Figure 2 | Scientific Reports

Figure 2

From: Bifunctional hydrous RuO2 nanocluster electrocatalyst embedded in carbon matrix for efficient and durable operation of rechargeable zinc–air batteries

Figure 2

Hydration degree (x). The x values of ah-RuO2 and h-RuO2 were assumed to be 0.0 and 1.0, respectively. The OH− to O2− or Ru3+ to Ru4+ peak area ratios were used as a measure of the hydration degree. The x values of other RuO2 samples were estimated from the ratios obtained by interpolating two pre-fixed points of the XPS peak ratio versus x.

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