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Citation: YANG Gui-Ling, WANG Chun, YANG Xiao-Min, ZHAO Na, JIAO Xiao-Yan. Synergistic Effect of a Nonmetal and a Metal on the Electrochemical Properties of a Mg-Based Hydrogen Storage Alloy[J]. Acta Physico-Chimica Sinica, ;2010, 26(04): 833-839. doi: 10.3866/PKU.WHXB20100438 shu

Synergistic Effect of a Nonmetal and a Metal on the Electrochemical Properties of a Mg-Based Hydrogen Storage Alloy

1.
Institute of Applied Chemistry, Hebei North University, Zhangjiakou 075000, Hebei Province, P. R. China

Received Date: 17 November 2009
Available Online: 10 March 2010

The surface of an amorphous Mg45Ti3V2Ni50 alloy was modified with Ti, B, and a specific composite TiB by high energy ball-milling. Experimental results showed that after modification the electrochemical stability of the hydrogen storage alloy improved and the improvement for TiB was much more than that for Ti or B. The initial discharge capacity of the Mg45Ti3V2Ni50-TiB alloy electrode (mass ratio 2:1) was 529.4 mAh·g-1 and after 50 cycles the discharge capacity was 277.1 mAh·g-1. A synergistic effect between the metal and nonmetal was formed evidently not only between Ti and B in TiB but also between TiB and the Mg45Ti3V2Ni50 alloy. This synergistic effect enhanced the interaction between the modified layer and the Mg45Ti3V2Ni50 alloy. A new stereochemical pleats structure was formed by the synergistic effect between the metal and the nonmetal. The surface activity of the Mg45Ti3V2Ni50 alloy was increased and the electrochemical cycling stability improved greatly.
- Mg-based hydrogen storage alloy,
- Cycle stability,
- Surface modification,
- Synergistic effect
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