Preparation of Rh/Ni Bimetallic Nanoparticles and Their Catalytic Activities for Hydrogen Generation from Hydrolysis of KBH4

Abstract

ISOBAM-104 protected Rh/Ni bimetallic nanoparticles (BNPs) of 3.1 nm in diameter were synthesized by a co-reduction method with a rapid injection of KBH 4 solution. The catalytic activities of as-prepared BNPs for hydrogen generation from hydrolysis of a basic KBH 4 solution were evaluated. Ultraviolet-visible spectrophotometry (UV-Vis), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM) were employed to characterize the structure, particle size, and chemical composition of the resultant BNPs. Catalytic activities for hydrolysis of KBH 4 and catalytic kinetics of prepared BNPs were also investigated. It was shown that Rh/Ni BNPs displayed much higher catalytic activities than that of Rh or Ni monometallic nanoparticles (MNPs), and the prepared Rh 10 Ni 90 BNPs possessed the highest catalytic activities, with a value of 11,580 mol-H 2 ·h −1 ·mol-Rh −1 . The high catalytic activities of Rh/Ni BNPs could be attributed to the electron transfer effect between Rh and Ni atoms, which was confirmed by a density functional theory (DFT) calculation. The apparent activation energy for hydrogen generation of the prepared Rh 10 Ni 90 BNPs was about 47.2 ± 2.1 kJ/mol, according to a kinetic study.

Synthesis of Au-Pd Bimetallic Nanoflowers for Catalytic Reduction of 4-Nitrophenol

“…Interplanar spacings corresponding to the {111} planes of pure metallic Au (JCPDS file number 04-0784) and pure metallic Pd (JCPDS file number 87-0638) were determined, and found to be 0.235 and 0.224 nm, respectively. The measured interplanar distances of Au-Pd NFs (0.230 and 0.199 nm ) show a lower value compared with the interplanar spacing of Au metallic ones, and a higher value compared with the interplanar spacing of Pd metallic ones: 0.235 nm (lattice spacing of Au {111} plane) > 0.230 nm > 0.224 nm (lattice spacing of Pd {111} plane) and 0.204 nm (lattice spacing of Au {200} plane) > 0.199 nm > 0.194 nm (lattice spacing of Pd {200} plane), which is evidence of the incorporation of Pd in the Au lattice [ 22 , 23 , 24 ]. The HRTEM images ( Figure 1 e,f) also exhibited the {111} or {200} planes of Au-Pd alloy, indicating the formation of the Au-Pd alloy phase in the Au-Pd NFs (Au 1 Pd 1 core) and Au@Pd NFs because of the close matching between the lattice spacings of Au and Pd.…”

Understanding the structure and reactivity of NiCu nanoparticles: an atomistic model

“…Hence, an improvement of the electrocatalytic properties is required. Bimetallic materials have been explored to tune the chemical properties of the electrocatalysts to modify their activity for the reaction [13,14,15,16,17,18]. In this context, Cu seems an interesting choice to combine with Ni due to costs, corrosion stability in alkaline electrolytes and a weaker hydrogen adsorption (respect with Ni) [19].…”

Hydrogen release mechanism and performance of ammonia borane catalyzed by transition metal catalysts Cu-Co/MgO(100)

“…Beyond that, the tolerance of SCF, maximum force, optimization energy, and maximum displacement are 10 −5 Ha, 0.004 Ha/Å, 2 × 10 −5 Ha, and 0.005 Å, respectively. 24 All the calculation in this study were carried out using the Materials Studio 8.0 program.…”