Synergistic crystal facet engineering and structural control of WO3 films exhibiting unprecedented photoelectrochemical performance

Highlights
• WO3 nanoplate arrays with enriched (200) and (002) facets were prepared.
• A remarkably high photocurrent density of 3.7 mA cm–2 at 1.23 V vs. RHE under AM 1.5 G illumination was achieved.
• Synergistic crystal facet engineering and structural control are critical for designing efficient PEC water splitting system.