Aqueous Solution Synthesis of Pt–M (M = Fe, Co, Ni) Bimetallic Nanoparticles and Their Catalysis for the Hydrolytic Dehydrogenation of Ammonia Borane

Abstract

Platinum-based bimetallic nanocatalysts have attracted much attention due to their high-efficiency catalytic performance in energy-related applications such as fuel cell and hydrogen storage, for example, the hydrolytic dehydrogenation of ammonia borane (AB). In this work, a simple and green method has been demonstrated to successfully prepare Pt-M (M = Fe, Co, Ni) NPs with tunable composition (nominal Pt/M atomic ratios of 4:1, 1:1, and 1:4) in aqueous solution under mild conditions. All Pt-M NPs with a small size of 3-5 nm show a Pt fcc structure, suggesting the bimetallic formation (alloy and/or partial core-shell), examined by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray absorption fine structure (XAFS) analysis. The catalytic activities of Pt-M NPs in the hydrolytic dehydrogenation of AB reveal that Pt-Ni NPs with a ratio of 4:1 show the best catalytic activity and even better than that of pure Pt NPs when normalized to Pt molar amount. The Ni oxidation state in Pt-Ni NPs has been suggested to be responsible for the corresponding catalytic activity for hydrolytic dehydrogenation of AB by XAFS study. This strategy for the synthesis of Pt-M NPs is simple and environmentally benign in aqueous solution with the potential for scale-up preparation and the in situ catalytic reaction.

Role of Metal–Support Interactions, Particle Size, and Metal–Metal Synergy in CuNi Nanocatalysts for H2 Generation

“…[32][33][34] Moreover, these processes have been used widely as adequate model reactions to study the catalytic properties of novel catalysts. [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] The prepared CuNi supported nanocatalysts were first tested for the catalytic hydrolysis of AB to generate H 2 at 25-40 o C. Figure 4a shows the plots of mass activity and apparent activation energy calculated according to Arrhenius equation ( Figure S3) for AB hydrolysis catalyzed by CuNi/MCNS nanocatalysts as a function of the composition. It can be observed that the activity of the catalysts strongly depends on the Cu-Ni composition.…”

“…[32][33][34] Among the potential candidates for effective chemical hydrogen storage, ammonia borane (AB; NH 3 BH 3 ) and hydrous hydrazine (N 2 H 4 .H 2 O) with high hydrogen contents have been shown to be promising hydrogen carriers for storage and transportation. [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] Binary metallic nanocatalysts based on the combination of noble and non-noble metals have been widely investigated for hydrogen release from both AB and hydrazine. [35][36][37][38][39][40] Although noble metal-based catalysts have been shown to be effective in these reactions, the high cost hinders their widespread application, so that there is considerable current efforts devoted to explore efficient alternatives based on non-noble metals.…”

Porous shape memory polymers: Design and applications

“…REVIEW plasticized as indicated by increased breaking strain and decreased Young's modulus, Figure 18. 84 Electrical SMP conductivity has been proposed for biomedical 122 and industrial 123 neat SMP actuators stimulated by electric joule heating. Conductive SMPs have also demonstrated enhanced proliferation and osteogenic differentiation of C2C12 cells when compared to nonconductive substrates.…”

PVP-stabilized Ru–Rh nanoparticles as highly efficient catalysts for hydrogen generation from hydrolysis of ammonia borane

“…Ni@Ru coreeshell nanoparticles [4], NieRu alloy nanoparticles [5], RuCo and RuCu on ɤ-Al 2 O 3 [6], RuCu on graphene [7], Ru@Ni coreeshell nanoparticles [8], CueNi on MCM-41 [9], Ru@Co on graphene [10], CoNi@rGO [11], CuCo@MOF nanoparticles [12], Ni/Pt hollow nanospheres [13], Ag/Pd@nanofiber nanoparticles [14], Pt-M (M ¼ Fe, Co, Ni) nanoparticles [15], AuCo@MOF nanoparticles [16], PteCo@GO nanoparticles [17], NiPd@rGO nanoparticles [18], CuNi nanoparticles [19], and Cu@Co on rGO nanoparticles [20] are the examples of those type of catalysts. Very recently, poly(N-vinyl-2-pyrrolidone (PVP))-protected bimetallic nanoparticles, such as rutheniumepalladium [21], platinumeruthenium [22], palladiumerhodium [23], and palladiumeplatinum [24] nanoparticles, have been shown to be highly efficient catalysts for hydrogen generation from boron compounds providing remarkable results.…”