GDC-0994 Fig xA a A SEM image of

Further addition of H2S to 0.3% slightly improved the peak power density to 105 mW cm−2. From that point on, there were no significant variations when H2S concentration was increased to higher levels and a plateau of peak power density had been reached. In contrast, when the balance gas was switched from H2 to Ar that is inert, the 'GDC-0994' maximum power density was merely 45 mW cm−2 in 0.5% H2S + Ar.