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NaNO3-mediated synthesis of Pt-doped titanate perovskites for oxygen-reduction reactions in acidic media

  • Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications
  • Published:
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Abstract

Platinum (Pt) has been used in a wide range of catalytic applications such as oxygen-reduction reaction (ORR) in fuel cells. Key requirements for the applications are high dispersion and good anchorage of Pt nanoparticles on support materials. Metal ex-solution on perovskite oxide has been considered as a highly promising way to meet these demands, but Pt is extremely difficult to incorporate perovskite lattices due to its thermal unstability (oxygen loss). Here, we introduce a facile synthesis method mediated by NaNO3 to prepare Pt-doped CaTiO3. Use of amorphous TiO2 allows the particles to obtain spherical morphology (300 nm) and the high surface area (16 m2 g−1). The Pt ex-solved on CaTiO3 upon reducing atmosphere exhibit comparable catalytic activities for ORR in acidic media to conventional Pt/C catalysts. With good stability of titanate perovskites to acidic conditions, it would be highly applicable to various catalytic applications in redox environments.

Graphical Abstract

Highlights

  • Synthesis of Pt-doped CaTiO3 through a NaNO3-mediated fusion method.

  • Pt ions incorporated in the B-sites of the perovskite-structured CaTiO3.

  • Pt nanoparticles ex-solved from the perovskite-structured CaTiO3 upon reduction.

  • Compatible activity of 1 mol% Pt-ex-solved CaTiO3 catalysts to a commercial 40 wt.% Pt/C for oxygen-reduction reactions in acidic media.

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Data availability

The data and materials of this study are available from the corresponding author, [JGL], upon reasonable request.

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Acknowledgements

This work was supported by National Research Foundation of Korea (NRF) grant funded by Korean government (MSIT) (No. 2021R1A2C2092130).

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Authors and Affiliations

  1. Advanced Energy Materials and Components R&D Group, Dongnam Division, Korea Institute of Industrial Technolo-gy, 33-1, Jungang-ro, Yangsan, Gyeongsangnam-do, 50623, Republic of Korea

    Jin Goo Lee

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  1. Jin Goo Lee
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Contributions

JGL outlined the research and conducted the experiments. JGL prepared the samples and analyzed materials characteristics. JGL wrote the manuscript and all authors have given approval to the final version of the manuscript.

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Correspondence to Jin Goo Lee.

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Lee, J.G. NaNO3-mediated synthesis of Pt-doped titanate perovskites for oxygen-reduction reactions in acidic media. J Sol-Gel Sci Technol 108, 120–126 (2023). https://doi.org/10.1007/s10971-023-06188-6

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  • DOI: https://doi.org/10.1007/s10971-023-06188-6

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