They conclude that a major drawback with electrolysis is due to its use of electricity as an input, which restricts the efficiency of electrical generation. No heat supported electrolysis was investigated in the paper (see Fig. \ref{905348}). The operational simplicity of electrolyzer systems represents a tradeoff against this lower performance. Investigation of the declining free energy of water formation as the temperature rises suggests that steam electrolysis could significantly improve the efficiency of electrolyzers. This idea was proposed in \cite{Doctor_2004}, which investigated experimentally with the prospect of high-temperature steam being provided by an advanced nuclear cycle.