A novel kind of composite constructed by uranium dioxide and reduced graphene oxide was developed via a one-step hydrothermal reduction method, named as UO2@G
  • The introduction of graphene oxide to the reaction system brought significant changes: in the control experiment without GO, the reductant of ethylenediamine itself could only reduce uranyl ions to mainly U3O8, and the final solid products appear in the form of flakes; by introducing GO to the system, the final products are pure UO2 in homogenous nanospheres
  • By employing UO2@G as an additive in the UO2 fuel pellet, the thermal conductivity is increased by 35.4%, which is significantly higher than that of the pellet prepared by mixing UO2 powders and commercial graphene nanosheets
  • The simulation results show that the core temperature of the pellet containing the UO2@G composite additives is much lower than that of the one without UO2@G composite additives, showing the potential as novel kind of accident tolerant fuel
  • A novel composite constructed by UO2 nanospheres and RGO sheets is prepared from uranyl and GO dispersion via a hydrothermal reaction
  • When using as additive in UO2 ATF, the composite shows more obviously enhancing effect on the thermal conductivity by help reduced graphene oxide sheets distribute in the UO2 ceramic matrix

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