Voltammetric Detection of Singlet Oxygen Enabled by Nanogap Scanning Electrochemical Microscopy.

Despite the significance of singlet oxygen (O) in several biological, chemical, and energy storage systems, its voltammetric reduction at an electrode remains unreported. We address this issue using nanogap scanning electrochemical microscopy (SECM) in substrate-generation/tip-collection mode. Our investigation reveals a reductive process on the SECM tip at -1.