Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Hydrogen Storage Properties of Zr-Based AB2-x Mx Metal Hydrides Made by Hydriding Combustion Synthesis (HCS)

자전연소합성법으로 제조한 Zr계 AB2-x Mx 금속수소화물의 수소저장특성

  • Hur, Tae Hong (Department of Metallurgical Engineering, Dong-A University) ;
  • Han, Jeong Seb (Department of Metallurgical Engineering, Dong-A University) ;
  • Kim, Jin Ho (Korea Institute of Ceramic Engineering & Technology)
  • 허태홍 (동아대학교 대학원 신소재공학과) ;
  • 한정섭 (동아대학교 대학원 신소재공학과) ;
  • 김진호 (한국세라믹 기술원)
  • Received : 2011.09.27
  • Published : 2012.03.25
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Abstract

This study investigated the hydrogen storage properties of Zr-Based $AB_{2-x}M_x$ metal hybride made by HCS (Hydriding Combustion Synthesis). The materials were prepared by HCS 80 wt% $AB_2$-15 wt% Mg-5 wt% Mm, HCS 80 wt% $AB_2$-20 wt% Mg and pure Zr-Based $AB_2$, These materials were activated at 298 K under 20 bar. Both HCS 80 wt% $AB_2$-20 wt% Mg and HCS 80 wt% $AB_2$-15 wt% Mg-5 wt% Mm were absorbed within 1 minute. In the case of the $AB_2$, it was perfectly absorbed within 6 minutes. Then, the materials were evaluated to obtain P-C-T (Pressure-Composition-Temperature) curves at 298K. As a result, the hydrogen storage capacity of HCS 80 wt% $AB_2$-20 wt% Mg, HCS 80 wt% $AB_2$-15 wt% Mg-5 wt% Mm and pure Zr-Based $AB_2$ were determined to be 1.2, 1.6 and 1.74 wt%, respectively. The activation energy and rate controlling step were calculated by the Johnson-Mehl Avrami equation. The activation energies of HCS 80 wt% $AB_2$-20 wt% Mg, HCS 80 wt% $AB_2$-15 wt% Mg-5 wt% Mm and pure Zr-Based $AB_2$ were 26.91, 20.45, and 60.41 kJ/mol, respectively. Also, the values of ${\eta}$ in the Johnson-Mehl Avrami equation for HCS 80 wt% $AB_2$-20 wt% Mg, HCS 80 wt% $AB_2$-15 wt% Mg-5 wt% Mm and pure Zr-Based $AB_2$ are 0.60, 0.51, and 0.44. So, the rate controlling steps which indicate hydrogen storage mechanism are an one dimensional diffusion process.

Keywords

Acknowledgement

Supported by : 동아대학교

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