A Novel Electrode for Value-Generating Anode Reactions in Water Electrolyzers at Industrial Current Densities

Hydrogen generated in electrolyzers is discussed as a key element in future energy scenarios, but oxygen evolution as the standard anode reaction is a complex multi-step reaction requiring a high overpotential. At the same time,it does not add value-the oxygen is typically released into the atmosphere. Alternative anode reactions which can proceed at similar current densities as the hydrogen evolution are, therefore, of highest interest. We have discovered a high-performance electrode based on earth-abundant elements synthesized in the presence of H2O2, which is able to sustain current densities of close to 1 A cm(-2) for the oxidation of many organic molecules, which are partly needed at high production volumes. Such anode reactions could generate additional revenue streams, which help to solve one of the most important problems in the transition to renewable energy systems, i.e. the cost of hydrogen electrolysis.

Automated summary

This study discusses the importance of hydrogen generated in electrolyzers for future energy scenarios. The standard anode reaction, oxygen evolution, is complex and requires high overpotential. The researchers have discovered a high-performance electrode based on earth-abundant elements, which can oxidize organic molecules at high current densities, providing a solution to the cost issue of hydrogen electrolysis and generating additional revenue.