text: The two reactions in the HyS cycle are as follows:
  # HSO → HO + SO + ½ O          (thermochemical, T > 800 °C)
  # SO + 2 HO → HSO + H          (electrochemical, T = 80-120 °C)
  : Net reaction: HO → H + ½ O
  Sulfur dioxide acts to depolarize the anode of the electrolyzer. This results in a significant decrease in the reversible cell potential (and, therefore, the electric power requirement) for reaction (2). The standard cell potential for reaction (2) is -0.158 V at 298.15 K, compared to -1.229 V for the electrolysis of water (with oxygen evolution as the anodic reaction).