Over the past years, researchers have revealed that coupling Pcs with other nanomaterials is an effective solution to improve the performance of such hybrid materials. Nevertheless, the majority of previously reported PEC sensors employing Pcs have relied on the mechanism of photoinduced electron transfer from Pcs to a semiconductor, succeeded by electron transfer from the semiconductor to an electrode. Our research group, however, has recently reported a novel PEC sensing approach that employs Pcs, resulting in the generation of 1 O2 upon illumination. Coupling Pcs with metal plasmonic nanoparticles such as AuNPs has received a wide attention because of their strong absorption and concentration of visible light through their surface plasmon resonance (SPR) property which results in the enhancement of 1 O2 generation by Pcs. Wichmann et al. reported that the 1 O2 generation efficiency of Zinc Pc is enhanced by nearly an order of magnitude when it is linked with AuNPs. Different shapes and sizes of AuNPs linked with Pcs following different strategies have been reported. However, such hybrid materials are typically used in photodynamic therapy (PDT), photooxidation reactions and to enhance the photophysical and non-linear optical properties of Pcs. In this work, we successfully couple Pc with AuNPs for the PEC sensing of phenolic compound.