Table A1

Values used for the Critical index computation.

  Ru Sn Ti
Atomic mass (g/mol) 101 118 48
Element relative weight in the oxide form (−) 0.76 0.79 0.60
Supply risk (SR) 3.4 0.8 0.30
Economic importance (EI) 3.5 4.4 4.30
Electrode composition (%) 35 39 26

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