The use of ultrasonic cavitation for near-surface structuring of robust and low-cost AlNi catalysts for hydrogen production

P. V. Cherepanov; I. Melnyk; E. V. Skorb; P. Fratzl; E. Zolotoyabko; N. Dubrovinskaia; L. Dubrovinsky; Y. S. Avadhut; J. Senker; L. Leppert; S. Kümmel; D. V. Andreeva

doi:10.1039/C5GC00047E

The use of ultrasonic cavitation for near-surface structuring of robust and low-cost AlNi catalysts for hydrogen production†

P. V. Cherepanov,^a I. Melnyk,^a E. V. Skorb,^b P. Fratzl,^b E. Zolotoyabko,^c N. Dubrovinskaia,^d L. Dubrovinsky,^e Y. S. Avadhut,^f J. Senker,^f L. Leppert,^g S. Kümmel^g and D. V. Andreeva*^a

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* Corresponding authors

^a Physical Chemistry II, University of Bayreuth, DE-95440 Bayreuth, Germany
E-mail: daria.andreeva@uni-bayreuth.de

^b Max Planck Institute of Colloids and Interfaces, DE-14424 Potsdam, Germany

^c Department of Materials Science and Engineering, Technion – Israel Institute of Technology, 32000 Haifa, Israel

^d Materials Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, DE-95440 Bayreuth, Germany

^e Bayrisches Geoinstitut, University of Bayreuth, DE-95440 Bayreuth, Germany

^f Inorganic Chemistry III, University of Bayreuth, DE-95440 Bayreuth, Germany

^g Theoretical Physics IV, University of Bayreuth, DE-95440 Bayreuth, Germany
E-mail: stephan.kuemmel@uni-bayreuth.de

Abstract

Ultrasonically induced shock waves stimulate intensive interparticle collisions in suspensions and create large local temperature gradients in AlNi particles. These trigger phase transformations at the surface rather than in the particle interior. We show that ultrasonic processing is an effective approach for developing the desired compositional gradients in nm-thick interfacial regions of metal alloys and formation of effective catalysts toward the hydrogen evolution reaction.

Green Chemistry

The use of ultrasonic cavitation for near-surface structuring of robust and low-cost AlNi catalysts for hydrogen production†

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