The reversible hydrogen storage performances of Mg50Co50 and Mg50Co45Pd5 alloys with body-centered cubic phase in electrochemical system. (16th March 2015)

• Record Type: Journal Article
• Authors: Zhang, Yao; Zhan, Leyu; Zhu, Yunfeng; Zhuang, Xiangyang; Guo, Xinli; Chen, Jian; Wang, Zengmei; Li, Liquan; Qu, Yi
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 10(2015)
• Page Start: 3944
• Page End: 3952
• Publication Date: 2015-03-16
• Subjects: Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.01.133
• Languages: English
• ISSNs: 0360-3199

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">The Mg₅₀Co₅₀ and Mg₅₀Pd₅Co₄₅ alloys with nano-crystalline body-centered cubic (BCC) structure were confirmed by means of XRD and TEM/SAED analyses. They are available in the anode of Ni–MH battery system, which can be reversibly charged and discharged with maximum capacity of 458 mAh g⁻¹. They exhibit greatly enhanced reversible hydrogen storage, differing from their tough dehydrogenation performances in solid–gas system [Y. Zhang et al., Journal of Alloys and Compounds 393 (2005) 147–153]. This phenomenon can be ascribed to the structural stability of Mg₅₀Co₅₀-based binary and ternary BCC alloys in the electrochemical reactions, and also the electro-catalysis activity. Introducing Pd into Mg₅₀Co₅₀ alloy lifts not only the initial discharge capacity, but also the high-rate discharge-ability. The exchange current density and hydrogen diffusion mobility can also be improved by the Pd additive in the ternary electrode alloys.</p> </sec> </abstract>