The non-stoichiometric tungsten oxide nanostructure, WO2.9 (W25O73, dark blue color) is an efficient electrocatalyst for hydrogen evolution in acidic water, which has shown promise as an alternative to platinum (Nature Communications 2015, 6, 8064(1-7)). Generally speaking, the oxygen vacancies or oxygen deficiencies can affect the electronic band structure and enhance the conductivity. Blue tungsten oxide-based materials, WO2.8 (W5O14) are used as promising anode materials for lithium-ion batteries (Adv. Funct. Mater. 2018, 28, 1707500). And sea urchin-like WO2.7 (W18O49, purple color) nanowire can be used as a substrate material to magnify the substrate-analyte molecule interaction, leading to significant SERS response, even comparable to noble metals without ‘hot spots’. The extremely high electrocatalytic activity and SERS response can probably be attributed to the presence of oxygen deficiencies, either intrinsic or on the surface (Nature Communications 2015, 6, 7800(1-7)). Read M...
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