The Journal of The Electrochemical Society is publishing a focus issue on advanced electrolysis for renewable energy storage. The utilization of renewable energy has substantially driven more attention into electrolysis technologies. As renewable energy emerges and penetrates further into the energy market, the storage of surplus “off peak” electricity has received widespread considerations. An electrolyzer (ELX) can utilize “off peak” electricity from solar or wind farms to produce hydrogen or other fuels (e.g., ammonia, methanol, ethylene). These chemicals can subsequently be operated in a fuel cell mode to generate electricity or used as intermediates for other industrial applications. Compared to conventional batteries, the chemical storage of renewable energy has advantages of high energy density, long duration, and more flexibility. The covered technologies can include water electrolysis, CO2 conversion, NH3 synthesis, or other new electrolysis technologies. (more…)