Beilstein J. Nanotechnol.2024,15, 475–489, doi:10.3762/bjnano.15.43
GQDs is still unclear. It is possible that electron–hole recombination, quantum effects, and surface defects in the functional groups of the GQDs are involved [18]. The XRD pattern of GQDs prepared from starch without iron and cobaltsalts is presented in Figure 2c. The diffraction peaks of the GQDs
Beilstein J. Nanotechnol.2014,5, 1167–1174, doi:10.3762/bjnano.5.128
) in 4 h with respect to the initial concentration of the added cobaltsalts was shown to be 5.6 times larger than that without graphene.
Keywords: cobaltsalts; earth-abundant catalyst; photocatalysis; photocatalytic hydrogen evolution; water-dispersible sulfonated-graphene; Introduction
artificial catalyst for photocatalytic hydrogen evolution [23], for example, was simply constructed in situ from earth-abundant cobaltsalts and CdTe quantum dots.
As a new carbon material with large surface area and excellent electrical properties, graphene has raised much attention since 2004 [24][25][26
, Co(TEOA)22+ is formed in situ and adsorbed at the surface or around the G-SO3 when cobaltsalts and G-SO3 are introduced into the hydrogen evolution system. Upon irradiation by visible light (525 nm LEDs as light source) for 4 h, the system is able to produce hydrogen with a TON up to 148 with the
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Figure 1:
FTIR (a) and XPS (b) spectra of GO, G-SO3 and G-SO3 after photocatalytic hydrogen evolution