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<p>Three-dimensional reduced graphene oxide (3D rGO) covalently coupled with spherical titanium dioxide has been proposed to accommodate hemoglobin. The as-prepared hemoglobin-based electrode was fabricated using the drip-casting method. The electrocatalytic efficacy and the photo-electrochemical conversion performance on hemoglobin-induced hydrogen peroxide reduction were evaluated using spectrometric and electrochemical methods. The efficient hemoglobin involving electrocatalysis was achieved with an onset potential of −&#xa0;35&#xa0;mV. The transformation of the substrate for integrated hemoglobin with a normalized rate constant of 7.1&#xa0;×&#xa0;10<sup>−5</sup>&#xa0;s<sup>−1</sup> was the key step in restraining the photoelectron catalysis/electrocatalysis. The unfavorable sensing performance of the hemoglobin-based electrode with a mean affinity to H<sub>2</sub>O<sub>2</sub> (Michaelis constant: 54.2 <i>μ</i>M) and a high H<sub>2</sub>O<sub>2</sub> detection limit (3.5&#xa0;×&#xa0;10<sup>−2</sup>&#xa0;mM) should be blamed for the negative influence of the collaborative interactions (i.e., covalent coupling and competitive complexation) of hemoglobin molecules with TiO<sub>2</sub> and O-containing groups onto non-coplanar rGO.</p> Graphical Abstract <p></p>

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An Investigation on the Impact of Adjacent Coordination on the Electro-catalytic H2O2 Reduction and the Photo-electrocatalytic Activity of TiO2-3D Reduced Graphene Oxide Nano-composite with Integrated Hemoglobin

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Xiao-Jun Xu,
  • Min Zhang,
  • Xiao Xiao Liu,
  • Han Zeng

摘要

Three-dimensional reduced graphene oxide (3D rGO) covalently coupled with spherical titanium dioxide has been proposed to accommodate hemoglobin. The as-prepared hemoglobin-based electrode was fabricated using the drip-casting method. The electrocatalytic efficacy and the photo-electrochemical conversion performance on hemoglobin-induced hydrogen peroxide reduction were evaluated using spectrometric and electrochemical methods. The efficient hemoglobin involving electrocatalysis was achieved with an onset potential of − 35 mV. The transformation of the substrate for integrated hemoglobin with a normalized rate constant of 7.1 × 10−5 s−1 was the key step in restraining the photoelectron catalysis/electrocatalysis. The unfavorable sensing performance of the hemoglobin-based electrode with a mean affinity to H2O2 (Michaelis constant: 54.2 μM) and a high H2O2 detection limit (3.5 × 10−2 mM) should be blamed for the negative influence of the collaborative interactions (i.e., covalent coupling and competitive complexation) of hemoglobin molecules with TiO2 and O-containing groups onto non-coplanar rGO.

Graphical Abstract