Abstract
Graphite carbon nitride (g-C3N4) supported PtNi alloy nanoparticles (NPs) were fabricated via a facile and simple impregnation and chemical reduction method and explored their catalytic performance towards hydrogen evolution from ammonia borane (AB) hydrolysis dehydrogenation. Interestingly, the resultant Pt0.5Ni0.5/g-C3N4 catalyst affords superior performance, including 100% conversion, 100% H2 selectivity, yielding the extraordinary initial total turnover frequency (TOF) of 250.8 molH2 min−1 (molPt)−1 for hydrogen evolution from AB at 10 °C, a relatively low activation energy of 38.09 kJ mol−1, and a remarkable reusability (at least 10 times), which surpass most of the noble metal heterogeneous catalysts. This notably improved activity is attributed to the charge interaction between PtNi NPs and g-C3N4 support. Especially, the nitrogen-containing functional groups on g-C3N4, serving as the anchoring sites for PtNi NPs, may be beneficial for becoming a uniform distribution and decreasing the particle size for the NPs. Our work not only provides a cost-effective route for constructing high-performance catalysts towards the hydrogen evolution of AB but also prompts the utilization of g-C3N4 in energy fields.
Highlights
With the ever-growing consumption of fossil energy, accompanied with serious environmental issues, searching for green, sustainable, abundant, and alternative energy sources is of burgeoning urgency [1,2]
The synthesis process of PtNi/g-C3N4 is schematically emerged in Scheme 1
G-C3N4 was prepared via a direct pyrolysis route employing melamine as precursor
Summary
With the ever-growing consumption of fossil energy, accompanied with serious environmental issues, searching for green, sustainable, abundant, and alternative energy sources is of burgeoning urgency [1,2]. As a clean energy source, has attracted significant research interest owing to its distinctive merits such as producing only water as a by-product and possessing more energy density than that of fossil fuels [3,4,5]. The exploration and seek for hydrogen storage materials with outstanding performance remains a challenging issue. Tremendous efforts, in the past decades, have been made to explore and design hydrogen storage materials such as hydrazine, formic acid, and ammonia borane and so forth [7,8,9,10,11,12,13]. Among various hydrogen storage materials conducted, ammonia borane (AB), a white solid with excellent
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