Electrocatalytic Study of Hydrogen Peroxide (H 2 O 2 ) synthesis by two-electron water oxidation reaction (2e-WOR) on BiVO4 photoanodes.

Radeya Vasquez^a, Camilo Mesa^a, Sixto Gimenez^a

^aUniversitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain

Materials for Sustainable Development Conference (MATSUS)
Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)

#Suschem- Materials and electrochemistry for sustainable fuels and chemicals

Barcelona, Spain, 2022 October 24th - 28th

Organizers: Marta Costa Figueiredo and Raffaella Buonsanti

Poster, Radeya Vasquez, 334
Publication date: 11th July 2022

The environmentally friendly oxidative activity of hydrogen peroxide (H₂O₂) and its numerous industrial applications (water treatment, chemical synthesis, etc) has raised plenty of interest due to its high oxidative potential and its fast reaction rate in comparison with other chemicals [1]. On-site (photo)electrochemical production of hydrogen peroxide is expected to sustainably settle energetic and safety concerns related to the current way to produce such a substance [1][2]. One electrochemical route to obtain H₂O₂ is by a controlled mechanism of water oxidation in which only 2 electrons are removed (2e-WOR).

Among several metallic oxides, BiVO4 has displayed the desired performance to produce hydrogen peroxide from water with a remarkable faradaic efficiency at a relatively low overpotential when working as either electro or photoelectrocatalyst under appropriate conditions [3].

In this poster we will present two different synthetic methods employed to obtain BiVO₄ films: Spin coating and electrodeposition, both followed by annealing. The activity is then studied through different techniques (LSV, CA) by measuring its faradaic efficiency (FE) at different potentials and periods, when the supporting electrolyte is KHCO₃ 0,5 M and 1M in a two-compartment cell. The amount of peroxide obtained is ex-situ quantified by a colorimetric method. The material thickness exhibits an inverse correlation with its FE which can be explained by a potential drop across the BiVO₄ film as long as light is not promoting the reaction. A gradually decreasing activity is measured when it is tracked through time attributed to an electrocatalyst mass loss under the working conditions. The highest FE observed is 17,5% with an average production rate of 3,01 µmol/min*cm² during the first 5 min of operation.

References:

[1] Siahrostami, S., Villegas, S., Bagherzadeh Mostaghimi, A., Back, S., Farimani, A., & Wang, H. et al. (2020). A Review on Challenges and Successes in Atomic-Scale Design of Catalysts for Electrochemical Synthesis of Hydrogen Peroxide. ACS Catalysis, 10(14), 7495-7511

[2] Shi, X., Back, S., Gill, T., Siahrostami, S., & Zheng, X. (2021). Electrochemical Synthesis of H2O2 by Two-Electron Water Oxidation Reaction. Chem, 7(1), 38-63

[3] Shi, X., Siahrostami, S., Li, G., Zhang, Y., Chakthranont, P., & Studt, F. et al. (2017). Understanding activity trends in electrochemical water oxidation to form hydrogen peroxide. Nature Communications, 8(1)

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