Average capacities of ruthenium(IV) oxide have reached 650 F/g when in H2SO4 solution and annealed at temperatures lower than 200 °C.
ˈævɹɪdʒ kəpˈæsᵻɾiz ʌv ɹuːθˈiːniəm ɹˌoʊmən fˈoːɹ ˈɑːksaɪd hæv ɹˈiːtʃt sˈɪkshˈʌndɹɪd fˈɪfti ˈɛf slˈæʃ dʒˈiː wɛn ɪn ˈeɪtʃ tˈuː sˌoʊ fˈoːɹ səlˈuːʃən ænd ɐnˈiːld æt tˈɛmpɹɪtʃɚz lˈoʊɚ ðɐn tˈuːhˈʌndɹɪd dᵻɡɹˈiːz sˈiː.