Catalytic Hydrolysis of Ammonia Borane via Cobalt Palladium Nanoparticles

Abstract

Monodisperse 8 nm CoPd nanoparticles (NPs) with controlled compositions were synthesized by the reduction of cobalt acetylacetonate and palladium bromide in the presence of oleylamine and trioctylphosphine. These NPs were active catalysts for hydrogen generation from the hydrolysis of ammonia borane (AB), and their activities were composition dependent. Among the 8 nm CoPd catalysts tested for the hydrolysis of AB, the Co(35)Pd(65) NPs exhibited the highest catalytic activity and durability. Their hydrolysis completion time and activation energy were 5.5 min and 27.5 kJ mol(-1), respectively, which were comparable to the best Pt-based catalyst reported. The catalytic performance of the CoPd/C could be further enhanced by a preannealing treatment at 300 °C under air for 15 h with the hydrolysis completion time reduced to 3.5 min. This high catalytic performance of Co(35)Pd(65) NP catalyst makes it an exciting alternative in pursuit of practical implementation of AB as a hydrogen storage material for fuel cell applications.

Composition-controlled catalysis of reduced graphene oxide supported CuPd alloy nanoparticles in the hydrolytic dehydrogenation of ammonia borane

“…However, more economical, yet more active Pd catalysts might be developed by preparing bimetallic Pd alloy nanoparticles in the presence of a first-row transition metal (Fe, Co, Ni, Cu). In this respect, we have recently reported that carbon supported CoPd [12] and reduced graphene oxide (RGO) supported NiPd [13] alloy NPs were highly active catalysts in the hydrolysis of AB. On the other hand, limited number of Cubased catalysts has been reported for the hydrolysis of AB as seen from Table 1.…”

In situ facile synthesis of ruthenium nanocluster catalyst supported on carbon black for hydrogen generation from the hydrolysis of ammonia-borane

“…So far, numerous monometallic catalysts, such as noble metals Rh [10e12], Pd [10,13], Ru [10,13e17] and Pt [10] and non-noble metals Fe [18,19], Ni [17,18,20,21], Co [11,18,21] have been evaluated. Besides monometallic catalysts, bimetallic ones, such as core/shell structured Ni 1Àx @Pt x [22] and Ni@Ru [23] nanoparticles and alloyed RuNi [17], CoPt [24], RuCo and RuCu nanoparticles [25], and trimetallic ones, such as CoeNieP [26] and Cu@FeNi [27], were also tested for AB hydrolysis. Ru nanoparticles have been identified as one of the most effective ones.…”

“…To be active in the hydrolysis of AB, catalysts are required to have small size (<10 nm), which causes an increase in the surface area and thus the number of active sites [24]. For this purpose, ligands are often used to control the size of catalysts and prevent their agglomeration.…”

Enhanced ammonia-borane decomposition by synergistic catalysis using CoPd nanoparticles supported on titano-silicates

“…11,13,14 The enhancement of the catalytic activity of the supported noble metal can be attained by different routes; i) increasing the metal dispersion on the support by the synthesis of very small NPs, 15 ii) alloying the noble metal with a transition metal, (which is also attractive due to the cost reduction of the catalysts) 11,16,17 and iii) supporting the NPs on an UV-Vis active support to upgrade the electron-transfer from the support to the NPs. 1, 18 In the present study, the synthesis of Pd and Co-Pd…”