Hydrogen, energy conversion 4-electron reduction process

The principles of redox catalysis applied successfully here to photodecomposition of water, can also be profitably employed to carry out efficiently other multi-electron reactions. Of special interest in the area of solar energy conversion are processes such as reduction of C02, N2 and NAD+ and oxidation of halide ions (Cl-, Br- or I-). With the latter, there exists the interesting possibility of complete decomposition of hydrogen halides with the reverse reaction used in a fuel cell to generate power. 

---