Ni-polymer nanogel hybrid particles: A new strategy for hydrogen production from the hydrolysis of dimethylamine-borane and sodium borohydride

Abstract

Efficient non-precious metal catalysts are crucial for hydrogen production from borohydride compounds in aqueous media via hydrogen atoms in water. A method for preparing magnetic polymer nanoparticles is developed in this study based on the chemical deposition of nickel onto hydrophilic polymer nanogels. High-resolution transmission electron microscopic and XPS analyses show that Ni exists mainly in the form of NiO in nanogels. Excellent catalytic activities of the nanoparticles are demonstrated for hydrogen generation from the hydrolysis of dimethylamine-borane and sodium borohydride in which the initial turnover frequencies (TOF) are 376 and 1919 h-1 , respectively. Kinetic studies also reveal an Arrhenius activation energy of 50.96 kJ/mol for the hydrolysis of dimethylamine-borane and 47.82 kJ/mol for the hydrolysis of sodium borohydride, which are lower than those catalyzed by Ru metal. Excellent reusability and the use of water for hydrogen production from dimethylamine-borane provide the additional benefit of using a hybrid catalyst. The principle illustrated in the present study offers a new strategy to explore polymer-transition metal hybrid particles for hydrogen energy technology.

Oleylamine‐Stabilized Copper(0) Nanoparticles: An Efficient and Low‐Cost Catalyst for the Dehydrogenation of Dimethylamine Borane

“…The observation of bulk metal precipitation at the end of the lifetime experiments suggests the deactivation to be because of agglomeration of nanoparticles. The initial apparent TOF values are comparable with the best heterogeneous catalyst and much higher than the majority of those of other heterogeneous and homogeneous catalysts reported up to now, such as Ru NPs/ZIF‐8, mer ‐[Ru(N 2 Me 4 ) 3 (acac)H], trans ‐[Ru(acac) 2 (OAm) 2 ], Pt 0 /OA@CNT, Pt 0 /DOA@CNT, and nanogel‐supported Ni particles (Table ).…”

Structural and catalytic properties of Ni–Co spinel and its composites

“…However, the use of expensive catalysts based on noble metals makes such a method to obtain clean energy unprofitable and hinders the development in this direction. Therefore, many scientists have proposed alternative catalysts that do not contain noble metals, such as: Co 3 O 4 hollow fibre [16], bimetallic Co-Ni-based complex catalyst [17][18][19], Nipolymer nanogel hybrid particles [20], chitosan-mediated Co-Ce-B nanoparticles [21], Co-B [22], Ni-Co-B hollow nanospheres [23], salicylaldimine-Ni complex supported on Al 2 O 3 [24], Cu-Fe-B nanopowders [25], hydroxyapatitesupported cobalt(0) nanoclusters [26] and many others. Various composite catalytic masses and composites have also been proposed: NaBH 4 -NH 3 BH 3 composite promoted by AlCl 3 [27], MgH 2 -LiNH 2 [28], Co-Co 2 B and Ni-Ni 3 B [29], CoCl 2 on PAN [30], Mg-oxide composites [31], CoB on SiO 2 [32], Co-B/glassy carbon and Co-B/graphite [33], CuFe 2 O 4 /RGO [34], Co@C [35], Co-W-P/carbon cloth [36], cellulose-based hydrogel-nanometal composites [37], magnetically recyclable [38] and many others.…”

Protonated Poly(ethylene imine)‐Coated Silica Nanoparticles for Promoting Hydrogen Generation from the Hydrolysis of Sodium Borohydride

“…The catalytic performance of the SiO 2 @H + PEI catalyst was evaluated with the rate of H 2 generation from catalyzed NaBH 4 hydrolysis. Different from metal catalysts which often give a nearly constant H 2 generation rate in the whole process of NaBH 4 hydrolysis or alcoholysis, nonmetal catalysts normally give gradually decreasing H 2 generation rate, making the calculation of H 2 generation rate complicated. To make the evaluation of catalytic activity of the catalysts easier, the average H 2 generation rate per gram catalyst for producing the first half amount of H 2 (HG 1/2 rate) was measured for each reaction.…”