Indexed by:
Abstract:
Thermo-driven photocatalytic CO2 hydrogenation is studied for NiOx/Nb2O5 from the point of CO2 and H-2 adsorption behavior. Photothermal synergistic and Ni modification dramatically changed the electron transfer behavior of CO2 adsorption (CO2 (ads)) and H-2 (ads) via regulating Fermi level and providing Ni-0 and V(O)s adsorption sites, respectively. The H-2 (ads) at Ni-0 site donates electrons to NiOx/Nb2O5 (pre-oxidized) and CO2 (ads) at V(O)s-Nb5+ or Ni-0 site accepts electrons from NiOx/Nb2O5 (pre-reduced), while NiOx/Nb2O5 displayed excellent photocatalytic activities. Furthermore, in situ DRIFTS results suggested that CO2 (ads) will form two reaction pathways: (1) CO2 (ads) at Ni-0 site directly hydrogenated with H atoms (H-2 molecule dissociates at Ni-0 to form two H-atoms) to generate CH4 and C2H6 through COOH intermediate; (2) CO2 (ads) form dimer CO2 . CO(2)(delta- )species at V(O)s-Nb5+ site, and it will be further disproportioned to produce CO and CO(3)(delta- )species, then CO(3)(delta- )species are gradually hydrogenated to form CH4 and C2H6. Moreover, increasing the number of CO2/H-2 molecules accepts/donates electrons will also improve the reduction degree of CO2 . This work offers a new explanation for photothermal synergistic.
Keyword:
Reprint 's Address:
Email:
Version:
Source :
APPLIED SURFACE SCIENCE
ISSN: 0169-4332
Year: 2022
Volume: 592
6 . 7
JCR@2022
6 . 3 0 0
JCR@2023
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:91
JCR Journal Grade:1
CAS Journal Grade:2
Cited Count:
WoS CC Cited Count: 22
SCOPUS Cited Count: 19
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0