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Unravelling dynamic electronic coupling in oxygen-bridged Pt2 dual-atom sites for ultrastable and sensitive biosensing
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DOI：10.26599/NR.2026.94908536.png)
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Abstract
En 中文
The dysregulation of dopamine (DA) and hydrogen peroxide (H2O2) is critically implicated in neurological and psychiatric disorders, which highlights the urgent need for sensitive and selective in-situ monitoring. Current electrochemical sensors, however, are often limited by the structural and electronic constraints of conventional nanomaterials. Herein, we present an atomically dual-atom catalyst (DAC) of paired Pt atoms embedded in an N, Odoped carbon framework (Pt2-N4O2/CB), which functions as a remarkably durable and synergistic active center. In situ X-ray absorption near-edge structure (XANES) uncovers the dynamic interaction between electronic structure and catalytic pathway at the coupled Pt-O-Pt site. Density functional theory calculations further reveal the strong electronic interaction between the catalytic Pt2 center and adjacent N/O atom, which alters the electronic states, leading to an upshifted d-band center and weakened binding strength for reaction intermediates, thus boosting the biosensing performance. Compared to single-atom Pt catalyst (Pt-N2O2/CB), the dual-atom Pt2 catalyst (Pt2-N4O2/CB) achieves 1.37-fold and 6.79-fold enhancements in the detection sensitivity for DA and H2O2, respectively. Furthermore, the Pt2-N4O2/CB electrode also exhibits outstanding operational stability, retaining over 87% of its initial activity after 600 h. This work provides the potential of DAC as an effective platform for advancing electrochemical sensing and biomedical diagnostics.
Keywords:
dual atom catalyst
dynamic electronic coupling
electrochemical sensors
dopamine
hydrogen peroxide
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