A surface reconstruction route for increasingly improved photocatalytic H 2 O 2 production using Sr 2 Bi 3 Ta 2 O 11 Cl.

Autor: Banoo M; Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER)-Mohali Sector 81, Mohali, S.A.S. Nagar Punjab 140306 India ujjalgautam@iisermohali.ac.in ujjalgautam@gmail.com., Sah AK; Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER)-Mohali Sector 81, Mohali, S.A.S. Nagar Punjab 140306 India ujjalgautam@iisermohali.ac.in ujjalgautam@gmail.com., Roy RS; Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER)-Mohali Sector 81, Mohali, S.A.S. Nagar Punjab 140306 India ujjalgautam@iisermohali.ac.in ujjalgautam@gmail.com., Kaur K; Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER)-Mohali Sector 81, Mohali, S.A.S. Nagar Punjab 140306 India ujjalgautam@iisermohali.ac.in ujjalgautam@gmail.com., Kommula B; Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER)-Mohali Sector 81, Mohali, S.A.S. Nagar Punjab 140306 India ujjalgautam@iisermohali.ac.in ujjalgautam@gmail.com., Sanyal D; Variable Energy Cyclotron Centre 1/AF Bidhannagar Kolkata 700064 India.; Homi Bhabha National Institute Anushakti Nagar Mumbai 400094 India., Gautam UK; Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER)-Mohali Sector 81, Mohali, S.A.S. Nagar Punjab 140306 India ujjalgautam@iisermohali.ac.in ujjalgautam@gmail.com.
Jazyk: angličtina
Zdroj: Chemical science [Chem Sci] 2024 Sep 18. Date of Electronic Publication: 2024 Sep 18.
DOI: 10.1039/d4sc04866k
Abstrakt: Photocatalytic hydrogen peroxide (H 2 O 2 ) generation is attractive for the chemical industry and energy production. However, photocatalysts generally deteriorate significantly during use to limit their application. Here we present highly active Sr 2 Bi 3 Ta 2 O 11 Cl single-crystal nanoplates for conversion of O 2 to H 2 O 2 using ambient air with a production rate of ∼3 mmol h -1 g -1 (maximum 17.5% photon conversion). Importantly, Sr 2 Bi 3 Ta 2 O 11 Cl is not only stable during 30 days of H 2 O 2 production but also gets consistently activated to increase the H 2 O 2 yield by >244%, unlike any other catalyst for H 2 O 2 production. Multi-pronged characterization confirms that the synergistic increase in activity originates from in situ surface reconstruction by oxygen-deficient vacancy associate formation that improves (i) surface oxygen adsorption, (ii) sunlight harvesting, and (iii) charge-transfer from the low-valent metal atoms surrounding oxygen vacancies to reactants. The study establishes the prospects of rational defect engineering for realizing non-degrading photocatalysts for realistic H 2 O 2 production.
Competing Interests: The authors declare no conflict of interest.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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