Hydrogen storage kinetics of nanocrystalline and amorphous NdMg12-type alloy–Ni composites synthesized by mechanical milling

Author:

Zhang Yanghuan1,Cui Songsong1,Song Xiping2,Zhang Peilong3,Zhu Yongguo3,Cai Ying1

Affiliation:

1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources , Inner Mongolia University of Science and Technology, Baotou , China

2. State Key Laboratory for Advanced Metals and Materials , University of Science and Technology Beijing, Beijing , China

3. Whole Win (Beijing) Materials Sci. & Tech. Co. , Ltd., Beijing , China

Abstract

Abstract Nanocrystalline and amorphous NdMg11Ni + x wt.% Ni (x = 100, 200) composites were synthesized by mechanical milling, and their gaseous and electrochemical hydrogen storage kinetic performances were systematically investigated. Hydrogen absorption and desorption properties were investigated by means of a Sievert apparatus and a differential scanning calorimeter connected with an H2 detector. Electrochemical hydrogen storage kinetics of the as-milled alloys were tested by an automatic galvanostatic system. Results show that increasing Ni content significantly improves gaseous and electrochemical hydrogen storage kinetics. The improved gaseous hydrogen storage kinetics of the alloys are ascribed to the decrease in hydrogen desorption activation energy caused by increasing Ni content and milling time.

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

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