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<p>Cu − Bi bimetallic material with excellent electrochemical performance was successfully fabricated on iron foam via a one-stop microwave method. Under the optimal microwave power, heating time, and metal molar ratio, metallic Bi presents a needle-like morphology, interconnects to form a network, and is coated with Bi. This unique structure endows the Cu − Bi bimetal with the best electrochemical performance. Meanwhile, metallic Fe undergoes redox reactions in the alkaline electrolyte, which further enhances the capacitance value. The electrode prepared under the optimal synthesis conditions achieves an impressive areal capacitance value of 7.55 F cm<sup>−2</sup> when tested at 1 A cm<sup>−2</sup>, and it maintains 77.47% of its initially measured capacitance even after undergoing 15,000 long-term charge–discharge cycles, demonstrating excellent electrochemical stability. The assembled asymmetric supercapacitor device retains 84.1% of its original capacitance after 20,000 cycles. A power density value of 1185 μW cm<sup>−2</sup> is realized when the energy density reaches 766.96 μWh cm<sup>−2</sup>.</p>

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Self-supported Cu−Bi bimetallic anode on iron foam with high areal capacitance for asymmetric supercapacitors

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Shuangyi He,
  • Weiwei Zhao,
  • Shuai Zhang,
  • Tianbao Li,
  • Jujie Luo

摘要

Cu − Bi bimetallic material with excellent electrochemical performance was successfully fabricated on iron foam via a one-stop microwave method. Under the optimal microwave power, heating time, and metal molar ratio, metallic Bi presents a needle-like morphology, interconnects to form a network, and is coated with Bi. This unique structure endows the Cu − Bi bimetal with the best electrochemical performance. Meanwhile, metallic Fe undergoes redox reactions in the alkaline electrolyte, which further enhances the capacitance value. The electrode prepared under the optimal synthesis conditions achieves an impressive areal capacitance value of 7.55 F cm−2 when tested at 1 A cm−2, and it maintains 77.47% of its initially measured capacitance even after undergoing 15,000 long-term charge–discharge cycles, demonstrating excellent electrochemical stability. The assembled asymmetric supercapacitor device retains 84.1% of its original capacitance after 20,000 cycles. A power density value of 1185 μW cm−2 is realized when the energy density reaches 766.96 μWh cm−2.