TY - JOUR
T1 - Impact of transition metal incorporation on the photocatalytic CO2reduction activity of polymeric carbon nitride
AU - Li, Jiahui
AU - Li, Keyan
AU - Du, Jun
AU - Yang, Hong
AU - Song, Chunshan
AU - Guo, Xinwen
N1 - Funding Information:
This work was supported by the Liaoning Revitalization Talents Program ( XLYC2008032 ).
Publisher Copyright:
© 2022 Elsevier Ltd.
PY - 2022/10
Y1 - 2022/10
N2 - Incorporation of transition metals in polymeric carbon nitride (CN) is an effective strategy to enhance its photocatalytic CO2 reduction activity, however, the difference of activity enhancement by incorporating different metals is not well understood. Herein, CN is modified with different transition metals by pyrolyzing the mixtures of urea and metal-organic frameworks (MOFs) to obtain MCN (M = Cu, Co, Ti or Fe). For each given type of metal-modified CN, the photocatalytic CO2 reduction activity is optimized by controlling the content of MOF precursor during pyrolysis. The optimized MCN delivers significantly enhanced CO evolution rate than pure CN, in the order of CN (83 μmol g-1 h-1) < CuCN (246 μmol g-1 h-1) < CoCN (326 μmol g-1 h-1) < TiCN (454 μmol g-1 h-1) < FeCN (490 μmol g-1 h-1). It is revealed that for CuCN and CoCN, Cu and Co are doped in CN. In contrast, for TiCN and FeCN, Ti and Fe exist as TiO2 and Fe2O3 forming Z-scheme heterojunctions with CN. The progressively improved photocatalytic activity corresponds to the increased specific surface area, CO2 adsorption capacity, visible light absorption as well as charge separation and transfer efficiency. Furthermore, we design and prepare bimetal incorporated CN through combining metal doping with heterojunction construction strategies, i.e., Cu doped CN/TiO2 and Co doped CN/Fe2O3, which exhibit further enhanced CO2 photoreduction performance with CO evolution rates of 613 and 718 μmol g-1 h-1, respectively. This work provides insight into the design and preparation of highly efficient CN-based photocatalytic materials.
AB - Incorporation of transition metals in polymeric carbon nitride (CN) is an effective strategy to enhance its photocatalytic CO2 reduction activity, however, the difference of activity enhancement by incorporating different metals is not well understood. Herein, CN is modified with different transition metals by pyrolyzing the mixtures of urea and metal-organic frameworks (MOFs) to obtain MCN (M = Cu, Co, Ti or Fe). For each given type of metal-modified CN, the photocatalytic CO2 reduction activity is optimized by controlling the content of MOF precursor during pyrolysis. The optimized MCN delivers significantly enhanced CO evolution rate than pure CN, in the order of CN (83 μmol g-1 h-1) < CuCN (246 μmol g-1 h-1) < CoCN (326 μmol g-1 h-1) < TiCN (454 μmol g-1 h-1) < FeCN (490 μmol g-1 h-1). It is revealed that for CuCN and CoCN, Cu and Co are doped in CN. In contrast, for TiCN and FeCN, Ti and Fe exist as TiO2 and Fe2O3 forming Z-scheme heterojunctions with CN. The progressively improved photocatalytic activity corresponds to the increased specific surface area, CO2 adsorption capacity, visible light absorption as well as charge separation and transfer efficiency. Furthermore, we design and prepare bimetal incorporated CN through combining metal doping with heterojunction construction strategies, i.e., Cu doped CN/TiO2 and Co doped CN/Fe2O3, which exhibit further enhanced CO2 photoreduction performance with CO evolution rates of 613 and 718 μmol g-1 h-1, respectively. This work provides insight into the design and preparation of highly efficient CN-based photocatalytic materials.
KW - Carbon nitride
KW - Doping
KW - Heterojunction
KW - Photocatalytic COreduction
KW - Transition metal
UR - http://www.scopus.com/inward/record.url?scp=85135708335&partnerID=8YFLogxK
U2 - 10.1016/j.jcou.2022.102162
DO - 10.1016/j.jcou.2022.102162
M3 - Article
AN - SCOPUS:85135708335
SN - 2212-9820
VL - 64
JO - Journal of CO2 Utilization
JF - Journal of CO2 Utilization
M1 - 102162
ER -