Carbon dots dominated photoelectric surface in titanium dioxide nanotube/nitrogen-doped carbon dot/gold nanocomposites for improved photoelectrochemical water splitting

Optimizing the performance of Auy/Nix/TiO2NTs photoanodes for photoelectrochemical water splitting

“… 62 The PL spectra of Ni x /TiO 2 NTs photoelectrodes showed the same peaks but with reduced intensity indicating lower rate of photoexcited e − /h + recombination and improved efficiency of charge separation which is beneficial in the PEC process. 43 Further reduction in the intensity was observed in Au y /Ni 20 /TiO 2 NTs photoelectrodes due to emerging trapping sites resulted from Au doping. The intensities of PL peaks of Ni x /TiO 2 NTs and Au y /Ni 20 /TiO 2 NTs samples were generally lower than pristine titania nanotubes.…”

“…19,42 The peaks at 2q = 38.2°, 40°, 52.8°, 70.4°and 76.1°corresponded to (002), (101), (102), ( 103) and (112) planes, respectively of metallic titanium, (JCPDS 44-1294), attributed to the metallic substrate. 43 Small peaks due to rutile as a minor phase was located at 2q = 27.2°, 35°, 53.85°, 55°and 68.8°characteristic of (110), (101), ( 200), (211), and (220) planes (JCDPDP 01-089-8304). 44 The anatase: rutile ratio was 2 : 1 in TiO 2 NTs sample suggesting enhanced performance in PEC due to improved hole transfer rate across TiO 2 NTs/ electrolyte interface.…”

Au Single Atom Supported on TiO2 Drives Hole Mitigation for the Enhanced Photooxidation of Hg0

“…The phenomenon revealed that photogenerated electrons were more inclined to accumulate at the surface than the bulk for 0.1% Au/TiO 2 . This resulted from the transport of photogenerated electrons from the TiO 2 ’s CBM to the Au NP’s Fermi level in energy accompanied by the electrons mitigated from the bulk to the Au NPs through their interface …”

“…This resulted from the transport of photogenerated electrons from the TiO 2 's CBM to the Au NP's Fermi level in energy accompanied by the electrons mitigated from the bulk to the Au NPs through their interface. 33 KPFM technology also demonstrates the surface potential difference (ΔV) of the photocatalysts before and after UV irradiation, as shown in Figure 4b−g. 34−36 In the dark, the surface potential of TiO 2 was 20 mV higher than that of the substrate due to the different Φ values.…”

Boosting Hydrogenation of Graphene Quantum Dot-Modified Photocatalysts: Specific Functionalized Modulation at Active Sites

“…Therefore, the electronic structure of the edge sites of GQDs can be effectively tuned through the surface functionalization strategy, regulating their charge transport capacity and facilitating the formation and modulation of functionalized active sites on the surface of composite photocatalysts . However, the as-prepared GQDs were always mixed with the precursor of target semiconductor catalysts for constructing hybrid catalysts through conventional hydrothermal or annealing processes, which do not retain the electronic structure of the specific edge sites. , …”