Thermoelectrocatalytic H₂O₂ production via dual redox of O₂ and H₂O on La-substituted SrTiO₃

Abstract

The conversion of low-grade waste heat into valuable chemicals is a promising route toward energy conservation and carbon neutrality. Herein, we demonstrate that La-substituted SrTiO₃ serves as an efficient thermoelectrocatalytic material for the simultaneous H₂O₂ production via H₂O oxidation and O₂ reduction. Under a mild temperature gradient of 130 °C, the system achieves a notable H₂O₂ production rate of 412 μmol·L⁻¹·g⁻¹·h⁻¹. This work offers a potential strategy for sustainable chemical synthesis by utilizing ubiquitous low-grade thermal energy.

Graphical abstract

Keywords

thermoeletrocatalysis / hydrogen peroxide / dual redox pathways / La-doped SrTiO₃

References

[1] Snyder G J, Toberer E S . Complex thermoelectric materials.Nature Materials, 2008, 7(2): 105–114

[2] Zhang X, Zhao L D . Thermoelectric materials: energy conversion between heat and electricity.Journal of Materiomics, 2015, 1(2): 92–105

[3] Bell L E . Cooling, heating, generating power, and recovering waste heat with thermoelectric systems.Science, 2008, 321(5895): 1457–1461

[4] Wu J Q, Chen K, Reece M J, et al. Porous thermoelectric materials for energy conversion by thermoelectrocatalysis.Energy Technology, 2024, 12(10): 2400973

[5] Lin Y J, Khan I, Saha S, et al. Thermocatalytic hydrogen peroxide generation and environmental disinfection by Bi₂Te₃ nanoplates.Nature Communications, 2021, 12(1): 180

[6] Yoon J, Jang H, Oh M W, et al. Heat-fueled enzymatic cascade for selective oxyfunctionalization of hydrocarbons.Nature Communications, 2022, 13(1): 3741

[7] Li C L, Zhang X M, Pei J, et al. Utilizing waste heat to drive selective green organic conversion through a thermoelectrocatalytic process.Small Methods, 2025, 9(9): e00956

[8] Li C, Li S, Zhao L, et al. Bi₂Te₃/carbon nanotube hybrid nanomaterials as catalysts for thermoelectric hydrogen peroxide generation.Molecules, 2024, 29(22): 5242

[9] Zhang Y, Li S, Zhang J, et al. Thermoelectrocatalysis: an emerging strategy for converting waste heat into chemical energy.National Science Review, 2024, 11(4): nwae036

[10] He J, Tritt T M . Advances in thermoelectric materials research: looking back and moving forward.Science, 2017, 357(6358): eaak9997

[11] Yang Q, Gu Y H, Liu Y C, et al. Efficient H₂O₂ production from a SrTiO₃-based thermoelectrocatalyst for harvesting low-grade waste heat.Chemical Communications, 2024, 60(92): 13554–13557

[12] Zhang Y Q, Sugo K, Cho H J, et al. Thermoelectric phase diagram of the SrTiO₃–LaTiO₃ solid-solution system through a metal to Mott insulator transition.Journal of Applied Physics, 2019, 126(7): 075104

[13] Choi M, Posadas A B, Rodriguez C A, et al. Structural, optical, and electrical properties of strained La-doped SrTiO₃ films.Journal of Applied Physics, 2014, 116(4): 043705

[14] Eom K, Chung B, Oh S, et al. Surface triggered stabilization of metastable charge-ordered phase in SrTiO₃.Nature Communications, 2024, 15(1): 1180

[15] Baki A, Abdeldayem M, Morales C, et al. Potential of La-doped SrTiO₃ thin films grown by metal–organic vapor phase epitaxy for thermoelectric applications.Crystal Growth & Design, 2023, 23(4): 2522–2530

[16] Zhang Y Q, Cho H J, Sugo K, et al. Low thermal conductivity of SrTiO₃–LaTiO₃ and SrTiO₃–SrNbO₃ thermoelectric oxide solid solutions.Journal of the American Ceramic Society, 2021, 104(8): 4075–4085

[17] Nesbitt H W, Legrand D, Bancroft G M . Interpretation of Ni 2p XPS spectra of Ni conductors and Ni insulators.Physics and Chemistry of Minerals, 2000, 27(5): 357–366

[18] Low J X, Dai B Z, Tong T, et al. In situ irradiated X-ray photoelectron spectroscopy investigation on a direct Z-scheme TiO₂/CdS composite film photocatalyst.Advanced Materials, 2019, 31(6): 1802981

[19] Ekren D, Cao J, Azough F, et al. Controlling the thermoelectric behavior of La-doped SrTiO₃ through processing and addition of graphene oxide.ACS Applied Materials & Interfaces, 2022, 14(48): 53711–53723

[20] Muta H, Kurosaki K, Yamanaka S . Thermoelectric properties of reduced and La-doped single-crystalline SrTiO₃.Journal of Alloys and Compounds, 2005, 392(1−2): 306–309

[21] Ahmed A J, Hossain M S A, Islam S M K N, et al. Significant improvement in electrical conductivity and figure of merit of nanoarchitectured porous SrTiO₃ by La doping optimization.ACS Applied Materials & Interfaces, 2020, 12(25): 28057–28064

[22] Berbille A, Li X F, Su Y S, et al. Mechanism for generating H₂O₂ at water–solid interface by contact-electrification.Advanced Materials, 2023, 35(46): 2304387

[23] Zhang X Y, Wan Y Y, Wen Y, et al. SnSe nanosheets with Sn vacancies catalyse H₂O₂ production from water and oxygen at ambient conditions.Nature Catalysis, 2025, 8(5): 465–475

[24] Dong K, Liang J, Wang Y, et al. Conductive two-dimensional magnesium metal–organic frameworks for high-efficiency O₂ electroreduction to H₂O₂.ACS Catalysis, 2022, 12(10): 6092–6099

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