Nickel–platinum nanoparticles immobilized on graphitic carbon nitride as highly efficient catalyst for hydrogen release from hydrous hydrazine

Abstract

Here we demonstrate that the combination of NiPt alloy nanoparticles with a graphitic carbon nitride (g-C3N4) support facilitates H2 production from hydrous hydrazine in an alkaline solution under moderate conditions.

Hydrogen Production from Ammonia Borane over PtNi Alloy Nanoparticles Immobilized on Graphite Carbon Nitride

“…To gain the valence state of Pt and Ni, X-ray photoelectron spectroscopy (XPS) analysis was employed for Pt 0.5 Ni 0.5 /g-C 3 N 4 , and the result is illustrated in Figure 3, which presents the characteristic peaks for Pt and Ni, thus implying the coexistence of both metals. The binding energy (BE) of C and N in Pt 0.5 Ni 0.5 /g-C 3 N 4 were in accordance with the previous reported literatures about g-C 3 N 4 ( Figure S2) [50][51][52]. As given in Figure 3a, the BE observed at 852.5 and 869.9 eV were ascribed to the Ni 2p 3/2 and Ni 2p 1/2 of metallic Ni, respectively.…”

“…Elemental analysis revealed that the composition of C, H, and N of g-C3N4 was 34.71 wt%, 1.89 wt%, and 61.47 wt%, respectively. As displayed in Table S1, Figure S1, the Brunner−Emmet−Teller (BET) specific areas of PtNi/g-C3N4 was around 10 m 2 /g, which was close to the values reported in the literature [51,52]. Figure 1 shows the XRD patterns of PtNi/g-C3N4 with different contents.…”

“…A series of peaks detected in 1200-1600 cm −1 were identified as the stretching modes of aromatic CN heterocycles. In addition, the broad absorption ranging from 3000 to 3400 cm −1 was attributed to the stretching mode of O-H (adsorbed water molecules) and N-H (amino groups) [31][32][33][34][35][36]51,52]. To gain the valence state of Pt and Ni, X-ray photoelectron spectroscopy (XPS) analysis was employed for Pt0.5Ni0.5/g-C3N4, and the result is illustrated in Figure 3, which presents the characteristic peaks for Pt and Ni, thus implying the coexistence of both metals.…”

“…Additionally, investigating the construction of bi-metal NPs in g-C 3 N 4 as well as the exploration of the synergistic effect between them are also of outmost importance. Hence, in this work, we focused on the construction of PtNi with different ratios immobilized on g-C 3 N 4 , preparing via the direct pyrolysis of melamine under nitrogen atmosphere [51,52], through a simple impregnation and co-reduction method under an ambient atmosphere. The resulting materials were evaluated as catalysts towards the hydrogen production from AB hydrolysis dehydrogenation under mild conditions.…”

Metal–Organic Frameworks for Energy

“…Anhydrous hydrazine (>98%) is explosive upon exposure to a metal surface, making it difficult to apply for hydrogen storage. [81][82][83][84][85][86][87][88][89] In 2013, ZIF-8 was used as a support to immobilize welldispersed Ni-Pt bimetallic NPs with different Ni/Pt ratios, which exhibited high catalytic performance for the selective dehydrogenation of hydrous hydrazine in an alkaline aqueous solution (Figure 7). Hydrous hydrazine may be a great carrier for the storage and transportation of H 2 with remarkable advantages such as the ease of recharging, high safety, and the availability of current infrastructures for recharging liquid fuels, and the release of N 2 (no need of recycling) besides H 2 .…”