Synthesis of Ni/Au/Co trimetallic nanoparticles and their catalytic activity for hydrogen generation from alkaline sodium borohydride aqueous solution

Abstract

Alloyed Ni/Au/Co nanoparticles with negatively-charged Au, Co atoms, and positively-charged Ni atoms were prepared as effective catalysts for hydrolysis of NaBH4.

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

“…These results suggest that the as-prepared Rh10Ni90 BNPs are excellent catalysts for the hydrolysis of KBH4 because of their lower apparent activation energy compared with other reported catalysts, such as 51.2 kJ/mol for CoLa-Zr-B NPs [28], 52.0 kJ/mol for Co-αAl2O3-Cu catalysts [29], 55.6 kJ/mol for Co/alginate hydrogels [30], and 48.8 kJ/mol for Mo incorporated Co-Ru-B catalysts [31], etc. The apparent activation energy (E a ) of the BNPs for hydrogen generation from the hydrolysis of alkaline KBH 4 solution was calculated by using the Arrhenius method [9,17,27]. The catalytic activities of Rh 10 Ni 90 were enhanced with the increasing reaction temperature and a linear dependence between catalytic rates (in a logarithmic scale, ln k) and the reciprocals of temperature was observed (as shown in Figure 7).…”

“…It shows that the final hydrogen productivity of the BNPs decreases from 80% to 45%, with pH increasing from 12 to 14, as shown in Figure 6. The apparent activation energy (Ea) of the BNPs for hydrogen generation from the hydrolysis of alkaline KBH4 solution was calculated by using the Arrhenius method [9,17,27]. The catalytic activities of Rh10Ni90 were enhanced with the increasing reaction temperature and a linear dependence between catalytic rates (in a logarithmic scale, ln k) and the reciprocals of temperature was observed (as shown in Figure 7).…”

Preparation, characterization and catalytic performance of single-atom catalysts

“…Although the activities and durability of colloidal catalysts are usually lower than those of supported catalysts [19,24,29], they still exhibit several major advantages over those that are supported: (1) the intrinsic properties of metal colloidal catalysts can be relatively easily elucidated without the effect of the metal-support interaction; (2) the NCs with more uniform particle sizes can be obtained in the dispersed systems compared with those in the supported cases, especially under conditions of a high metal concentration, because the dispersed metal NCs can be easily concentrated by evaporating the solvent without changing the structures, in spite of the higher loading of metal on inorganic supports normally yields bigger particles with wider particle size dispersions; (3) high stability can be easily achieved for the colloidal catalysts owing to a good protection of the active sites by a protective agent. The present authors have successfully synthesized a series of colloidal NCs which possessed excellent catalytic activity for glucose oxidation [8,[56][57][58][59], NaBH4/KBH4 hydrolysis [60][61][62][63][64][65] or H2O2 decomposition [66]. More recently, Pd/Au [19,67,68], IrPd/Au [69] and Pt/Au [70] colloidal SACs have also been prepared by our group by using the galvanic replacement reaction or successive reduction method.…”

Enhanced H2 production from dehydrogenation of sodium borohydride over the ternary Co0.97Pt0.03/CeOx nanocomposite grown on CGO catalytic support

“…Compared to mono and bi-metallic counterparts, much better selectivity and high catalytic activity were demonstrated for the trimetallic composites, i.e., Ni 45 Co 45 Au 10 (ref. 29) and Ni 40 Fe 40 Pd 20 . 30 In the trimetallic composite, multiple co-ordinations amongst metals provide new active sites (geometric effect) and their intermetallic charge transfer changes the individual electronic properties (electronic effect).…”