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Chinese Science Bulletin

, Volume 57, Issue32, pp 42254228

First Online: 31 March 2012Received: 02 November 2011Accepted: 21 December 2011DOI: 10.1007-s11434-012-5070-x

Cite this article as: Wang, Y., Guang, X.
& Pan, M.
Chin.
Sci.
Bull.
2012 57: 4225.
doi:10.1007-s11434-012-5070-x

Abstract

Transition-metal borides MB0.5 M = Co, Mo, V were synthesized by high-speed mechanical ball-milling of the corresponding elemental metals and boron, and investigated as aqueous anode materials.
The as-synthesized borides can achieve an excellent discharge capacity, about twice that of their parent transition metals.
The metal boride electrodes also exhibit polarizations about 100300 mV lower than those of their parent metals.
The galvanostatic discharge curve of CoB0.5 shows a single discharge voltage plateau as a result of simultaneous electro-oxidation of elemental cobalt and-or amorphous cobalt boride.
Both MoB0.5 and VB0.5 show two well-defined voltage plateaus, corresponding to the electro-oxidation of the corresponding metal and boride.
These results show that the coexisting transition metal and boride in the metal borides co-activate each other in the ball-milling process, thereby significantly enhancing their electrochemical performances.

Keywordsborides, multi-electron reaction, high capacity, anode materialsThis article is published with open access at Springerlink.com

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Autor: YaDongWang - XianYongGuang - MuPan

Fuente: https://link.springer.com/



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