Direct
methanol fuel cells (DMFCs) are considered as one of efficient
energy generation systems, while the high cost and unsatisfactory
poison resistance of the anode Pt catalysts largely hampered their
widespread applications. In this work, we present the design and construction
of flower-shaped Rh crystal-decorated three-dimensional (3D) hybrid
aerogels built from graphene and graphitic carbon nitride nanolayers
(Rh/G-CN) by means of solvothermal coassembly. Benefitting from the
3D cross-linked porosity, massive exposed active sites, uniform Rh
nanoflower distribution, and excellent conductivity, the optimized
Rh/G-CN aerogel exhibits a large electrochemically active surface
area of 161.7 m2 g–1, a high forward
peak current density of 701.0 mA mg–1, and an excellent
lifespan for methanol electro-oxidation, which are significantly superior
to those properties for Rh particle catalysts deposited on carbon
black, carbon nanotubes, graphene, and N-doped graphene matrixes.
A novel metal-organic framework [Zn0.5(L1)(4,4'-Bpy)0.5], (HU21, HU for Hohai University, L1 = 4-hydroxy-3-nitrobenzoic acid, 4,4'-bipyridine = 4,4'-Bpy), has been isolated through hydrothermal reaction. Single-crystal X-ray diffraction reveals the compound features a 1D fishbone-like chain. A fast adsorption rate of methylene blue with HU21 was observed in the dark, but under irritation the degradation rate of the dye was obviously increased. The degradation of methylene blue dye reached 248 mg/g under light irritation, and the photocatalytic activity reached 96.1%.
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