Nitrogen-Doped Graphene Quantum Dots for Remarkable Solar Hydrogen Production

• DOI: 10.1021/acsaem.0c00335
• Publication Date: 2020-05-06T21:27:42Z
• Authors: Kai-An Tsai; Ping-Yen Hsieh; Ting-Hsuan Lai; Chun-Wen Tsao; Hui Pan; Yan-Gu Lin; Yung-Jung Hsu
• Keywords: Photocurrent

We synthesized nitrogen (N)-doped graphene quantum dots (N-GQDs) using a top-down hydrothermal cutting approach. The concentration of N dopants was readily controlled by adjusting the source urea. When were incorporated into GQDs, visible absorption induced C–N bonds, which created another pathway for generating photoluminescence (PL). Time-resolved PL data revealed that carrier lifetime GQDs increased upon doping with optimized concentration. photoelectrochemical properties N-GQDs toward water splitting studied, and results showed 2N-GQDs prepared 2 g urea produced highest photocurrent. photocatalytic activity powder photocatalyst hydrogen production also examined under AM 1.5G illumination, showing substantial enhancement over pristine GQDs. Electrochemical impedance spectroscopy further significant improvement in charge dynamics reaction kinetics an as result doping.