Abstract
Bismuth oxide (Bi2O3) 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 Bi2O3 microrods with a carbon coat (Bi2O3@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 Bi2O3@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.
Highlights
Asymmetric supercapacitors (ASCs) have attracted signi cant and ever-increasing attention as energy storage devices owing to their high power density and long cycle life.[4]
The CAU-17 metal–organic framework (MOF) precursor was synthesized via a solvothermal method according to our previous report.[20]
Bi2O3 microrods with a carbon coat (Bi2O3@C) was obtained by thermal treatment in nitrogen atmosphere and the heating temperature was optimized to be 500 C (ESI†)
Summary
Pollution and depletion of fossil fuels have caused environmental issues and an energy crisis, and it is urgent to develop environmentally friendly and efficient energy storage equipment.[1,2,3] Asymmetric supercapacitors (ASCs) have attracted signi cant and ever-increasing attention as energy storage devices owing to their high power density and long cycle life.[4]. MOF-derived Bi2O3@C microrods as negative electrodes for advanced asymmetric supercapacitors†
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