Which mechanism limits the maximum volumetric energy density achievable in a compressed hydrogen storage tank?

💡 Explanation

When hydrogen is compressed and stored at high pressure, hydrogen embrittlement occurs because hydrogen atoms diffuse into the metal lattice, weakening the material and reducing the allowable stress. Therefore embrittlement limits pressure, which in turn limits volumetric density, rather than heat buildup, cooling, or punctures that address other storage challenges.

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