Hydrogen has a long standing history as a feedstock gas or process medium in industrial applications, whenever small to medium flows are required, and often the technology of choice when high purity streams are needed. Currently there is an increased demand for electrochemical hydrogen because it gives an answer to the growing practical issues related to the integration of renewable energies in today's energy mix. In the power-to-gas concept [1], that provides a realistic route for a carbon-free economic future, water electrolysis is the key technology to store renewable energy surpluses, allowing the crossover between different energy vectors; electricity on the grid, natural gas as chemical energy storage and fuel for transport applications.
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