Multifunctional Au–Co@CN Nanocatalyst for Highly Efficient Hydrolysis of Ammonia Borane

Abstract

A magnetically recyclable carbon nitride supported Au−Co nanoparticles (Au−Co@CN) displayed exceedingly high photocatalytic activity for hydrolysis of aqueous ammonia borane (NH 3 BH 3 , AB) solution. Combined with a synergetic effect between Au and Co nanoparticles, the Motty−Schottky effect at the metal−semiconductor interface remarkably facilitated the catalytic performance of the Au−Co@CN catalyst on the hydrolysis of AB. The TOF value of Au−Co@CN catalyst is 2897 mol H 2 mol −1 metal h −1 at 298 K under visible light irradiation, which is more than 3 times higher than that of the benchmarked catalyst, PVP-stabilized Au@Co nanoparticles.

Efficient catalytic hydrolytic dehydrogenation of ammonia borane over surfactant-free bimetallic nanoparticles immobilized on amine-functionalized carbon nanotubes

“…3), which was similar to the previous reports [73,74]. In our experiments, the reduction of Co 2þ ions by NaBH 4 generated metallic Co, which was easily oxidized in the air.…”

“…Compared to the stable activities of AuCo/CNT-2 and Au@AuCo/CNT in the five runs, the activity of AuCo/CNT-1 i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y x x x ( 2 0 1 5 ) 1 e1 0 after the first run was lowered; however, its activity kept constantly in the rest four runs. This phenomenon was likely to result from the metastable state of AuCo alloy NPs in the in situ synthesis process [73,74]. In order to further explore the stability/durability of the catalysts, the time of duration of the activity test was remarkably extended.…”

Magnetic RuCo nanoparticles supported on two-dimensional titanium carbide as highly active catalysts for the hydrolysis of ammonia borane

“…However the large-scale use of hydrogen is hindered by the difficulty of storing and transporting it in compressed or liquefied form because of its low density [1,2]. Thus, finding a safe and efficient storage material is necessary [3]. Chemical hydrides have been the focus of significant research interest because of their high gravimetric and volumetric storage capacity [4].…”

“…Moreover, catalyst supports have been applied to improve the catalytic activity and stability of the metal NPs by alleviating the agglomeration of metal NPs and improving their dispersion by support effects [3,20]. Metal oxides, activated carbons, xonotlite, hydroxyapatite, graphitic carbon nitride, and metal-organic frameworks have been employed as catalyst supports to stabilize Ru based NPs for AB hydrolysis [6,9e13,15,21,22].…”

In situ redox strategy for large-scale fabrication of surfactant-free M-Fe2O3 (M = Pt, Pd, Au) hybrid nanospheres

“…In order to lower down the overall cost to meet the increasing demands in industry for noble metals, it seems urgent to improve their catalytic efficiency. Research shows that if noble metals are supported on substrates like metal oxides [ 16,17], metal sulfides [18][19][20][21], zeolites [22], metal organic frameworks (MOFs) [23][24][25][26][27] or carbon material s [28][29][30], the as-obtained hybrids could show much better catalytic performance than noble metals themselves. An appropriate substrate can effectively disperse and protect the active centers, and moreover by utilizing substrate…”