TY - JOUR
T1 - In-situ synthesis of ternary heterojunctions via g-C3N4 coupling with noble-metal-free NiS and CdS with efficient visible-light-induced photocatalytic H2 evolution and mechanism insight
AU - Wu, Qiong
AU - Lu, Dingze
AU - Kondamareddy, Kiran Kumar
AU - Ho, Wingkei
AU - Wang, Qiuping
AU - Zhang, Yuhao
AU - Zeng, Yimei
AU - Zhang, Boyu
AU - Xie, Lihao
AU - Zhao, Bang
AU - Wang, Zhennan
AU - Hao, Hongjuan
AU - Fan, Huiqing
AU - Wang, Hongmei
N1 - Publisher Copyright:
© 2022 Hydrogen Energy Publications LLC
PY - 2022/4/8
Y1 - 2022/4/8
N2 - The two-dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets based composites are prepared in the form of the NiS/g-C3N4, CdS/g-C3N4 and CdS/NiS/g-C3N4 using a facile and reliable method of chemical deposition. The TEM and HRTEM images demonstrated a spectacular representation of the 2D lamellar microstructure of the g-C3N4 with adequately attached CdS and NiS nanoparticles. The changes in crystallinity and the surface elemental valence states of composites with the incorporation of two metal sulphides are studied, which confirmed the formation of composites. The photocatalytic response of the composites was estimated by photodegradation of Rhodamine B (C28H31ClN2O3–RhB), and the ternary composite CdS/NiS/g-C3N4 samples exhibited the superior photocatalytic performance. Further, the free radical capture and electron paramagnetic resonance (EPR) spectroscopy experiments identified the main active species that contributed to the photocatalytic reaction. Besides, the samples’ photocatalytic performance was evaluated by photocatalytic hydrogen production. The stability of the performance-optimized composite was determined by employing cyclic experiments over five cycles. The CdS/NiS/g-C3N4 showed the highest efficiency of hydrogen production i.e. about 423.37 μmol.g−1.h−1, which is 2.89 times that of the pristine g-C3N4. Finally, two types of heterojunction structures were proposed to interpret the enhanced photocatalytic efficiency.
AB - The two-dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets based composites are prepared in the form of the NiS/g-C3N4, CdS/g-C3N4 and CdS/NiS/g-C3N4 using a facile and reliable method of chemical deposition. The TEM and HRTEM images demonstrated a spectacular representation of the 2D lamellar microstructure of the g-C3N4 with adequately attached CdS and NiS nanoparticles. The changes in crystallinity and the surface elemental valence states of composites with the incorporation of two metal sulphides are studied, which confirmed the formation of composites. The photocatalytic response of the composites was estimated by photodegradation of Rhodamine B (C28H31ClN2O3–RhB), and the ternary composite CdS/NiS/g-C3N4 samples exhibited the superior photocatalytic performance. Further, the free radical capture and electron paramagnetic resonance (EPR) spectroscopy experiments identified the main active species that contributed to the photocatalytic reaction. Besides, the samples’ photocatalytic performance was evaluated by photocatalytic hydrogen production. The stability of the performance-optimized composite was determined by employing cyclic experiments over five cycles. The CdS/NiS/g-C3N4 showed the highest efficiency of hydrogen production i.e. about 423.37 μmol.g−1.h−1, which is 2.89 times that of the pristine g-C3N4. Finally, two types of heterojunction structures were proposed to interpret the enhanced photocatalytic efficiency.
KW - Cadmium sulfide
KW - Carrier transfer
KW - Graphitic carbon nitride
KW - Nickel sulfide
KW - Photocatalytic mechanism
KW - Photocatalytic performance
UR - http://www.scopus.com/inward/record.url?scp=85126511298&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2022.02.153
DO - 10.1016/j.ijhydene.2022.02.153
M3 - 文章
AN - SCOPUS:85126511298
SN - 0360-3199
VL - 47
SP - 14063
EP - 14076
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 30
ER -
