Abstract
Despite the growing demand for hydrogen peroxide it is almost exclusively manufactured by the energy-intensive anthraquinone process. Alternatively, H2O2 can be produced electrochemically via the two-electron oxygen reduction reaction, although the performance of the state-of-the-art electrocatalysts is insufficient to meet the demands for industrialization. Interestingly, guided by first-principles calculations, we found that the catalytic properties of the Co–N4 moiety can be tailored by fine-tuning its surrounding atomic configuration to resemble the structure-dependent catalytic properties of metalloenzymes. Using this principle, we designed and synthesized a single-atom electrocatalyst that comprises an optimized Co–N4 moiety incorporated in nitrogen-doped graphene for H2O2 production and exhibits a kinetic current density of 2.8 mA cm−2 (at 0.65 V versus the reversible hydrogen electrode) and a mass activity of 155 A g−1 (at 0.65 V versus the reversible hydrogen electrode) with negligible activity loss over 110 hours.
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Acknowledgements
Synthesis and physicochemical property analysis of the catalysts were supported by the Research Center Program of the IBS (IBS-R006-D1) in Korea (T.H.). Electrochemical analysis was supported by Research Center Program of the IBS (IBS-R006-A2, Y.-E.S.). X-ray absorption spectra characterization at the Pohang Accelerator Laboratory (PAL) 8C beamline was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (no. 2018M1A2A2061998). Theoretical analysis was supported by the 2019 Research Fund of the University of Seoul (J.S.Y.).
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E.J., H.S., B.-H.L., J.S.Y., Y.-E.S. and T.H. conceived the research. E.J., H.S. and B.-H.L. designed the experiments. E.J., B.-H.L., H.S.L., J.K. and W.H.A. performed and analysed the results. H.S. and S.P. performed electrochemical measurements. V.E., S.L. and J.S.Y. performed the computational analysis. S.-P.C. conducted the high-angle annular dark-field scanning transmission electron microscopy analysis. K.-S.L. contributed to the X-ray absorption experiments and analysis. E.J., H.S., B.-H.L., J.S.Y., Y.-E.S. and T.H. wrote the manuscript. J.S.Y., Y.-E.S. and T.H. supervised the project. All the authors commented on the manuscript.
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Supplementary Notes, Figs. 1–41, Tables 1–4 and references 1–18.
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Jung, E., Shin, H., Lee, BH. et al. Atomic-level tuning of Co–N–C catalyst for high-performance electrochemical H2O2 production. Nat. Mater. 19, 436–442 (2020). https://doi.org/10.1038/s41563-019-0571-5
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DOI: https://doi.org/10.1038/s41563-019-0571-5