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

Bismuth oxide (Bi(2)O(3)) 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(2)O(3) microrods with a carbon coat (Bi(2)O(3)@C). They exhibit ultrahigh specific capacity (1378 C g(−1) at 0.5 A g(−1)) and excellent cycling stability (93% retention at 4000 cycles) when acting as negative electrode material for advanced asymmetric SCs. The assembled Bi(2)O(3)@C//CoNi-LDH asymmetric supercapacitor device exhibits a high energy density of 49 W h kg(−1) at a power density of 807 W kg(−1). The current Bi-MOF-derived strategy would provide valuable insights to prepare Bi-based inorganic nanomaterials for high-performance energy storage technologies and beyond.