Hydroxyapatite-supported cobalt(0) nanoclusters as efficient and cost-effective catalyst for hydrogen generation from the hydrolysis of both sodium borohydride and ammonia-borane

Rakap, Murat; Özkâr, Saim

doi:10.1016/j.cattod.2011.04.022

Cited by 152 publications

(41 citation statements)

References 73 publications

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“…It can be observed in Figure 6A, that the bare SPE was first examined in order to evaluate its suitability to detect hydrazine, with an analytical signal, unlike when the electrode was modified with Pd doped HAP where significant increase in current is observed demonstrating the catalytic role towards the material. In the study by BatchelorMcAuley et al [48], the application of pure Pd nanoparticle modified electrode the electrochemical oxidation of hydrazine was reported to occur at a peak potential at ~+0.2 V (vs. SCE). In this study the electrochemical oxidation of hydrazine was found to occur ~+0.5 V (vs. SCE) which indicates an overpotential is required to drive the electrochemical reaction which is likely due to a sparsely distributed Pd over the HAP.…”

Section: Application Of Pd 0 Doped Hapmentioning

confidence: 99%

High Yield Synthesis of Hydroxyapatite (HAP) and Palladium Doped HAP via a Wet Chemical Synthetic Route

et al. 2016

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Abstract:A novel procedure for the synthesis of both hydroxyapatite (HAP) and palladium doped HAP via a wet chemical precipitation method is described herein. X-ray Diffraction (XRD), Raman Spectroscopy, Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS) and Fourier Transform Infrared (FT-IR) Spectroscopy are utilised to characterise the synthesised material's morphology, structure and crystallinity. The developed synthetic protocol produces high purity HAP with an average yield of 83.7 (˘0.10)% and an average particle size of 58.2 (˘0.98) nm, such synthesis has been achieved at room temperature and within a time period of less than 24 h. Additionally, in order to enhance the overall conductivity of the material, a range of Pd (2, 4 and 6 wt %) metal doped HAP has been synthesised, characterised and, for the first time, applied towards the competitive electrocatalytic detection of hydrazine, exhibiting a linear range of 50-400 µM with a limit of detection (3σ) of 30 µM.

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Section: Application Of Pd 0 Doped Hapmentioning

confidence: 99%

High Yield Synthesis of Hydroxyapatite (HAP) and Palladium Doped HAP via a Wet Chemical Synthetic Route

et al. 2016

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“…Meanwhile, one new peak appeared at 300 nm with increasing reaction time, due to the formation of 4‐aminophenol. In general, NaBH 4 acts as a hydrogen source that releases hydrogen gas by hydrolysis at room temperature, and this process can be sped up by using a metal catalyst . The catalytic breakdown of BH 4 − by Pt NPs produces HPt and PtBH 3 − as reactive intermediates, which are believed to account for the conversion of 4‐nitrophenol to 4‐aminophenol.…”

Section: Resultsmentioning

confidence: 98%

Carboxylic acid Functionalized Cage‐Type Mesoporous Silica FDU‐12 as Support for Controlled Synthesis of Platinum Nanoparticles and Their Catalytic Applications

Deka

Budi

Lin

et al. 2018

Chemistry A European J

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Carboxylic acid functionalized 3D cage-type mesoporous silica FDU-12 with high surface area and pore volume was synthesized by a one-pot co-condensation method and used as support to synthesize Pt nanoparticles (NPs). The uniformly distributed COOH groups in the cage can control the growth of Pt NPs with high dispersion (Pt@CF-12). Pt@CF-12 was used as catalyst for the hydrolysis of ammonia borane to generate H and for the reduction of 4-nitrophenol to 4-aminophenol. The catalyst exhibits higher catalytic activity (H generation rate of 17.8 L min ) and lower activation energy of 30.67 kJ mol compared with other Pt-based silica catalysts due to the small size of the Pt NPs (3.5 nm) and cage-type porous structure of the support, which allowed easy diffusion of reactants. Pt@CF-12 has excellent durability, since the support prevented NP aggregation and leaching of NPs during catalysis. Pt@CF-12 can convert 93 % of 4-nitrophenol to 4-aminophenol within 10 min.

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“…This system was improved further by Rakap et al. , who synthesized a hydroxyapatite‐supported cobalt nanoparticle catalyst providing 25,600 turnovers in the hydrolysis of basic sodium borohydride. Bennici et al.…”

Section: Nonnoble Metal Catalysts: Cobalt (Co) and Nickel (Ni)mentioning

confidence: 99%

Heterogeneous and homogenous catalysts for hydrogen generation by hydrolysis of aqueous sodium borohydride (NaBH₄) solutions

Brack

Dann

Wijayantha

2015

Energy Science & Engineering

231

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It is clear that in order to satisfy global energy demands whilst maintaining sustainable levels of atmospheric greenhouse gases, alternative energy sources are required. Due to its high chemical energy density and the benign by-product of its combustion reactions, hydrogen is one of the most promising of these. However, methods of hydrogen storage such as gas compression or liquefaction are not suitable for portable or automotive applications due to their low hydrogen storage densities. Accordingly, much research activity has been focused on finding higher density hydrogen storage methods. One such method is to generate hydrogen via the hydrolysis of aqueous sodium borohydride (NaBH 4 ) solutions, and this has been heavily studied since the turn of the century due to its high theoretical hydrogen storage capacity (10.8 wt%) and relatively safe operation in comparison to other chemical hydrides. This makes it very attractive for use as a hydrogen generator, in particular for portable applications. Major factors affecting the hydrolysis reaction of aqueous NaBH 4 include the performance of the catalyst, reaction temperature, NaBH 4 concentration, stabilizer concentration, and the volume of the reaction solution. Catalysts based on noble metals, in particular ruthenium (Ru) and platinum (Pt), have been shown to be particularly efficient at rapid generation of hydrogen from aqueous NaBH 4 solutions. However, given the scarcity and expense of such metals, a transition metal-based catalyst would be a desirable alternative, and thus much work has been conducted using cobalt (Co) and nickel (Ni)-based materials to attempt to source a practical option. "Metal free" NaBH 4 hydrolysis can also be achieved by the addition of aqueous acids such as hydrochloric acid (HCl) to solid NaBH 4 . This review summarizes the various catalysts which have been reported in the literature for the hydrolysis of NaBH 4 .

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Hydroxyapatite-supported cobalt(0) nanoclusters as efficient and cost-effective catalyst for hydrogen generation from the hydrolysis of both sodium borohydride and ammonia-borane

Cited by 152 publications

References 73 publications

High Yield Synthesis of Hydroxyapatite (HAP) and Palladium Doped HAP via a Wet Chemical Synthetic Route

High Yield Synthesis of Hydroxyapatite (HAP) and Palladium Doped HAP via a Wet Chemical Synthetic Route

Carboxylic acid Functionalized Cage‐Type Mesoporous Silica FDU‐12 as Support for Controlled Synthesis of Platinum Nanoparticles and Their Catalytic Applications

Heterogeneous and homogenous catalysts for hydrogen generation by hydrolysis of aqueous sodium borohydride (NaBH₄) solutions

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Hydroxyapatite-supported cobalt(0) nanoclusters as efficient and cost-effective catalyst for hydrogen generation from the hydrolysis of both sodium borohydride and ammonia-borane

Cited by 152 publications

References 73 publications

High Yield Synthesis of Hydroxyapatite (HAP) and Palladium Doped HAP via a Wet Chemical Synthetic Route

High Yield Synthesis of Hydroxyapatite (HAP) and Palladium Doped HAP via a Wet Chemical Synthetic Route

Carboxylic acid Functionalized Cage‐Type Mesoporous Silica FDU‐12 as Support for Controlled Synthesis of Platinum Nanoparticles and Their Catalytic Applications

Heterogeneous and homogenous catalysts for hydrogen generation by hydrolysis of aqueous sodium borohydride (NaBH4) solutions

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Heterogeneous and homogenous catalysts for hydrogen generation by hydrolysis of aqueous sodium borohydride (NaBH₄) solutions