Preparation of different thin film catalysts by direct current magnetron sputtering for hydrogen generation.

Gamze Bozkurt,Ayşe Bayrakçeken Yurtcan,Abdulkadir Özer

doi:10.3906/kim-2003-42

Gamze Bozkurt, Ayşe Bayrakçeken Yurtcan + Show 1 more

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https://doi.org/10.3906/kim-2003-42

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Abstract

In this study, thin films of Co, Ni, Pd, and Pt were prepared on Co 3 O 4 support material in pellet form using the direct current (DC) magnetron sputtering method for use as catalysts for hydrogen generation from NaBH 4 .Characterization of the catalysts was carried out using X-ray diffraction (XRD), scanning electronic microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). According to cross-sectional SEM images, catalyst thicknesses were observed in the range of approximately 115.3–495.8 nm. The particle sizes were approximately 25.0, 21.4, 33.9, and 9.5 nm for Ni-Co 3 O 4 , Co-Co 3 O 4 , Pd-Co 3 O 4 , and Pt-Co 3 O 4 catalysts, respectively. The increase in NaOH initial concentration provides an increase in the rate of hydrogen generation for Co, Ni, and Pd catalysts. A maximum hydrogen generation rate of 1653 mL/g cat .min was obtained for the Pt-Co 3 O 4 catalyst.

Highlights

The reduction of greenhouse gas emissions worldwide and the use of alternative fuels in transportation have become a forced option
In this study, Ni, Co, Pd, and Pt metals supported by a Co3O4pellet were prepared using a direct current (DC) magnetron sputtering method for hydrogen generation from the hydrolysis of NaBH4
According to the X-ray diffraction (XRD) results, the highest particle size obtained from a Pd-based catalyst was approximately 33.9 nm

Summary

Introduction

The reduction of greenhouse gas emissions worldwide and the use of alternative fuels in transportation have become a forced option. Compared to physical hydrogen storage methods, chemical hydrides have superior properties for hydrogen generation. Sodium borohydride (NaBH4), which is a hydrogen storage material suitable for hydrogen generation, is the most remarkable chemical hydride due to its high hydrogen content and adjustable hydrogen release properties [1,2,3,4,5,6,7,8,9,10,11]. In the alkaline solution of NaBH4 the catalysts act as an on/off switch to provide hydrogen release [2]. This situation enables hydrogen production at the desired time. The catalytic hydrolysis reaction of NaBH4 is as follows: NaBH4 + (2 + x) H2O catalyst NaBO2 .xH2O + 4H2 + heat (1)

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