Ultrasensitive Determination of L-Cysteine with g-C3N4@CdS-Based Photoelectrochemical Platform

L-cysteine, a component of the symmetric L-cystine, is essential in numerous biological activities. Thus, detecting cysteine rapidly, selectively, and sensitively tremendous interest. Herein, g-C3N4@CdS composites were employed as sensing elements photoelectrochemical platform for L-cysteine sensing. In this system, provided much better optoelectronic function than bare CdS materials owing to their high photon-to-current conversion efficiency excellent anti-photocorrosion properties. The innovative sensor has wide determination range 5 190 µM, very low detection limit 1.56 fast response time, good long-term stability (ca. 1 month). Without applying any separation procedures, concentration CySH was successfully detected human urine samples, which compatible with results chemiluminescence.