TY - JOUR
T1 - Exceptional photocatalytic activities for CO2 conversion on Al–O bridged g-C3N4/Α-Fe2O3 z-scheme nanocomposites and mechanism insight with isotopesZ
AU - Wang, Jinshuang
AU - Qin, Chuanli
AU - Wang, Hongjian
AU - Chu, Mingna
AU - Zada, Amir
AU - Zhang, Xuliang
AU - Li, Jiadong
AU - Raziq, Fazal
AU - Qu, Yang
AU - Jing, Liqiang
N1 - Generated from Scopus record by KAUST IRTS on 2023-09-21
PY - 2018/1/1
Y1 - 2018/1/1
N2 - It's highly desired to design and fabricate effective Z-scheme photocatalysts by promoting the charge transfer and separation. Herein, we firstly fabricated the ratio-optimized g-C3N4/α-Fe2O3 nanocomposites by adjusting the mass ratio between two components through a simple wet-chemical process. The resulting nanocomposites display much high photocatalytic activities for CO2 conversion and phenol degradation compared to bare α-Fe2O3 and g-C3N4. Noteworthily, the photocatalytic activities are further improved by constructing Al–O bridges, by 4-time enhancement compared to those of α-Fe2O3. Based on the steady-state surface photovoltage spectra, transient-state surface photovoltage responses, photoelectrochemical I-t curves and the evaluation of produced [rad]OH amounts, the exceptional photoactivities of Al–O bridged g-C3N4/α-Fe2O3 nanocomposites are attributed to the significantly promoted charge transfer and separation by constructing the g-C3N4/α-Fe2O3 heterojunctions and the Al–O bridges. Moreover, the charge transfer and separation of this photocatalyst have been confirmed to obey the Z-scheme mechanism, as supported by the single-wavelength photocurrent action spectra and single-wavelength photoactivities for CO2 conversion. Furthermore, the mechanism of the photocatalytic CO2 conversion has been elaborately elucidated through the electrochemical reduction and the photocatalytic experiments especially with isotope 13CO2 and D2O, that the produced H atoms as intermediate radicals would dominantly induce the conversion of CO2 to CO and CH4.
AB - It's highly desired to design and fabricate effective Z-scheme photocatalysts by promoting the charge transfer and separation. Herein, we firstly fabricated the ratio-optimized g-C3N4/α-Fe2O3 nanocomposites by adjusting the mass ratio between two components through a simple wet-chemical process. The resulting nanocomposites display much high photocatalytic activities for CO2 conversion and phenol degradation compared to bare α-Fe2O3 and g-C3N4. Noteworthily, the photocatalytic activities are further improved by constructing Al–O bridges, by 4-time enhancement compared to those of α-Fe2O3. Based on the steady-state surface photovoltage spectra, transient-state surface photovoltage responses, photoelectrochemical I-t curves and the evaluation of produced [rad]OH amounts, the exceptional photoactivities of Al–O bridged g-C3N4/α-Fe2O3 nanocomposites are attributed to the significantly promoted charge transfer and separation by constructing the g-C3N4/α-Fe2O3 heterojunctions and the Al–O bridges. Moreover, the charge transfer and separation of this photocatalyst have been confirmed to obey the Z-scheme mechanism, as supported by the single-wavelength photocurrent action spectra and single-wavelength photoactivities for CO2 conversion. Furthermore, the mechanism of the photocatalytic CO2 conversion has been elaborately elucidated through the electrochemical reduction and the photocatalytic experiments especially with isotope 13CO2 and D2O, that the produced H atoms as intermediate radicals would dominantly induce the conversion of CO2 to CO and CH4.
UR - https://linkinghub.elsevier.com/retrieve/pii/S0926337317308810
UR - http://www.scopus.com/inward/record.url?scp=85029808798&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2017.09.042
DO - 10.1016/j.apcatb.2017.09.042
M3 - Article
SN - 0926-3373
VL - 221
SP - 459
EP - 466
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -