Atom trapping of scarce precious metals onto a suitable support at high temperatures has emerged as an effective approach to build thermally stable single-atom catalysts. Here, following a similar mechanism based on atom trapping through support effects, we demonstrate a reverse atom-trapping strategy to controllably extract strontium atoms from a rigid lanthanum strontium cobalt ferrite ((La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ, LSCF) surface with ease. The lattice oxygen redox activity of LSCF is accordingly fine-tuned, leading to enhanced cathode performance in a solid-oxide fuel cell. An over 30−70% increases in maximum power density of the single cells at intermediate temperatures is achieved by LSCF with surface strontium vacancies compared to the pristine surface. In addition, the strontium-deficient surface excludes strontium segregation and formation of electrochemically inert SrO islands, thus improving the longevity of the cathode. This development can be broadly applicable for modifying structurally stable oxide surfaces, and opens more possibilities of scalable single-atom extraction strategies.
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Atomic coordinates of the optimized computational models are provided as Supplementary Data 1 with this paper. Other data that support the findings of this study can be found in the article and the Supplementary Information; this information is also available from the corresponding author upon request.
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This work was supported by the National Key R&D Program of China (2018YFA0702003 to Y.D.L.), the National Natural Science Foundation of China (21890383 to Y.D.L., 21871159 and 22171157 to D.W., and 52002249 to Y.H.L.), the Beijing Natural Science Foundation (2214061 to Z.Z.), the Science and Technology Key Project of Guangdong Province of China (2020B010188002 to D.W.), the Guangdong Basic and Applied Basic Research Foundation (2019A1515110025 to Y.H.L.), the Fundamental Research Funds for the Central Universities (WUT: 2019III012GX and 2020III002GX to J.S.W.), and the China Postdoctoral Science Foundation (2019M660607 to Z.Z.). The S/TEM work was performed at the Nanostructure Research Center (NRC), which is supported by the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, and the State Key Laboratory of Silicate Materials for Architectures (all of the laboratories are at Wuhan University of Technology). We thank the 1W1B and 4B9B beamlines of Beijing Synchrotron Radiation Facility (BSRF) and the BL14W1 beamline of Shanghai Synchrotron Radiation Facility (SSRF) for providing beam time to support this project. We also thank L. Zheng of Institute of High Energy Physics, Chinese Academy of Sciences and K. Cao of ShanghaiTech University for providing insightful discussions. Z.Z. acknowledges support from the Shuimu Tsinghua Scholar Program.
The authors declare no competing interests.
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Zhuang, Z., Li, Y., Yu, R. et al. Reversely trapping atoms from a perovskite surface for high-performance and durable fuel cell cathodes. Nat Catal 5, 300–310 (2022). https://doi.org/10.1038/s41929-022-00764-9
Nano Research (2022)