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<p>The low energy density of conventional biomass-derived carbon supercapacitors remains the primary bottleneck hindering their large-scale application. To realize the comprehensive utilization of agricultural waste and develop high-performance supercapacitor electrode materials, this study adopted maize straw as the raw material. After activation treatment, biomass activated carbon (BAC) was prepared, on which Co/Ni(CO₃)₀.₅(OH) was grown in situ through a hydrothermal doping method. Electrochemical tests of the synthesized electrode material were conducted in a three-electrode system. The results show that at a current density of 1&#xa0;A g<sup>− 1</sup>, the specific capacitance of the electrode material reaches 902.7&#xa0;F g<sup>− 1</sup>, exhibiting excellent electrochemical performance. The assembled ASC device achieves an energy density of 15.3 Wh kg⁻¹ at the power density of 814&#xa0;W kg⁻¹ and after 10,000 long-term cycles, the capacitance retention rate remained at 99.27%, demonstrating excellent cycling performance.</p> Graphical Abstract <p></p>

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One-step hydrothermal synthesis of Co/Ni bimetallic co-doped biomass activated carbon for high-performance asymmetric supercapacitors

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Rongbo Li,
  • Haixia Yang,
  • Xiao Ma,
  • Xin Zhang,
  • Haokai Qin,
  • Yifan Fan,
  • Yuxin Wu

摘要

The low energy density of conventional biomass-derived carbon supercapacitors remains the primary bottleneck hindering their large-scale application. To realize the comprehensive utilization of agricultural waste and develop high-performance supercapacitor electrode materials, this study adopted maize straw as the raw material. After activation treatment, biomass activated carbon (BAC) was prepared, on which Co/Ni(CO₃)₀.₅(OH) was grown in situ through a hydrothermal doping method. Electrochemical tests of the synthesized electrode material were conducted in a three-electrode system. The results show that at a current density of 1 A g− 1, the specific capacitance of the electrode material reaches 902.7 F g− 1, exhibiting excellent electrochemical performance. The assembled ASC device achieves an energy density of 15.3 Wh kg⁻¹ at the power density of 814 W kg⁻¹ and after 10,000 long-term cycles, the capacitance retention rate remained at 99.27%, demonstrating excellent cycling performance.

Graphical Abstract