Roadmap on nanomaterials and processes for renewable energy devices—state of the art and challenges

The roadmap focusses on the current state of the art of three key reactions for sustainable energy transformation, water electrolysis for hydrogen production, carbon dioxide reduction for electrofuel production, and nitrogen reduction for ammonia production. Each technique is covered in separate chapters as detailed in the outline below. Each chapter is meant to update the reader in a short and concise way about the current state-of the art, the most significant challenges, and the trends and ideas lying ahead as solutions. We foresee a road map paper which will be of high interest for readers involved in current green technologies.