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<p>The extraction of chitin/chitosan from biowaste shrimp shells involves the heavy use of strong acids and alkaline solutions, resulting in a series of decomposed amino acids in the extraction waste. Herein, we demonstrate a new strategy to grow FeNi nanoalloys encapsulated in nitrogen-doped carbon nanotubes (3FeNi-NCNTs) at a high percentage by sintering the extracted amino acids, FeCl<sub>3</sub>, NiCl<sub>2</sub> and melamine at 900 ℃ in N<sub>2</sub>. The FeNi-NCNT exhibits a competitive limiting current density in oxygen reduction reaction (ORR) to the commercial 20% Pt/C, with the onset potential and half-wave potential at 0.98&#xa0;V and 0.84&#xa0;V versus RHE. The oxygen evolution reaction (OER) performance also rivals the RuO<sub>2</sub> catalyst, and the overpotential (E<sub>j</sub>=10 mAcm<sup>-2</sup> - E<sub>1/2</sub>) of as low as 0.76&#xa0;V, highlighting a green pathway to yield superior bifunctional catalysts at low cost. When used in zinc-air batteries (ZABs), the aqueous ZAB showed excellent cyclic and rate performance, together with the peak power density and specific capacity of 173.6 mW cm<sup>-2</sup> and 809.9 mAh g<sup>-1</sup> (corresponding to an energy density of XXX Wh kg<sup>-1</sup> based on the mass of consumed zinc); and the flexible ZAB with a polyacryl-amide hydrogel electrolyte also exhibited a high peak power density of 133 mWcm<sup>-2</sup> and a long cycle life of 140&#xa0;h, superior to the reference Pt/RuO<sub>2</sub>-based ZABs, highlighting a sustainable biowaste upcycling of shrimp shell valorization on energy storage.</p> Graphical Abstract <p></p>

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Bioderived FeNi encapsulated N-doped carbon nanotubes for high-performance ORR/OER bifunctional catalysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月13日

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  • Fan Li,
  • Pengyu Tan,
  • Degui Li,
  • Xiangqun Zhuge,
  • Kun Luo,
  • Yurong Ren,
  • Yimin Chen,
  • Yujia Luo,
  • Kaiwen Yang,
  • Jianwei Lu,
  • Dan Liu,
  • Weiwei Lei,
  • Aijing Ma

摘要

The extraction of chitin/chitosan from biowaste shrimp shells involves the heavy use of strong acids and alkaline solutions, resulting in a series of decomposed amino acids in the extraction waste. Herein, we demonstrate a new strategy to grow FeNi nanoalloys encapsulated in nitrogen-doped carbon nanotubes (3FeNi-NCNTs) at a high percentage by sintering the extracted amino acids, FeCl3, NiCl2 and melamine at 900 ℃ in N2. The FeNi-NCNT exhibits a competitive limiting current density in oxygen reduction reaction (ORR) to the commercial 20% Pt/C, with the onset potential and half-wave potential at 0.98 V and 0.84 V versus RHE. The oxygen evolution reaction (OER) performance also rivals the RuO2 catalyst, and the overpotential (Ej=10 mAcm-2 - E1/2) of as low as 0.76 V, highlighting a green pathway to yield superior bifunctional catalysts at low cost. When used in zinc-air batteries (ZABs), the aqueous ZAB showed excellent cyclic and rate performance, together with the peak power density and specific capacity of 173.6 mW cm-2 and 809.9 mAh g-1 (corresponding to an energy density of XXX Wh kg-1 based on the mass of consumed zinc); and the flexible ZAB with a polyacryl-amide hydrogel electrolyte also exhibited a high peak power density of 133 mWcm-2 and a long cycle life of 140 h, superior to the reference Pt/RuO2-based ZABs, highlighting a sustainable biowaste upcycling of shrimp shell valorization on energy storage.

Graphical Abstract