Highly Active Oxygen Evolution Reaction of NiMoO4 Sub‐1 nm Nanowires Boosts Luminol Electrochemiluminescence

Abstract In recent years, there has been an increasing research focus on the luminol–H 2 O electrochemiluminescence (ECL) system due to its ability to address the instability and toxicity of H 2 O 2 , which are common issues associated with the conventional luminol–H 2 O 2 ECL system. To enhance the ECL efficiency of the luminol–H 2 O system, researchers have developed electrocatalytic materials with exceptional oxygen evolution reaction (OER) properties to facilitate water electrolysis into O 2 to produce reactive oxygen species (ROS) and act as co‐reactant promoters. However, most of these materials are characterized by their nanoscale or microscale dimensions, resulting in relatively large sizes and low specific surface areas, which hinder the application of the luminol–H 2 O system. To address this challenge, nickel molybdate sub‐1 nm nanowires (NiMoO 4 S1 NWs) with a large specific surface area is synthesized that can offer many active sites to enhance the performance of the OER to boost the ECL of luminol. This study demonstrates that the large amount of ROS generated by the OER of NiMoO 4 S1 NWs play a crucial role in enhancing the ECL intensity of luminol. Finally, a NiMoO 4 S1 NWs‐based ECL biosensor for the highly sensitive detection of the nucleocapsid proteins of SARS‐CoV‐2 is successfully constructed.