MOF-derived Bi 2 O 3 @C microrods as negative electrodes for advanced asymmetric supercapacitors

Bismuth oxide (Bi O ) with high specific capacity has emerged as a promising negative electrode material for supercapacitors (SCs). Herein, we propose a facile metal-organic framework (MOF) derived strategy to prepare Bi O microrods with a carbon coat (Bi O @C). They exhibit ultrahigh specific capacity (1378 C g at 0.5 A g ) and excellent cycling stability (93% retention at 4000 cycles) when acting as negative electrode material for advanced asymmetric SCs. The assembled Bi O @C//CoNi-LDH asymmetric supercapacitor device exhibits a high energy density of 49 W h kg at a power density of 807 W kg . The current Bi-MOF-derived strategy would provide valuable insights to prepare Bi-based inorganic nanomaterials for high-performance energy storage technologies and beyond.