AUTHOR=Roy Soumyajit , Crans Debbie C. , Parac-Vogt Tatjana N. TITLE=Editorial: Polyoxometalates in Catalysis, Biology, Energy and Materials Science JOURNAL=Frontiers in Chemistry VOLUME=7 YEAR=2019 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00646 DOI=10.3389/fchem.2019.00646 ISSN=2296-2646