Potassium single-atoms anchoring on three-dimensional porous N-doped carbon material as sensing material for boosting electrochemical sensing of hydrogen peroxide

For the first time potassium single-atoms (K SA) are explored as the sensing material to boost electrochemical sensing of hydrogen peroxide (H 2 O 2 ). The N-doped carbon material with a three-dimensional porous structure (3D NG) was prepared using NaCl as the template, and K SA were anchored to the surface of 3D NG through high-temperature pyrolysis. The structure of K SA/3D NG was characterized by TEM, HAADF-STEM, XPS, and XRD. The results of electrochemical studies indicate that K SA play a crucial role in promoting the electrocatalytic reduction of H 2 O 2 , which not only optimized the adsorption strength for H 2 O 2 but also improved the electron transfer rate, therefore improving the sensitivity for detecting H 2 O 2 . This study demonstrates the excellent electrocatalytic activity of K SA, which provides a promising sensing material for the detection of H 2 O 2 and lays the foundation for the application of alkali metal single-atoms in the field of electrochemical sensing. Graphical Abstract