Co, Ni-based nanoparticles supported on graphitic carbon nitride nanosheets as catalysts for hydrogen generation from the hydrolysis of ammonia borane under broad-spectrum light irradiation

摘要: Abstract From the viewpoint of tailoring atomic and nanoscale structures semiconductors to enhance solar-to-hydrogen energy conversion, we employed an in-situ gas template-assisted co-polymerization route, where melamine 2,4,6-triaminopyrimidine were co-monomers NH4Cl was template, synthesize porous broad-spectrum light-responsive carbon nitride nanosheet (termed as CNN) species with increased π-electron availability. Then developed CNN-supported Co Ni nanoparticles (NPs) for catalytic hydrogen generation from aqueous ammonia borane (NH3BH3) under light irradiation (λ ≥ 420 nm) at room temperature. Though all Co-based catalysts had similar activities total turnover frequency (TOF) values 37.5–44.1 min−1 in dark, they exhibited significantly different enhanced photocatalytic activities. Remarkably, optimized catalyst a TOF value 123.2 min−1, exceeding reported non-noble metal catalysts. Moreover, CNN possessed C-substitution N, tunable narrow bandgaps 0.71–2.34 eV efficient separation photogenerated charge carriers. This resulted enriched electron density NPs apparent quantum yield 66.9% 420 nm.