Fabrication of Mg–Ni–Sn alloys for fast hydrogen generation in seawater

Se Kwon Oh, Tae Hee Cho, Min Joong Kim, Jeong Hoon Lim, Kwang Sup Eom, Do Hyang Kim, Eun Ae Cho, Hyuk Sang Kwon

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Abstract

Mg-2.7Ni-x wt.% Sn(x = 0–2) alloys were fabricated to promote hydrogen generation kinetics of Mg-2.7Ni alloy. The Sn in Mg-2.7Ni-Sn alloys exists as Mg2Sn phase at the grain boundary and solid solution at the Mg matrix. The Mg2Sn at the grain boundary acts as the initiation site for pitting corrosion and the dissolved Sn in the alloy causes pitting corrosion by locally breaking the surface oxide film in the Mg matrix in seawater. The Mg-2.7Ni-1Sn alloy showed an excellent hydrogen generation rate of 28.71 ml min−1 g−1, which is 1700 times faster than that of pure Mg due to the combined action of galvanic and intergranular corrosion as well as pitting corrosion in seawater. As the solution temperature was increased from 30 to 70 °C, the hydrogen generation rate from the hydrolysis of the Mg-2.7Ni-1Sn alloy was dramatically increased from 34 to 257.3 ml min−1 g−1. The activation energy for the hydrolysis of Mg was calculated to be 43.13 kJ mol−1.

Original languageEnglish
Pages (from-to)7761-7769
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number12
DOIs
Publication statusPublished - 2017 Mar 23

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Oh, S. K., Cho, T. H., Kim, M. J., Lim, J. H., Eom, K. S., Kim, D. H., Cho, E. A., & Kwon, H. S. (2017). Fabrication of Mg–Ni–Sn alloys for fast hydrogen generation in seawater. International Journal of Hydrogen Energy, 42(12), 7761-7769. https://doi.org/10.1016/j.ijhydene.2016.11.138