About: http://webisa.webdatacommons.org/408771446

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Subsequently, mostly in Europe, there has been extensive research into porous thin-film electrodes of oxide semiconductors that can use visible light (e.g. tungsten oxide (WO3) and iron oxide (Fe2O3)).
http://www.w3.org/ns/prov#wasQuotedFrom	fuelcellsworks.com