Abstract
Plasmonic nanocatalysis provides a unique approach of improving catalyst stability and catalytic activity for the photocatalytic CO2 conversion into valuable fuels. Herein, among many metals, pristine Cu nanoparticles (Cu NPs) driven through the localized surface plasmon resonance (LSPR) exhibit enhanced photocatalytic activity. Interestingly, different numbers of phenothiazine units bonded to the benzene ring and combined with Cu NPs show significantly different photocatalytic activities. Among them, Cu NPs embedded into triphenothiazine benzene (TPB) furnishes an improved photocatalytic activity of reducing CO2 to CO, yielding a CO evolution rate of 1308.8 µmol g-1h−1 without cocatalyst. The H2 and CH4 evolution rate of TPB-Cu nanosheet are not significantly different from that of pristine Cu NPs. This result was ascribed to the efficient separation of photoinduced hot charges derived from the unique concave structure and suitable conjugate system in the TPB nanosheet. This work reveals that plasmon assisted catalysis presents a new avenue for energy storage and carbon cycle processes.
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