Sonochemical regulation of oxygen vacancies for Bi₂WO₆ nanosheet-based photoanodes to promote photoelectrochemical performance

Abstract

Integration of oxygen vacancies (Vo) into nanostructured semiconductor-based photocatalysts has been recognized as a promising strategy for enhancing the performance of photoelectrochemical (PEC) water splitting. However, precisely controlling the Vo...

Recent advances in photoelectrochemical hydrogen production using I–III–VI quantum dots

“…Within this context, photoelectrochemical (PEC) water splitting is emerging as an efficient, economical, and clean approach to harness solar energy for hydrogen production through water electrolysis. 14–20 Furthermore, this method, integrating solar energy harvesting and water electrolysis in a single device, offers a simple and cost-effective device design, thus positioning it as a leading technology for next-generation energy systems.…”

Weak Force-Polarization-Driven Excellent Piezo-PEC Water Splitting by Coupling Dual-Active Piezoelectric Semiconductor with Defect Engineering in BiVO4/Bi2MoO6 Heterojunction

“…Nonetheless, the wide band gap confines the catalyst’s photoresponse to the ultraviolet segment of the solar spectrum, impeding the practical implementation of PEC technology. In pursuit of exceptional photoelectrodes, four categories of photocatalysts have emerged, encompassing metal-containing semiconductors, metal-free semiconductors, plasma metals, and insulators. − Over recent decades, extensive research has focused on the photoelectrocatalysis applications of bismuth-based semiconductor materials like Bi 2 O 3 , , BiOIO 3 , , and Bi 2 WO 6 . , Notably, BVO with its narrow band gap (2.4–2.5 eV) and deep valence band edge, alongside BMO with a suitable band gap (2.5–2.8 eV), exhibits the capability of PEC water oxidation under visible light, making them promising materials for PEC water splitting. − The unique aurivillius structure of BMO, composed of alternating layers of [MoO 2 ] 2+ and [Bi 2 O 2 ] 2+ , enables piezoelectric applications. Similarly, the effective carrier transport pathway provided by the chemically bonded layer stack structure of monoclinic scheelite BiVO 4 (BVO, s-m) is noteworthy.…”

“…7−9 Over recent decades, extensive research has focused on the photoelectrocatalysis applications of bismuthbased semiconductor materials like Bi 2 O 3 , 10,11 BiOIO 3 , 12,13 and Bi 2 WO 6 . 14,15 Notably, BVO with its narrow band gap (2.4−2.5 eV) and deep valence band edge, alongside BMO with a suitable band gap (2.5−2.8 eV), exhibits the capability of PEC water oxidation under visible light, making them promising materials for PEC water splitting. 16−20 The unique aurivillius structure of BMO, composed of alternating layers of [MoO 2 ] 2+ and [Bi 2 O 2 ] 2+ , enables piezoelectric applications.…”