Nanocrystalline structure and electrochemical hydrogen storage properties of the as-milled Mg–V–Ni–Fe–Zn-based materials. (1st March 2023)

• Record Type: Journal Article
• Authors: Bu, Wengang; Peng, Wenlian; Liu, Qinghai; Li, Lei; Li, Wei; Dai, Xiaodong
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 19(2023)
• Page Start: 6937
• Page End: 6946
• Publication Date: 2023-03-01
• Subjects: V substitution for Mg -- Mg–Ni based alloy -- Electro-chemical characteristic -- Ball-milling; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.03.163
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Among the electrode materials for Ni-MH batteries, the Mg alloy electrodes such as MgNi, Mg2 Ni, REMg12, La2 Mg17 are considered the most suitable anode materials due to their high discharge capacity and low cost. However, the poor electrochemical cycling stability prevents its practical application. In this paper, Mg50-x Vx Ni45 Fe3 Zn2 (x = 0, 1, 2, 3, 4) + 50 wt% Ni alloys were prepared by partially replacing Mg with V and using mechanical ball milling techniques with amorphous and nanocrystalline structures. Electrochemical tests showed that the ball-milled alloy had good electrochemical uptake and release performance. The maximum release performance is achieved in the first cycle. After that, the discharge level and cycle stability increased significantly with increasing ball grinding time and V content. Highlights: Mg–V–Ni–Fe–Zn based alloys were prepared by vacuum induction melting. Ball milling is beneficial to improve electrochemical kinetics. Prolonging the milling time can improve the cycle stability. The as-milled alloys show active electrochemical properties at room temperature.