Zn phthalocyanine/carbon nitride heterojunction for visible light photoelectrocatalytic conversion of CO 2 to methanol
Journal of Catalysis
Academic Press Inc.
School of Engineering
Zinc phthalocyanine/carbon nitride nanosheets photoelectrocatalysts were obtained by evaporation and calcination of the mixture of ZnPc and carbon nitride. It exhibits highly efficient synergistic function between PC-CO 2 RR and EC-CO 2 RR. The energy band matching between the ZnPc and carbon nitride results in the faster electrons transfer and less electron-hole pairs recombination. The optimized ZnPc/carbon nitride at a ratio of 0.1 wt% demonstrates high efficiency in photoelectrocalytic reduction of CO 2 under visible light, generating a major product of methanol at a yield of 13 μmol·cm −2 after 8 h. The efficiency of photoelectrocalytic reduction of CO 2 to methanol is 2.6 times as high as that of electrocatalytic CO 2 reduction reaction, and 5.9 times as high as that of photocatalytic CO 2 reduction reaction. The mechanism of the photoelectrocatalytic CO 2 reduction reaction to methanol was discussed in detail. © 2019 Elsevier Inc.