Abstract
Utilizing the reducibility of photogenerated electrons, graphene (GP) supported Co-P/GP catalysts were synthesized via the in situ synthesis strategy. XRD characterizations showed that the synthesized catalysts were amorphous and the TEM showed the catalysts were deposited on the graphene surface homogeneously. The X-ray photoelectron spectroscopy (XPS) of Co-P/GP catalyst indicated that Co and P were over Co and P elements the catalysts with. The Co-P/GP catalyst exhibited high photocatalytic activities for hydrogen evolution sensitized by Eosin Y (EY). Photoactivities under different wavelength were investigated. The highest rate of the H-2 evolution reached 24.5 mmol . h(-1) . g(Co)(-1) under visible light with wavelength longer than 420 nm. The apparent quantum efficiency (AQE) over Co-P/GP (5:1) catalyst under 430 nm illuminations was achieved up to 8.4%, which was 50% higher than the Co/GP catalyst.
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