AUTHOR=Ohtani Bunsho TITLE=Great Challenges in Catalysis and Photocatalysis JOURNAL=Frontiers in Chemistry VOLUME=5 YEAR=2017 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2017.00079 DOI=10.3389/fchem.2017.00079 ISSN=2296-2646