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 (HO). 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 HO, which not only optimized the adsorption strength for HO but also improved the electron transfer rate, therefore improving the sensitivity for detecting HO. This study demonstrates the excellent electrocatalytic activity of K SA, which provides a promising sensing material for the detection of HO and lays the foundation for the application of alkali metal single-atoms in the field of electrochemical sensing.