Raw data and corresponding data analysis (Microsoft Office Excel, Origin) supporting Journal of American Chemical Society publication: "Reversible and Selective Interconversion of Hydrogen and Carbon Dioxide into Formate by a Semiartificial Formate Hydrogenlyase Mimic". Data include: three-electrode and two-electrode electrochemistry and electrolysis, colloidal particle system experiments (with indium tin oxide nanoparticles, cytochrome c, denatured enzymes), data analysis and product quantification.