A durable VO₂ transition layer and defect inactivation in BiVO₄via spontaneous valence-charge control

Abstract

The performance of bismuth vanadate (BiVO4) photoanodes is limited by surface defects and photo-corrosion instabilities. This paper proposes a revolutionary protection layer that overcomes these problems. Considering the role of...

Tailoring the surface termination of BiVO4 photoanodes using ammonium metavanadate enhances the solar water oxidation performance

“…We note that, unlike in these samples, previous reports dealing with surface V-rich BiVO4 are coated by a noticeable few-nm-thick VOx layer. 25,26 To investigate how the NH4VO3 treatment affects the chemical state of the surface elements, the highresolution XPS spectra of Bi 4f, V 2p and O 1s were collected for pristine and NH4VO3-modified BiVO4 films (Figure 2). Firstly, for the Bi 4f, core-level XPS spectra portray two symmetrical bands corresponding to the Bi 4f5/2 and Bi 4f7/2 doublet, 27 exhibiting in all cases a spin-orbit splitting value of 5.3 eV.…”

Photoassisted Water Purification through an Electrochemically Artificially Adjusted p-Cu2O Light Absorption Layer

“…The world faces significant environmental issues, such as water pollution, − due to rapid urbanization and industrialization. A diverse range of refractory organic pollutants present in wastewater and surface water, including persistent organic pollutants (POPs), pharmaceutical and personal care products (PPCPs), and endocrine disruptors, − pose direct or indirect risks to human health because of their considerable stability and toxicity. , Hence, employing proficient techniques to eradicate these contaminants from aquatic ecosystems is important. − To achieve this, various techniques, including flocculation, adsorption, filtering, and biodegradation, are employed …”

“… 7 , 8 Hence, employing proficient techniques to eradicate these contaminants from aquatic ecosystems is important. 9 − 11 To achieve this, various techniques, including flocculation, adsorption, filtering, and biodegradation, are employed. 12 …”

Tailoring the Surface Termination of BiVO4 Photoanodes Using Ammonium Metavanadate Enhances the Solar Water Oxidation Performance

“…We note that, unlike in these samples, previous reports dealing with surface V-rich BiVO 4 are coated by a noticeable few-nm-thick VO x layer. 27,28 We note that the annealing treatment was extended up to 24 h, but still no distinct VO x layer was detected using HR-TEM or EDX line scanning (Figures S5−S7). Likewise, Raman spectra remained virtually unchanged, supporting the notion that no VO x layer was formed (Figure S9).…”