Sensitive detection of H2O2 released from cancer cells with electrochemiluminescence sensor based on electrochemically prepared polypyrrole@Ce: Dy tungstate/polyluminol

•Development of a sensitive non-enzymatic electrochemiluminescence sensor for detecting hydrogen peroxide.•The polypyrrole@Ce: Dy tungstate Nanocomposite is synthesized via a simple one-step electrochemically method.•Polypyrrole@Ce: Dy tungstate/polyluminol ECL sensor was successfully applied to sensitive detection of H2O2 released from cancer cells.•The sensor presented good reproducibility, repeatability, and long-term stability.•The sensor has an excellent detection limit of 0.198 pmol−1and linear range of 10 μmolL−1 to 1 pmol−1.