Showing papers by "Choong-Nyeon Park published in 2013"
TL;DR: In this paper, Mg-based hydride electrodes in alkaline solution were protected by coating them with hydrogen-permeable NAFION membranes, and the electrodes were fabricated by using Mg based hydrides synthesized by hydriding combustion (HC) technique.
5 citations
3 citations
TL;DR: In this article, point relaxations for the pressure composition isotherms were analyzed as a solid-state diffusion problem of hydrogen solutes from the gas phase provided in a limited amount by a pulse-like supply.
Abstract: Point relaxations for the pressure–composition isotherms were analyzed as a solid-state diffusion problem of hydrogen solutes from the gas phase provided in a limited amount by a pulse-like supply. For the large differential hydrogen storage, typical in the PCI plateau region, represented by small effective volume ratio λ parameter in the diffusion equation, the relaxation occurs much faster than in the galvanostatic or potentiostatic relaxations for the same chemical diffusivity values. The analysis was successfully applied to Mg/MgH2 system and the apparent chemical diffusivity and the hydrogen self-diffusivity were evaluated as a function of the state of hydrogen storage, in an analogous manner to the well-known electrochemical titration techniques. The increase in the apparent chemical diffusivity and hydrogen self-diffusivity in the plateau region with the increasing state of storage can be consistently explained by the lower hydrogen self-diffusivity in MgH2 than in Mg solid solution. The hydrogen s...
2 citations