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<p>A novel method for the preparation of a homogeneous Ni-doped microalgae-based biochar material Ni-f-BC was established by combining biological feed from marine microalgae with soluble nickel salts (at an optimized concentration of 40&#xa0;mg/L NiCl<sub>2</sub>) and successive carbonization with programmed temperature pyrolysis under N<sub>2</sub> flow. A uniform distribution of Ni with an average size of approximately 10&#xa0;nm was identified by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), and energy-dispersive X-ray spectroscopy (EDS) analyses. Successively, a biochar-coated electrode (Ni-f-BC/GCE) was prepared by the ultrasonic dispersion of the biochar in <i>N</i>-methyl-2-pyrrolidone (1&#xa0;mg/mL) onto a glassy carbon electrode. A sensitive H<sub>2</sub>O<sub>2</sub> sensor was developed based on our biochar materials with very good electrochemical performance, namely, with excellent electrocatalytic oxidation ability, a low detection limit of 0.39&#xa0;μM in the physiological pH range (pH 7–8) and a rapid response time of 2.0&#xa0;s. Notably, this sensor still exhibited good recovery rates of more than 90%, even in complex environments.</p> Graphical Abstract <p></p>

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A novel biochar from Ni-fed picochlorum eukaryotum for use as a high-performance enzyme-free electrochemical sensor of hydrogen peroxide

  • 期刊论文

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  • 发表日期：

    2026年1月27日

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  • Hongyu Gan,
  • Yun Tang,
  • Shuyuan Yang,
  • Keren Liu,
  • Manna Huang,
  • Yiqian Wan

摘要

A novel method for the preparation of a homogeneous Ni-doped microalgae-based biochar material Ni-f-BC was established by combining biological feed from marine microalgae with soluble nickel salts (at an optimized concentration of 40 mg/L NiCl2) and successive carbonization with programmed temperature pyrolysis under N2 flow. A uniform distribution of Ni with an average size of approximately 10 nm was identified by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), and energy-dispersive X-ray spectroscopy (EDS) analyses. Successively, a biochar-coated electrode (Ni-f-BC/GCE) was prepared by the ultrasonic dispersion of the biochar in N-methyl-2-pyrrolidone (1 mg/mL) onto a glassy carbon electrode. A sensitive H2O2 sensor was developed based on our biochar materials with very good electrochemical performance, namely, with excellent electrocatalytic oxidation ability, a low detection limit of 0.39 μM in the physiological pH range (pH 7–8) and a rapid response time of 2.0 s. Notably, this sensor still exhibited good recovery rates of more than 90%, even in complex environments.

Graphical Abstract